The mitochondrial gene orfH79 plays a critical role in impairing both male gametophyte development and root growth in CMS-Honglian rice
© Peng et al; licensee BioMed Central Ltd. 2010
Received: 12 November 2009
Accepted: 24 June 2010
Published: 24 June 2010
Cytoplasmic male sterility (CMS) has often been associated with abnormal mitochondrial open reading frames. The mitochondrial gene orfH79 is a candidate gene for causing the CMS trait in CMS-Honglian (CMS-HL) rice. However, whether the orfH79 expression can actually induce CMS in rice remains unclear.
Western blot analysis revealed that the ORFH79 protein is mainly present in mitochondria of CMS-HL rice and is absent in the fertile line. To investigate the function of ORFH79 protein in mitochondria, this gene was fused to a mitochondrial transit peptide sequence and used to transform wild type rice, where its expression induced the gametophytic male sterile phenotype. In addition, excessive accumulation of reactive oxygen species (ROS) in the microspore, a reduced ATP/ADP ratio, decreased mitochondrial membrane potential and a lower respiration rate in the transgenic plants were found to be similar to those in CMS-HL rice. Moreover, retarded growth of primary and lateral roots accompanied by abnormal accumulation of ROS in the root tip was observed in both transgenic rice and CMS-HL rice (YTA).
These results suggest that the expression of orfH79 in mitochondria impairs mitochondrial function, which affects the development of both male gametophytes and the roots of CMS-HL rice.
Maternally inherited cytoplasmic male sterility (CMS) has been described in over 150 plant species [1, 2]. In most cases, the failure of pollen development in a CMS background is suggested to be associated with chimeric open reading frames (ORFs) that have arisen from unusual recombination events in mitochondria . The CMS-Honglian (CMS-HL) line of rice (Oryza sativa) was developed by the repeated backcrossing of a red-awned wild rice (O. rufipogon) from Hainan Island of China with an early-maturing indica variety called Lian-Tang-Zao. The line is distinct both genetically and cytologically from CMS-Boro (CMS-BT) rice and CMS-Wild abortive (CMS-WA) rice . Hybrid rice varieties based on CMS-HL have been widely grown in China since the beginning of this century because it performs better agronomically and produces better quality grain than those varieties based on other CMS systems. In CMS-HL rice, a chimeric mitochondrial gene called orfH79, located downstream of atp6, has been proposed as the candidate gene causing the CMS trait of Honglian rice . However, no direct evidence shows that the chimeric orfH79 is responsible for the CMS in Honglian rice.
The mitochondrial genome carries important genetic information for a number of eukaryotic functions, including energy metabolism, development, programmed cell death and responses to oxidative stress . In plants, the mitochondrial metabolism is usually disturbed by high levels of reactive oxygen species (ROS), generated in response to a range of biotic and abiotic stressors [7–9]. ROS have already emerged as an important regulator of plant development, and increasing evidence indicates that they also play a role in cell growth, since their spatial distribution affects the morphological development of plants . We have previously shown that an excessive level of ROS was found during microsporogenesis in CMS-HL rice. Furthermore, the depletion of ATP and NADH and the degradation of mitochondrial genomic DNA were observed in CMS-HL rice [11, 12]. However, the initial trigger of the oxidative stress response remains to be determined.
In this paper, we investigated the localization of the OrfH79 gene product and found that the protein is mainly present in the mitochondria of CMS-HL rice. Thus, the orfH79 gene was fused to a mitochondrial targeting sequence and used to transformed a Honglian maintainer line. The result showed that import of this protein into mitochondria induced cytoplasmic male sterility and reduced root growth. In addition, the expression of the transgene was also associated with excessive accumulation of ROS, a declined cellular ATP/ADP ratio, a reduced mitochondria membrane potential and a lower oxygen consumption rate. Interestingly, similar phenotypes were also observed in the YtA line. These results indicate that orfH79 impairs mitochondrial function, which appears to disturb the development of both male gametophytes and the roots of CMS-HL rice.
The orfH79product is present in the mitochondria of the YtA line
Expression patterns of ORFH79 in anther and root tip of YtA line
A chimeric orfH79transgene induces CMS
Segregation of the T1 transgenic plant with orfH7 9
Number of positive plant
Number of negative plants
χ2value (for 1:1 segregation)
Molecular evidence of the expression of ORFH79 in the transgenic plants
To provide further molecular evidence that ORFH79 can cause the male sterility phenotype in the transgenic lines, expression of the transgene at the protein level was assayed by western blot. The mitochondria-enriched protein fraction was extracted from the callus that had been derived from the transgenic lines (U6-2, U6-3, U3-2) and probed with anti-ORFH79 antibody. An 11 KD band similar to that observed in YtA was detected in the transgenic callus, but not in the shijing B callus (Fig. 3C). This confirmed that the transit peptide fused to ORFH79 was properly processed and that ORFH79 was imported into mitochondria in these transgenic lines. The results provided direct molecular evidence demonstrating that the presence of ORFH79 in mitochondria corresponds to the male sterile phenotype of CMS-HL rice.
Mitochondria activity assay in YtA line and transgenic plants expressing ORFH79
Taken together, these physiological features in the transgenic lines mimic those in the YtA line, this provided another evidence that orfH79 is responsible for the CMS trait of YtA. Furthermore, these data showed that the mitochondrial activity both in YtA line and transgenic plants are down-regulated, suggesting that accumulation of ORFH79 in mitochondria impairs their normal function.
The transgenic expression of orfH79retards root growth
Excessive ROS levels in the roots of both transgenic plants and the YtA line contribute to retardation of root growth
Previous research has shown that ROS plays an important role in plant root development  and we have found excessive ROS in the microspore of the orfH79 transgenic plants. Thus, we analyzed the production of ROS in the root tips of transgenic plants using the oxidant-sensitive H2DCFDA. The intensity of H2DCFDA fluorescence in the transgenic plant root tip was observed to be higher than that in the wild type (Fig. 6C-a, c and 6D). Furthermore, the appearance of root hair was observed to be delayed in transgenic plants compared with wild-type plants (Fig. 6e, f, g, h).
To address the question as to whether the root growth inhibition observed in YtA was brought about by a higher level of oxidative stress, the effect of adding the ROS scavenger Vitamin C to the culture solution was explored. Interestingly, the inhibition of YtA root growth was observed to be rescued when 100 nM Vitamin C was supplemented in the solution (Fig. 7C, D). Taken together, these results imply that root growth retardation in the YtA line is associated with the excessive ROS content.
orfH79is responsible for the gametophytic male sterility of CMS-HL
CMS is a widespread phenomenon in plants, and is often associated with abnormal mitochondrial ORFs. Although orfH79 was proposed as a candidate gene corresponding to the male sterility of CMS-HL rice, direct evidence for this was lacking. Our experiments showed that the transgenic expression of OrfH79 induces the abortion of about 50% of the pollens, indicating only the pollens carrying expressed orfH79 were disrupted, and pollen abortion occurs after meiosis. This is a typical feature of gametophytic male sterility in plants and this feature is associated with the segregation of the transgene in the T1 progeny. Furthermore, the physiological features of the transgenic lines expressing orfH79, including reduced ATP/ADP ratio, high ROS content, decreased mitochondrial membrane potential and lower respiration rate mimic all features of the HL-CMS line (YtA). Therefore, we believe that orfH79 is responsible for the gametophytic male sterility of CMS-HL rice.
In CMS Boro rice, orf79, which is probably allelic to orfH79, has been identified as the gene responsible for male sterility . orfH79 and orf79 share 98% identity with one another at the nucleotide level. Only 5 nt differ, but each of these differences results in a distinctly different codon. However, both the appearance of the aborted pollen and the timing of pollen abortion differ markedly between these two CMS types. In CMS-BT rice, pollen abortion occurs at the tri-nucleate stage and is stainable with 1% I2-KI solution, revealing spherical, black pollen grains. While in CMS-HL rice, pollen aborts at the di-nucleate stage and is not stainable with 1% I2-KI solution, revealing spherical, blank pollen grains (Additional file 3). The mechanisms by such similar genes can cause such divergent phenotypes remain to be determined.
Similarly to the CMS associated proteins such as URF13 in CMS-T maize  and ORF129 in CMS wild beet , ORFH79 was observed to accumulate mainly in the mitochondria in both vegetative and reproductive tissues. At the same time, the accumulation of high levels of ROS, a significantly decreased adenylate content as well as ATP/ADP ratio, reduced mitochondrial membrane potential and a lower oxygen consumption rate were found both in the YtA line and in the transgenic plant in which ORFH79 was imported into mitochondria. Thus, the results provided here demonstrated that accumulation of ORFH79 in mitochondria impairs the mitochondrial function. In fact, dysfunctional mitochondria distribute throughout the plant but only the pollen function is lost, suggesting that the mitochondrial activity is strictly required for gametophyte development during microsporogenesis. This idea is in agreement with the hypothesis that the abnormal mitochondria in the CMS line cannot meet the increasing demand for energy during microsporogenesis [15, 16]. However, how the aberrant ORFH79 protein affects mitochondrial function remains a subject for further investigation.
Retarded root growth is associated with excessive ROS caused by expression of orfH79
In previous studies, significant attentions have been focused on reproductive development in the study of CMS. Detailed studies on vegetative development have not been performed, especially on roots growing underground. However, in the CMS lines of Brassica napus and Nicotiana tabacum, all tissues except for green leaves showed lower ATP levels than their respective maintainer lines. This reduced energy availability had limiting effects on plant growth [17, 18]. Nevertheless, reduced plant height and retarded vegetative growth were also reported in other CMS systems such as B. juncea , N. tabacum cybrids , and T. aestivum .Although some differences in alloplasmic lines have been observed, retarded root growth and reports of chimeric ORF expression associated with the retardation of vegetative growth in CMS plants have not been described until now. In our transgenic experiments, transgenic plants with orfH79 under the control of a constitutive promoter (Pubi) showed retarded root growth similar to the YtA line. However, the root development of the transgenic plants with orfH79 under the control of a pollen specific promoter was indistinguishable from that of the wild type, despite the fact that the transgenic plants also revealed an aborted pollen phenotype (data not shown). Therefore the products of such a CMS-associated ORF may disturb not only to the gametophyte development but also root growth.
ROS play important physiological roles in plants, especially in signalling cell division and expansion, root growth and root hair development [22, 23]. However, excessive levels of ROS produce oxidative stress and inhibit plant root growth, as shown in the case for the inhibition of Arabidopsis thaliana root tip elongation, which was inhibited by exogenously applied hydrogen peroxide . In the pea root, high levels of exogenous aluminum ions trigger excessive amounts of ROS production, leading to respiration inhibition, ATP depletion and the inhibition of root elongation . A similar effect has also been reported in rice roots: lead toxicity stunted rice root growth via abnormal ROS production . In our studies, an excessive amount of ROS production was found both in the roots of YtA line and in transgenic plants. Moreover, the slow elongation of the primary root and lateral roots of YtA can be rescued by a known scavenge of excessive ROS, Vitamin C. Taken together, these results suggested that the excessive ROS content caused by the expression of orfH79 is responsible for the retarded root growth.
In summary, we found ORFH79 accumulated mainly in mitochondrial and imported the protein into mitochondria induced male sterile and retarding root growth. In addition, the expression of the transgene was also associated with declined cellular ATP levels, reduced mitochondria membrane potential, and excessive accumulated ROS content. Furthermore, similar phenotypes were also observed in YtA line. These results indicate that orfH79 impair the mitochondria function, which may disturb the development of both male gametophyte and root of CMS-HL rice.
A CMS-HL line, YuetaiA (YtA), and its maintainer line of YuetaiB (YtB, Indica) and ShijinB (SB, japonica) were used in this study. T0 progeny transgenic plants were grown at 25°C under 16 h of daylight in a greenhouse. For physiological analysis, plants were grown under a controlled temperature of 23°C and at 70% relative humidity.
Plasmid construction and rice transformation
The sequence of the gene coding for the mitochondrial transit peptide was derived from RFo (Genbank accession EF472240.1) . To enhance the expression of orfH79 in the nuclear genome of rice, the fusion between this transit peptide sequence and orfH79 was synthesized using rice-preferred genetic codons based on the Codon Usage Database that provided by Kazusa DNA Research Institute http://www.kazusa.or.jp/codon/. The fusion was synthesized by overlap extension PCR . Four long primers with 10 bp of overlap were synthesized and PCR reactions were carried out as described by : s1, 5'-atgaccaacctgctccgctggctcttctccaccacccgcggcaccaacggtctcccatactt catcttcg-3';s2, 3'aagtagaagccacagc accacccgcc gcgggacaaaagcgaaacgatc atagtcggggagacatg-5'; S3, 5'-cctctgtacgaccccgctctactggacaagatcatagat cataacataaaggccggctaccctatagagg-3'; S4, 3'-gatatctccacctgaaccccgtga gataagcacaccagaagggattcac T-5'. The synthetic gene was ligated to the OsPMP41  to form an intermediated construct designated pGUS1. This was then digested with HindIII and BamHI and ligated to a strong constitutive promoter Pubi (the maize ubiquitin promoter). The entire expression cassette (Pubi:: synthetic gene:: Nos) was digested with HindIII and EcoRI and ligated into a binary vector pCAMBIA1301, that had been digested with the same enzymes. The resulting constructs were designated pCON. The japonica rice variety ShijinB was transformed using Agrobacterium tumefaciens EHA-105, following the published procedures by Hiei et al. .
Preparation of proteins
Total protein was extracted from etiolated shoots, spikelets and anthers of YtA and YtB. Tissues were ground into a fine powder in liquid nitrogen. 400-500 mg of tissue were extracted in 1 ml of extraction buffer (66 mM Tris-Cl, pH 6.8, 2% SDS, 2% v/v 2-mercaptoethanol) at room temperature followed by centrifugation for 20 min at 40000 × g to remove the insoluble fraction. Proteins were precipitated at -20°C for 1 h by the addition of 1 ml of an 8:1 mixture of ice-cold acetone and trichloroacetic acid with 0.1% v/v 2-mercaptoethanol. The supernatant was discarded after centrifugation at 18000×g for 15 min at 4°C, and the pellet was washed in 1 ml of ice-cold acetone. The remaining acetone was removed by air drying at room temperature. The resulting pellet was redissolved in the protein extraction solution. Purified mitochondrial proteins were extracted from the same tissues and transgenic callus mitochondria as described by Wan et al. . The YtA line mitochondria protein were separated into soluble and insoluble fractions according to a method described by Uyttewaal et al. 
Antibodies and western blotting analysis
A polyclonal antibody against ORFH79 was obtained from a commercial service (Alpha Diagnostic International, San Antonio, Tex., USA) by injection of a synthetic peptide, comprising residues 37 to 55 of ORFH79 into rabbits. The specificity of the antiserum was tested by western blot the ORFH79 protein expressed in E. coli (Additional file 4). Equal amounts of protein from each fraction were separated by 18% SDS-PAGE gel at 4°C, and then transferred onto an Immobilon-PSQ transfer membrane (PVDF type; Millipore) at 80 V for 40 min. The membrane was incubated in 5% w/v non-fat milk, 0.05% v/v Tween-20, in phosphate buffered saline (PBS) for 1 h, washed for 10 min three times in PBST (PBS, 0.05% Tween-20), and incubated in a 1:500 dilution of rabbit antiserum overnight at 4°C. After four washes with PBST, the membrane was incubated with goat anti-rabbit IgG conjugated with alkaline phosphatase (AP) in PBST solution for 2 h. After four 10-min washes in PBST, signal was detected according to a method described by Yue et al . Briefly, the membrane was washed with AP 7.5 buffer (0.1 M Tris-HCl pH 7.5, 0.1 M NaCl, 2 mM MgCl2) twice, and once with AP 9.5 buffer (0.1 M Tris-HCl pH 9.5, 0.1 M NaCl, 50 mM MgCl2) for 10 min each. Then the membrane was incubated with 2.5 mg nitroblue tetrazolium (NBT; Promega) and 1.25 mg 5-bromo-4-chloro-3-indolyl phosphate (BCIP; Promega) in 7.5 ml of AP 9.5 buffer at room temperature until the signal appeared. Finally, TE buffer (10 mM Tris-HCl pH 8.0, 1 mM EDTA pH 8.0) was added to stop the reaction. As a negative control, a western blot was simultaneously processed in which only the secondary antibody was used.
Immunofluorescence analysis of the orfH79product in anther and root tip
Five-day-old root tips and premeiotic anthers of YtA were dissected, fixed and sectioned, as described by Paciorek et al. . After dewaxing and rehydration, the sections were washed six times in PBST, 5 min each wash. They were then blocked in 0.5% (w/v) BSA and 5% (v/v) normal goat serum in PBST for 30 min at room temperature, and finally incubated overnight at 4°C in a 1:100 dilution of the primary antibody in PBS, 5% (w/v) non-fat milk, 0.05% (v/v) Tween-20. After six washes of 5 min each in PBST, the slides were incubated with goat anti-rabbit FITC-conjugated secondary antibody (1:50) at room temperature for 2 h, and subjected to five 10-min washes in PBST. Hybridization signals were visualized and captured by a cool CCD camera mounted on an Olympus BX51 microscope.
Root length and the number of lateral root assay
T1 seeds of the transgenic and non-transgenic plants were sown on 1/2 MS medium containing 0.3% (w/v) phytagel (Sigma, St Louis, MO, USA). Images of 5-day-old and 7-day-old roots were collected, and length and lateral root numbers were recorded. Eight to ten roots were measured in each of three to five replicates.
Detection of ROS
T1 seeds of three independent transgenic and non-transgenic plants and seeds of YtA and YtB were de-husked, sterilized and then germinated on 1/2 MS medium containing 1.0% (w/v) phytagel gel. Five-day-old seedling root tips were harvested. ROS detection was performed as previously described by Umbach et al. with slight modifications. Briefly, root tips were excised and placed in 4 ml of 1 mM Tris-Cl, pH 8.0, and gently shaked at 23°C in dark for 30 min. Then the roots were incubated with 10 μM 2',7'-dichlorodihydrofluorescein diacetate (H2DCFDA[Sigma]) in 1 mM Tris-Cl buffer (pH 8.0) for 10 min. After a briefly rinsing with the Tris-Cl buffer to remove the dye, the roots were imaged with a confocal microscope. Optical filters were set to the maximum absorption wavelength of 488 nm and the emission wavelength of 530 nm. The experiment was performed in triplicate. For anther ROS detection, the anthers were punctured by a dissecting needle so that the H2DCFDA could penetrate easily. Image analysis and quantification of the fluorescence intensity were performed by the Leica LCS Lite software.
ATP and ADP measurements
0.5 g fresh weight (FW) of one week old root tip from YtA and YtB were collected respectively. Three-week old T1 progeny transgenic seedlings, as well as the negative plants that had been segregated from T1 progeny as a negative control were etiolated for three days. Root tips and etiolated plants (0.5 g FW) were ground in liquid nitrogen. ATP and ADP were extracted using 4.5% HCLO4 according to Botrel and Kaiser  and measured by the luciferin-luciferase method [38, 39] following the protocol of the ATP detection kit (Beyotime, China). ADP was converted to ATP by pyruvate kinase (EC18.104.22.168) (Sigma). The ATP content was assayed by luminescence in a Multifunctional Microplate Reader (SpectraMax M2, MDC). Three independent transgenic lines were used in this experiment, and each measurement was repeated three times.
Measurement of mitochondria membrane potential (ΔΨm)
T1 seeds of transgenic and non-transgenic plants were de-husked, sterilized, and germinated on 1/2 MS medium at 28°C in the dark. Five-day-old etiolating seedling were harvested for protoplast isolation. About 1 g of young seedlings was sliced into 0.5 mm pieces and placed into a 10 M CPW solution containing 0.7 M mannitol for 2 h for preplasmolysis. The pieces were then incubated in digesting medium (1.5% cellulose enzyme [Sigma], 1% Hemicellulase [Sigma], 0.5% pectolyaser [Onazuk, Japan] in 10 M CPW) for 4 h at 30°C in the dark. Protoplast were purified as described by Parys et al. . The integrity and activity of the protoplasts were checked by staining them with neutral red and observing them with a microscope. JC-1 was used a measure the mitochondrial potential (ΔΨm) as described by Simeonova et al. . The protoplasts (106 ml-1 ) were suspended in JC-1 buffer supplied by the JC-1 kit (Beyotime, China). Briefly, the protoplasts were treated with 10 μg ml-1 of JC-1 in the dark for 20 min, washed twice with JC-1 buffer and analyzed on a Multifunctional Microplate Reader (SpectraMax M2, MDC) with excitation at 490 nm and emission at 530 and 590 nm, respectively. ΔΨm was determined by the ratio of fluorescence intensity at 590 nm to 530 nm in triplicate. With the same kit, mitochondria isolated from the root of YtA and YtB were suspended in JC-1 buffer. Then, 10 μg ml-1 of JC-1 was added. After incubation in the dark for 10 to 15 min, then the mitochondria membrane potential of YtA and YtB was assayed by calculating the ratio of fluorescence intensity at 590 nm to 530 nm in triplicate.
Root respiration measurements
Roots from five-day old YtA and YtB, and one-week-old transgenic and wild type seedlings were prepared respectively. The roots were briefly rinsed in a buffer (10 mM MES-KOH pH 6.5) to remove dead cells and then immediately transferred to the temperature-controlled chamber of a chlorolab 2 electrode (Hansatech, UK) containing 2 ml of buffer. Respiration rate was measured by detection of oxygen consumption at 25°C.
Vitamin C (VC) treatment
Seeds of YtA and YtB were de-husked, sterilized, and germinated in culture solution  containing 100 nM vitamin C at 28°C for five days. The length of the primary roots and the development of lateral roots were measured. Five independent plants for each sample were measured respectively.
Assays for mitochondrial distribution in root tip
Five-day-old roots tips were harvested, then the root tips were stained with 10 μM MitoTracker red (Molecular Probes) for 40 min and then washed in water for 20 min. Image analysis was performed using the Leica LCS Lite software.
P-values were calculated using Microsoft Excel (2003 version). All error bars in the graphs indicate standard errors of the mean. The statistical significance of the experimental data was determined using the two-sided Student's t-test.
We thank Professors Mengxiang Sun, Daichang Yang, and Dr. Xuefeng Chen for their critical reading of the manuscript. This work was supported by Chinese 973 Program (2007CB109005), the Key Grant Project of Chinese Ministry of Education (307018), Natural Science Foundation of China (30571144), the Creation and Utilization in Strong Heterosis Hybrid rice (2009AA101101) and the Foundation for Yong Scientists of Jiang Xi Province (CJJ10044).
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