[Home ] [Archive]   [ فارسی ]  
:: Main :: About :: Current Issue :: Archive :: Search :: Submit :: Contact ::
Main Menu
Home::
Journal Information::
Articles archive::
For Authors::
For Reviewers::
Registration::
Contact us::
Site Facilities::
::
Search in website

Advanced Search
..
Receive site information
Enter your Email in the following box to receive the site news and information.
..
:: Volume 15, Issue 3 (10-2013) ::
علوم زراعی 2013, 15(3): 222-233 Back to browse issues page
Contribution of pollen grain osmoregulation, relative water content and stomata density on drought tolerance in 40 bread wheat (Triticuma estivum L.) cultivars
Abstract:   (4108 Views)
The contribution of physiological traits such as osmoregulation capability of pollen grain, relative water content (RWC) and stomata density in flag leaf area to drought tolerance of 40 bread wheat cultivars was studied. To evaluate their effect of these traits on grain yield, two separate field experiments were designed and conducted in2010 at experimental farm of college of agriculture, Kerman Shahid Bahonar University, Kerman, Iran using randomized complete block design with three replications. Osmoregulation capability of pollen grain was simulated using the ratio of projected pollen grains area under water stress to normal conditions in solutions containing 50% and 30% polyethylen glycol (PEG) 6000, respectively. Analysis of variance showed that the effect of drought stress and cultivar on grain yield and physiological traits were significant. Drought stress decreased grain yield by %33 and RWC by%15.4, but increased stomata density of flag leaf area by %21. Osmoregulation capability of pollen grain in Azar-2, Dez, Azadi, Hamoon, Karaj-3, Sabalan and Omid was greater than one, therefore these cultivars were identified as capable cultivars for osmoregulation. Osmoregulation capability of pollen grain showed highly significant correlation with grain yield under stress conditions (r=0.41**). Thus, this mechanism directly contributed to increasing grain yield under drought stress. Stress Tolerance Index (STI) was also used for identification of drought tolerant genotypes. Based on this index, cv. Azar-2 was identified as the most drought tolerant genotype. This cultivar had also the highest osmoregulation capability. It can be concluded that pollen grain osmoregulation is a likely mechanism contributing to drought tolerance of cv. Azra-2.
Keywords: Bread wheat, Drought stress, Physiological traits, Stomata density and Stress tolerance index
Full-Text [PDF 535 kb]   (1854 Downloads)    
Type of Study: Scientific & Research | Subject: Special
Received: 2015/02/16 | Accepted: 2015/02/16 | Published: 2015/02/16
Add your comments about this article
Your username or Email:

CAPTCHA


XML   Persian Abstract   Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Contribution of pollen grain osmoregulation, relative water content and stomata density on drought tolerance in 40 bread wheat (Triticuma estivum L.) cultivars. علوم زراعی 2013; 15 (3) :222-233
URL: http://agrobreedjournal.ir/article-1-55-en.html


Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Volume 15, Issue 3 (10-2013) Back to browse issues page
نشریه علوم زراعی ایران Iranian Journal of Crop Sciences
Persian site map - English site map - Created in 0.04 seconds with 37 queries by YEKTAWEB 4645