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The stability of grain yield
and its component characters were also examined. The available
evidence suggested the importance of component compensation in
conferring homeostasis for a complex trait like grain yield (Grafius
1956; Allard and Bradshaw 1964; Bains and Gupta 1972). The results
shown in Tables 2 and 3 suggested that any generalization regarding
stability of a genotype for all the characters was very confusing as
the genotypes studied did not exhibit uniform stability. Hybrid 65, a
high yielding rainfed variety which was stable for grain yield, was
stable in performance for number of grains per ear and 1000 grain
weight, though unstable for the number of ear-bearing tillers, due to
significant non-linear interactions. Similarly PBW 65 being stable
for grain yield was stable for 1000 grain weight, but unstable for
the number of grains per ear and the number of ear-bearing tillers.
The number of ear-bearing tillers was in general the most unstable
character under salt stress conditions. It was also observed that
varieties unstable for grain yield were mostly unstable for its
component characters. Bains and Gupta (1972) also observed highly
buffered population for grain yield as poor or average in buffering
ability for the component traits in wheat.
References
Allard RW and Bradshaw AD (1964) Implication of
genotypes-environment interactions in applied plant breeding. Crop
Sci 4: 503-508.
Bains KS and Gupta VP (1972) Stability of yield and yield components
in bread wheat. Indian J Genet 13: 306-312.
Breese EL (1969) The measurement and significance of genotype x
environment interactions in grasses. Heredity 24: 27- 44.
Eberhart SA and Russell WA (1966) Stability parameters for comparing
varieties. Crop Sci 6: 36-40.
Finlay FW and Wilkinson GN (1963) The analysis of adaptation in a
plant breeding programme. Aust J Agric Res 14: 742- 754.
Grafius JE (1956) Components of yield in oats-a geometrical
interpretation. Agron J 48: 419-423.
Mozafar A and Goodin JR (1986) Salt tolerance of two differently
drought tolerant wheat genotypes during germination and early
seedling growth. Plant and Soil 96: 303-316.
Paroda RS and Hayes X (197 1) An investigation of genotype
environment interactions on rate of ear emergence in spring barley.
Heredity 26: 157-175.
Rana RS (1978) Genetic diversity in wheat for tolerance to
salt-affected soils. In: Genetics and Wheat Improvement. Ed. Gupta
AK. Oxford &IBH, New Delhi, pp 180-184.
Singh KN and Rana RS (1984) Stability of wheat varieties suitable for
cultivation in normal as well as salt-affected soils. Indian J. Agric
Sci. 54 (11): 950-954
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