Abstract
Salinity is a major and complex abiotic stress that inhibits plant growth and reduces crop yield. Given the global increase in soil salinity, there is a need to develop salt-tolerant species. Brassica napus L. is an important oilseed crop with some level of salt tolerance. However, few studies have evaluated its salt tolerance thoroughly or screened for traits that can be reliably evaluated for salt tolerance. Here, we evaluated salt tolerance in 549 B. napus inbred lines with different genetic backgrounds using the membership function value (MFV) of certain traits, including the germination rate, root and shoot length, root and shoot fresh weight, and total fresh weight. According to the evaluation criteria-mean MFV, 50 highly salt-tolerant, 115 salt-tolerant, 71 moderately salt-tolerant, 202 salt-sensitive, and 111 highly salt-sensitive inbred lines were screened at the germination stage. We also developed a mathematical evaluation model and identified that the salt tolerance index of shoot fresh weight is a single trait that reliably represents the salt tolerance of B. napus germplasm at the germination stage. These results are useful for evaluating and breeding salt-tolerant B. napus germplasm.
Highlights
Salinity is a major abiotic stress that inhibits plant growth and reduces crop yield (Kumar et al, 2010; Tavakkoli et al, 2011)
For root fresh weight (RFW), Shoot length (SL), root length (RL), and Total fresh weight (TFW), the concentration of NaCl which led to a 50% decrease in the Salt-injury index (SII) was 156.1, 133.2, 175.7, and 175.9 mmol L−1, respectively
50 highly salt tolerant (HST), 115 salt tolerant (ST), 71 moderately salt tolerant (MST), 202 SS, and 111 highly salt sensitive (HSS) of B. napus inbred lines were screened during the germination stage
Summary
Salinity is a major abiotic stress that inhibits plant growth and reduces crop yield (Kumar et al, 2010; Tavakkoli et al, 2011). About 800 million hectares of farmland are affected by salinization worldwide (Cramer et al, 2011). The ability of the plant to survive and complete its life cycle under saline conditions is dependent on its salt tolerance, which varies among different species and growth stages The best way to use saline soil is to screen for and develop salt-tolerant crop species and varieties (Ghoulam and Fares, 2001; Ashraf et al, 2012). Salinity stress results in osmotic stress, ion toxicity, and nutritional imbalances (Jones and Gorham, 2002), which reduces growth and alters the levels of cell metabolites (Rhodes et al, 2002)
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