ADAPTABILITY AND PATH ANALYSIS IN AMERICAN COTTON (Gossypium hirsutum L.)
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Date
1996
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The present investigation entitled "Adaptability
and path analysis in American cotton (Gossypium hirsutum L.)"
were conducted to study G x E interaction, nature of stability
of different genotypes of cotton and direct and indirect
contribution of various components towards yield. The field
experiments comprising of sixteen genotypes were conducted in
R.B.D. with three replications at Cotton Improvement Project.
M.P.K.V., Rahuri during 1995 under three environments (sowing
dates) viz., 5th May (E1), 5th June (E2) and 5th July (E3).
The observations were recorded on sixteen important yield
components and quality characters. G x E interaction was detected for all the sixteen
characters studied. Linear component contributed major portion
of the total G x E for height of the plant, number of
monopodia per plant, days to 50 per cent flowering and boll
weight, where as non-linear component was found to be
significant for all the characters except number of monopodia
per plant. Linear component was also important for the
expression of all the characters except number of bolls per
plant. Estimates of environmental indices (Ij) indicated 5th
June sowing (E2 environment) as the most favourable
environment for yield and its components, followed by E^ and
E3 environments. Considering the nature of stability, no
genotype was observed to be high yielding and stable. Further,
RHC-0890 was stable for monopods, sympods, early flowering,
and early boll bursting, while RHC-1189 for sympods, early
flowering and early boll bursting, lint yield and maturity
coefficient and PKV-081 for early flowering, and early boll
bursting, ginning percentage and mean fibre length. The
genotype CNH-36 had above average stability for sympodia per
plant and early flowering, while RHC-1190 for sympodia per
plant and boll weight. The genoytpes PH-23, PKV-081. RHC-2688
and CNHPT-203 exhibited above average stability for plant
height, monopodia per plant, late flowering and boll weight,
respectively. The genotype GB-20 showed below average stability for monopodia per plant, late flowering, boll number
per plant and seed cotton yield per plant, while genotype 6
3302 for plant height and monopodia per plant. The genotypes
CNH-36, CNHPT-203, NH-262-1 and KOP-498 showed below average
stability for monopodia per plant, late flowering, early
flowering and boll weight, respectively.
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