جستجوی مقالات مرتبط با کلیدواژه « روابط صفات » در نشریات گروه « بیوتکنولوژی و ژنتیک گیاهی »

In order to evaluate heritability of agro-morphological characters as well as study of relationship between genetic diversity with geographical factors in Einkorn wild wheat populations (41 accessions consisted of 33 accessions of T. boeoticum and 8 accessions of T. urartu species), an experiment was conducted based on a randomized complete block design with three replications in research station of University of Tabriz, Iran during 2011-2012 growing seasons. Analysis of variance showed significant differences among the accessions for all of studied characters except numbers of total tiller and fertile tiller. Mean comparison also revealed significant differences between the two species in terms of all characters except leaf width as well as weight of total spikes and harvest index. For both of the species, heritability and variation coefficients indicated high level of genetic variation for agro-morphological characters. According to correlation coefficients, a positive and significant relation was found among the studied characters. However, only correlation between latitude and spike length as well as altitude and number of total tillers were positive and significant. Clustering of the accessions on the basis of all characters and geographical factors produced two main groups, so that in both dendrograms grouping of accessions were greatly consistent with each other. Accessions with closer altitude and latitude were allocated to similar groups. On the whole, remarkable level of genetic diversity among Einkorn wheat, especially accessions collected from Kermanshah and Lorestan provinces was revealed, implying special attention to germplasm of the areas is required.

Evaluation of genetic diversity and relationship among traits are an essential prerequisite for direct and indirect selection in plant breeding. This experiment was carried out to evaluate the relationship between morphological and agronomic traits and to classify 56 sainfoin accessions using multivariate statistical analysis methods during 2010-2011. Results of estimated correlation coefficients showed that dry matter yield had significant positive correlation with plant height، number of stem per plant and length of panicle. Whereas، there was a negative significant correlation between dry matter yield and leaf percent and leaf to stem ratio. On the basis of stepwise regression، number of stem per plant and plant height explained the majority of dry matter yield variation and leaf percent solely could justify 64% of forage palatability variation. Cluster analysis could separate Iranian and exotic sainfoin accessions on the base of morphological traits. Also accessions of similar geographic origin were mainly clustered in the same groups. Moreover، principle components analysis confirmed the result of cluster analysis. Finally results indicated that there was high variation for studied traits among Iranian and exotic sainfoin genotypes which can be useful to select suitable parents to produce synthetic varieties in breeding programs.