PJB-2018-1766
Salinity response of some amphidiploids species of Brassica (Brassicaceae) at seedling and maturity stages
M.U. Shirazi, R.U. Ansari, M.A. Khan, Syeda Saleha Tahir, Muhammad Tahir Rajput, Aisha Shereen and Muhammad Ali
Abstract
Studies were conducted to evaluate salt tolerance in some amphidiploids species of Brassica (Family: Brassicaceae) at seedling stage (under gravel culture) and at maturity (under saline field conditions). Ten locally adopted genotypes of Brassica (five genotypes of Brassica napus and five of Brassica juncea) were collected from NIA, Tandojam, NIFA Peshawer and ARI Tandojam. Three treatments were imposed (i.e. control, 6.0 and 9.0 dS/m NaCl). It was observed that at early seedling stage the genotypes Early raya & Toria selection of Brassica juncea species and Waster & Dunckled of Brassica napus species had better response to NaCl stress. The better performance of these genotypes under salinity stress might be due to their better osmotic adjustment. The genotype NIFA raya and Durr-e-NIFA of Brassica juncea and Brassica napus species were found more sensitive to NaCl stress, respectively. The physiological studies with respect to osmotic adjustment showed that almost all the genotypes had enhanced proline accumulation however in tolerant genotypes the relative increase (%) was higher. It was also observed that the tolerant genotypes had high K/Na ratio as compared to sensitive ones. The genotypes were also evaluated under natural saline field conditions, where salinity ranged from medium to very high (i.e. 8-16 dS/m). In the field no growth was observed above15 dSm-1. Observation recorded in terms of plant height, number of branches plant-1, number of slique plant-1, slique length, grain wt plant-1, grain yield plot-1 and 100 grain wt., showed that among Brassica juncea genotypes, Early raya had < 50% decrease under saline condition in all the growth parameters followed by Sultan raya having < 50% reduction in 7 growth parameters. Whereas, among the Brassica napus genotypes Waster and Abaseen-95 performed better, showing < 50% decrease in all the growth parameters under saline field conditions. Based on these studies it is concluded that Early raya and Waster are the suitable genotypes to perform better under saline field conditions
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