Longitudinal differentiation in chromosomes of some Sesbania Scop, species (Fabaceae)
نویسندگان
چکیده
Three different techniques were applied to analyze the patterns of longitudinal chromosome differentiation in five Sesbania species (S. exasperata, S. punicea, S. sesban, S. tetraptera, and two different geographical populations of S. virgata). For all the species investigated, the prophase chromosome condensation was always proximal. After staining with the fluorochromes chromomycin A, and DAPI, each karyotype revealed two or four CM AY DAPI~ heterochromatic blocks, apparently corresponding to the nucleolus organizing regions. However, in S. virgata two or four CMA bands were observed, depending on the population studied. No DAPI bands were observed. C-banding showed the most diversified patterns, being a more useful technique to distinguish karyorypes of Sesbania species. The largest amount of heterochromatin was observed in S. virgata (subgenus Daubentonia) whereas the smallest was found in S. sesban (subgenus Sesbania).
منابع مشابه
Stem and Root Nodulation in Aeschynomene spp.
Nodulation ability of 15 Rhizobium strains isolated from root and stem nodules of tropical Aeschynomene species was studied on 20 different Aeschynomene species and four other legumes-Arachis hypogaea, Stylosanthes guianensis, Macroptilium atropurpureum, and Sesbania rostrata. The results of this investigation showed that Aeschynomene species could be divided into three groups according to the ...
متن کاملPhylogeny of Onobrychis sect. Hymenobrychis (Fabaceae) based on chloroplast DNA sequence data
Phenetic analysis of morphological characters in different species of Onobrychis Miller sect. Hymenobrychis DC. (Fabaceae), classified them in two main groups based on corolla features. To determine the phylogenetic relationships among the 13 species, chloroplast DNA sequences were used. Analysis of these data resulted in a well-resolved and well-supported phylogeny. Phylogenies generated by ma...
متن کاملDifferences in plastic responses to defoliation due to variation in the timing of treatments for two species of Sesbania (Fabaceae).
BACKGROUND AND AIMS Plastic responses to stress in components of reproduction can have important effects on plant fitness and can vary both within and between species. Responses may also depend on when in the life cycle stress occurs. Here, it is predicted that the timing of initiation of a stress, defoliation, would affect the pattern of plastic responses. These differences should occur becaus...
متن کاملNodulation of Sesbania species by Rhizobium (Agrobacterium) strain IRBG74 and other rhizobia.
Concatenated sequence analysis with 16S rRNA, rpoB and fusA genes identified a bacterial strain (IRBG74) isolated from root nodules of the aquatic legume Sesbania cannabina as a close relative of the plant pathogen Rhizobium radiobacter (syn. Agrobacterium tumefaciens). However, DNA:DNA hybridization with R. radiobacter, R. rubi, R. vitis and R. huautlense gave only 44%, 5%, 8% and 8% similarit...
متن کاملGrowth and metal accumulation in vetiver and two Sesbania species on lead/zinc mine tailings.
The lead (Pb)/zinc (Zn) tailings contained high concentrations of heavy metals (total Pb, Zn, Cu and Cd concentrations 4164, 4377, 35 and 32 mg kg(-1), respectively), and low contents of major nutrient elements (N, P, and K) and organic matter. A field trial was conducted to compare growth performance, metal accumulation of Vetiver (Vetiveria zizanioides) and two legume species (Sesbania rostra...
متن کامل