Root Na+ Content Negatively Correlated to Salt Tolerance Determines the Salt Tolerance of Brassica napus L. Inbred Seedlings

Abstract

Soil salinization is a major environmental stressor that reduces the growth and yield of crops. Maintaining the balance of ions under salinity is vital for plant salt tolerance; however, little is known about the correlation between the salt tolerance of crops and the ion contents of their roots and shoots. Here, we investigated the poorly understood salt-tolerance mechanisms, particularly regarding ion contents (particularly Na+), in Brassica napus subsp. napus L., an agriculturally important species. Twenty B. napus inbred lines were randomly chosen from five salt-tolerance categories and treated with increasing concentrations of NaCl (0–200 mmol) for this work. We found that the root Na+ content is the most correlated limiting factor for the salt tolerance of B. napus; the higher the salt tolerance, the lower the root Na+ content. Correspondingly, the Ca2+/Na+ and K+/Na+ ratios of the roots were highly correlated with B. napus salt tolerance, indicating that the selective absorption ability of these ions by the roots and their translocation to the shoots play a pivotal role in this trait. These data provide a foundation for the further study of the molecular mechanisms underlying salt tolerance and for breeding salt-tolerant B. napus cultivars.

Unravelling the Morphological, Physiological, and Phytochemical Responses in Centella asiatica L. Urban to Incremental Salinity Stress

“…The leaves of centella are usually harvested, which is advantageous for growing this plant in saline environments. This mechanism has also been reported in amaranth [ 36 ] and rapeseed [ 51 ].…”

High throughput phenotyping of functional traits and key indices for selection of salt tolerant Mustard [Brassica juncea (L.) Czern & Coss] genotypes

“…There was a significant negative association of seed yield STI with RNa indicating that RILs with low Na + concentration have high seed yield (Table S7 and Figure 5). These results are in favour of (Priya et al, 2021;Wang et al, 2022) which stated that seed yield negatively associated with the Na + concentration of different plant parts. STI of YPP showed a positively significant association with yield attributing traits STI viz., MSL, NSPP, TW, PH, SPS, SL, PBr, and SBr and growth attributing traits STI viz., USFW, BrFW, BLFW, and MLFW and photosynthetic traits STI viz., Pn, inWUE indicating that by improving these traits seed yield will be increased.…”

AtCIPK16, a CBL-interacting protein kinase gene, confers salinity tolerance in transgenic wheat

“…Additionally, Khan et al. (2020) and Wang et al. (2022) proposed the exclusion of Na + ions out of the plasma membrane or Na + sequestration into the vacuole and activation of the antioxidant defense system in plant cells for the generation of salt tolerance.…”