Seed quality evaluation in American cotton (Gossypium hirsutum L.)
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Date
2009
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Publisher
CCSHAU
Abstract
Seed quality plays an important role in the crop establishment and
overall performance of the crop. With an array of possible viability and
vigour tests available, appropriate procedures of evaluating seed
performance is a very difficult job but a necessity. Keeping these aspect
in view present investigation is carried out to evaluate different seed lots
of American cotton and comparative efficacy of seed viability and vigour
test as predictor of standard germination and seedling establishment.
The eighteen seed lots of three varieties were subjected to various
viability, vigour tests with three replications, and observations were
recorded on standard germination, seedling length, seedling dry weight,
vigour index – I , vigour index – II, seed weight, seed density, electrical
conductivity, dehydrogenase activity, tetrazolium test, pH exudates test,
accelerated ageing, field emergence index and seedling establishment.
Results revealed that significant mean squares values showed the wide
variation among the seed lots for all parameters studied. Among all the
18 seed lots 15th seed lot has been found superior for all the viability
and vigour parameters except seedling length, vigour index-1, seed
weight, seed density. On the contrary, 8th and 11th seed lots found to be
inferior for all the viability and vigour parameters except seedling length,
seed weight, seed density. In respect of varieties, H-1226 was found to
be superior for most of the parameters whereas H-1117 was found to be
inferior for most of the parameters.
All the parameters were significantly correlated with standard
germination (except seed weight) and seedling establishment (except
seed weight and seed density). The electrical conductivity significantly
and negatively correlated with standard germination and seedling
establishment. Tetrazolium test followed by vigour index-2 showed
highest reliabilityfor prediction of standard germination whereas
standard field emergence index followed by tetrazolium test njshowed
the highest reliability for prediction of seedling establishment. pH
exudate test, tetrazolium test and vigour index-2 had highest positive
direct effect on standard germinatin, seedling establishment and
seedling dry weight respectively.
Correlation coefficient analysis, regression analysis and path
coefficient analysis revealed that vigour and viability parameters like
tetrazolium test, DHA test, vigour indices, electrical conductivity,
accelerated ageing, pH test and seedling dry weight can be used as
reliable predictors of standard germination and seedling establishment
in American cotton. The pH exudates test and tetrazolium test were
preferably most suitable because of easy, quick and cost effective in their
execution.
Description
Keywords
Cotton, Biological phenomena, Animal developmental stages, Eggs, Biological development, Planting, Poultry equipment, Amrasca biguttula, Vegetables, Relative humidity