摘要
以两系杂交稻PA64S/E32和汕优63为材料,在自然条件下测定叶绿素荧光参数和同化产物分配等关键指标。在中午(高光高温)和叶衰老过程中,PA64S/E32的叶绿素、蛋白质含量、PSⅡ原初光化学效率(Fv/Fm)、量子产量(φPSⅡ)和光化学猝灭系数(qP)的降低较少;非光化学猝灭系数(qN)增加较少。表明在自然条件下,两系杂交稻PA64S/E32吸收的光能能较多的转化为化学能,通过热耗散的能量较少,表现耐光抑制。通过用同位素14C对光合同化产物运转分配进行研究,发现两系杂交稻PA64S/E32光合同化产物向穗部的运转速率和分配比率均较高,表明其具有较好的源库协调性。上述有关光合和同化产物的分配特点可能是两系超级稻高产的生理基础。
Using hybrid rice PA64S/E32 and Shanyou63 as materials, chlorophyll fluorescence assimilate distribution and other key indexes were assayed under natural condition. Compared parameters , with that of Shanyou63, the decrement of contents of chlorophyll and protein, PS Ⅱprimary photochemical efficiency （Fv/ Fm）, photon yield φPS Ⅱ） and photochemical quenching coefficient （qP） were less; increment of non-photochemical quenching coefficient （qN）and Fo were less in two-line hybrid rice PA64S/E32 at noon （high light intensity and temperature） and during leaf senescence. Transport rate and distribution ratio of photosynthetic assimilate to ear were all-higher, which indicated that PA64S/E32 had better coordination of source-sink in terms of the studies on photosynthetic assimilate using isotope. The above photosynthetic characteristics and assimilate distribution is possibly the physiological basis of high yield in two-line hybrid rice PA64S/E32.
出处
《中国农学通报》
CSCD
2006年第4期276-280,共5页
Chinese Agricultural Science Bulletin
基金
安徽省自然科学基金项目"水稻光抑制和强光适应机制"(01041106)
安徽农业大学校长青年基金"不同绿化树木的叶绿素荧光特性的研究"(0400112)
安徽农业大学大学生创新基金"几种水稻突变体的光合特性的研究"(050088)。
关键词
两系杂交稻
光抑制
叶绿素荧光特性
同化产物
Two-line hybrid rice, Photoinhibition, Characteristics of chlorophyll fluorescence, Photosynthetic assimilate
