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Vergara - 1976 - Physiological and morphological adaptability of ri

Vergara - 1976 - Physiological and morphological adaptability of ri

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172 CLINIATE AND RICE<br />

Dividing cells (no lrool lip)<br />

200<br />

I80<br />

I60<br />

I40<br />

80-<br />

TOm__<br />

Q_l— 1 l l l J l<br />

O 45 4O 35 3O 25 2O l5<br />

Temperature (“Cl<br />

4. Intensity at‘ cell division <strong>and</strong> elongation nt“ cortical<br />

cells in mot tips grown under va<strong>ri</strong>ous temperatures (Yamakawn<br />

<strong>and</strong> Kishikawa, 1957).<br />

Shimizu (1958) studied the effect <strong>of</strong>lmv‘ temperature on mitotic activity in the<br />

cclls <strong>of</strong> vegetative shoot apex in <strong>ri</strong>cc plants. Mitosis was normal at lemperatures<br />

above 20°C. but it proceeded very sl\\=l_\_' at 15°C <strong>and</strong> entirely ceased<br />

at 10°C.<br />

Protoplasmic<br />

streaming<br />

The rate <strong>of</strong> protoplasmic streaming in root hair cells increases with <strong>ri</strong>sing<br />

temperature. llourexier. it decreases suddenly when the temperature goes<br />

over a limit. Doi (1950) estimated this changing temperature for some crop

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