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اعتبار سنجی و تجزیه ارتباطی نشانگرهای ریزماهواره مرتبط با تحمل به تنش خشکی و شوری در برنجهای هوازی و ایرانی تحت تنش اسمزی | ||
فصلنامه علمی زیست فناوری گیاهان زراعی | ||
مقاله 5، دوره 4، شماره 2 - شماره پیاپی 10، شهریور 1394، صفحه 57-72 اصل مقاله (491.02 K) | ||
نوع مقاله: علمی پژوهشی | ||
نویسندگان | ||
طیبه رئیسی1؛ عاطفه صبوری* 2 | ||
1دانشجوی کارشناسیارشد اصلاحنباتات گروه زراعت و اصلاح نباتات دانشکده کشاورزی دانشگاه گیلان، رشت، ایران | ||
2استادیار اصلاح نباتات گروه زراعت و اصلاح نباتات دانشکده کشاورزی دانشگاه گیلان، رشت، ایران | ||
چکیده | ||
پژوهش حاضر در راستای اعتبارسنجی نشانگرهای ریزماهواره مرتبط با تحمل به تنش خشکی و شوری در برنج، در جمعیت طبیعی شامل برنج-های هوازی، ارقام خارجی و ایرانی انجام شد. مواد گیاهی در شرایط نرمال و همچنین دو سطح از تنش اسمزی ( 8- و 16- بار حاصل از مانیتول) با استفاده از آزمونهای استاندارد جوانهزنی از لحاظ 14 صفت ارزیابی شدند. ارزیابی ژنوتیپی با استفاده از 26 جفت نشانگر ریزماهواره بر روی 53 ژنوتیپ برنج انجام شد. نتایج حاصل از تجزیه ساختار نشان داد که تعداد خوشههایی که پارامتر ΔK را به حداکثر خود میرساند برابر 3 میباشد. سپس تجزیه ارتباط با استفاده از ماتریس ساختار جمعیت و با مدلهای آماری GLM و MLM انجام شد. دو مدل MLM در سطح 5%، به ترتیب 75 و 30 نشانگر برای صفات مورد مطالعه شناسایی کردند. نشانگرهای RM11943، RM104، RM190،RM28166، RM231، RM510، RM270 ، RM19367 و RM431 به عنوان نشانگرهای مرتبط با تحمل به تنش اسمزی با توجیه تغییرات مرتبط با چندین صفت جوانهزنی شناسایی شدند. همچنین نشانگر RM270 با توجیه 4/40% از تغییرات شاخص بنیه بذر و نشانگر RM276 با توجیه 9/33% از تغییرات درصد آب بافت گیاهچه و نشانگر RM523 با توجیه 6/40 و 7/30% از تغییرات ضریب سرعت جوانهزنی در دو مدل، بیشترین ضریب تبیین را در شرایط تنش نسبت به سایر نشانگرها به خود اختصاص دادند که می-تواند دلیلی بر تأیید ارتباط آنها با صفات جوانهزنی در شرایط تنش اسمزی باشد. با توجه به نتایج کسب شده، در صورت تأیید نتایج در سایر زمینههای ژنتیکی میتوان از این نشانگرها در برنامههای اصلاحی بهره-برداری نمود. | ||
کلیدواژهها | ||
تجزیه ساختار؛ نشانگر SSR؛ تنش خشکی؛ مولفه های جوانه زنی | ||
موضوعات | ||
اصلاح نباتات مولکولی | ||
عنوان مقاله [English] | ||
Validation and association analysis of microsatellite markers related to drought and salinity tolerance in Aerobic and Iranian rice under osmotic stress | ||
نویسندگان [English] | ||
Tayebe Raiesi1؛ Atefeh Sabouri2 | ||
1M.Sc. student of Plant Breeding, Department of Agronomy & Plant Breeding, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran | ||
2Assistant Professor, Department of Agronomy & Plant Breeding, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran. | ||
چکیده [English] | ||
The present study was conducted to validate microsatellite markers associated with drought tolerance in rice, in the natural population, including foreign varieties, aerobic rice and Iranian varieties. Plant material under normal and two levels of osmotic stress (-8 and -16 bar using of mannitol) were evaluated by standard germination test in terms of 14 traits. Genotyping was done using 26 pairs of microsatellite markers on 53 genotypes of rice. The results of the structure analysis showed the number of clusters that maximizes ΔK parameter is three. Then association analysis was conducted using the matrix structure of the population by GLM and MLM statistical models. Two MLM models identified, 75 and 30 markers for studied traits at 5% level, respectively. The markers RM11943, RM104, RM190, RM28166, RM231, RM510, RM270, RM19367 and RM431 were identified as markers associated with tolerance to osmotic stress with explain variation of several germination traits. Also the results indicated RM270 with 40.4% of the seed vigor, RM276 with explain variation of 33.9% of the percentage of water content of the seedling, and RM523 with explain variation of 40.6% and 30.7% of the speed of germination coefficient, had highest of coefficient of determination under stress relatively to other markers. That could be a reason for conformation of their relationship with germination traits under osmotic stress. Considering of the obtained results, after verification of results in the other genetic backgrounds we can use these markers in the breeding programs. | ||
کلیدواژهها [English] | ||
Structural Analysis, Components of germination, Drought stress, SSR markers | ||
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