Heritability of rust resistance and agronomic traits in peanut (Arachis hypogaea L.)
1997
Wisit Trisuvanwat | Sanun Jogloy | Aran Patanothai | Sopone Wongkaew
Rust (Puccinia arachidis Speg) is one of the economic diseases of peanut (Arachis hypogaea L.). Yield loss due to this disease is ranged from 10-85 percent. Host plant resistance is one of the most effective method to control of the disease. Information on heritability of rust resistance and agronomic traits is necessary in order to formulate the selection of segregating material. The objective of this study was to estimate heritabilities of rust resistant parameters and agronomic traits. The experiment was conducted at Field Crop Section, Faculty of Agriculture, Khon Kaen University in the 1991 rainy season. The experimental design was Randomized Complete Block Design (RCBD) with 4 replications. Breeding materials including 4 crosses in F2 generation, 4 back crosses to male parents, 4 backcross to female parents and parents were planted for evaluation of disease resistance and agronomic traits. Disease score and lesion size were record as disease resistant parameters and agronomic traits including pod number per plant, pod length, pod weight per plant, seed weight per plant, seed size and shelling percentage were also record. Narrow sense heritabilities of disease resistant parameters and agronomic traits were estimated. The results revealed that heritabilities of disease score and agronomic traits were low however heritability of lesion size was high. The results indicated that selection of single plant in F2 generation on the lesion size was effective but selection of agronomic traits was ineffective. Selection of agronomic traits should be done in the late generation.
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