Dry mass accumulation of different organs of the rice plant under water deficit conditions
Abstract
The present study evaluated the effect of water deficit at tillering stage on dry biomass accumulation in different organs of rice plants, Oryza sativa L. cv. Jucarito-104, cultivated in two sowing dates, dry and wet seasons. Water deficit imposed at maximum tillering stage was reflected in the relative water content of the leaf and volumetric water content of the soil in comparison to the flooded treatment. From 10 days after anthesis to maturity, high reductions in the biomass duration were obtained in the flag leaf sheath and main stem in plants from water deficit treatment. This stage coincided with the increment of biomass duration of panicles. The results allowed to conclude that under conditions of water deficit, the panicle filling depends essentially from photoassimilate stored in main stem and flag leaf sheath. In the wet season, a high duration of leaf area allowed higher biomass duration of main stem and of the flag leaf sheath than in the dry season. This suggests that the climatic conditions has influence on the partition of photoassimilates to contribute to the yield of the plants under these conditions.
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Copyright (c) 2009 Aymara García , Maydelin Dorado, Isel Pérez, Reinaldo Cun, Teresa López, Eugenio Montilla
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