Changes in net photosynthetic rate and chlorophyll fluorescence in potato leaves induced by water stress
1998
Basu, P.S. | Sharma, A. | Sukumaran, N.P. (Central Potato Research Inst., Shimla (India). Div. of Crop Physiology a Biochemistry)
Net rates of photosynthesis (PN) saturated by irradiance of 500 pmol m-Z s-1 significantly decreased in water-stressed potato (Solanum tuberosum cv. Kufri Sindhuri) plants. The quantum yield of photochemical energy conversion (Fv/Fm), relative electron transport rate, and photochemical quenching exhibited a parallel decline at high irradiance. A slight decrease in relative water content was accompanied by a drastic decline in leaf water potential 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.
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