Genotypic and nutrition-dependent variation in water use efficiency and photosynthetic activity of leaves in winter wheat (Triticum aestivum L.).

摘要: Effects of high and reduced NPK nutrition on the genetic variation components water use efficiency at leaf whole-plant levels were examined in pot-grown old modern cultivars winter wheat (Triticum aestivum L.). At subsequent growth stages, photosynthetic rate (A), transpiration (E), area (LA) gas exchange (A/E) measured fully developed 4th, 5th, penultimate flag leaves. plant canopy level, total amount transpired was recorded during whole life cycle to determine vegetative (WUEveg) grain (WUEgen) matter formation. Considerable genotypic differences found for characters studied. The limited supply caused a decrease LA, A A/E, but contributed an increase WUEgen. Examined (C) did not interact with (N) these characteristics. However, position leaves (L) C x L N interactions significantly affected variance A/E negatively correlated photosynthetically less active efficient per unit than lower WUE be more genetically stable Some tended form higher older ones, this corresponds formation former. Stay-green duration harvest index showed positive correlations no close associations noticed between stress tolerance, usually tolerant shortage.