Rationale for a low-tillering rice plant type with high-density grains
1991
Vergara, B.S. | Venkateswarlu, V. | Janoria, M. | Ahn, J.K. | Kim, J.K. | Visperas, R.M.
Rice yields during the last 20 yr have been greatly increased through varietal improvement and accompanying management practices. During the last decade, however, yields 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 the production of more high-density (HD) grains are proposed. Studies at IRRI [International Rice Research Institute, Los Banos, Laguna, Philippines] during the last 6 yr showed the possibility of increasing grain yield potential by increasing the number of HD grains. The new plant-type should be a low-tillering, panicle-weight type and have panicles 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 height. The roles of environmental factors and cultural management on the production of HD grains are still being studied.
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