Volume 13, Issue 37 (4-2021)                   jcb 2021, 13(37): 213-221 | Back to browse issues page

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Payam Noor University
Abstract:   (376 Views)
In order to determine the most suitable quantitative drought tolerance indices and drought tolerant moldavian balm (Dracocephalum moldavica L.) ecotypes, two experiments (under normal and drought stress conditions) were carried out using randomized complete block design with four replications. In this research, drought tolerance indices such as tolerance index (TOL), stress susceptibility index (SSI), mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HM), stress tolerance index (STI), yield index (YI) and yield stability index (YSI) were calculated using shoot dry weight under non-stress (Yp) and drought stress (Ys) conditions. The results of combined analysis of variance revealed that ecotype, stress and stress × ecotype were significant (p<0.01) in shoot dry weight. Analysis of variance indicated that there were significant differences (p<0.01) between the ecotypes for Yp, Ys, and MP, GMP, HM, STI and YI indices. There were positive significant correlations between MP, GMP, HM, STI and YI with Yp and Ys and so MP, GMP, HM, STI and YI were recognized the most suitable indices for screening the ecotypes. Distribution of ecotypes in biplot graph represented the genetic diversity among ecotypes for selecting them based on drought tolerance and comparison of different moldavian balm ecotypes using multivariate biplot graph indicated that Faridan, Garmsar, Khomeinishahr and Urmia ecotypes are considered as superior ecotypes in both conditions because of locating of these ecotypes next to the vectors of suitable drought tolerance indices. Cluster analysis showed that Faridan, Garmsar, Khomeinishahr and Urmia ecotypes could be suggested as drought tolerant ecotypes.
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Type of Study: Research | Subject: Special
Received: 2021/01/23 | Revised: 2021/06/1 | Accepted: 2021/03/16 | Published: 2021/06/1

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