فهرست مطالب سمیه سراوانی

Genetic diversity in field crops has important role in breeding programs. The object of this study were to evaluate the genetic diversity and association analysis of morphological traits and mildew disease of wheat germplasm.

In the research 116 wheat genotypes were assessed for morphologic traits using a lattice design with 3 replications in the research field of Gonbad Kavous University. Plants response to powdery mildew was also evaluated. 10 ISSR and IRAP markers were applied for molecular analysis.
 

There was a significant difference between genotypes for all measured traits except 1000 grain weight. In molecular evaluation using ISSR and IPBS markers, 57 bands were amplified where 47 bands were polymorphic. The number of polymorphic bands was ranged from 3 to 6 bands for each primer. The maximum polymorphic bands belonged to PRI-14, PRI 43 and PRI 50 primer. The PIC and MIC values ranged from 0.35-0.88 and 0.62-3.14 respectively. The maximum percent of polymorphism belonged to PRI-13, PRI-14, PRI-43, PRI-20 and PRI-10. The maximum Molecular Index was 3.14 in PRI-7. Cluster analysis was grouped lines into three groups, which genotypes 60 and 786 were the most resistance to Powdery mildew. Association analysis between markers and resistance to powdery mildew revealed that total of 9 primers showed a connection to the character.
 

Based on the results of this research, genotypes with acceptable morphological traits and resistance to powdery mildew could be screened for advanced wheat breeding programs.

Type section of Pabdeh Formation (Late Paleocene- Early Oligocene) is located in the Gurpi anticline, Zagros, Khouzestan Province. Lithologically Pabdeh Formation consists of purple and white to yellowish marl, marly limestone and thin- to thick- bedded limestone, rich in pelagic foraminiferas. Pabdeh Formation conformably overlies Gurpi Formation and is conformably overlained by Asmari Formation. Petrographic studies, description and microfacies analysis specially hemipelagic, pelagic and calciturbidite facies of Paleocene to Lower Oligocene indicate that Pabdeh Formation was deposited in a deep marine basin. Field observations, facies studies and sequence studies resulted in identification of stratal key surfaces of sequence stratigraphy such as sequence boundary, maximum flooding surface, transgressive surface, system tracts and 9 depositional sequences. Sequence P1, P2 and LST, FSST of sequence P3 are of Paleocene in age, based on identification of planktonic foraminifera, TST, HST and FRWST of sequence P3 and sequences P4, P6, P7 and P8 were deposited during Eocene, and sequence P9 suggest an age of Upper Eocene- Lower Oligocene. All sequences begin with SB2 and except of sequence P3 and P4 , SB2 and Ts surfaces coincide with each other. Deepest mfs is belongs to the sequence P3; due to the remarkable abundance of glauconite minerals. Relative sea- level curves in most sequences, except for sequences P3, P8 and P9 exactly correlate with standard global sea level curves. The role of synsedimentary tectonic activities and sea-level oscilations ,probably, are responsible for deposition of sequences P3, P8 and P9.