10.1590/S0102-33061994000100011

Efeitos de diferentes tratamentos na germinação do pequi (Caryocar brasiliense Camb.) Effects of different treatments in the germination of pequi (Caryocar brasiliense Camb.)

Abstract

Sementes de pequi (Caryocar brasiliense Camb.) provenientes de frutos coletados do chão e "de vez", foram submetidas aos seguintes tratamentos: choques térmicos úmido (80ºC/15 min) e seco (80ºC/15 min e 50ºC/30, 60, 90 e 120 min), ácido giberélico 100mg/l e 6 benzil aminopurina 10-4M durante 24 horas, ácido sulfúrico conc./ 1 hora e lavagem em água corrente/48 horas. Sementes provenientes de frutos coletados do chão, com parte do mesocarpo removido, e "de vez", com mesocarpo íntegro, foram armazenadas a 5º C durante 30 dias, seguido ou não pela adição de GA3 100 mg/l. Observou-se que a germinação do pequi começa consistentemente a partir do 9.º mês após o plantio não havendo diferença significativa entre a porcentagem de germinação de sementes provenientes de frutos colhidos "de vez" (85%) e completamente maduros (67%). Tratamentos das sementes com temperatura de 80ºC durante 15 min. com ácido sulfúrico concentrado durante 1 hora e estratificação a 5ºC durante 30 dias prejudicaram o processo germinativo. Os demais tratamentos não apresentaram diferenças em relação ao controle.<br>Seeds of pequi (Caryocar brasiliense Camb.) collected from fallen fruits on the soil surface under the tree and those from maturing fruits still on the tree were submitted to the following treatments: humid heating (80ºC/15 min), dry heating (80ºC/15 min and 50ºC during 30,60,90 and 120 min), gibberellic acid 100 mg/1 (24h) and 6-benzylamynopurine 10-4M (24h), concentrated sulphuric acid (1 h) and running tap water (48h). Seeds of fruits collected from the soil surface, with part of the mesocarp removed, and those maturing fruits from the tree, with intact mesocaip, were stored at 5ºC during 30 days, followed or not by addition of GA3 100mg/l. It was observed that seed germination started consistently 9 months after sowing and that there was no significant difference between germination of seed proceeding from maturing fruits (85%) and those collected from the soil surface (67%). Seeds treated with 80ºC/15 min., with conc. sulphuric acid 1 h and stratified at 5ºC during 30 days germinated at a smaller percentage than controls. Other treatments did not affect significantly seed germination when compared with the control

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oai:doaj.org/article:2fa80d8525d141389c3ddadd825429d3Last time updated on 12/18/2014

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