Photosynthetica 1998, 35(1):13-19 | DOI: 10.1023/A:1006801311105

Changes in net photosynthetic rate and chlorophyll fluorescence in potato leaves induced by water stress

P.S. Basu1, Ashoo Sharma1, N.P. Sukumaran1
1 Division of Crop Physiology and Biochemistry, Central Potato Research Institute (ICAR), Shimla -, India

Net rates of photosynthesis (PN) saturated by irradiance of >500 μmol m-2 s-1 (PAR) significantly decreased in water-stressed potato (Solanum tuberosum L. cv. Kufri Sindhuri) plants. The quantum yield of photochemical energy conversion (Fv/Fm), relative electron transport rate (ETR), and photochemical quenching (Qp) exhibited a parallel decline at high irradiance. A slight decrease in relative water content (RWC) was accompanied by a drastic decline in leaf water potential (Ψw) from -0.2 to -1.0 MPa. Dehydrated leaves showed an increase in the amount of total soluble sugars per unit leaf area which inhibited the photosynthesis in a feedback manner. After rewatering, PN and Fv/Fm were restored to the values of control plants within 24 h, and the restoration was accompanied by a proportionate lowering of content of total soluble sugars in the leaves.

Additional key words: drought; electron transport; feedback inhibition; photochemical quenching; osmotic potential; quantum yield; Solanum tuberosum; water potential

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

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Basu, P.S., Sharma, A., & Sukumaran, N.P. (1998). Changes in net photosynthetic rate and chlorophyll fluorescence in potato leaves induced by water stress. Photosynthetica, 35(1), 13-19. doi: 10.1023/A:1006801311105
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