Decline in photosynthesis as related to alterations in chloroplast ultrastructure of a cotton leaf during ontogeny

被引:22
作者
Bondada, BR
Oosterhuis, DM
机构
[1] Univ Tennessee, Dept Plant & Soil Sci, Knoxville, TN 37901 USA
[2] Univ Arkansas, Dept Agron, Altheimer Lab, Fayetteville, AR 72704 USA
关键词
Gossypium hirsutum; grana; plastoglobuli; stroma lamellae;
D O I
10.1023/A:1006980806057
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Field studies were conducted to investigate ontogenic changes in leaf photosynthesis and chloroplast ultrastructure of a single cotton (Gossypium hirsutum L.) leaf subtending the fruit. A 20-d old leaf was the most physiologically active with net photosynthetic rate (P-N) Of 16.5 mu mol m(-2) s(-1) and nitrogen (N) concentration of 168 mmol m-2. These values declined with leaf age and a close relationship existed between them. Concurrent with declines in P-N, Ultrastructural alterations occurred In the chloroplast: the 20-d old leaf had increased grana number and thylakoids per granum and a few plastoglobuli. Afterwards, the grana number and thylakoids per granum declined with leaf age indicating disintegrated grana and stroma lamellae. Concomitant with disintegrated membrane system was the presence of numerous large plastoglobuli, The P-N was closely related to grana number and thylakoids per granum suggesting that the decline in P-N with leaf age was associated with ultrastructural changes in the chloroplast.
引用
收藏
页码:467 / 471
页数:5
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