Physiological and comparative proteome analyses reveal low-phosphate tolerance and enhanced photosynthesis in a maize mutant owing to reinforced inorganic phosphate recycling

Table 6 Influence of different phosphorus concentrations on the activities of several enzymes involved in photosynthesis

Inbred line	Pi treatment	RuBisCO (μmol CO₂ mg pr^-1 min^-1)	PGM (μmol NADPHmg^-1 prmin^-1)	FBPaldose (μmol NADH/mg pr*min)	NADP-malic enzyme (μmol NADPHmg^-1 prmin^-1)	PPDK (μM AMP/mg Pr. min)
Qi319-96	+P	0.24 ± 0.03a	2.19 ± 0.12a	0.55 ± 0.02a	7.76 ± 0.24b	85.44 ± 2.71a
Qi319-96	–P	0.18 ± 0.08b	0.84 ± 0.04c	0.29 ± 0.08b	8.47 ± 0.22a	55.48 ± 2.02b
Qi319	+P	0.23 ± 0.05a	2.33 ± 0.12a	0.54 ± 0.04a	7.11 ± 0.05c	83.27 ± 1.28a
Qi319	–P	0.13 ± 0.06c	0.47 ± 0.01b	0.16 ± 0.01c	6.75 ± 0.11d	45.35 ± 1.59c

Three seedlings per bottle were cultured in phosphorus saturation solution (1000 μM KH₂PO₄) to the three-leaf stage, followed by low phosphate stress solution (5 μM KH₂PO₄) for an additional 25 days to the six–seven-leaf stage. Values represent the means of nine seedlings ± SD. Values with different letters within a row are significantly different (P < 0.05) by multiple comparison analysis

ISSN: 1471-2229