Over Locations and Years Performance of Material Selected in One Location Under High Inputs at Low Plant Density from a Spring Rye Population
Three spring rye mixtures, produced after honeycomb selection at low plant density for four years in one high input location (Thessaloniki) and their original population were evaluated under different water stress conditions in a randomized complete block design, in two locations for two years. Soil type (fertility, soil water holding capacity) and water precipitation, especially during anthesis, were different in each location and year. The initial evaluation of the three mixtures in Thessaloniki (1995), where selection was applied, revealed that selection for yield at low plant density was effective. The performance of the mixtures, however, was different when the plants were evaluated in a second location, in the same year where no response to selection was observed. During the second year of evaluation, the water precipitation was different in Thessaloniki where there was no rain at all in May, the most crucial month for rye flowering in Hellas. This lack of rainfall affected negatively the behaviour of the mixtures. Thus, the original rye population characterized by a broader variability out yielded two of the mixtures in Thessaloniki, whereas no differences were recorded in the second location. The over years and locations performance also revealed no differences. This indicates that selection at low plant density and high selection pressure in one high input-location had as a result either the development of rye populations with narrow adaptability or that honeycomb selection was not effective in this case.
Keywordsresponse to selection spring rye inbreeding depression
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