Physiological genetics of character associations in hybrid rice
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Date
2001
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Department of Plant Breeding and Genetics, College of Horticulture, Vellanikkara
Abstract
The studies were conducted at the College of Horticulture, Vellanikara, to
analyse the "Physiological Genetics of character associations in Hybrid rice
(Oryza Sativa L.) ". The study mainly aims to characterize the morpho-
metabolic associations in plant attributes that contribute to higher productivity
in hybrid rice. Three hybrids and their parental genotypes were evaluated to.
understand how different genotypes may compliment one another
physiologically and also to identify the stages at which the better physiological
efficiency contribute heterosis.
From this study, it was revealed that the heterotic advantages result in
two ways VlZ., generalized morphologic improvement in growth and yield
attributes and efficiency enhancement. The results also envisages the
importance of heterotic functional efficiency over morphological efficiency.
The stability of chlorophyll aJb ratio and the differential changes of Nrase
enzyme activity, both at different phenophases shall serve as a better index for
selection of genotypes in rice breeding programme.
The pattern of biochemical character like soluble protein, enzymes like
Peroxidase, catalase revealed that the magnitude of physiological expression is
independent of genetic 'capabilities or genetic expressivity is conditioned by
physiology of the plant.
The soluble protein and enzyme activity at tillering phase appears to be
the most critical in deciding the yield of the rice, in order to achieve a
complete heterotic effect' in rice breeding. The biochemical as well as
physiological aspects at different growing stages should be given due
importance
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