The action of the testa upon the germination of seeds ofCucumis anguria L. |
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Authors: | V. J. M. Cardoso G. M. Felippe |
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Affiliation: | (1) Depto. de Botanica, UNESP, CEP 13500, C.P. 178 Rio Claro SP, Brasil;(2) Depto. de Fisiologia Vegetal, UNICAMP, Campinas, Brasil |
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Abstract: | In negatively photoblastic seeds of Cucumis anguria L. the scarification of micropyle overcame the inhibitory effect of “white light ”, although far-red radiation inhibited the germination in both intact and scarified seeds. The moistened testa powder transmitted more far-red than red radiation. Thus the testa could act as a filter of radiation and maintain a high far-red/red ratio at the photosensitive site of the embryo, which must be localized near the micropyle. |
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