期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 39, 期 9, 页码 777-784出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/S0981-9428(01)01296-7
关键词
Brassica napus; chloroplast; cotyledon; phosphoenolpyruvate carboxylase; photosystem; plastoglobuli; Rubisco; senescence
The ultrastructural and biochemical changes occurring in chloroplasts of canola (Brassica napus cv. Topas) cotyledons during senescence were characterized utilizing 1-, 2-, 3-, and 4-week-old plants. Chlorophyll a and b and carotenoid contents per unit cotyledon area were greatest 2 weeks after planting prior to the decline in total protein content. Photosystem II (PSII) activity per unit area of cotyledon was highest during the first week and declined through week 4. In contrast, photosystem I activity and CO2 assimilation remained relatively stable through week 2 and then declined. High levels of PSII activity were associated with large numbers of stacked grana; whereas loss of activity during week 2 was accompanied by reduced compactness of grana and the aggregation and enlargement of plastoglobuli. (C) 2001 Editions scientifiques et medicales Elsevier SAS.
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