Hybrid rice heterosis in Tamil Nadu
1988
Rangaswamy, M. | Natarajamoorthy, K. (Tamil Nadu Agricultural Univ., Coimbatore (India). School of Genetics)
Thirty eight (38) F1s involving Zhen Shan 97A and Er-jiu-Nan 1A as the female parents were studied during 1985 dry season. All combinations had higher standard heterosis and heterobeltiosis for tiller numbers. High tiller numbers were reflected in straw yield, with standard heterosis as high as 134% and heterobeltiosis as high as 112%. Standard heterosis for grain yield was only 8%, because of heterosis for spikelet sterility as high as 226% compared to the standard variety and 909% compared to the pollen parents. Heterosis for tiller number gives scope for improving hybrid seed fertility by selecting restorers for genetic constitution and CMS lines for cytoplasmic content.
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