Greenhouse tomato photosynthetic acclimation to water deficit and response to salt accumulation in the substrate
1997
Xu, H.L. (International Nature Farming Research Center, Hata, Nagano (Japan)) | Gauthier, L. | Gosselin, A.
Greenhouse tomato plants (Lycopersicon esculentum Mill. cv. Capello) were grown in a peat-moss based substrate (70% sphag peat and 30% perlite, v/v) and treated with a salinity stress (4.5 mS cm(-1) of electrical conductivity, EC) and a low (55 +- 8% on gravimetric basis) substrate water content (SWC) to examine the effects of salt accumulation and a prolonged substrate water deficit on photosynthesis and plant water relations. Net photosynthetic rate (Pn) decreased by 24% compared to the control one day after SWC was depleted to 55%. However, as SWC was maintained at the same level for several days, the effect of water stress diminished, with the decreasing extent of 14, 15, and 14% compared to the control on the 11th, 16th, and 28th days, respectively, from the beginning of treatments
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