نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه ژنتیک و بهنژادی گیاهی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران، ایران
2 razi
3 دانشگاه ایلام
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Introduction: Wheat is the most important food crop in the world in terms of cultivated area, commercial value and human nutrition, and compared to other agricultural products, it plays the biggest role in providing food security in the world. Drought is one of the major environmental factors which threaten wheat production worldwide. In fact, drought and heat stress are two main factors reducing wheat productivity worldwide. Therefore, it is inevitable to improve and release new wheat cultivars adapted to adverse climate change. Drouth stress during sensitive growth stages of wheat, including grain filling, decreases kernel weight and the number of grains in the spike that results in a considerable drop in wheat yield. In recent years, numerous studies have focused on identifying wheat genotypes that are well-suited to dry conditions. Native varieties and wild relatives are being explored as primary sources of drought tolerance. The results of these studies serve as a foundation for further research into specific species found within wheat germplasm.
Materials and methods: In this research, 19 genotypes were studied to identify those tolerant to drought stress. 19 indicators were used to assess the genotypes in terms of sensitivity and resistance to drought stress. Due to the difference in the results of the indicators, for more accuracy, the RS rating was used, which is based on the average and standard deviation of the ratings. Finally, the top genotypes were recognized by this ranking.
Results: Taking all indicators into account, genotypes 11, 4, and 5 were ranked highest and recognized as drought-resistant genotypes. Principal Component Analysis was conducted for drought resistance indices, revealing that the first two components made the largest contribution in explaining the variance of the data. The first component accounted for 66.78% and the second component accounted for 32.50% of the total variance. Based on the calculated indices, genotypes were categorized into four distinct groups. Genotypes 11, 4, and 5, which were identified as the best genotypes based on RS, were grouped together. Through cluster analysis, genotypes were further classified into four groups: resistant, semi-resistant, semi-sensitive, and sensitive.
Conclusion: The results showed that genotypes number 4, 5, 11, and 14 had the highest values of YS, HAM, and YI indices under drought stress conditions. In contrast, genotypes 1, 6, 7, and 10 had the lowest YS and YI values. These findings are in line with previous researches that show that grain yield in stress and non-stress conditions is the best criterion for evaluating drought resistance.
Keywords: index, tolerance, native mass, heat map.
Keywords: index, tolerance, native mass, heat map.
کلیدواژهها [English]
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