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

Published online by Cambridge University Press:  13 June 2016

Zeeshan Khan Open the ORCID record for Zeeshan Khan [Opens in a new window] ,
Javaria Qazi ,
Awais Rasheed  and
Abdul Mujeeb-Kazi
Zeeshan Khan
Affiliation:
Department of Biotechnology, Quaid-i-Azam University, Islamabad, Pakistan
Javaria Qazi*
Affiliation:
Department of Biotechnology, Quaid-i-Azam University, Islamabad, Pakistan
Awais Rasheed
Affiliation:
Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing 100081, China International Maize and Wheat Improvement Center (CIMMYT), c/o CAAS, Beijing 100081, China
Abdul Mujeeb-Kazi
Affiliation:
University of Texas A&M, Amarillo, TX 79106, USA
*
*Corresponding author. E-mail: [email protected]
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Abstract

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.

Keywords

Aegilops tauschiigermination testsalinity stresssalt tolerance indexsynthetic hexaploid wheats
Type
Research Article
Information
Plant Genetic Resources , Volume 15 , Issue 6 , December 2017 , pp. 488 - 495
Copyright
Copyright © NIAB 2016 

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