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Relationship between photosynthesis and osmotic adjustment of wheat leaves



Relationship between photosynthesis and osmotic adjustment of wheat leaves



Acta Phytophysiologica Sinica 16(4): 347-354



Two cultivars (drought-resistant cultivar Fengkang 13 and drought-sensitive cultivar Zhengyin 1) of wheat in pots were used to study the relationship between photosynthesis and osmotic adjustment. The experimental results indicated that the sensitivity of leaf water potential to slow soil drought was less than that to fast soil drought, and at the same drought speed, the sensitivity of Zhengyin 1 was higher than that of Fengkang 13. Under slow drought condition, osmotic adjustment of wheat leaves increased to a certain extent with the decreasing of soil water content, and was absent under fast drought condition. By the osmotic adjustment of wheat leaves, the sensitivity of photosynthetic rate and stomatal conductance to water stress decreased, and the time needed for the shift of drought inhibition of photosynthetic rate from stomatal limitation to the photosynthetic action of mesophyll cells was delayed. It was shown that wheat leaves under slow drought condition could maintain higher apparent quantum yield, RuBP carboxylation efficiency, RuBP regeneration, electric transport capacity and fluorescence yield than those under fast drought condition. The results indicated that the osmotic adjustment of wheat leaves under water stress could counteract the adverse effect of drought on stomatal movement and the activities of photosynthetic apparatus, and thus help to maintain the photosynthetic rate at or near the normal level.

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Accession: 002206291

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