low input agriculture
plant genetic resources
Springer Online Journal Archives 1860-2000
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Abstract Several morphological and agronomical traits and four independent isozyme loci (PGI1-2, TO1, GOT1 and AcPH) were determined on 20 natural tetraploid populations of Dactylis glomerata subsp. marina and on 7 diploid populations of subsp. izcoi from Galicia (Spain), grown as spaced plants on a sloping, acid sandy loam with summer drought and no fertilization. Diploid izcoi established quicker, had better winter and spring growth, higher summer disease resistance and yield in the first year, but less persistence under these conditions and less variability. There was no winter or summer dormancy in either subspecies. Heading date was positively correlated with summer disease resistance. Allozyme frequencies were not related to geographic distribution, but persistence was correlated with the percentage of heterozygous loci. There was genetic overlap between the two subspecies, suggesting natural gene flow through tetraploid izcoi. Leaf epidermal papillosity in marina was not correlated with regrowth after a dry summer, but early heading and WSC content were related to that regrowth. PGI1-2 and TO1 frequencies of 20 additional Galician izcoi populations (10 diploids and 10 tetraploids) are also presented.
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