AMMI biplot analysis and phenotypic stability for seed yield and its component traits in linseed Linum usitatissimum L under conventional and natural production systems

Abstract

newline The present investigation entitled, AMMI biplot analysis and phenotypic stability for seed newlineyield and its component traits in linseed (Linum usitatissimum L.) under conventional and newlinenatural production systems was undertaken during rabi 2019-20 and rabi 2020-21 to study the GE newlineinteractions for thirty linseed genotypes comprising of advanced breeding lines, elite cultivars and newlineexotic lines across four different locations in Himachal Pradesh with varying altitudes viz., Palampur newlineBajaura, Kangra and Dhaulakuan with two production systems viz., conventional and Zero Budget newlineNatural Farming (ZBNF) at each location. Therefore, the genotypes were evaluated over a total of newlinesixteen environments (sites-years-production systems) for different yield and component traits. newlineStability analysis was carried out using Eberhart and Russell and AMMI model. Pooled analysis of newlinevariance as per both the models revealed significant differences among the genotypes, environments newlineand GE interaction.As per Eberhart and Russell (1966) model the genotype identified as stable for seed newlineyield was Surbhi. None of the genotypes were found stable for primary branches per plant, secondary newlinebranches per plant, capsules per plant, 1000 seed weight and oil content. Whereas, as per AMMI model newlinestable genotypes were identified for all the traits. The most stable genotypes identified with respect to newlineseed yield per plant were Giza-7, KL-278, Him Alsi-2, Janki and KL-279 and the most promising newlinegenotypes for oil content were Nagarkot, KL-257, KL-269, Him Alsi-1 and KL-279. Genotypes newlineidentified stable as per both the models were Him Alsi-2 for plant height, technical plant height and newlineseeds per capsule, KL-285 and Nagarkot for plant height and Himani for harvest index. Genotypes newlineshowing specific adaptations were also identified. For site Palampur genotype Giza-8, for location newlineBajaura Him Palam Alsi-1(KL-241) and KL-311, for Kangra location KL-317 and Surbhi; for site newlineDhaulakuan genotypes KL-236, KL-315 and KL-284 showed specific adaptation under conventional newlinesystem. However, under natural farming system for site Palampur genotypes Baner and KL-285, for newlinesite Bajaura genotype KL-284; genotypes KL-257 and KL-285 for location Kangra and Bhagsu, newlineNagrakot, Him Palam Alsi-2 (KL-263) and KL-284 for site Dhaulakuan showed specific adaptation. newlineHowever, cross-overs were observed across years. Therefore, further evaluation for more years is newlinerecommended. Genotype KL-284 showed consistensy in its rank at location Bajaura under both newlineproduction systems and hence, could be recommended for conventional as well as natural production newlinesystems with respect to site Bajaura. In terms of the environments, natural production system was newlineobserved as unfavourable environment for seed yield due to its consistent poor performance across newlineyears in comparison to the conventional system. It was also identified as poor discriminating newlineenvironment. Genotypes KL-314 and Him Palam Alsi-2 (KL-263) were found to be resistant in all four newlinelocations for both powdery mildew and rust under epiphytotic conditions