Germination of "Solo" papaya seeds treated with plant hormones

Abstract

-The aim of this study was to investigate the effects of some plant hormones on germination of Carica papaya L. seeds of the "Solo" group taken from fruits at maturity stages 3 and 5 (50% and 75% of the fruit skin showing a yellow color). Then, the seeds were subjected to treatments involving different combinations of acid 2-chloroethylphosphonic -(CEPA 0; 5 x 10 -7 and 5 x 10 -4 M), GA 3 (0; 10 and 50 mg / L) and KNO 3 (0 or 1 M), and germination was assessed at the 14th and 30th days. Seeds from fruits at maturity stage 3 showed increased germination when treated with all growth regulators tested. KNO 3 promoted a decrease in germination and in the germination speed index, especially in the seeds from stage 5. The plant hormones did not promote any increase in percentage of normal seedlings of papaya seeds. Two-Chloethylphosphonic acid (5 x 10 -4 M) and the gibberellic acid applied alone in the seeds from satge 3 promoted an increase in the number of normal seedlings 14 days after sowing.Index terms: Carica papaya, CEPA, AG, phytohormones, KNO 3 . Germinação de sementes de mamão tratadas com fitohormôniosRESUMO -Sementes de mamão têm germinação lenta e desuniforme o que tem sido atribuído à dormência pós-colheita. Objetivou-se com o presente trabalho avaliar os efeitos de reguladores de crescimento na germinação de sementes de mamão grupo "Solo". As sementes foram extraídas de frutos nos estádios de maturação 3 e 5, que correspondem a 50% e mais que 75% da superfície externa amarela, respectivamente. Em seguida, foram submetidas a tratamentos constituidos por diferentes combinações de ácido 2-cloroetilfosfônico -CEPA (0; 5 x 10 -7 e 5 x 10 -4 M), GA 3 (0; 10 e 50 mg / L) e KNO 3 (0 ou 1 M), avaliando-se a germinação aos 14 e 30 dias. Verificou-se aumento da germinação das sementes no estádio 3 de maturação quando tratadas com os reguladores de crescimento testados. O KNO 3 teve efeito negativo na germinação e no índice de velocidade de germinação, principalmente nas sementes do estádio 5. Não houve efeito dos reguladores de crescimento na porcentagem final de plântulas normais. O CEPA (5 x 10 -4 M) e as giberelinas empregadas isoladamente promoveram aumento do número de plântulas normais das sementes no estádio 3, aos 14 dias após a semeadura.

Effect of gibberellic acid and potassium nitrate seed treatments on the emergence and seedling vigor of Amaranth and Cleome gynandra

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Role of Plant Growth Regulators on Seed Germination of Papaya – A Review

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