Abstract: This paper concerns the photosynthetic characteristics of a yellow-green nucleus mutant ofricewhich was obtained in anther culture by us. The content of total chlorophyll, xanthophyll and β-carotene in the mutant leaves is about 31%, 40% and 75% of that ill normal leaves respectively; the chl a/chl b ratio of the mutant is much higher than that of normal leaves. The anal- ysis of SDS-solubilized extracts of the chloroplast lamellae shows that the major light-harvesting chl a/b protein complex of the mutant is extremely deficient, and its chl a/chl b ratio is more than 3. In the chloroplasts of mutant leaves, there are very few grana stacking, and more starch grains can be seen when leaves are exposed to sun light. The rate of CO2 assimilation of mutant leaves exposed to 20000 lux of sun light is 75% of that of normal leaves on a basis of leaf area, and is 185% on a basis of chlorophyll. The chloroplasts of the mutant may also show a much higher rate of ferricyanide Hill reaction on a basis of chlorophyll.

Key words: photosynthetic, characteristics, Yellow-green Rice, mutant

摘要： 本文报道一个黄绿色水稻突变体光合器官结构和功能的某些特点，该突变体是作者通过花药培养得到的细胞核突变体。突变体叶片的叶绿素含量、叶黄素和β胡萝卜素含量分别约为正常叶片的30％、40％和75％；chl a／chlb比值显著高于正常叶片。对SDS增溶的叶绿体片层叶绿素蛋白质复合物分析表明，突变体的捕光chl a／chl b蛋白质复合物极度减少，该复合物chl a／chl b比值大于3。突变体的叶绿体明显缺乏基粒堆积，在日光下容易较快积累淀粉粒。突变体的叶绿体悬液有较高的铁氰化钾光还原活性。在2万lux日照强度下，突变体叶片同化二氧化碳的速率，以单位叶面积计算为正常叶片的75％，以单位叶绿素计算为正常叶片的185％。结果证明，叶绿体基粒结构与捕光chl a/b蛋白质含量正相关，它并非为光合作用基本过程的进行所必需。

关键词: 黄绿色, 水稻突变体, 光合作用