Influence of Chilling upon Seedling Development of Cotton

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Abstract
Cotton seed in a germination environment were subjected to 2 types of temperature regimes. One consisted of a cold-warm treatment of an unfavorably low temperature (5[degree] or 10[degree]C) at the onset of seed hydration followed by growth at 31[degree], and a 2nd consisted of an unfavorably low temperature (5[degree] or 10[degree]) after initiation of germination at 31[degree] for 1 day. Injury was assessed by measuring subsequent growth at a favorable temperature and noting morphological and anatomical symptoms. A cold-warm regime caused radicle meristem abortion and an initial growth lag prior to normal subsequent development rate. A warm-cold-warm regime caused drastic reductions in growth rate, and death or inactiva-tion of cortex tissue. Sloughing of the cortex was also noted.

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