数字农科院2.0

Diversity in D-genome synthetic hexaploid wheat association panel for seedling emergence traits under salinity stress

文献类型： 外文期刊

作者： Khan, Zeeshan;Qazi, Javaria;Rasheed, Awais;Rasheed, Awais;Mujeeb-Kazi, Abdul

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关键词： Aegilops tauschii;germination test;salinity stress;salt tolerance index;synthetic hexaploid wheats

期刊名称： PLANT GENETIC RESOURCES-CHARACTERIZATION AND UTILIZATION

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收录情况： SCI

摘要： Seedling emergence is the preliminary factor defining wheat adaptability and stability under salt stress. This study was led to assess the salinity tolerance amongst 226 synthetic hexaploid wheats (SHWs) evaluated against two check cultivars, the tolerant S-24' and the susceptible PBW-343' at three sodium chloride treatments (0, 100 and 200 mM). Highly significant and positive correlation was observed between germination % and germination index (r = 0.85), and between seedling height and weight (r = 0.85). All four traits across three treatments were transformed into the salt tolerance trait index and salt tolerance index (STI). STI had significant positive correlation with all four parameters indicating reliability of this index for ranking the tolerance levels. STI-based 20 best performing genotypes were known as being promising candidates for wheat breeding. Local tolerant check was amongst the top three tolerant accessions. Two SHWs, AUS30288 {Croc_1/Aegilops squarrosa (466)} and AUS34444 {Ceta/Ae. squarrosa (872)} outperformed S-24 with STI of 61.8 and 55.7, respectively. SHW with same durum parents were included in tolerant and susceptible categories indicating that tolerance is contributed by the Ae. squarrosa syn. tauschii parent of SHWs. In conclusion, this baseline study revealed that continuous variation in the seedling emergence traits under salt stress is a conduit towards implementing genome-wide association studies. Likewise, new diversity has implications in development of salt tolerance germplasm after genetic dissection permitting unique Ae. squarrosa accessional diversity validation to target SHW donors for breeding.

分类号： Q3

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