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Effect of temperature on the cell division in root tips of rice plant, with special reference to diurnal variation of water temperature, and low temperature



Effect of temperature on the cell division in root tips of rice plant, with special reference to diurnal variation of water temperature, and low temperature



Agric Bull Saga Univ 11: 45-54



Many investigations concerning the effects of temperature on the growth of rice plant have been performed by many workers so far, but relatively little has been known about the relation between cell division and cell elongation in the root tips, and temperatures. The present experiments were conducted to clarify the effects of diurnal variation of water temperature in midsummer on cell division in root tips of the cultivated rice, Oryza sativa, and to determine the effects of such low temperature as 5[degree]C and 10[degree]C on cell elongation and cell division in them. The results are summarized as follows: The number of dividing cells in variable temperature plot (27[degree] - 40[degree] C) gradually decreased with increase in water temperature, reaching minimum number of mitotic figures during the term of high temperature, increasing steadily towards night, then showing maximum number at 2:00 a.m., contrary to the fact that cell division of root tips in constant temperature plot was proceeded normally with 2 maxima and 2 secondary maxima of mitosis. The intensity of cell division indicated by total number of mitotic figures per root tip observed for 24 hours was 11,755 (100) in constant temperature plot followed by 6526 (56) in variable temperature plot. Such inhibiton of mitosis should be sufficiently effective to cause undesirable effects to the growth and physiological functions of roots. With the increase of water temperature to as much as 39[degree]C vaculation in cytoplasm of cells began to occur in mitotic zone and the vacuoles became gradually large. In 2 low temperature plots, the mitotic process in the root tips was extremely inhibited as compared with control plot (25[degree]C), showing less intensity at 5[degree]C than at 10[degree]C. Ratios of total number of mitotic figures in the respective plots were 100 in control, 70 in 10[degree]C and 38 in 5[degree]C. The elongation of cortical cells in the root tips which receivedthe low temperature treatment showed a marked inhibition as compared with control plot (25[degree]C), but no significant difference between the elongations in 2 low temperature plots was seen.

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The effect of temperature on cell division in root tips of rice, with special reference to the relations between this and diurnal changes in water temperature and low temperature.. Saga Daigaku Nogaku Iho/Agric. Bull. Saga Univ, 11, 45-56, 1960

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