Nature and type of gene action governing resistance toHelminthosporium turcicumleaf blight in maize (Zea maysL.)
✍ Scribed by S. Shankar Lingam; K. A. Balasubramanian; P. Raghu Ram Reddy
- Publisher
- Springer Netherlands
- Year
- 1989
- Tongue
- English
- Weight
- 478 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0016-6707
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✦ Synopsis
Six generations, consisting of three resistant parents, three susceptible parents, their 15 possible F1 crosses, 15 Fz's, 15 BCI's (F1 × resistant female parent) and 15 BC2's (FI × susceptible male parent) were analysed following Hayman (Heredity 12:371-390, 1958) to evaluate the nature and type of gene action governing resistance to H. turcicum. The results showed that all types ofgene effects, viz., additive, dominance and epistasis (i.e., additive × additive, additive × dominance and dominance × dominance) were operating in one cross or the other in controlling resistance. However, it was additive gene action and dominance × dominance type of epistasis with duplicate nature that were important in controlling resistance in most crosses. Depending upon the final objectives, one of the breeding methods, viz., recurrent selection, heterosis breeding, back-cross method or full-sib selection (bi-parental mating) may be followed.