Growth attributes, biochemical modulations, antioxidant enzymatic metabolism and yield in Brassica napus varieties for salinity tolerance

Abstract

Improvement in salinity tolerance of plants is of immense significance as salt stress particularly threatens the productivity of agricultural crops. This study was designed to assess the tolerance level of six Brassica napus varieties (Super, Sandal, Faisal, CON-111, AC Excel and Punjab) under different levels of salinity (0, 50, 100, 150 & 200 mM) with three replications under CRD. Salt induced osmotic stress curtailed the plant growth attributes, photosynthetic pigments and disturbed ionic homeostasis (K + , Na + , Ca 2+, Cl - ) but least disturbance as compared to control was found in Super and Sandal cultivars. Punjab canola and AC Excel canola cultivars were least tolerant to salinity because these displayed greater decline in all growth and biochemical attributes. Plants subjected to NaCl induced stress exhibited considerable decline in all attributes under study with proline as exception. Antioxidants (CAT, SOD & POD) showed an obvious change in Canola plants under stress, but greatest decline was displayed at 200 mM NaCl level in all six cultivars. Over all these attributes presented a comparatively stable trend in super and sandal cultivars. This shows presence of physiological resilience and metabolic capacity in these two cultivars to tackle salinity. Similarly, all yield attributes displayed adverse behavior under 150 mM & 200 mM salinity stress. Our results demonstrated that Super and Sandal cultivars of Brassica napus exhibit good performance in salinity tolerance and can be good option for cultivation in salt affected areas.

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

“…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. These results are in agreement with different previous research: for yield attributing traits by (Naheed et al, 2021); growth attributing traits by (Jia et al, 2020), and photosynthetic traits by (Mohamed et al, 2020) conducted in different Brassica spp.…”

“…Most of the crops exposed to the salinity experienced decreased growth. Hence, the detrimental effects of salinity might be due to ion toxicities, ion imbalance, or a combination of all these mechanisms (Naheed et al, 2021).…”

Oilseed Brassica Responses and Tolerance to Salt Stress

“…The ecotypes were Super, Sandal, Faisal, CON-111, AC Excel, and Punjab, among which the number of pods per plant was reduced significantly under 150 mM NaCl in Punjab cultivar. Also, a similar trend in reduction was observed for 1000-seed weight in the same cultivar with increasing salt concentration, while the other varieties showed little to no response regarding those attributes [98].…”

Azolla filiculoides extract improved salt tolerance in wheat (Triticum aestivum L.) is associated with prompting osmostasis, antioxidant potential and stress-interrelated genes

“…The increased activity of these enzymes has been reported to improve the growth of stressed plants by safeguarding chloroplasts and other organelle structures, wherein the key biological activities happening 53 . The documented slight decline in SOD activity by salt treatment was observed in six canola genotypes by 54 . This implies that persistent stress reduces SOD activity and makes the detoxification of AOS more challenging.…”