پديد آورنده :
رضايي برزاني، معصومه
عنوان :
مطالعات سيتو ژنتيك در ژنو تيپ هاي گندم داراي ميوز جبراني
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
اصلاح نباتات
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان ، دانشكده كشاورزي
صفحه شمار :
ده ، 94 ، [II] ص: مصور ، جدول ، نمودار
يادداشت :
ص. ع. به: فارسي وانگليسي
استاد راهنما :
احمد ارزاني ، بدرالدين ابراهيم سيد طباطبايي
استاد مشاور :
آقا فخر ميرلوحي
توصيفگر ها :
پلي پلوئيدي , ناهنجاري ميوز , كاريوتيپ , كروموزوم
تاريخ نمايه سازي :
88/6/14
استاد داور :
محمد حسين اهتمام ، نعمت اله اعتمادي
تاريخ ورود اطلاعات :
1396/09/13
چكيده فارسي :
به فارسي وانگليسي : قابل رويت در نسخه ديجيتال
چكيده انگليسي :
Cytogenetic Studies of Wheat Genotypes Possessing Meiotic Restitution Masoumeh Rezaei Barzani Msh rezaei@yahoo com 14th Feb 2009 Department of Agronomy and Plant Breeding Isfahan University of technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors1 Ahmad Arzani a arzani@cc iut ac irSupervisors2 Badreddin Ebrahim Sayed Tabatabaei sayedt@cc iut ac irAbstractPolyploid speciation is one of the most important evolutionary processes in plants that involves interspecific crosses fertile hybrid development chromosome doublingand diploidization Unreduced gamete formation via meiotic restitution as seen in thegenus Triticum plays a major role in producing allopolyploid species Namely Breadwheat has experienced two steps of meiotic restitution occurring in amphihaploidhybrid plants with AB and ABD genome It was known that meiotic restitution isinfluenced by gene s via changing the meiotic behavior and cause to formation ofunreduced gametes Besides meiotic behavior of plant chromosomes influences byenvironmental conditions including temperature light and soil In this study meioticbehavior and chromosome characteristics of eight genotypes of tetraploid andsynthetic hexaploid wheats possessing different level of meiotic restitution werecompared In addition two populations of tetraploid hulled wheat two genotypes ofrye and one cultivar of triticale were used Also Chinese Spring wheat cultivar wasused as control These genotypes were grown in autumn and winter planting date When the spikes were at suitable stage of meiotic division immature spikes wereharvested fixed in carnoy solution stained with hematoxilin and observed under lightmicroscope For karyotype analysis the root tips of seedlings were pretreated with mono bromonaphtalene fixed in Lewitsky solution hydrolyzed in 1N sodiumhydroxide stained with hematoxilin squashed and ultimately observed under lightmicroscope The results of meiotic deliberations indicated that the samples that hadplanted in autumn season facing natural conditions possessed normal meioticbehavior with the exception of a few abnormalities On the other hand samples ofwinter planting due to high temperature at the flowering period possessed highermeiotic aberrations like laggards chromosome stickiness micronucleus abnormalcytokines chromatin pulling and meiotic restitution Rye genotypes had the leastamount of meiotic abnormalities 0 in autumn planting samples and 2 in winterplanting samples while triricale genotype had the most abnormalities 60 in autumnplanting samples and 92 in winter planting samples In addition meiotic restitutiontopicalities like dyad and triad formations were seen in two genotypes of tetraploidwheats which had been under temperature stress It concluded that high temperaturecould affect and increased formation of unreduced gamete The results of karyotypeanalysis of the genotypes indicated that the total length of chromosomes significantlydiffered among tetraploid wheats It could be attributed to the chromosomes fixed atdifferent stages of mitosis However these genotypes did not have any significantvariation for centromere index and arm ratio characteristics The total length of
استاد راهنما :
احمد ارزاني ، بدرالدين ابراهيم سيد طباطبايي
استاد مشاور :
آقا فخر ميرلوحي
استاد داور :
محمد حسين اهتمام ، نعمت اله اعتمادي
