Variation in morphological traits of semi-dwarf indica rice varieties developed by IRRI
1998
Visperas, R.M. | Shaobing Peng | Laza, M.R.C. | De Jesus, J. | Khush, G.S. (International Rice Research Inst., P.O. Box 933, 1099 Manila (Philippines))
It is generally believed that variation in morphological traits among the semi-dwarf indica varieties developed by IRRI is small due to their narrow genetic background. To quantify the genotypic variation in morphological traits, tillering capacity, canopy height, total dry weight, yield component, and growth duration of 41 semi-dwarf indica varieties developed by IRRI in a demonstration plot of the Plant Breeding, Genetics, and Biochemistry Division during the 1997 wet season were measured. The growth duration of the varieties ranged from 101 to 130 days. Total dry weight ranged from 945 to 1782 g/sq.m. There was a highly significant correlation between growth duration and total dry weight production. Canopy height which ranged from 78 to 128 cm, was highly correlated with growth duration. There was a wide variation in yield component characteristics. Grain filing percentage ranged from 28 to 78 percent and the harvest index varied from 15.7 to 46.3 percent. There was a highly significant correlation between grain filling percentage and harvest index. The number of spikelets/panicle ranged from 50 to 108. The weight of 1,000 grains was in the 18.3-30.5 g range. Although semi-dwarf indica varieties are generally high-tillering, the number of stems/hill varied widely from 17 to 33. The results showed that genetic donors for breeding new rice varieties with different tillering, panicle size, grain weight and plant height can be found among these semidwarf indica varieties
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