Evaluating resistance to drought stress in fluecured tobacco varieties via stress susceptibility indexes in dry farming condition
Journal Title: International Journal of Farming and Allied Sciences - Year 2014, Vol 3, Issue 4
Abstract
The evaluate of resistance indices to post anthesis water deficit can help to identify strategies for selection of resistant cultivars of Tobacco (Nicotiana tabacum L.) and increased crop yield production. an experiment was conducted in a factorial experimental on the basis of randomized complete block design under two irrigated conditions during 2010-2011 cropping season. Five drought tolerance/resistance indices including stress tolerance index (STI), stress susceptibility index (SSI), tolerance index (TOL), geometric mean production (GMP), mean production (MP) were calculated based on leaf weight yield under drought and irrigated conditions. The leaf weight yield in stress and non-stress conditions were significantly and positively correlated with STI, TOL,GMP, MP, and negatively correlated with SSI. Screening drought tolerant cultivars using ranking method, three dimensional plots discriminated cultivars ‘K 394’, N.C 95, Previ stamm 9’ and Tirtash 30 as the most drought tolerant. Cluster analysis classified the cultivars into three groups i.e., tolerant, susceptible and semi-susceptible to drought conditions. In general, Results of this study showed that among drought tolerance indices STI can be used as the most suitable indicators for screening drought tolerant cultivars and ‘K 394’, N.C 95, Previ stamm 9 , and Tirtash 30 had the highest tolerance to drought in our studies condition.
Authors and Affiliations
R Ali Nezhad Seraji, H Najafi Navaey, SA Oulad Ali and H Eslami
Keywords
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