Evaluation of blackgram [Vigna mungo (L.) Hepper] genotypes for salinity tolerance at the seedling stage

Salinity is a significant environmental stress limiting factor in blackgram (Vigna mungo) production, necessitating the identification of saline-tolerant genotypes for sustainable cultivation. This study was conducted at the National Pulses Research Centre (NPRC), Vamban, in 2019 and 2020 to test the tolerance of blackgram genotypes to salinity under a hydroponic system. The experiment was laid out in a randomised complete block design with two replications. Five genotypes were initially tested at salt levels ranging from 11 to 15 dSm-1 and 13 dSm-1 was identified as the critical level for screening. 100 blackgram genotypes were subsequently evaluated at 13 dSm-1, which led to the identification of seven highly saline-tolerant genotypes. Further validation trials were conducted using these seven VBN 8 genotypes and two susceptible checks (VBN 6 and CO 6). The results confirmed that five genotypes viz., ACM BG 14–001, VBG 18–071, VBG 18–080, VBG 19–005 and VBG 19–010, exhibited strong tolerance to salinity, with survival rates exceeding 75% at 13 dSm-1. These genotypes may be tested in saline-affected areas for potential release as a new variety. Additionally, they can serve as donors in breeding programs for saline tolerance. This study’s findings contribute to identifying resilient genotypes that may enhance productivity in salt-affected soils and ensure food security.