Mutual Effect of TIBA and NAA on the Development of Xylem in Ricinus communis
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概要
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The mutual effect of TIBA and NAA exogeneously applied to the horizontally placed hypocotyles of Ricinus communis, which were in a stage of growth in thickness, was studied on the basis of anatomical observations. A lot of tracheary elements developed in a definite area in xylem depending on the site applied by TIBA, such as (1) in an area along both lateral portions contiguous to the applied part and in that at the edge of the applied part in case in which the application was made to the lower side alone, (2) in an area at the top edge of the applied part in case in which it was made to the upper side alone, and (3) in areas at the top and basal edges of the applied part in case in which it was separately made to both upper and lower sides simultaneously. All the evidence points to the fact that the development of tracheary elements is a response to high levels of auxin concentrations induced through blockade of basipetal transport due to the effect of TIBA. Xylem formed on the upper side in case in which the application of TIBA was separately made to the upper side and that of NAA to the lower side of the same horizontal hypocotyles simultaneously is composed of somewhat enlarged cells with thick and highly lignified walls, relative to that formed on the upper side of the horizontal hypocotyles in which TIBA was applied to the upper side alone or that formed on the upper side of those in which NAA was applied to the lower side alone. On the other hand, xylem formed on the lower side of the horizontal hypocotyles in which the application of TIBA and NAA was reversely made to the respective sides is identical to that formed on the lower side of the horizontal hypocotyles in which TIBA was applied to the lower side alone, in points of the shape of cells and the degree of lignification, but differs from that formed on the lower side of those in which NAA was applied to the upper side alone, in points of the shape of cells, the degree of lignification and the formation of tracheary elements. These observations suggest that lateral transport of auxins occurred with the force of gravity is inhibited by TIBA, but the diffusional one against it is not, and that TIBA and NAA have a counteracting effect mutually on development of xylem. The fact that xylem cells formed under the effect of TIBA contained a lot of starch grains may suggest that TIBA involves carbohydrate metabolism by some means still unknown.
- 奈良教育大学の論文
- 1971-10-30
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- Mutual Effect of TIBA and NAA on the Development of Xylem in Ricinus communis