Indian Society of Genetics & Plant Breeding
BREEDING of rust resistant varieties is a complex problem, since the breeder is confronted
with two variable biological organisms which interact with each other differently under
different environmental conditions. In view of this, Stakman (1954) has stressed
the need for collecting exact information on the genetic potentialities for resistance in
different wheat varieties. Genetic studies in polyploid plants, such as bread wheat,
are complicated by the presence of several factors with complementary, compensatory
or inhibitory effect controlling each character. Other minor or modifying genes also
render the correct classification of individual phenotypes difficult. The establishment of the monosomic series in bread wheat by Sears (1939, 1944) has, however,
resolved this handicap. The usefulne~s of aneuploids in determining the mode of
inheritance of rust resistance in varieties of bread wheat has already been demonstrated
by Heyne and Livers (1953), Plessers (1954), Wiggin (1955), Sears and Rodenhiser
(1948), Sears et al., (1957), Campbell and McGinnis (1958), Unrau et al., (1958),
Knott (I 959) and Singh and Swaminathan (1960). The present study was undertaken to locate, by monosomic analysis, the chromosome or chromosomes of the
wheat variety N. P. 790 on which genes for resistance to race 21 and 15c of stem
rust (Puccinia graminis tritici (Pers.) Erikss. and Henn.) are situated. These two
races are widely prevalent and are very virulent and as such are of importance in wheat
breeding work.
Year: 1960
Volume: 20
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
M. P. SINGH and M. S. SWAMINATHAN info_circle
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