Genetic diversity of rice mutant genotypes using multivariate methods

Document Type : Research Paper

Author

Department of Agronomy and Plant Breeding, Rasht Branch, Islamic Azad University, Rasht, Iran

Abstract

Genetic diversity among 64 rice genotypes including 56 M5 mutants and 8 check varieties was studied using multivariate analysis. The experimental materials were evaluated during growing season of 2013-14 at the experimental field of Rice Research Institute of Iran (RRII), Rasht, Iran. The field experiment was arranged in a randomized complete block design with three replications. With respect to the positive and significant partial regression coefficients and direct effects of number of panicles per plant and number of spikelet per panicle, it could be stated that increasing the amount of these traits will cause an increase in grain yield. The dendrogram from cluster analysis divided all 64 rice genotypes into three main groups. Maximum distance existed between clusters II and III, therefore the genotypes selected from these clusters could be used in hybridization programs. The first principal component included plant height, internode length, number of panicles per plant, panicle length, panicle weight, number of filled grains, grain productivity, 100 grain weight, grain width and grain yield. Second principal component included days to flowering, number of panicles per plant and number of unfilled grains. Two-dimensional plot based on the first two principal components indicated the existence of differences among rice genotypes under study. The presence of vast diversity among 64 rice genotypes by cluster analysis was also confirmed partly by the three-dimensional graph of three principal components. In conclusion, the studied genotypes represent a rich source of genetic diversity and could be useful in rice breeding programs. The crosses G53 × G39 and G62 × G11 will be useful for hybridization, because the parental genotypes were identified as being most divergent.
 
 

Keywords

Article Title [Persian]

تنوع ژنتیکی در ژنوتیپ‌های موتانت برنج با استفاده از برخی از تجزیه‌های چند متغیره

Abstract [Persian]

تنوع ژنتیکی 64 ژنوتیپ برنج از جمله 56 ژنوتیپ جهش‌یافته نسل M5 و 8 رقم شاهد با استفاده از تجزیه چند متغیره به صورت طرح بلوک‌های کامل تصادفی با سه تکرار بررسی شد. مواد آزمایشی در فصل رشد 1393-1392 در مزرعه آزمایشی موسسه تحقیقات برنج ایران (RRII) در رشت، ارزیابی شدند. با توجه به ضرایب رگرسیون جزء و اثرات مستقیم مثبت و معنی‌دار تعداد خوشه در بوته و تعداد خوشه‌چه در خوشه می‌توان اظهار داشت که افزایش این صفات منجر به افزایش عملکرد دانه خواهد شد. دندروگرام تجزیه خوشه‌ای 64 ژنوتیپ برنج را در سه گروه اصلی قرار داد. حداکثر فاصله بین دسته دوم و سوم وجود داشت. بنابراین، ژنوتیپ‌های انتخاب شده از این گروه­ها می‌توانند در برنامه­های دورگ­گیری مورد استفاده قرار گیرند. در تجزیه به مولفه­های اصلی، اولین مؤلفه اصلی صفات ارتفاع بوته، طول میانگره، تعداد خوشه در بوته، طول خوشه، وزن خوشه، درصد باروری دانه، وزن صد دانه، عرض دانه و عملکرد دانه را در بر ‌گرفت. مؤلفه اصلی دوم شامل تعداد روز تا گل‌دهی، تعداد خوشه‌چه در خوشه و تعداد دانه‌های پوک در خوشه بود. نمودار دو بعدی بر اساس دو مؤلفه اصلی اول اختلاف‌های ژنتیکی بین ژنوتیپ‌ها را نشان داد. تفاوت‌های زیاد بین 64 ژنوتیپ با استفاده از تجزیه کلاستر، توسط نمودار سه بعدی حاصل از سه‌ مؤلفه اصلی اول نیز تا حدودی تأیید شد. در مجموع، ژنوتیپ‌های مورد مطالعه یک منبع غنی از تنوع ژنتیکی را نشان دادند که می‌توانند برای برنامه‌های اصلاح برنج مفید باشند. تلاقی­های 53 × 39 و 62 × 11 با توجه به تفاوت زیاد بین والد­های آن­ها، برای دورگ‌گیری مناسب هستند.
 

Keywords [Persian]

  • برنج
  • تجزیه خوشه‌ای
  • تجزیه رگرسیون
  • تجزیه به مؤلفه‌های اصلی
  • تنوع ژنتیکی
  • موتانت

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Journal of Plant Physiology and Breeding
Volume 8, Issue 1
June 2018
Pages 111-124

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