Histological Aspects of Root Formation in Petioles of Detached Leaves of Pereskia grandifolia (Cactaceae): Natural Conditions and Effects of GA3 and Dark |
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Authors: | CARVALHO MARIA ANGELA M; MONTEIRO WALKYRIA R; DIETRICH SONIA M C |
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Institution: | *Sefdo de Fisiologia e Bioquimka de Plantas, Institute de Botdnica, Caixa Postal 4005, 01051 Sdo Paulo, SP, Brazil
Dcpartamento de Botdnica, Jnstituto de Biociincias, Universidade de S5o Paulo Caixa Postal 11461, CEP 05499, Cidade Unwersitdria, 01000 SHo Paulo, SP, Brasil |
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Abstract: | Adventitious roots arise naturally on petioles of Pereskia grandifoliaHaw. held in light. At about the 12th day after the beginningof the experiment, the root primordia arise in a callus tissuedeveloped from the basal portion of the petiole. Associatedwith the development of the callus, noticeable structural changesoccur in the originating organ. Petioles maintained in darkalso form callus; however, they die in a few days. On the otherhand, petioles treated with GA,, maintained in light, developcallus and survive; but they do not give rise to roots. Someaspects are discussed, such as: the kind of origin observedfor the roots, and the possible physiological basis for theirformation, as wdl as for the inhibition of their appearance Pereskia grandifolia, adventitious root formation, gibberelljc acid, petiole structure, rooting |
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