A QTL on the short arm of wheat (Triticum aestivum L.) chromosome 3B affects the stability of grain weight in plants exposed to a brief heat shock early in grain filling

Shirdelmoghanloo, Hamid; Taylor, Julian D.; Lohraseb, Iman; Rabie, Huwaida; Brien, Chris; Timmins, Andy; Martin, Peter; Mather, Diane E.; Emebiri, Livinus; Collins, Nicholas C.

doi:10.1186/s12870-016-0784-6

Table 2 QTL effects locating to QTL11 and QTL27, the only loci in the Drysdale × Waagan population that showed heat-tolerance effects for single grain weight

From: A QTL on the short arm of wheat (Triticum aestivum L.) chromosome 3B affects the stability of grain weight in plants exposed to a brief heat shock early in grain filling

QTL	Trait	Condition	Expt.	Positive allele	Test statistic	R²	Additive effect
QTL	Trait	Condition	Expt.	Positive allele	-Log₁₀(p)	R²	Additive effect
QTL11	ChlC10DAA	Pre-heat	1,2	W	11, 7.4	18, 17	0.71, 0.65
QTL11	ChlC13DAA	Control	1,2	W	7.7, 8.9	15, 19	0.59, 0.67
QTL11	ChlC27DAA	Control	1,2	W	8.6, 12	17, 23	0.66, 0.68
QTL11	AUSC	Control	1,2	W	7.5, 11	15, 20	10.8, 11
QTL11	HI	Control	2	D	8.7	12	0.94
QTL11	GFD	Heat	1	W	6.4	13	0.76
QTL11	FLSe	Heat	1	W	5.5	14	2.06
QTL11	GWS	Heat	1	W	7.1	11	0.11
QTL11	SGW	Heat	1	W	7.0	12	1.65
QTL11	ShW	Heat	1,2	W	18, 5.8	14, 3.5	0.14, 0.1
QTL11	ChlC13DAA	Heat	1,2	W	26, 16	42, 34	2.01, 1.95
QTL11	ChlC27DAA	Heat	1,2	W	36, 8	54, 20	2.49, 2.55
QTL11	AUSC	Heat	1,2	W	33, 13	49, 28	37, 34.3
QTL11	ChlR13	Heat	1,2	W	20, 13	40, 27	0.37, 0.37
QTL11	ChlR27	Heat	1	W	30.0	50	0.07
QTL11	GFD	HSI	1	D	4.4	10	0.12
QTL11	FLSe	HSI	1	D	6.7	14	0.27
QTL11	GWS	HSI	1,2	D	8.8, 5.9	22, 15	1.16, 0.38
QTL11	SGW	HSI	1,2	D	8.1, 4.7	20, 11	0.92, 0.16
QTL11	ShW	HSI	1	D	9.3	23	1.62
QTL11	AUSC	HSI	1,2	D	21, 7.3	38, 18	0.91, 0.67
QTL11	ChlC13DAA	HSI	1,2	D	17, 10	36, 24	0.67, 0.81
QTL11	ChlC27DAA	HSI	1,2	D	21, 5.3	39, 13	1.28, 0.62
QTL11	ChlR13	HSI	1,2	D	16, 13	40, 27	0.55, 0.8
QTL11	ChlR27	HSI	2	D	9.3	19	0.40
QTL11	HI	HSI	2	D	4.1	10	0.29
QTL27	AUSC	Heat	2	D	3.7	9.1	19.53
QTL27	ChlR13	Heat	2	D	4.8	8.9	0.21
QTL27	SGW	HSI	2	W	3.8	12	0.17
QTL27	ChlR13	HSI	2	W	4.8	8.9	0.46

Where corresponding QTL effects were identified in both experiments, the positive allele was always the same; for other attributes, values for Expt. 1 and 2 are shown separated by a comma
Positive allele: D Drysdale, W Waagan, Positive allele for Heat Susceptibility Index (HSI) means associated with intolerance
Additive effect always refers to the effect of the positive allele
DTA days from sowing to anthesis, DTM days from sowing to maturity defined as 95 % spike senescence, GFD grain-filling duration defined as days from anthesis to 95 % spike senescence, FLSe days from anthesis to 95 % flag leaf senescence, GWS grain weight spike⁻¹ (g), GNS grain number spike⁻¹, SGW single grain weight (mg), ShW shoot dry weight (g), PH plant height (cm), ChlC10DAA chlorophyll content 10 days after anthesis, i.e., just before heat treatment period (SPAD units), ChlC13DAA chlorophyll content 13 days after anthesis, i.e., just after heat treatment period (SPAD units), AUSC area under the SPAD curve made from measurements at 10, 13 and 27 days after anthesis, i.e., incorporates the period during-heat treatment and 2-weeks after, ChlR13 rate of chlorophyll change between 10 and 13 days after anthesis, i.e., during the heat treatment period (SPAD units day⁻¹), ChlR27 rate of chlorophyll change based on the linear regression of the measurements, at 10, 13 and 27 days after anthesis (SPAD units day⁻¹), FL flag leaf length (cm), FW flag leaf width (cm), HI harvest index (%)

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ISSN: 1471-2229

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