Growth and mineral nutrition of six rapid-cycling Brassica species in response to seawater salinity

Abstract

The growth of six rapid-cycling lines of Brassica species, B. napus, B. campestris, B. nigra, B. juncea, B. oleracea and B. carinata was inhibited by seawater salinity. Based on the change in dry matter reduction relative to the control at varying concentrations of salts (4, 8 and 12 dS m-l), the relative salt tolerance of these species was evaluated. B. napus and B. carinata were the most tolerant and most sensitive species, respectively, while the other four species were moderately tolerant. The influence of seawater on the concentrations of 12 elements including macronutrients and micronutrients in the shoots of these Brassica plants was characterized to determine the relationship between nutritional disturbance and relative salt tolerance. It was found that seawater salinity had a significant effect on the concentrations of Ca, Mg, K, CI, Na and total N in the shoots of these plants but only the change in Ca concentration was significantly related to the relative salt tolerance of these six rapid-cycling Brassica species according to a rank analysis of the data. This finding indicates that Ca may play a regulatory role in the responses of Brassica species to saline conditions.

Genetic Diversity Analysis for Salinity Tolerance in Indian Mustard [Brassica juncea (L.)] Using SSR Markers

“…The germination percentage of parental genotypes of CS 52 and RH 30 were 60% and 40% under salinity concentration at 10 dS/m, which was lower than control and treatments. Brassica was classified as moderately salt tolerant with a superiority of amphidiploids species over the diploid species (He and Cramer, 1992). Ashraf and Harris (2004) reported that the amphidiploids species are more salt tolerant as compared to diploid species.…”

Interactive Effects of Sodium and Potassium on the Growth and Photosynthesis of Spinach and Komatsuna

“…In Brassica plants, Na and CI contents in shoot increased but K content in the shoot decreased as the concentration of applied salt increased (He and Cramer, 1992). In komatsuna, a Brassica plant, application of N aCI might increase the N a content and decrease the K content disrupting osmotic regulation resulting in the decrease of water content and fresh weight.…”

Salinity–mineral nutrient relations in horticultural crops

“…This finding provides another example of the negative effect of salinity on root pressure-driven calcium transport to meristematic tissue. Although relative salt tolerance of other Brassica species appeared to be correlated with calcium status (He and Cramer, 1992), subsequent research demonstrated that growth was not improved by increasing Ca 2 supply (Schmidt et al, 1993). Likewise, addition of supplemental calcium had no effect on the salt tolerance of certain lettuce genotypes (Cramer and Spurr, 1986b).…”