水稲体に与えたIAA-C14の移動・分布に及ぼす重力の影響について
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概要
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The present experiment was planned to ascertain with radioactive indoleacetic acid applied exogeneously whether or not the total free auxin contents in the stem of rice plant horizontally laid are more abundant than those in the vertical one, as well as whether or not the distribution is biassed in the horizontal stem. As materials the rice plants which were at the stage of the commencement of internodal growth and had no tiller were employed. Following the pretreatment in which the plants were horizontally kept for an hour with the axis in such a manner that the midribs of leaves developing on both sides of the axis were located on the same horizontal plane, aqueous solution of indoleacetic acid-2-C14 was made to take in from the apical cut surface of the uppermost unfolded foliage leaf, i. e. the eighth leaf for three hours. Immediately after that one half of the materials and three hours after that the other half were each dissected in a cold room and stocked in a freezing box. Radioactivities detected in alcohol extracts of the dissections were compared to those of control plants in the erect position with the following results. Considerably low radioactivities were recovered from the roots and matured leaves except the seventh leaf in both erect and horizontal plants. Although radioactivities were recovered most highly in amounts from the leaf to which the source had been applied, and much from the leaves above the emerging, it was noteworthy that the activity in the horizontal plant was higher on the former, and was lower on the latter than that in the vertical, respectively. The radioactivity detected on the whole stem three hours after the cessation of application is much higher in the vertical than in the horizontal, though that immediately after is somewhat higher in the latter than in the former. A tendency like this, three hours after the cessation, is also seen in comparison of the amount of radioactive substances extracted into alcohol from the dissected stem piece between the site just below the fourth leaf node and the site just below the eighth leaf node including the most part of elongating internodes. From the above it follows that in the stem either horizontally kept or vertically the average specific radioactivity is increased in amount with the passage of time, and the vertical one is rather superior to the horizontal in the rate of increase. It was also found that the specific radioactivity of the upper half and the lower in the same horizontal stem piece showed a ratio of thirty-nine to sixtyone immediately after the finish of application and of thirty-two to sixty-eight three hours after, respectively. These evidences seem to demonstrate that the unilateral pull of gravity decreases the rate of transport of auxins and exerts complicated influences upon the distribution of those and/or other substances involved in the formative and metabolic activities in the horizontal rice plant.
- 奈良教育大学の論文
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