Screening at early growth stage for identification of genotypes and physiological traits for salinity tolerance in grain amaranth genotypes
Keywords:
Salinity, speed of germination, root shoot ratio, water content, vigourAbstract
A prominent issue in the world’s arid and semi-arid regions is salinity stress. It severely reduces seedgermination and plant population, which results in a decreased yield. The present investigation was performedfor identification of salt tolerant genotypes and traits conferring salinity tolerance at seedling stage. Tengenotypes of grain amaranthus species were sown at electrical conductivity of 0 dS/m (control), 5 dS/m(moderate stress) and 10 dS/m (high salinity stress). When exposed to salinity stress, the genotype GA-1exhibited the highest germination percentage and speed of germination. Salt Tolerance Index (STI) at 5 dS/m electrical conductivity based on dry weight indicates that GA-1, GA-5, SUVARNA and IC-294449 hadhighest capacity to produce dry matter than other genotypes, with GA-1 maintaining maximum STI athigher salinity level. Root- shoot ratio and water status of seedling tissue were positively correlated atsalinity level of 5 dS/m (0.1691) and 10 dS/m (0.4850). Membership function value (MFV) indicates thesalinity tolerance of the genotypes i.e. higher MFV of a genotype indicates higher tolerance to salinity thanother genotypes. The root shoot ratio was shown to be positively linked with MFV in the current study. Theseedling vigour was positively correlated to MFV at 5 dS/m (0.9472) as well as at 10 dS/m (0.2172). Thecurrent study concludes that genotype GA-1 is relatively more tolerant, and traits like root-shoot ratio,seedling vigour, and seedling water content are important for selection of salinity tolerant genotype at seedlingstage.References
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