Photosynthetica 1998, 35(3):467-471 | DOI: 10.1023/A:1006980806057

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

Bhaskar Rao Bondada1, D.M. Oosterhuis2
1 Department of Plant & Soil Science, University of Tennessee, Knoxville, U.S.A.
2 Department of Agronomy, Altheimer Laboratory, University of Arkansas, U.S.A.

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 (PN) of 16.5 μmol 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 PN, 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 PN was closely related to grana number and thylakoids per granum suggesting that the decline in PN with leaf age was associated with ultrastructural changes in the chloroplast.

Additional key words: Gossypium hirsutum; grana; plastoglobuli; stroma lamellae

Prepublished online: September 1, 1998; Published: January 1, 1998  Show citation

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Bondada, B.R., & Oosterhuis, D.M. (1998). Decline in photosynthesis as related to alterations in chloroplast ultrastructure of a cotton leaf during ontogeny. Photosynthetica, 35(3), 467-471. doi: 10.1023/A:1006980806057
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