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Genetic analysis of some agronomic traits in grain sorghum sorghum bicolor l. moench i. heterosis



Genetic analysis of some agronomic traits in grain sorghum sorghum bicolor l. moench i. heterosis



Revista Brasileira de Genetica 9(4): 659-678



The present work was carried out at the ICRISAT Experimental Station at Patancheru, A.P., India during the rainy and post-rainy seasons of 1982/83. The experimental material consisted of 11 male-sterile lines of sorghum (Sorghum bicolor (L.) Moench), 9 restorers and all the possible 99 F1 hybrids using an RBD design for hybrid and parent experiments. Heterosis was estimated by comparing hybrid performance with their respective superior parents and the following traits were observed: days to 50% blooming, plant height, head length number of grains per head, 1000 grain weight and yield per head. Plant height, head length and number of grains per head showed a positive heterotic effect during both seasons, while yield per head was positive during the post-rainy season only. On the other hand, days to 50% blooming and 1000 grain weight during both seasons, and yield per head during the rainy season showed negative average heterosis. Regarding yield per head, the average heterosis of hybrids was positive, especially for the male-sterile line 2077A and the restorer MR849 during the rainy season. For 1000 grain weight the average heterosis for the 99 hybrids was negative during the rainy and post-rainy season even though the heterotic value of the restorer MR849 was remarkably high in both environments. Considering yield per head, the male-sterile lines MA3, MA1, 623A and MA2 produced hybrids with positive effect during the rainy season and the restorer MR849 was the parent most adapted to the rainy season, while MR801 and MR864 were the most adapted to the second crop season. The range of heterotic effects varied form -47.1% (2077 A .times. MR825) to 108.8% (MA6 .times. MR849) during the rainy season and from -30.5% (MA 6 .times. MR803) to 102.3% (MA1 .times.MR801) during the post-rainy season, indicating that the genetic diversity of the parents did not necessarily result in positive heterosis estimates for all their hybrids.

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Accession: 005511397

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