Indian Society of Genetics & Plant Breeding

Important

COMPARISON OF THE OBSERVED AND PREDICTED FREQUENCIES OF TRANSGRESSIVE SEGREGATES FOR YIELD AND RELATED TRAITS IN TWO BREADWHEAT POPULATIONS

Published on

The genetic parameters estimated in seven basic sets of generation mean analysis and Fl
triple test-cross progenies were used to predict the frequency of recombinant inbred lines
derivable from Fl breadwheat populations of Harrier XS308 and Redpoll XHD 2204 crosses
grown over two environments. The validity of predictions was tested by comparing the
expected frequency with the observed frequency of transgressive segregates scored on
family means of 183 F6lines. These lines were randomly derived through SSD in each of
the Fl populations. In majority of cases, a close goodness of fit was achieved between the
predicted and observed frequency of recombinant inbred lines. Recombinant inbred lines
were obtained exceeding the parental limits for plant height, peduncle length, 1OO-grain
weight and days to heading. The skewed distribution observed for predicted frequency of
recombinant inbreds was due to the presence of additive X additive type epistatic
interaction. The results of the experiments clearly demonstrated that genetic analysis of a
characterin earlygeneration ofa cross ofbreadwheatcan provide the necessaryinformation
to predict accurately the likely outcome of inbreeding in Fl. The breeding strategies for
recovery of recombinant inbred lines having desired level of performance has been
suggested.
 

Keywords: Breadwheat, transgressive segregation, cross performance, recombinant lines.

Info

Year: 1995
Volume: 55
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

Authors

info_circle

Download PDF