Response of Wheat Genotypes to Terminal Drought Stress Using Physiological Indices
In order to study the effect of terminal drought stress on yield and yield components and some physiological traits of wheat genotypes, a field experiment was conducted at the Research Farm of Agricultural College of Shiraz University during 2010-11 growing season in a split plot arrangement based o...
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| Format: | Article |
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Isfahan University of Technology
2013-10-01
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| Series: | Tulīd va Farāvarī-i Maḥṣūlāt-i Zirā̒ī va Bāghī |
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| Online Access: | http://jcpp.iut.ac.ir/browse.php?a_code=A-10-1-93&slc_lang=en&sid=1 |
| _version_ | 1818234099713703936 |
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| author | M. J. Ahmadi Lahijani Y. Emam |
| author_facet | M. J. Ahmadi Lahijani Y. Emam |
| author_sort | M. J. Ahmadi Lahijani |
| collection | DOAJ |
| description | In order to study the effect of terminal drought stress on yield and yield components and some physiological traits of wheat genotypes, a field experiment was conducted at the Research Farm of Agricultural College of Shiraz University during 2010-11 growing season in a split plot arrangement based on randomized complete block design with three replications. Main plots were assigned to irrigation treatment and the sub plots to sixteen wheat genotypes. Post anthesis cutting irrigation caused significant reduction in grain yield (GY), biological yield (BY), harvest index (HI), canopy temperature depression (CTD), grain number per spike, 1000 grain weight and relative water content (RWC). Under normal irrigation conditions, the highest grain yield was obtained from Zarrin cultivar, whereas, under drought stress conditions, the highest grain yield was obtained from Tabasi cultivar. The trait most sensitive to water stress was grain yield (mean reduction 51.6% compared to control) followed by harvest index (mean reduction 37.2% compared to control). Correlation coefficient results showed that under normal irrigation conditions the highest correlation was between grain yield and biological yield (0.844*) and under stress conditions was found between grain yield and grain number per spike (0.895**), CTD (0.771**) and 1000 Grain weight (0.689**). Evaluating of CTD trend under stress conditions showed that by passing time from applying cutting irrigation, canopy temperature (CT) gradually increases due to water unavailability. The most reduction in grain and biological yield under drought stress was observed in C-85-7 genotype, whereas, cv. Shiraz with the least reduction in these two components, was found a drought tolerant and yield stability cultivar. At both irrigation treatments, there was a positive correlation between grain yield and CTD therefore, CTD may be a suitable index for selecting late-season water stress tolerant wheat cultivars. |
| first_indexed | 2024-12-12T11:32:42Z |
| format | Article |
| id | doaj.art-ebeb95263a924340a8f7d4a1c644ebb9 |
| institution | Directory Open Access Journal |
| issn | 2251-8517 |
| language | fas |
| last_indexed | 2024-12-12T11:32:42Z |
| publishDate | 2013-10-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Tulīd va Farāvarī-i Maḥṣūlāt-i Zirā̒ī va Bāghī |
| spelling | doaj.art-ebeb95263a924340a8f7d4a1c644ebb92022-12-22T00:25:44ZfasIsfahan University of TechnologyTulīd va Farāvarī-i Maḥṣūlāt-i Zirā̒ī va Bāghī2251-85172013-10-0139163176Response of Wheat Genotypes to Terminal Drought Stress Using Physiological IndicesM. J. Ahmadi Lahijani0Y. Emam1 Dept. of Agron. and Plant Breed., College of Agric., Shiraz Univ., Shiraz, Iran. Dept. of Agron. and Plant Breed., College of Agric., Shiraz Univ., Shiraz, Iran. In order to study the effect of terminal drought stress on yield and yield components and some physiological traits of wheat genotypes, a field experiment was conducted at the Research Farm of Agricultural College of Shiraz University during 2010-11 growing season in a split plot arrangement based on randomized complete block design with three replications. Main plots were assigned to irrigation treatment and the sub plots to sixteen wheat genotypes. Post anthesis cutting irrigation caused significant reduction in grain yield (GY), biological yield (BY), harvest index (HI), canopy temperature depression (CTD), grain number per spike, 1000 grain weight and relative water content (RWC). Under normal irrigation conditions, the highest grain yield was obtained from Zarrin cultivar, whereas, under drought stress conditions, the highest grain yield was obtained from Tabasi cultivar. The trait most sensitive to water stress was grain yield (mean reduction 51.6% compared to control) followed by harvest index (mean reduction 37.2% compared to control). Correlation coefficient results showed that under normal irrigation conditions the highest correlation was between grain yield and biological yield (0.844*) and under stress conditions was found between grain yield and grain number per spike (0.895**), CTD (0.771**) and 1000 Grain weight (0.689**). Evaluating of CTD trend under stress conditions showed that by passing time from applying cutting irrigation, canopy temperature (CT) gradually increases due to water unavailability. The most reduction in grain and biological yield under drought stress was observed in C-85-7 genotype, whereas, cv. Shiraz with the least reduction in these two components, was found a drought tolerant and yield stability cultivar. At both irrigation treatments, there was a positive correlation between grain yield and CTD therefore, CTD may be a suitable index for selecting late-season water stress tolerant wheat cultivars.http://jcpp.iut.ac.ir/browse.php?a_code=A-10-1-93&slc_lang=en&sid=1Canopy temperature depression Drought stress Relative water content Yield reduction. |
| spellingShingle | M. J. Ahmadi Lahijani Y. Emam Response of Wheat Genotypes to Terminal Drought Stress Using Physiological Indices Tulīd va Farāvarī-i Maḥṣūlāt-i Zirā̒ī va Bāghī Canopy temperature depression Drought stress Relative water content Yield reduction. |
| title | Response of Wheat Genotypes to Terminal Drought Stress Using Physiological Indices |
| title_full | Response of Wheat Genotypes to Terminal Drought Stress Using Physiological Indices |
| title_fullStr | Response of Wheat Genotypes to Terminal Drought Stress Using Physiological Indices |
| title_full_unstemmed | Response of Wheat Genotypes to Terminal Drought Stress Using Physiological Indices |
| title_short | Response of Wheat Genotypes to Terminal Drought Stress Using Physiological Indices |
| title_sort | response of wheat genotypes to terminal drought stress using physiological indices |
| topic | Canopy temperature depression Drought stress Relative water content Yield reduction. |
| url | http://jcpp.iut.ac.ir/browse.php?a_code=A-10-1-93&slc_lang=en&sid=1 |
| work_keys_str_mv | AT mjahmadilahijani responseofwheatgenotypestoterminaldroughtstressusingphysiologicalindices AT yemam responseofwheatgenotypestoterminaldroughtstressusingphysiologicalindices |