摘要
以高产杂交稻‘两优培九’(LYP9)和杂交稻‘汕优63’(SY63)为研究材料,用^(14)C同位素示踪等技术,研究了剑叶的叶片与叶鞘的光合作用与光合产物向叶鞘的分配。结果表明,‘两优培九’剑叶及其叶鞘的净光合速率的均值均高于‘汕优63’;剑叶叶鞘中部群体内透光率均值、倒二叶叶鞘中部群体内的透光率均值高于‘汕优63’;剑叶及其叶鞘的Rubisco初始羧化活性均值、总羧化活性均值和活化率均值都高于‘汕优63’,其差异大多数时期达显著水平。‘两优培九’叶鞘光合产物的输出比‘汕优63’快,其叶鞘光合产物输送到穗部的量即转化为经济产量的量比‘汕优63’高。‘两优培九’叶鞘的光合产物主要输送到穗等部位,对产量有一定的(约为15%)贡献。
Using high-yielding hybrid rice ＇Liangyoupeijiu＇ （LYP9） and hybrid rice ＇Shanyou 63＇ （SY63） as the experimental materials and using 14C radio-autography, the photosynthetic capacities and distribution of photosynthates in flag leaf blades and sheaths of LYP9 were studied. The results showed that net photosynthetic rates （Pn） of the flag leaf blades and sheaths of LYP9 were much higher than those of SY63; the light transmissivity rates （LT） measured at the medium height of the flag leaf sheaths and the penultimate leaf sheaths were also significantly higher than those of SY63. The incipient activities, total activities and activation percentages of Rubisco in the flag leaf blade and sheath of LYP9 were all higher than those of SY63. The photosynthate transport rate in the sheaths of LYP9, and the quantity of photosynthate transported to the spikes and transformed to economic yield of LYP9 were all higher than those of SY63. The photosynthates produced by the sheaths were mainly transported to spike to make a certain contribution （about 15%） to yield.
出处
《植物生理与分子生物学学报》
CAS
CSCD
北大核心
2007年第6期531-537,共7页
Journal Of Plant Physiology and Molecular Biology
基金
国家自然科学基金项目(Nos.30600049,30670790)
湖南省科技厅(No.2007FJ3003)资助。
关键词
高产杂交稻
剑叶
叶片
叶鞘
光合作用
high-yielding hybrid rice
flag leaf
blade
sheath
photosynthesis
