期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 129, 期 -, 页码 27-34出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2018.05.020
关键词
Chlorophyll; N remobilization; PEPc; Photosynthetic rate; PPDK; Rubisco; Thylakoid N
资金
- National Science Foundation of China [31672221, 31272233]
Remobilization of leaf nitrogen (N) contributes greatly to grain N in maize, but leads to low photosynthetic rate (P-n. P-n is determined by various N components involving in light harvest and CO2 reduction. However, it is less clear which N component is the major contributor for the reduction of photosynthesis in modern stay-green maize hybrids. In this study, we analyzed the relationship between remobilization of different N components and P-n during grain filling stage under low N (no N application) and high N (180 kg N ha(-1)) in a field experiment. The remobilization efficiency of photosynthetic enzymes (PEPc, PPDK and Rubisco) in the leaf was much higher than that of thylakoid N and other N components. Low N supply increased the remobilization efficiency of all the leaf N components. During grain filling stage, the amount of all the N components decreased together with P-n. The ratio of P-n to the N in the PEPc, PPDK and Rubisco kept increase in the whole grain filling stage, while the ratio of P-n to chlorophyll and thylakoid-N decreased. Correlation analysis indicated that P-n was more related to the content of photosynthetic enzymes than to chlorophyll and thylakoid N. It is concluded that photosynthetic enzymes serve as an N storage reservoir at early grain filling stage and their degradation is critical in the reduction of P-n during later grain filling stage. Future breeding targets may be focused on enhancing the efficiency of photosynthetic enzymes during late grain filling stage.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据