ISSN:
1573-5060
Keywords:
Oryza sativa
;
rice
;
floating habit
;
genetics
;
linkage
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Deep water rice varieties in general have certain peculiar characters which are associated with floating habit. These characters are (i) early nodal differentiation, (ii) nodal rooting, (iii) spreading habit, (iv) awned grains, (v) brown hull colour, (vi) red pericarp (red rice), and (vii) seed dormancy. Inheritance of these characters and linkage relationship of genes governing these characters were studied in a cross between Pankaj (non floating) and Nageribao (floating) rice varieties. Nageribao, a cultivar from Assam possesses these characters. Early nodal differentiation was observed to be controlled by a single dominant gene, designated as ‘Nd’. Nodal rooting was controlled by two dominant complementary genes, designated as ‘Nr 1’ and ‘Nr 2’. We found an inhibitory factor for spreading habit and one for brown hull colour in Pankaj; the operation of two dominant duplicate genes ‘An 1’ and ‘An 2’ for controlling awning characters, a single dominant gene ‘Rd’ for red pericarp colour and a single dominant gene ‘Gd’ for grain dormancy. Joint segregations between these characters resulted in the assignment of genes in the X linkage group of indica rices with estimated map distances based on the cross-over values. The genes ‘An’ (awning), ‘Es’ (spreading habit), ‘Nr’ (nodal rooting) and ‘Nd’ (nodal differentiation) were observed to be associated with each other. The gene for red pericarp (Rd) was observed to be linked with the grain dormaney gene ‘Gd’.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00035427
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