Germination Responses of Anisacanthus wrightii (Torr.) Gray (Acanthaceae) to Selected Environmental Variables

Abstract
A. wrightii seed germination and radicle growth were greatest at 35.degree. C and rapidly decreased at temperatures > 35.degree. C. Seeds germinated equally well in light and dark and had no after-ripening requirements. Treatments which decreased water availability significantly reduced germination and radicle length. Germination percentages and radicle growth of seeds in aqueous media were not significantly different between pH 4 and 7 but were significantly reduced at pH values of 8 and 9. Germinability of A. wrightii seeds decreased rapidly after 33 mo. dry storage and the seeds did not germinate, during a 10-day test period, after 42 mo.

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