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Plant and Cell Physiology, 1986, Vol. 27, No. 4 651-659
© 1986

Article

Gibberellin Control of Microtubule Arrangement in the Mesocotyl Epidermal Cells of the d5 Mutant of Zea mays L.

Takashi Mita1 and Masayuki Katsumi2

Biology Department, International Christian University Osawa, Mitaka, Tokyo 181, Japan

2To whom correspondence should be addressed.

The mesocotyl length of dark-grown maize seedlings is much shorter in the dwarf (d5) than in the normal. The elongating zone of d5 mesocotyl is restricted to 1 mm below the coleoptilar node, while that of the normal extends to almost 4 mm. When the 4 mm portion below the node was marked at 1 mm intervals and designated as A, B, C and D from the top, gibberellin (GA3) particularly stimulated elongation of the A–B region of d5 and also C to some extent. Electronmicroscopic observation of microtubules in the epidermal cells of these regions of d5 showed that microtubules were longitudinally and/or randomly oriented in all other regions except the region immediately below the node. Following 100 µM GA3 treatment for 21 h, the microtubule arrangement became transverse to the cell axis in A and B. Even in C a significant number of transversely oriented microtubules were observed. On the other hand, in normal seedlings microtubules were oriented transversely to the cell axis in all four regions regardless of GA3 treatment. Results indicate that the dwarf habit of d5 seedlings can be ascribed to their possession of a small population of elongating cells, the microtubules of which are predominantly oriented transversely to the cell axis as a result of insufficient supply of endogenous gibberellin.

1Present address: Department of Cell Biology, National Institute for Basic Biology, Myodaiji, Okazaki 444, Japan.

(Received December 17, 1985; Accepted March 10, 1986)
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