Seed size and quantitative characters in Avena barbata
نویسندگان
چکیده
منابع مشابه
Evolution of multilocus genetic structure in Avena hirtula and Avena barbata.
Avena barbata, an autotetraploid grass, is much more widely adapted than Avena hirtula, its diploid ancestor. We have determined the 14-locus genotype of 754 diploid and 4751 tetraploid plants from 10 and 50 Spanish sites, respectively. Allelic diversity is much greater in the tetraploid (52 alleles) than in the diploid (38 alleles): the extra alleles of the tetraploid were present in nonsegreg...
متن کاملDivergence and variation of quantitative traits between allozyme genotypes of Avena barbata from contrasting habitats
1 Avena barbata occurs as two multilocus allozyme genotypes associated with moist (mesic) and dry (xeric) habitats in California. We examined the divergence of quantitative traits between these genotypes, and heritable trait variation in the progeny of a cross. 2 A replacement series showed that the mesic genotype was competitively superior to the xeric. Early germination could alter this compe...
متن کاملRoot Influence on Nitrogen Mineralization and Nitrification in Avena barbata Rhizosphere Soil
Micro–N pool dilution was used to quantify rates of gross N mineralization, consumption, and nitrification in bulk soil and in soil within 2 mm of root sections of Avena barbata (slender wild oats), an annual grass common to California oak woodland-savannas. Rates of gross N mineralization in rhizosphere soil (9.2 mg N kgd) were about ten times higher than in bulk soil (1.0 mg N kgd). Total bac...
متن کاملWater stress alters the genetic architecture of functional traits associated with drought adaptation in Avena barbata.
Environmental stress can alter genetic variation and covariation underlying functional traits, and thus affect adaptive evolution in response to natural selection. However, the genetic basis of functional traits is rarely examined in contrasting resource environments, and consequently, there is no consensus regarding whether environmental stress constrains or facilitates adaptive evolution. We ...
متن کاملPatterns of Genetic Differentiation in the Slender Wild Oat Species Avena barbata.
Allozyme frequencies at five enzyme loci were determined for 14 California populations of Avena barbata, a species introduced to California from the Mediterranean Basin during the colonization of North America. Allelic frequencies at these loci were also determined in Mediterranean collections of this species. The pattern of divergence of the California populations from the ancestral gene pool ...
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ژورنال
عنوان ژورنال: Heredity
سال: 1984
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1984.4