Physiological quality of seeds as determined by an
emergence test is not enough to predict storage potential of
onion seeds (Stumpf et al., 1997). Alternatives for enhancing
and predicting storability are to be investigated. The rate of seed
deterioration is influenced by confounding environmental and
biological factors. High temperatures during storage enhance
seed deterioration as does high seed moisture content
(McDonald, 1999). Relative effects of seed moisture content
and temperature on longevity differ with species, and the
structural and biochemical composition of seeds. A complete
pattern of loss in viability could be understood on the basis of
seed moisture and storage temperature (Ellis et al., 1982).
Drastic fluctuations as well prevailing high humidity and
temperatures under sub-tropical Indian conditions aggravate
the loss of germination in stored onion seeds