摘要
以淡绿叶水稻近等基因系fgl及其正常叶色的轮回亲本浙辐802为材料,比较了不同叶色水稻抽穗后叶片的衰老进程,并在水稻抽穗后施以不同强度的光照,研究水稻生育后期光照强度对不同叶色水稻叶片衰老的影响。在自然光强下,淡绿叶水稻fgl的衰老慢于轮回亲本浙辐802,fgl的叶绿素、叶面积指数和净光合速率的下降速率均慢于浙辐802,特别是在灌浆前期和后期;开花后浙辐802的SOD活性下降和MDA含量的上升均快于fgl。15%的遮光处理有利于提高浙辐802的气体交换特性和光合性能,提高SOD活性,降低MDA含量;而浅叶色的fgl的光合速率较稳定,受光强的影响较小。
With near-isogenic line fgl （faded green leaf） and Zhefu 802（recurrent parent, green leaf） as materials, the leaf senescence course of different leaf color rice was compared, and the effect of light intensity on leaf senescence was studied. Under natural light intensity, fgl rice lines senesced more slowly than normal green leaf rice Zhefu 802. The chlorophyll content, leaf area index and photosynthetic rate of fgl lines decreased more slowly than those of Zhefu 802, especially at the initial grainfilling stage and late grain-filling stage. Moreover, superoxide dismutase （SOD） activity of flag leaves in fgl lines decreased more slowly, while malonaldehyde （MDA） content increased faster compared to Zhefu 802 after flowering. Low irradiance delayed rice leaf senescence. The chlorophyll content, photosynthetic rate, intercellular CO2 concentration, stomatal conductance of Zhefu 802 increased significantly at 85% of natural light intensity compared to natural light intensity, while the photosyn thetic rate of fgl was stable and insensitive to light intensity changes.
出处
《中国水稻科学》
CAS
CSCD
北大核心
2008年第1期77-81,共5页
Chinese Journal of Rice Science
基金
浙江省自然科学基金资助项目(Y304135)
关键词
水稻
叶色
衰老
光强
超氧化物歧化酶活性
丙二醛含量
rice
leaf color
senescence
light intensity
superoxide dismutase activity
malonaldehyde content
