We studied the thermophilous grass Bromus erectus in Central Europe to determine its pattern of population genetic structure and genetic diversity, using ISSR-PCR fingerprinting to analyze 200 individuals from 37 populations. We found three genetic groups with a clear geographic structure, based on a Bayesian approach. The first group occurred west and south of the Alps, the second east and north of the Alps, and the third was formed by four genetically depauperated populations in Germany. The populations from Germany formed a subset of the Bohemian-Moravian populations, with one private allele. Two differentiation centers, one in the AtlanticMediterranean and the second in the Pannonian-Balkan area, were recognized by species distribution modeling. The geographic distribution of the genetic groups coincides with the syntaxonomic split of the Festuco-Brometea class into the Festucetalia valesiaceae and Brometalia erecti orders. We found a statistically significant decrease in mean ISSR bands per individual from south to north, and to a lesser extent from the east to west. The former was explained by Holocene long-distance migrations from southern refugia, the latter by the difference in the gradient of anthropopression. We hypothesize a cryptic northern shelter of the species in Central Europe in the putative Moravian-Bohemian refugium.K Ke ey y w wo or rd ds s: : Festuco-Brometea, general linear model, glacial refugia, Poaceae, phylogeography, species distribution modelling.
Rhizobium spp. was isolated from root nodules of Pigeon pea (Cajanus cajan L.), Sweet pea (Lathyrus sativus L.), Chick pea (Cicer arietinum L.). The isolates ware rod shaped, aerobic, gram negative, motile and non-spore forming. Isolates were positive to Catalase, Citrate utilization, Urea hydrolysis, Congored, Nitrification, Oxidase, Triple sugar iron and MacConkey agar test. The isolates can ferment all nine sugars. Then, the isolates identified as Rhizobium spp. depending on above results were subjected to 16S rRNA sequencing for further confirmation and identification. Surprisingly, the isolates were same strain or member of same cluster of Rhizobium and identified as Rhizobium sp.CCNWYC119 strain based on 16S rRNA sequence (98% similarity). Then, different parameters of soil quality enrichment and plant growth viz. plant height; weight of pods and seeds; number, fresh and dry weight of nodules were studied to test the efficacy of the isolate as biofertilizer. Here, inoculant of Rhizobium sp. isolated from Pigeon pea was used as biofertilizer. The results showed the significant increase of nodulation, enrichment of soil of rhizosphere, plant growth and yield for all three types of inoculated peas as compared with non-inoculated control peas indicating that the isolated strain could be used as a common efficient biofertilizer for Pigeon pea, Sweet pea and Chick pea. It was also found that the isolate grew optimally at temperature 28°C and pH 7.0. Moreover, the isolate was sensitive to the higher concentration of NaCl (>1%) and to antibiotics- Mecillinam, Ciprofloxacin, Cotrimoxazole, Pefloxacin, Ceftazidime and Tetracycline.
Mandal, A. 1987. Induction of androgenetic haploids in the breeding materials of winter rape (Brussica napus).—Hereditas 106: 189–193. Lund, Sweden. ISSN 0018–0661. Received June 26, 1986
Advantages resulting from the utilization of androgenetic haploids not only as materials for theorctical researches (mutagenesis, gene mapping etc) but also for breeding purposes are self‐evidents for most of the scientifical workers. In this current work haploid shoots of winter rape (Brussica nupus, ssp. oleifera, var. Gorczanski) were received from in vitro culture of anthers collected from five breeding lines. The effects of various factors (such as genotype, medium, temperature of incubation etc.) affecting directly the induction of androgenetic plantlets in Brassica napus were experimentally considered. The amount (%) of induced haploids in the light of the results obtained in my experiments seems to be sufficient for practical applications of this anther culture technique in the breeding programmes of winter rape.
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