Indian Society of Genetics & Plant Breeding

Important

INTERRELATIONSHIPS OF SUBSPECIES OF ORYZA SATIVA AS REVEALED BY GRAIN AND EMBRYO SIZE

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BOTH the inheritance and the heritability of the shape and size of the paddy
grain are of considerable interest to rice breeders. Sakai and Pinto (1959)
have reported that heritability for seed size was highest for seed length and
width in F
2 populations and lowest in pure line varieties. Tinarelli (1956)
on the other hand, reported earlier that there was slight differences in mean
length of the grains in three lots of the same pure line grown at different
localities. He attributed this difference to the influence of environment.
Yamaguchi (1962) more recently has reported that genetic variance for grain
length and width were both increased by irradiation. He concluded that these
two characters were under separate ploygenic control. Bollich (1961), however, believed that spikelet length is governed by at least two and probably
three or more factors. He found transgressive segregation for both long and
short spikelets. Roy Choudhury (1961) after studying 36 varieties of true
breeding
aman paddy has reported that more than 90 per cent. of variation in
length and breadth and 84 per cent. in thickness of the grains are due to
differences in the genotypes of the different varieties.
  

Info

Year: 1966
Volume: 26
Issue: 1
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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