摘要
本文报告了在育性转换敏感期光周期处理对湖北光敏核雄性不育水稻（农垦５８ｓ）最新全展叶叶绿体光合特性的影响。结果表明：与短日照（ＳＤ）相比，长日照（ＬＤ）处理的农垦５８ｓ水稻叶绿体只有较低的ＰＳⅡ光化活性和ＰＳⅡ原初光能转化效率，其ＰＳⅡ和全链的电子传递速率低，叶绿体中叶绿素ｂ的含量较少，叶绿素ａ／ｂ值比短日照处理的高约１０％。长日照处理使农垦５８ｓ叶绿体的光化活性普遍下降，这可能是导致农垦５８ｓ败育的初始原因之一。
The effects of photoperiod treatments at the sensitive stage of fertility on photosynthetic characteristics of chloroplasts in newly developed leaves of HPGMR (Hubei photoperiodsensitive Genie Male- sterile Rice,Nongken 58s) were studied.The results showed that long and short Photoperiod brought about differenced in photosynthetic characteristics of chloroplasts from Nongken 58s plants.Compared with short day treatment(SD 10 h light a day),long day treatment(LD 15 h light a day) resulted in lower PS Ⅱphotochemical activity and lower efficiency of primary conversion of light energy in PS Ⅱ(Table 1).The rate of electron transport in PS Ⅱ and through the whole chain under LD was lower too(Table 3).The chloroplasts from LD-treated leaves of Nongken 58s (58s-LD) contained less chloroPhyll b than 58s-SD(Table 4).This was in conforming with the results of fluorescent measurment that the distribution of excitation energy in chloroplasts of 58s-LD was less favorable to PS E(T8ble 2).The marked decline of Photochemical activity of Nongken 58s chloroplasts induced by LD may result in lower amount of various photosynthetic products,which are probably involved in the primary cause of male sterility.
基金
国家高技术研究发展计划资助
关键词
水稻
雄性不育
叶绿体
光合作用
rice,male sterility,chorolplast,exitation energy,efficiency of conversion of light energy
