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Evaluation of rain-fed wheat (Triticum aestivum L.) genotypes for drought tolerance | ||
Iranian Journal of Genetics and Plant Breeding | ||
مقاله 4، دوره 9، شماره 1 - شماره پیاپی 17، تیر 2020، صفحه 28-40 اصل مقاله (524.04 K) | ||
نوع مقاله: Research paper | ||
شناسه دیجیتال (DOI): 10.30479/ijgpb.2020.12734.1265 | ||
نویسندگان | ||
Farzad Ahakpaz1؛ Eslam Majidi Heravan* 1؛ Mozaffar Roostaei2؛ Mohammad reza Bihamta3؛ Soleiman Mohammadi4 | ||
1Department of Agronomy and Plant Breeding, College of Agriculture and Natural Resources, Science and Research Branch, Islamic Azad University, Tehran, Iran. | ||
2Department of Cereals, Dryland Agricultural Research Institute, Agricultural Research, Education and Extension Organization, Maragheh, Iran. | ||
3Department of Agronomy and Plant Breeding, College of Agriculture and Natural Resources, Tehran University, Karaj, Iran. | ||
4Department of Cereals, Miandoab Agricultural Research Station, Miandoab, Iran. | ||
تاریخ دریافت: 30 بهمن 1398، تاریخ بازنگری: 28 مرداد 1399، تاریخ پذیرش: 09 تیر 1399 | ||
چکیده | ||
Drought stress is one of the most important environmental stresses that have limited the production of wheat, especially in arid and semi-arid regions of the world. To recognize drought tolerant rain-fed wheat genotypes and to determine the best tolerance/susceptibility indices, a study was conducted at the Agricultural Research Station of Miandoab for two cropping years (2013-15). The experimental materials included 12 rain-fed wheat genotypes investigated in two separate field experiments based on randomized complete blocks design with three replications under both rain-fed and supplemental irrigation conditions. The combined ANOVA for grain yield and agro-physiological traits showed that there was a large genetic difference between wheat genotypes for grain yield and studied traits in response to drought stress among years and moisture regimes. The different drought tolerance/susceptibility indices were used to characterize drought tolerance of genotypes. Generally, a reduction of RWC in drought tolerant genotypes (genotypes 6, 2, 11, and 10) was lower compared to the sensitive genotypes (genotypes 4 and 8). Cluster analysis based on drought tolerance indices categorized genotypes into two main groups. The genotypes belonging to the cluster 1 could be introduced as tolerant to the drought conditions. According to MSI (Multiple scoring index), genotypes 10 (Seafallah/3/Sbn//Trm/K253) and Saein had the best combination of productivity and resistance to drought stress. The significant correlation between MSI with grain yield under drought conditions indicated the superiority of MSI as a useful tool for efficient selection of drought-tolerant genotypes. In the present study there was no significant correlation between RWC and RWL with MP, GMP, STI and MSI indices under both conditions. | ||
کلیدواژهها | ||
Cluster analysis؛ Drought stress؛ Multiple scoring index؛ productivity capacity index | ||
عنوان مقاله [English] | ||
ارزیابی ژنوتیپ های گندم دیم (Triticum aestivum L.) برای تحمل به خشکی | ||
نویسندگان [English] | ||
فرزاد آهک پز1؛ اسلام مجیدی هروان1؛ مظفر روستایی2؛ محمدرضا بی همتا3؛ سلیمان محمدی4 | ||
1گروه زراعت و اصلاح نباتات، دانشکده کشاورزی و منابع طبیعی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران. | ||
2بخش تحقیقات غلات، سازمان تحقیقات، آموزش و ترویج کشاورزی، موسسه تحقیقات کشاورزی دیم کشور، مراغه، ایران. | ||
3گروه زراعت و اصلاح نباتات، دانشکده کشاورزی و منابع طبیعی، دانشگاه تهران، تهران، ایران. | ||
4بخش غلات، ایستگاه تحقیقات کشاورزی میاندواب، میاندواب، ایران. | ||
چکیده [English] | ||
تنش خشکی یکی از مهمترین تنشهای محیطی است که تولید گندم را بهویژه در مناطق خشک و نیمهخشک جهان محدود کرده است. برای شناسایی ژنوتیپهای متحمل به خشکی در گندم و تعیین بهترین شاخص های مقاومت/حساسیت به خشکی، مطالعهای در دو سال متوالی (1392 الی 1394) در ایستگاه تحقیقات کشاورزی میاندوآب اجرا شد. مواد ژنتیکی شامل 12 ژنوتیپ گندم دیم بود که در دو آزمایش مزرعهای جداگانه بر اساس طرح بلوکهای کامل تصادفی (RCBD) با سه تکرار و در دو شرایط جداگانه آبیاری تکمیلی و دیم کامل بررسی شدند. در بین ژنوتیپهای گندم مورد مطالعه، تنوع ژنتیکی قابل ملاحظهای از نظر عملکرد دانه و صفات آگرو- فیزیولوژیکی در پاسخ به تنش خشکی در خلال سالها و رژیمهای رطوبتی متفاوت وجود داشت. برای بررسی درجة مقاومت به خشکی ژنوتیپها از شاخصهای مختلف تحمل نسبت به خشکی استفاده شد. تجزیة خوشهای بر اساس شاخصهای تحمل به خشکی، ژنوتیپها را به دو گروه اصلی تقسیم میکند که ژنوتیپهای متعلق به خوشه 1 میتوانند به عنوان ژنوتیپهای مقاوم به خشکی معرفی شوند. براساس «MSI» یعنی شاخص امتیازدهی چندگانه، ژنوتیپهای 10 (Seafallah/3/Sbn//Trm / K253) و ساعین بیشترین میزان عملکرد دانه و تحمل به خشکی را از خود نشان دادند. همبستگی معنیدار MSI با عملکرد دانه در شرایط خشکی، نشاندهندة برتری MSI به عنوان یک ابزار مفید برای گزینش کارآمد ژنوتیپهای مقاوم به خشکی بود. در این مطالعه رابطهای بین RWC و RWL با MP، GMP، STI و MSI به دست نیامد. | ||
کلیدواژهها [English] | ||
تجزیه خوشه ای, تنش خشکی, شاخص امتیازدهی چندگانه, شاخص ظرفیت تولید | ||
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