Palavras-chave -Paepalallllzus speciosus, Eriocaulaceae, germinação, fotoblasti smo, campo rupestre.ABSTRACT -(Effects of thermic shocks in the germination of Paepalanrflus speciosus Koern. Eriocaulaceae). Seeds of Paepalanrlllls speciosus Koern . -Eriocaulaceae, when enclosed into naked fruits and in the diaspores, showed tolerance ar thermi c shock until 70 ll C during 30 mino and this capacity was not modified when the thermic shock happened 24 h after the imbebition. Seed photoblastism was not affected by treatment with temperatures from 35 to 80 0 C dUling 30 min o These resu lts showed that seeds of P. speciosus have high capacity of survival at temperature developed durin g the burn of annual occurrence on "campo rupestre".
Recebido em 24.1O.9l. Aceito em 1l.07.94. RESUMO -(Efeitos de diferentes tratamentos na germinação do pequi (CQI)ocar brasilienseCamb.)). Sementes de pequi (CQI)ocar brasiliense Camb.) provenientes de frutos coletados do chão e "de vez", foram submetidas aos segu intes tratamentos: choques térmicos úmido (80 0 C/15 min) e seco (80"C/15 min e 50 0 C/30, 60, 90 e 120 min), ácido giberélico 100mg/l e 6 benzil aminopurina 10·4M durante 24 horas, ácido sulfúrico conc.! I hora e lavagem em ág ua corrente/48 horas. Sementes provenientes de frutos coletados do chão, com pm1e do mesocarpo removido, e "de vez", com mesocarpo íntegro, foram armazenadas a 5° C durante 30 dias, seguido ou não pela adição de GA, 100 mg/l. Observou-se que a germinação do pequi começa consistentemente a pm1ir do 9.° 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 80"C durante 15 mino com ácido sulfúrico concentrado durante I hora e estratificação a 5°C durante 30 dias prejudicaram o processo germinativo. Os demais tratamentos não apresentaram diferenças em relação ao controle.Palavras chave: Ca/)'ocar brasiliense, pequi, germinação, cerrado. ABSTRACT -(Effects of different treatments in the germination of pequi (CQI)ocar brasilienseCamb.)). Seeds of pequi (CQI)ocar brasiliellse 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 (80 0 C/15 min) , dry heating (80"C/15min and 50°C during 30,60,90 and 120 min), gibberellic acid 100 mg/l (24h) and 6-benzylamynopurine 10·4M (24h), concentrated sulphuric acid (I h) and running tap water (48h). Seeds offruits collected from the soil surface, with part of the mesocarp removed, and those maturing fruits from the tree, with intact mesocarp, were stored at 5°C during 30 days, followed or not by additi on of GA, 100mg/l. It was observed that seed germination started consistently 9 months a f ter sowing and that there was no significant difference
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