Rationale for a low tillering rice plant type with high density grains
1990
Vergara, B.S. | Venkateswarler, B. | Janoria, M. | Ahn, J.K. | Kim, J.K. | Visperas, R.M. (International Rice Research Inst., Los Banos, Laguna (Philippines). Plant Physiology and Agroecology Div.)
Rice yields during the last 25 years have greatly increased through varietal improvement and the accompanying management practices. However, rice yields during the last two decades have apparently reached a plateau and efforts to further improve yielding ability have not resulted in visible gains. A different plant type and accompanying changes focused on production of more high density (HD) grains are proposed and the rationale presented. Studies by the Plant Physiology Department of IRRI [International Rice Research Institute] during the last 6 years showed the possibility of increasing grain yield potential by increasing the number of HD grains. The proposed plant type should be low tillering, panicle weight type; have panicle with more primary branches, spikelets with large pedicellar vascular bundles, thick culms, medium-size grains, erect and thick leaves, dark green flag leaf sheath, slow senescence, high photosynthetic rate at low photosynthetically active radiation, medium growth duration, and intermediate plant height. The role of environmental factors and cultural management on the production of HD grains are still being studied.
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