922 resultados para Riverside populations
Resumo:
The objective of this work was to characterize the populations of Gossypium barbadense in the states of Amapá and Pará, Brazil. In situ characterization was conducted through interviews with the owners of the plants and environmental observations. Leaf or petal tissue as well as seed samples were collected for genetic characterization by single sequence repeats markers and for storage in germplasm banks, respectively. The plants were maintained in dooryards and used mainly for medical purposes. The genetic analysis showed no heterozygous plants at the loci tested (f = 1), indicating that reproduction occurs mainly through selfing. The total genetic diversity was high (He = 0.39); and a high level of differentiation was observed between cotton plants from the two states (F ST = 0.36). Conventional methods of in situ maintenance of G. barbadense populations are not applicable. The conservation of the genetic variability of populations present in the two states could be achieved through germplasm collection and establishing of ex situ seed banks.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
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A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
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A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.
Resumo:
The objective of this work was to identify the best selection strategies for the more promising parental combinations to obtain lines with good resistance to soybean Asian rust (Phakopsora pachyrhizi). Two experiments were carried out in the field during the 2006/2007 and 2007/2008 growing seasons, to determine the percentage of infected leaf area of individual plants of five parents and their segregant F2 and F3 populations. The data obtained indicates that additive genetic variance predominates in the control of soybean resistance to Asian rust, and that the year and time of assessment do not significantly influence the estimates of the genetic parameters obtained. The narrow-sense heritability (h²r) ranged from 23.12 to 55.83%, and indicates the possibility of successful selection of resistant individuals in the early generations of the breeding program. All the procedures used to select the most promising populations to generate superior inbred lines for resistance to P. pachyrhizi presented similar results and identified the BR01-18437 x BRS 232 population as the best for inbred line selection.
