Elucidating morpho‐anatomical, physio‐biochemical and molecular mechanism imparting salinity tolerance in oats (Avena sativa)

Soil salinization drastically affects crop growth, development and yield. In order to tackle salinity, knowledge about stress tolerance mechanism is important to expedite the development of salt‐tolerant cultivars. In this study, 20 oat genotypes consisting of 11 cultivated and nine wild Avena speci...

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Bibliographic Details
Published in:Plant breeding 2021-10, Vol.140 (5), p.835-850
Main Authors: Kumar, Neeraj, Anuragi, Hirdayesh, Rana, Maneet, Priyadarshini, Parichita, Singhal, Rajesh, Chand, Subhash, Indu, Sood, Vinod Kumar, Singh, Sultan, Ahmed, Shahid, Saranga, Yehoshua (Shuki)
Format: Article
Language:English
Subjects:
Avena sativa
Chlorophyll
Crop growth
Cultivars
gene expression
Genetic diversity
Genotypes
Hydroponics
Na+/H+-exchanging ATPase
oat
Plant breeding
potassium sodium ratio and molecular diversity
Potassium transporter
Salinity
Salinity effects
Salinity tolerance
Salinization
Salt tolerance
Salts
Sodium
Sodium chloride
Sodium sulfate
Soil salinity
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Summary:Soil salinization drastically affects crop growth, development and yield. In order to tackle salinity, knowledge about stress tolerance mechanism is important to expedite the development of salt‐tolerant cultivars. In this study, 20 oat genotypes consisting of 11 cultivated and nine wild Avena species were evaluated at different levels of salinity with 1:1 NaCl and Na2SO4 salts mixtures under hydroponics and pot experimental set‐up. Drastic reduction was observed in chlorophyll, relative water and K+/Na+ contents, along with yield traits in sensitive genotypes (HFO‐103, Kent and JHO‐2000‐4) when compared with tolerant (HJ‐8, JHO‐99‐2, HFO‐873 and HFO‐878) under elevated salinity. Root anatomical section studies were also critical to screen salinity tolerance among the oat genotypes. Furthermore, the effect of salinity at the transcriptomic level resulted in upregulation of sodium/hydrogen exchanger and potassium transporter genes along with WRKY17 transcription factor, regulating the signalling and osmotic roles in tolerant genotypes (HJ‐8 and HFO‐873). The identified salt‐tolerant oat genotypes reflected wide genetic diversity using SSR markers which can serve as a crucial donor for salt tolerance in oat breeding programmes.
ISSN:0179-9541
1439-0523
DOI:10.1111/pbr.12937