Volume 25, Issue 2 (6-2012)                   3 2012, 25(2): 252-263 | Back to browse issues page

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Abstract:   (3485 Views)
Drought stress is one of the most important factors in arid and semiarid regions that lead to disorder in growth and development of plants especially at germination stage. Because of importance of safflower as an oil and therapeutic crop, achieving to genotype(s) that be capable of the drought stress at initiating growth stage is necessary. For this purpose, germination and plantlet growth of 10 genotypes were tested in drought stress conditions at four levels including 0 (control), -4, -8 and -12 Bar using PEG6000. This experiment was conducted at laboratory of Agronomy and Plant Breeding Department of Razi University in 2006-2007 as a factorial design in randomized complete block design (RCBD) with three replications. Traits that were studied including: percentage of final germination (FG), germination rate index (PI), germination stress index (GSI), rootlet length (RL), shootlet length (SL) and dry weight of shootlet and rootlet. Data were subjected to variance analysis and mean comparison. Results indicated that in most considered traits, effect of potential levels of genotypes and their interaction were significant. Rootlet length had more sensitive than other traits to decreasing of water potential, hence, root length were increased in these conditions. Also, there was observed a positive and significant correlation among the traits: GSI (0.71<sup>**</sup>), PI (0.41<sup>**</sup>) and SL. Thus, by these traits, can be attempt to selection of tolerant cultivars. In general, results represented that considerable genetic diversity is occur among genotypes. Regarding the studied traits, &quot;Zarghan 279&quot; genotype had been high tolerance to drought stress at germination stage, &quot;Varamin 295&quot; and &quot; IL-111&quot; had been low tolerance.
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Type of Study: Research |
Received: 2016/12/25 | Published: 2012/06/15