جستجوی مقالات مرتبط با کلیدواژه « دورگه » در نشریات گروه « باغبانی »

In this research, 16 local and 4 imported lines were evaluated using morphological and phonological characteristics via lettuce descriptor in a completely randomized design block with 3 replicates at University of Guilan. Results indicated that there is a high variability in local lettuce lines. Imported lines, in comparison to local lines, had significant differences in the most evaluated traits. These differences could be considered in breeding. According to flowering time, evaluated lettuce lines ranked in three groups, including early, moderate and late flowering. Head weight ranged from 906.33 g (line 84-96-TN) to 284.33 g (line Sheikh-Aboud) and their differences were significant at P≤0.01. There are high genetically variations between lettuce lines. The differences between lettuce lines were significant for quantitative traits. Cluster analysis based on quantitative and qualitative characteristics was conducted separately. Evaluated lines were ranked into 3 groups based on quantitative and qualitative characteristics. Differences in cluster analysis between quantitative and qualitative traits were observed. These differences could be considered in crosses, breeding works, and hybrid seed production with different characteristics.

The genus Rosa has a wide variety in Iran and although some natural hybrids have been found in different regions of the country, but no cultivars have been established so far. In order to optimize use of genetic resources in the country and to create varieties with desirable traits, inter-species relationships and identification of diversity, 45 populations from seven species in section Caninae collected from 13 provinces of Iran, were studied. To group the species, 61 qualitative and quantitative characters using the most suitable method of cluster analysis (WARD) were used and their ordination diagram based on the most variable factors for each species and sections were drown. Cluster analysis of quantitative and qualitative characters showed significant differences between characters. The results of classification confirmed previous taxonomy grouping. Factor analysis of R. elymatica populations showed that the hair on pedicels, sepal form, hip length, prickle base and prickle formpossessed the highest correlation. Two main groups were formed in R. boissieri based on ecological difference between them. Cluster analysis of R. orientalis also showed two main groups. Moreover, the results indicated that some populations of R. canina such as Polour, Karand, and Siahbishe (Iran), that showed the most variations in qualitative and quantitative characters, could be used to produce interspecific hybrids.Overall, the results of this study revealed that, R. canina and R. pulverulenta showed the highest variety in the section Caninae that is due to the combination of some unusual features in section.

Incompatibility in hazelnut (C. avellana L.) is the sporophytic type and under the control of a single S-locus with multiple alleles. Compatibility of pollen-stigma in hazelnut is an important consideration in planning crosses in breeding program and in choosing pollinizers for orchard planting. In this study، fluorescence microscopy was used to determination of S-alleles and compatibility relationships among in 24 progeny of TGL × Cosford. Four pollen testers، selected for each one of the four alleles under investigation (S2، S3، S7 and S11). When stiminate catkins elongated and were about to shed pollen، they were collected and dried. The catkins were discarded، pollen collected and stored in freezer (-20 0C). In each seedling trees، two branches emasculated، and bagged. Female clusters were detached from bagged limbs، when style protrude 2-6 mm. Five clusters from each seeding progeny pollinated with each pollen testers. About 20 to 24 hours after pollination، the stigmatic styles were detached from buds and squashed in aniline blue dye and examined with fluorescence microscope (40x and 100x). In this research، S-alleles determined in 22 progenies. However in two progenies، distinguished only one S-allele. In a compatible pollination، pollen germinates well، the pollen tubes penetrate the stigmatic surface and produce a mass parallel tubes. But in incompatible reactions، pollen germination was often reduced، and pollen grains that germinate produced short tubes.