Abstract
Although the effect of salinity on plants is well established, yet evaluating genetic variation in yield-related traits under salinity stress remains useful. This study was conducted to investigate the genetic variation within and between two subgroups of durum wheat in Jordan, i.e., cultivars and landraces, in germination and root architectural traits at three salinity concentrations (50, 100 and 150 mM NaCl). The results indicate that salinity significantly impacted most traits investigated. A multivariate discriminant analysis (DA) revealed large variations (~85%) between genotypes, with significant ranking in maximum root length, total root length, seminal root length, coleoptile length, germination percentage, and total and seminal root number over the three salinities. Within the cultivar subgroup, salinity significantly influenced the germination percentage and most root traits of durum genotypes, with variable magnitudes depending on NaCl concentration and within-variety intraspecific genetic variation (ANOVAs; p < 0.05). However, within the landrace subgroup, only a salinity of 150 mM NaCl significantly affected the studied traits, and the effect of salinity on germination percentage was highly genotype dependent. Additionally, the durum genotypes in the landrace subgroup were more affected by salinity and showed more genetic variation than those in the cultivar subgroup.
Highlights
The effect of salinity on plants growth and developmental processes, such potential conflict of interest
The seeds of the studied genotypes of durum wheat were obtained from the National Center for Agricultural Research and Extension (NCARE) of Jordan
Results and Discussion results of a discriminant analysis (DA) of the germination and root architectural traits for all genotypes of durum wheat subjected to different salinities
Summary
The seeds of the studied genotypes of durum wheat were obtained from the National Center for Agricultural Research and Extension (NCARE) of Jordan. Durum wheat (Triticum turgidum L. iments of a few days to a week in duration seeds were placed into Petri dishes spp. durum Desf.) is a tetraploid grass with have been favored to identify salt-tolerant (100 mm in diameter) containing two pieces nutritional value for humans. This crop was genotypes by comparing differential of filter paper and moistened with disoriginally domesticated in the Fertile responses in controlled saline and non- tilled water or with one of the NaCl solu-.
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