Translocation and accumulation of dry matter in winter wheat genotypes
In the years 2003 and 2004, diametrically different in temperature, in total amount of precipitation and in its distribution during vegetation, winter wheat lines in generations F 4 and F 5. originated from seven crossings, and with three local adapted varieties, were examined in field experiments. This study was conducted to assess effects of year and genotype on the rate of biomass produced till anthesis from total one at maturity and the rate of photosynthate produced before anthesis in grain. In hot and dry conditions of the year 2003, in comparison to 2004 (higher precipitation, lower temperature), lower total biomass was produced (1258 g.m −2 to 1859 g.m −2), higher rate of accumulated biomass till anthesis (60 % to 52 %) and higher portion of translocated biomass in grain (15 % to −13.6 %), and lower grain yield (591 g.m −2 to 782 g.m −2) were observed. Differences occurred among crossings and lines within crossing in ratio of photosynthate produced till anthesis in grain. The ratio of translocated photosynthate in grain on one side and grain yield and total produced biomass on the other side, were negative correlated. Genotypes with high proportion of translocated dry matter in grain are recommended for marginal growing areas. For intensive growing areas, genotypes with high biomass production and with higher biomass portion from anthesis to maturity are required. Rate of translocated biomass in grain depends on the harvest index, and on the portion of biomass produced till anthesis from the total one.
Key wordstranslocation dry matter winter wheat F4 and F5 generations lines
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