Identification of rice genotypes for seedling stage multiple abiotic stress tolerance
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ORIGINAL ARTICLE
Identification of rice genotypes for seedling stage multiple abiotic stress tolerance Tinu Thomas1 • J. Purushothaman1 • R. Janarthanan1 • N. Anusuya1 • Prasanna Geetha Medisetti1 • J. Karthick1 • S. Nadaradjan1 • S. Thirumeni1
Received: 30 September 2020 / Accepted: 20 November 2020 Ó Indian Society for Plant Physiology 2020
Abstract Under changing climatic conditions, crops are expected to experience combination of abiotic stresses rather than challenged by a single abiotic stress and hence, breeding for specific abiotic stress tolerance is unavailing. Exposure of crops to abiotic stress during seedling stage leads to poor crop establishment due to early death of seedlings. Hence, tolerance to multiple abiotic stress at seedling stage is imperative for breeding crops. Therefore, there is a need to identify donors for multiple abiotic stress tolerance in rice. Our study aimed at identifying rice genotypes which has multiple abiotic stress tolerance particularly for salinity, drought and heat stress, the most common abiotic stresses under tropical condition. We
& S. Nadaradjan [email protected] Tinu Thomas [email protected] J. Purushothaman [email protected]
hypothesis that since abiotic stress tolerance mechanism involves multi-layered regulatory networks, identifying genotypes conferring tolerance through overlapping mechanisms across different abiotic stress might be a multiple abiotic stress tolerant genotype. An important adaptive mechanism for stress tolerance is high root to shoot ratio and this physiological trait has been used as a criterion for tolerance. Twelve rice genotypes were grown under induced water deficit, salinity and high temperature conditions and seedling growth parameters were recorded. Root shoot ratio on length basis was derived from the recorded parameters and the data was normalized by Z distribution and plotted using scatter plot across stresses. KR15058 and KR15007 were identified as the seedling stage multiple abiotic stress tolerant lines by scatter plot analysis. These lines are promising source for the crop improvement programme for developing a multiple stress tolerant genotype with superior agronomical background. Keywords Climate change Drought Heat Salinity Root shoot ratio
R. Janarthanan [email protected] N. Anusuya [email protected]
Introduction
Prasanna Geetha Medisetti [email protected]
Rice (Oryza sativa L.) is one of the foremost important staple food crop and consumed by more than half of the world’s inhabitants (Wakte et al. 2017). The global production of rice is 7.69 million tonnes, with India being the second largest producer (Indiastat 2017). The enormous increase in global population along with the continuous decline of arable land, shortage of fresh water and rising environmental stress pose serious threat to global food production (Abberton et al. 2016). Globally, stresses affect about 90% of arable land (Dos Reis et al. 2012) and leads
J. Karthick [email protected] S. Thiru
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