Evaluation and screening of elite wheat germplasm for salinity stress at the seedling phase

Abstract

Salinity is one of the most important constraints for global cereal production, and breeding for salinity tolerance is a challenge. The limited gene pools, merged information regarding osmotic stress/tissue tolerance mechanism(s) including the accumulation of Na + , over-stressed on the Na + exclusion mechanism, and inadequate suitable screening methods further weaken the progress. In the present study, an attempt was made to evaluate the salt tolerance in Triticum aestivum lines using the membership function value (MFV) of certain traits viz., the root and shoot length (RL & SL), shoot and root fresh weight (SFW & RFW), shoot and root dry weight (SDW & RDW) and germination percentage (GP). This study screened 314 wheat lines (278 linked top cross population [LTPs] and 36 normal wheat cultivars) under lab conditions to evaluate their salt tolerance. A positive, and the highest, correlation coefficient was recorded between salt tolerance index (STI) of SL and the STI of RL.0.11 highly salt tolerant (HST), 59 salt tolerant (ST), 100 moderately salt tolerant (MST), 137 salt sensitive (SS), and seven highly salt sensitive (HSS) were observed with a distance of 2.2 between each category. The R-square value was maximum (0.836) between the STI of SFW and the mean MFV, which can be used as the most reliable trait for the salinity tolerance in T. aestivum at the germination phase. Wheat tolerant lines had higher tolerance to salt stress in comparison with the used normal wheat cultivars were detected at the seedling stage.

Higher Temperature had Positive Effects on Seed Germination of Glycyrrhiza glabra under NaCl Stress

“…The membership function value can reflect the stress degree that the seeds suffered. The larger the MFV, the smaller the influence caused by salt stress and the stronger the salt tolerance of a plant (Choudhary et al, 2021).Higher temperature corelated with higher mean MFV (GP, GI and VI, Table 2) and G. glabra salt tolerance was enhanced with increased temperature. Therefore, sowing in summer during…”

“…The subordinate function values of all seed salt resistance indexes at each temperature are added to the average according to the determined seed salt resistance at different temperatures. The MFV reflects the seed stress degree; the larger the MFV, the smaller the influence caused by salt stress and the stronger the plant's salt tolerance (Choudhary et al, 2021).…”

A comprehensive approach for evaluating salinity stress tolerance in brinjal (Solanum melongena L.) germplasm using membership function value

“…The brinjal germplasm lines salt tolerance levels were evaluated using the fuzzy comprehensive evaluation method using the membership function value (MFV) (Wu et al, 2019, Li et al, 2020, Choudhary et al, 2021. The MFV for salt tolerance was calculated using the following equation:…”

Indian Wheat Genomics Initiative for Harnessing the Potential of Wheat Germplasm Resources for Breeding Disease-Resistant, Nutrient-Dense, and Climate-Resilient Cultivars

“…Although, most of the affected parameters were known for salt tolerance which limits productivity, inadequate large-scale phenotyping could be a possible factor for a significant outcome ( El-Hendawy et al, 2005 ; Rosenqvist et al, 2019 ). Finding well-studied genes/transcription factors from wheat germplasm like AVP1, NHX2, DREB, and SHN1 and their associated marker ( Díaz De León et al, 2010 ; Goyal et al, 2016 ; Singh A. K. et al, 2018 ; Kumar et al, 2020c ) for the utilization for tolerance breeding could be a sustainable approach for generating salt-tolerant wheat genotypes ( Choudhary et al, 2021 ). Hence, there is a compelling need to develop salt-tolerant wheat varieties.…”