【摘要】 以多年来大面积推广的杂交水稻汕优63为对照,研究了超高产杂交水稻两优培九的光合生理特性。结果表明:在生殖生长期两优培九剑叶具有较高的叶绿素含量、Fv/Fo、Fv/Fm、qP、φi和Rubisco含量,表明它有相对较高的光能吸收、转化和利用的能力;且两优培九的qN较汕优63大,1-qP/qN比它小,说明它比对照品种更耐光抑制;两个品种在剑叶衰老过程中都发生了光碳失衡,但两优培九光碳失衡状态较轻;这些可能是超高产水稻两优培九高产的重要原因。更多还原

【Abstract】 Two hybrid rice cultivars, super high-yielding Liangyoupeijiu (Pei’a i 64S×9311) and high-yielding Shanyou 63 (as control) grown in the field, wer e us ed to investigate the photosynthetic characteristics of highproduction during flag leaves development. It was shown that the contents of chl orophyll and Rubisco, the values of Fv/Fo, Fv/Fm, qP andφi in flag leaves of c v . Liangyoupeijiu were higher than those of the control, indicating that the fo rm er had greater capacity and higher efficiency for light energy absorption, tr ans formation and utilization. The value of qN was higher and 1-qP/qN was lower in Liangyoupeijiu than in Shanyou 63, showing that the former was more toleran t to photoinhibition. Photo-carbon imbalance appeared in both cultivars during senesc ence of flag leaves, but which was less apparent in cv. Liangyoupeijiu. T hese be neficial factors in photosynthesis in cv.Liangyoupeijiu might be of importance in high production of super high-yielding rice.更多还原