In the present study, fifty-two mungbean (Vigna radiata) genotypes were evaluated for seven morphological traits at three different environments in South Indian state Tamil Nadu, namely Virinjipuram (E1), Eachangkottai (E2), and Bhavanisagar (E3) during Kharif 2017, 2018, and 2019, respectively. The data collected were subjected to variability and correlation analyses, followed by stability analysis using additive main effects and multiplicative interaction (AMMI) model, genotype and genotype × environment interaction effects (GGE) biplot. Variablility was observed among the genotypes for the following traits viz., plant height, days to fifty per cent flowering, number of pods per plant, pod length, number of seeds per pod, hundred seed weight and grain yield. Correlation analysis showed that the trait number of pods per plant was significantly associated with grain yield. The G × E was smaller than the genetic variation of grain yield as it portrayed the maximum contribution of genotypic effects (61.07%). GGE biplot showed E3 as a highly discriminating and representative environment. It also identified environment-specific genotypes viz., EC 396111 for E1, EC 396125 for E2 and EC 396101 for E3 environments. The genotypes with minimum genotype stability index (GSI) viz., V2802BG (7), HG 22 (13), and EC 396098 (13) were observed with wide adaptation and high yields across all the three environments. In summary, we identified stable genotypes adapted across environments for grain yield. These genotypes can be used as parent/pre-breeding materials in future mungbean breeding programs.

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Medium duration rice culture CB 99019, a derivative of the cross C 20 / RNR 52147 was released as CO(R) 49 during the year 2008 as an alternative variety for BPT 5204. CO (R) 49 is a semi dwarf, non lodging erect plant type which matures in 135 days. In the overall analyses of 110 yield trials conducted for six years in different locations, it recorded a mean grain yield of 6041 Kg ha-1 which was 6.5 per cent increase over BPT 5204. It is moderately resistant to stem borer, GLH, blast and RTD. It has medium slender white fine rice with an L/B ratio of 2.79 variety. Variety CO(R) 49 has superior cooking quality with intermediate amylose content (23.25%), soft gel consistency and moderate gelatinization temperature. The variety with higher yield, better pests and diseases resistance and superior cooking quality in comparison to the checks, IWP and BPT 5204 is suitable for cultivation during late samba / thaladi season in Tamil Nadu.