Physiological traits of selected maintainers in hybrid rice breeding
1993
Murty, K.S. | Dey, S.K. | Swain, P. | Baig, M.J. (Central Rice Research Inst., Cuttack (India))
The high-photosynthetic rate entries IR19791-12-1-2-2-2 and IR19891-12-3-2-1 had low LAI [leaf area index]. IR19806-8-1-3-2 and Sernaigincha 61-54, however, recorded moderate photosynthetic rate with high LAI, implying high crop photosynthesis. Photosynthetic rate is significantly associated (r = 0.727** ) with specific leaf weight (SLW), suggesting the usefulness of SLW as a preliminary selection parameter for high photosynthetic rate entries. IR22107-120-1 showed vigor in TDM [total dry matter] production at early and late growth stages. IR33955-8-1-1 and IR28142-6-3-2-2-2 had high TDM produced at flowering and harvest. These three maintainers combined high TDM and harvest index (HI), resulting in superior grain yield. The postflowering TDM was strongly related to grain yield (r = 0.880** ). When transferred into male sterile cytoplasm, maintainers such as IR33955-8-1-1, IR22107-120-1, and IR28138-43-3-1-3-2 may provide effective CMS lines for developing heterotic rice hybrids
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