a cytogenetical study on 13 alfalfa (medicago sativa) cultivars available in iranian forest and rangelands genebank was performed in order to obtain basic information on the variability in chiasma frequency/distribution, chromosome association and segregation. such cytogenetic information is useful for planning hybridization programs. cluster analysis of meiotic data and ordination of cultivars...

objective(s): sertoli cells support in vivo germ cell production; but, its exact mechanism has not been well understood. the present study was designed to analyze the effect of sertoli cells in differentiation of mouse embryonic stem cells (mescs) to germ cells.   materials and methods: a fusion construct composed of a stra8 gene promoter and the coding region of enhanced green fluorescence pro...

background & aim: alhagi genus has two important  medicinal plant species in iran, including alhagi pseudoalhagi, and a. graecorum (known “kharshotor” in persian). these plants are distributed in iran like weeds. generally, alhagi is used as an anti-hemorrhoid, laxative and diuretic. manna in both species produced by activity of a kind of insect on alhagi branches which has medicinal proper...

  Objective(s): Sertoli cells support in vivo germ cell production; but, its exact mechanism has not been well understood. The present study was designed to analyze the effect of Sertoli cells in differentiation of mouse embryonic stem cells (mESCs) to germ cells.   Materials and Methods: A fusion construct composed of a Stra8 gene promoter and the coding region of enhanced green fluorescence p...

Genipa americana L., commonly known as genipap, belongs to the Rubiaceae family. This study aimed describe pollen morphology of species, evaluate its meiotic behavior and viability, provide information help maintenance conservation species in natural habitat. Flower buds were collected from 20 individuals Alta Floresta Matupá municipalities, Mato Grosso, Brazil. Pollen was characterized using a...

A cytogenetical study on 13 alfalfa (Medicago sativa) cultivars available in Iranian Forest and Rangelands Genebank was performed in order to obtain basic information on the variability in chiasma frequency/distribution, chromosome association and segregation. Such cytogenetic information is useful for planning hybridization programs. Cluster analysis of meiotic data and ordination of cultivars...

in the present paper, the cytogenetic study including meiotic chromosome number and behavior along with pollen viability were performed in 4 populations of trigonella spruneriana boiss. this is the first cytogenetic report of the taxon. all populations are diploid and possess 2n = 2x = 16 chromosome number, which is consistent with the proposed basic number of x = 8. in addition, some meiotic i...