Studies on indices and morphological traits for drought tolerance in rainfed rice (Oryza sativa L.)
Abstract
The present experiment comprised of 48 rice genotypes was conducted to identify stress-tolerant genotypes under reproductive stage drought stress and controlled conditions during Rabi 2017-18. Drought tolerance indices like stress susceptibility index (SSI), drought tolerance efficiency (DTE), stress tolerance index (STI) and stress tolerance (TOL) and morphological traits responses were employed in screening of the genotypes. Significant yield reduction was observed under drought stress in the majority of the rice genotypes studied. Drought stress at reproductive stage caused a reduction in grain yield (51%), a number of panicles per square metre (15%), panicle length (13%), spikelet fertility (17%), plant height (9%) and harvest index (26%). The variation in SSI values ranged from 0.83 – 1.33, DTE from 36.90-66.67%, STI ranged from 0.39-1.02 and TOL varied from 0.98 -2.97. The genotypes with high DTE and STI and low SSI and TOL were identified as drought-tolerant genotypes. Based on screening, rice genotypes PM 17015 and PM 15048 showed low SSI and TOL and high DTE and STI values were identified as drought-tolerant genotypes. The present study indicates that selection based on stress tolerance indices likes DTE, SSI, STI and TOL will result in the identification of drought-tolerant genotypes for the rainfed ecosystem.
It is certified that:
- The corresponding author is fully responsible for any disputes arising due to the publication of his/her manuscript.
- The article has been seen by all the authors who are satisfied with its form and content.
- The sequence of names of authors in the by-line is as per their relative contribution to this experiment, giving due credit to all scientists who made notable contribution to it.
- All the authors fully understand that inclusion of any other co-authors or exclusion of any co-authors is not possible once the article has been submitted to the journal.
- The corresponding author takes full responsibility for this article.
- The address of the organization where the research was conducted is given.
- The article is exclusive for this journal, and the results reported here have not been sent (and will not be sent during its consideration by this journal) for publication in any other journal.
- Authors agree to abide by the objective comments of referees and do agree to modify the article into a short note as per the recommendation, for publication in the Electronic Journal of Plant Breeding.
- If published in Electronic Journal of Plant Breeding, the copyright of this article would vest with the Indian Society of Plant Breeders, who will have the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in it, and neither we nor our legal heirs will have any claims on royalty.
