Zhang Meiping, Shan YongJie, Kochian Leon, Strasser Reto J, Chen GuoXiang
College of Life Sciences, ShanXi Normal University, Linfen, 041004, Shanxi, People's Republic of China.
College of Geography Sciences, ShanXi Normal University, Linfen, 041004, Shanxi, People's Republic of China.
Photosynth Res. 2015 Dec;126(2-3):275-84. doi: 10.1007/s11120-015-0151-8. Epub 2015 May 14.
Chlorophyll a fluorescence of flag leaves in a super-high-yielding hybrid rice (Oryza sativa L.) LYPJ, and a traditional hybrid rice SY63 cultivar with lower grain yield, which were grown in the field, were investigated from emergence through senescence of flag leaves. As the flag leaf matured, there was an increasing trend in photosynthetic parameters such as quantum efficiency of primary photochemistry ([Formula: see text] Po) and efficiency of electron transport from PS II to PS I (Ψ Eo). The overall photosynthetic performance index (PIABS) was significantly higher in the high-yielding LYPJ compared to SY63 during the entire reproductive stage of the plant, the same to MDA content. However, [Formula: see text] Po(=F V/F M), an indicator of the primary photochemistry of the flag leaf, did not display significant changes with leaf age and was not significantly different between the two cultivars, suggesting that PIABS is a more sensitive parameter than [Formula: see text] Po (=F V/F M) during leaf age for distinguishing between cultivars differing in yield.
对田间种植的超级高产杂交水稻（Oryza sativa L.）LYPJ和产量较低的传统杂交水稻品种SY63剑叶的叶绿素a荧光进行了研究，研究时段从剑叶出现至衰老。随着剑叶成熟，诸如原初光化学量子效率（[公式：见正文] Po）和从PS II到PS I的电子传递效率（Ψ Eo）等光合参数呈上升趋势。在植株整个生殖阶段，高产的LYPJ的总体光合性能指数（PIABS）显著高于SY63，丙二醛（MDA）含量情况相同。然而，作为剑叶原初光化学指标的[公式：见正文] Po（=F V/F M）并未随叶龄呈现显著变化，且两个品种之间也无显著差异，这表明在叶龄阶段，PIABS是比[公式：见正文] Po（=F V/F M）更敏感的区分不同产量品种的参数。
