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GrainGenes Reference Report: PBR-120-129

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Reference	PBR-120-129
Title	Genetic analysis of the nitrogen and phosphorus utilization efficiencies in mature spring barley plants
Journal	Plant Breeding
Year	2001
Volume	120
Pages	129-132
Author	Gorny AG Sodkiewicz T
Abstract	Summary: Inheritance of the efficiency of nitrogen and phosphorus utilization in grain production was studied in diallel hybrids of spring barley. Effects of varied NPK fertilization and soil moisture on the genetic variance was evaluated at maturity in pot- and field-grown plants. A preponderance of general combining ability effects was found for the efficiency ratios and utilization efficiencies, suggesting that the generative efficiency indices were mainly controlled by an additive genetic system. However, the relatively high narrow-sense heritabilities (0.33-0.81) found under optimal conditions tended to decline to 0.00-0.36 following water and nutrient shortages. The importance of non-additive gene effects for utilization efficiencies was demonstrated in the field under reduced nutrition. This leads to the conclusion that the involvement of additive gene action should facilitate selection efforts only under favourable environments. Selection delayed until later hybrid generations should be used when trying to improve the nutrient efficiency of barley under less favourable nutrition conditions
Keyword	[ Hide all but 1 of 45 ] barley barley plants combining ability environment fertilization field gene gene action general combining ability generation genetic genetic analysis genetic variance genotype heritability hordeum vulgare hybrid hybrids inheritance involvement lead low-input breeding maturity moisture nitrogen nutrient nutrient efficiency nutrition phosphorus phosphorus utilization phosphorus utilization efficiency plant maturity potassium production ratios selection soil soil moisture spring spring barley system triticum aestivum utilization efficiency variance water

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