Soil salinity and mechanical obstruction differentially affects embryonic root architecture in different rice genotypes from West Bengal

Autor: Arun Lahiri Majumder, Sonali Sengupta, Arindam Roy, Priyanka Das, Sanghamitra Adak, Abhishek Mukherjee
Rok vydání: 2019
Předmět:
Zdroj: Plant Physiology Reports. 24:192-209
ISSN: 2662-2548
2662-253X
Popis: Making the first contact with the soil environment, roots are the first responders of soil borne stress including nutrient and water scarcity, hyper salinity and soil compactness. Embryonic root responds by bending, twisting, foraging and regulation of lateral root initiation. Traditional rice cultivars adapted to diverse topography harbour novel stress tolerance traits. We established a quantitative measurement coefficient termed stress adaptation coefficient (SAC) dependent on root responses to stress and applied it to study the effect of mechanical stress and salinity on roots of rice genotypes collected all across West Bengal, India. The responses of root to mechanical and salinity stress are overlapping. Analysis of the response of roots by means of SAC in 28 rice cultivars including high-yield salt tolerant varieties as well as geographically isolated native rice genotypes shows that many of the salt tolerant varieties also perform better in mechanical stress while the opposite is not always true. Transcriptome analysis through cDNA microarray of stress sensitive variety IR64 shows about 6000 common transcripts to be differentially regulated among the two stresses. Quantitative real time expression analyses of salt sensitive and known salt tolerant varieties reveal the involvement of identified genes in salinity and mechanical stress. Overall, our study indicates that there is an important commonality in the molecular basis of salt and mechanical stress and presents an easy-to-perform early establishment stress screen for rice genotypes.
Databáze: OpenAIRE
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