title: Genotype-dependent variation in the transpiration efficiency of plants and photosynthetic activity of flag leaves in spring barley under varied nutrition.
abstract: In the study, spring barley genotypes of various origin and breeding history were found to show a broad genetic variation in the vegetative and generative measures of the whole-plant transpiration efficiency (TE), photosynthesis (A) and transpiration (E) rates of flag leaves, leaf efficiency of gas exchange (A/E) and stress tolerance (T) when grown till maturity in soil-pots under high and reduced NPK supplies. Broad-sense heritabilities for the characteristics ranged from 0.61 to 0.87. Significant genotype-nutrition interactions were noticed, constituting 19-23% of the total variance in TE measures. The results suggest that at least some 'exotic' accessions from Ethiopia, Syria, Morocco and/or Tibet may serve as attractive genetic sources of novel variations in TE, T and A for the breeding of barleys of improved adaptation to less favourable fertilisation.
authors: Institute of Plant Genetics, Polish Academy of Sciences, Poznań, Poland.
authors: Anetta
authors: A
authors: Krzemińska
authors: Andrzej G
authors: AG
authors: Górny
mesh_terms: D000704:Analysis of Variance; D005838:Genotype; D001467:Hordeum / Q000235:genetics* / Q000378:metabolism; D010788:Photosynthesis / Q000235:genetics* / Q000502:physiology; D018515:Plant Leaves / Q000235:genetics* / Q000378:metabolism; D018526:Plant Transpiration / Q000235:genetics* / Q000502:physiology