Indian Society of Genetics & Plant Breeding

A correlation based response parameter proposed for varietal promotion/identification in coordinated varietal evaluation trials: A case study in bread wheat (Triticum aestivum L.)

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A parameter based on correlation coefficient between
deviations of yields of a variety from corresponding mean
yields recorded at several locations, and the estimates
of similar deviations for a check variety was used to
estimate response of each of the 44 varieties included in
National Initial Varietal Trial - Irrigated Timely Sown,
Coordinated Trial of bread wheat planted in North Western
Plains Zone and North Eastern Plains Zone during
1999-2000. Five well established standard check varieties
were also included in the trial for comparison. The
deviations in the yields of test entries from mean yield
of all the test entries and the checks were computed for
each location. The correlations between deviations of the
yields of a variety and those of each of the checks were
treated as measures of sensitivity or response. Significant
positive correlation was taken as a measure of similarity
between a variety and a check included in the pair while
recommending variety for promotion or identification. This
response estimate of a variety can be used as an additional
parameter along with yield potential and other desirable
characteristics conventionally used. Only thirteen test
entries exhibited similarity in response with the five check
varieties used. In the given example two varieties HD
2790 and WH 736 should have been promoted to the next
trial of higher order on being statistically identical in
sensitivity with standard check varieties HD 2329 and HP
1731, respectively. The variety HD 2790 was also
at par to the best check PBW 343 and superior
to all other checks in yield (qlha). Similarly variety WH
736 was significantly superior to all checks other than
PBW 343 in yield. The five check varieties differed In
sensitivity to varying agroecological conditions. The check
variety HUW 206 exhibited most co-adaptive nature and
had similarity with three test entries UP 2527, WH 738,
RW 3542 and a filler entry in sensitivity towards different
levels of agronomic management used at different

Keywords: Bread wheat, correlation coefficient, response par


Year: 2005
Volume: 65
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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