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Non-geotropic Growth Curvatures in the Striga Radicle

C. N. WILLIAMS
Annals of Botany
New Series, Vol. 26, No. 104 (OCTOBER 1962), pp. 647-655
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42908622
Page Count: 10
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Non-geotropic Growth Curvatures in the Striga Radicle
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Abstract

When seedlings of the root parasite Striga asiatica Benth. (= S. lutea Lour.) are grown in the absence of the host the radicle grows to a length of about 4 mm. On emergence the radicle shows a strong curvature which is brought about by a failure of cell extension on one side. The inhibited cells generally remain unextended throughout the life of the seedling. Neither the sodium salt of indole-3-acetic acid nor Inhibitor-β (which is present in the seeds), induced permanent inhibitions to the radicle cells when applied externally, as did the endogenous curvature factor. 2:3:5-tri-iodobenzoic acid reduced curvature by promoting extension of the normally inhibited cells.

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