Source-sink manipulation as a postanthesis stress tolerance screening technique in spring barley
1995
Zofajova, A. | Uzik, M. (Research Inst. of Plant Production, Piestany (Slovakia))
Manipulating grain number per spike means trying to change the ratio of source to sink. The aim of this work was to find the reaction of genotypes to a reduction of grain number in grain weight and N content in the grain. During 1992 and 1993 14 local (Slovak) varieties of spring barley were tested for reaction to grain number reduction treatments. Spikelets were removed along one side of the spike. In both years treated plants had a higher grain weight on average by 113.3 percent (1992) and 105.1 percent (1993) with a range between varieties from 102.5 - 135.7 percent (1992) and 96.3-137.1 percent (1993) and in the same order: N-content, 125.7 percent, 104.0-151.0 percent, 121.7 percent, 103.1 - 135.3 percent. There were weak relations between the treated and untreated variants in grain weight (r=0.559/1992), (r=0.388/1993) and also in N content (r=0, r=0.259). The increase in grain weight and N-content of treated plants were higher in smaller grain weight varieties (r=0.858 sup (++), -0.287) and lower N-content ones. Varieties with a low grain weight and a low N content had probably higher postanthesis source limitations
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