Grain yield stability of promising proso millet (Panicum miliaceum L.) genotypes for hilly region of Nepal
Abstract
Identification of genotypes with a high potential for yield and stability across environments is an essential task in plant breeding. The experiments were conducted in three consecutive years viz 2017, 2018 and 2019 during spring seasons across two locations viz Dolakha; and Jumla using 13 proso millet genotypes in Nepal. Proso millet genotypes were evaluated in randomized complete block design with three replications. The objectives of this study were to analyze yield stability and adaptability of proso millets genotypes and to evaluate the discrimination and representativeness of locations by genotype and genotype by environment interaction (GGE) biplot methods. The significant genotypes and genotypes and their interaction (P<0.05) were observed for day to maturity, plant height and grain yield which indicated the presence of difference among the genotypes. The combined analysis over environments showed that the average values of days to maturity was 118 days, plant height of 112 cm and grain yield of 0.429 t/ha. The genotypes CO4656 had mean yield 0.495 t/ha which was higher than the overall mean (0.429 t/ha), parameter of response (b)=1.16 and parameter of stability (S2di)=0.05. This genotypes could be represented as stable and widely adapted across tested environments. The genotype CO3149 was specifically adapted to favourable environment of Jumla because its regression coefficient was significantly more than unity (b=1.25) mean yield is higher (0.478 t/ha) than the average (0.429 t/ha) and S2di was nearly zero (0.101). Similarly genotype HUMLA-312 was specifically adapted to Dolakha environment because its regression coefficient was significantly more than unity (b=1.14), mean yield was higher (0.451 t/ha) than the average (0.429 t/ha) and S2d was nearly zero (0.140). GGE biplot showed genotype CO4656 was stable genotype under tested environments.
Keywords
Prosomillet (Panicum miliaacum L)
Thanks
The authors would like to provide their thanks to technical staffs of Hill Crops Research program (HCRP), Kabre, Dolakha, and Agricultural Research Station (ARS), Bijayanagar, Jumla, Nepal for their technical support to carry out this study. The funds for this research was received from Nepal Agricultural Research Council, Nepal
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