Genetic variability and interrelationships of grain yield and its components of irrigated rice in Gezira
2007
Osman, K.A.
Nineteen genotypes of irrigated rice were evaluated at the Gezira Research Station Farm, Wad Medani, Sudan, for two consecutive seasons (2004 and 2005) in a randomized complete block design with three replicates, to estimate the genotypic and phenotypic variability, broad sense heritability and traits association for grain yield and its components. A wide range of variability was detected among the genotypes for most of the studied traits. The highest genotypic coefficient of variation and genetic advance were recorded for plant height and number ofpanicles/m2, and the lowest for number of tillers/plant, days to 50% flowering, days to 50% maturity and panicle length in both seasons. High heritability estimates (80%) were recorded for plant height, days to 50% flowering, days to 50% maturity and 1000 grain weight. Highest percent of heritability estimate combined with the highest genetic advance as percentage of the mean was shown by pl ant height and 1000 grain weight in both seasons. The high yielding genotypes were;WITA5 (TOX 3255¬82-1-3-2), IRI 3240-108-2-2-3(SAHEL.108)(FKR44) and TOX 3081-36¬2-2-3-1. Their grain yields were 4.9, 4.9 and 4.6 t/ha, respectively. Grain yield/ha was significantly and negatively correlated with percent of unfilled grains/panicle, plant height and days to 50% flowering. However, it was significantly and positively correlated with number of tillers/plant, number of panicles/m2, number of filled grains/panicle and 1000 grain weight in both seasons. Path coefficient analysis indicated that number of filled grains/panicle, 1000 grain weight and number of panicles/m2 were the most important traits related to the grain yield/ha
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