| Autor: |
Gordon, Dennis C., MacDonald, Ian R., Hart, James W. |
| Předmět: |
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| Zdroj: |
Plant, Cell & Environment; Oct1982, Vol. 5 Issue 5, p347-353, 7p |
| Abstrakt: |
A system is described whereby seedling development can be analysed in terms of growth rates of specific 1 mm regions of the hypocotyl. The technique involves time-lapse photography of marked hypocotyls in a specially designed chamber which accommodates seedlings in various orientations with respect to gravity, and under irradiation regimes differing in light quality, quantity and direction. The results of preliminary study of upward growth of etiolated or green cress seedlings in darkness or overhead white light are reported. Highest growth rates in etiolated seedlings were observed in zones in the upper one-third of the hypocotyl. In green seedlings, growth was more prominent within the subapical zones. Light further restricted growth of the median and basal zones in both types of seedling. However, in their immediate responses to the onset of irritation, green and etiolated seedlings differed markedly. In etiolated seedlings, recovery of growth at the apex was accompanied by the development of inhibition in the median-basal regions; green seedlings showed a transient inhibition of growth in the apical zone together with a strong immediate inhibition in the median-basal regions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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