Inheritance of flag leaf angle in two rice (Oryza sativa) cultivars
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Date
2012
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Abstract
The leaf posture of a genotype determines the amount of solar radiation intercepted by the genotype. The flag leaf in cereals has been recognized to contribute largely to the filling of grains because it supplies photosynthetic products mainly to the panicle. Genetic segregation patterns were studied in two lowland rice (oryza sativa) genotypes with different flag leaf angles, Nerica L19 or WAB2155 (with horizontal flag leaf angle) and WAS161-B-9-3or Nerica L 41 (with erect flag leaf angle). Data were obtain at grain filling for all the generations, there were six generations including the two parents (P1and P2), F1and F2, and the backcrosses with each parent (BC1 and BC2). Genetic differences were detected among genotypes with erect flag leaf and horizontal flag leaf. Segregant data showed the existence of one gene (3:1 ratio) controlling the expression of flag leaf angle. Data suggest that efficient selection for erect flag leaf type in rice is possible and that considerable genetic improvement can be expected for flag leaf angle. Heritability estimate as well as F2 frequency distribution of plant height, panicle length, 1000 seed weight, flag leaf length, spikelet per plant, number of tillers and number of panicle per plant indicated the presence of additive and non additive effects in the control of the traits. Transgressive segregation towards the shorter parent was observed for flag leaf length and plant height.
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A Thesis submitted to the School of Graduate Studies, Kwame Nkrumah University of Science and Technology, Kumasi, in partial fulfilment of the requirements for the Degree of Master of Science in Plant Breeding, August-2012