水稲の出葉と葉原基分化に及ぼす重力の影響

概要

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The present paper reports the influence of gravitational stimulus on the differentiation and emergency of rice leaves and gives a brief idscussion. The emerging rate of leaves is delayed in the horizontal plot for the first seven days compared with that in the vertical one, in either case of soil culture and water culture. But the final number of leaves at the end of the experiment becomes more numerous in the horizontal plot than in the vertical. In the horizontal plot, the sheath and blade of leaves to emerge newly decrease in length as compared with those in the vertical. This fact is conspicuously observed in the sheath of the first leaf and the second to emerge just after a start of the treatment, and in the blade of the leaves to emerge thereafter. It was microscopically confirmed that trie differentiation of leaf primordia is more accelerated in the seedlings kept horizontally than those kept vertically, whether the seedlings left intact were grown in hydroponics at the room temperature for ten days or those with roots and leaf blades excised were sealed into test tubes individually and kept in darkness at 30゜C for three days. All these facts suggest that the unilateral stimulation of gravity on rice axes has an effect to promote the differentiation of leaf primordia and to fasten the emergency of leaves after the axes would recover an errect posture.
奈良教育大学の論文