杂交水稻及其亲本光合特性的研究　Ⅲ.功能叶片碳代谢中一些酶活性

STUDIES ON PHOTOSYNTHETIC CHARACTERISTICS IN RICE HYBRID PROGENIES AND THEIR PARENTS Ⅲ. SOME ENZYME ACTIVITIES OF CARBON METABOLISM IN LEAVES

对杂交水稻青优159（母本青A，父本R159）和广优四号（母本广A，父本青六矮）及其亲本功能叶片光合碳代谢中一些酶活性进行了研究。实验结果表明了两组杂交水稻的RuBPCase活性、RuBPCase/RuBPOase活性比值超过其各自的亲本；而杂交水稻青化159和广优四号的RuBPOase活性、乙醇酸氧化酶活性、光呼吸速率、光呼吸速率与光合速率的比值明显的低于其各自双亲．对RuBPCase活性和乙醇酸氧化酶活性与光合速率进行相关分析，结果表明RuBPCase活性与光合速率有正相关关系，相关系数为0．768；而乙醇酸氧化酶活性与光合速率负相关，相关系数为-0．834；两者均达到α＝0．05显著水平。

Some enzyme activities of carbon metabolism in leaves of two rice hybrid progenies and their parents were compared. The rice hybrids used were Qingyou 159 [from Qing A and R159 ] and Guangyou No.4 [from Guang A (Y ) and Qingliuai ]. It was found that the activity of RuBPCase, and the RuBPCase/RuBPOase ratio in both hybrids were higher than those ifl their own parents. The activities,of glycolate oxidase and RuBPOase, the photorespiration(Pr) and Pr/Pn ratio in both rice hybrids were Iower than those in their respective parents. Statistical analysis showed that.the photosynthetic rates (Pn) were in postive correlation with RuBPCase activity (r=0.768), and in negative correlation with the aCtivity of glycolate oxidase (r=-0.834). Both correlation coeffcients were significantly different at p=0.05 levels.