Combining ability of late leafspot resistance and agronomic traits in peanut (Arachis hypogaea L.)
2000
Jogloy, S. | Kormsa-art, T. | Wongkaew, S. | Lertrat, K. (Khon Kaen Univ., Khon Kaen (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Late leafspot (Cercosporidium personatum) is one of the most serious disease of peanut. Although fungicide treatment is effective to control the disease, its high cost is considered uneconomical in many developing countries. In this situation, the use of resistant cultivars offers a better alternative. The objective of this study was to determine the combining ability for resistance to late leafspot and agronomic traits. Four resistant cultivar and four adapted lines were crossed in M x N mating design. Sixteen F2 progenies were generated and evaluated for late leafspot resistance and agronomic traits. The results indicated that additive gene was important for resistance to the disease and agronomic traits. Non-additive gene was less important for resistant traits; however, it was important for pod weight, seed weight, and pods per plant. The GCA effects reveal that ICG 17 was the best parent for improvement of late leafspot resistance., however, it produced progenies with poor agronomic traits. Tainan 9, Lampang, NCAc 17090 and RLRS-15 are also suitable parents for both resistance and agronomic traits.
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