Efeitos do estresse hídrico sobre o desempenho germinativo da semente de faveira (Clitoria fairchildiana R.A. Howard. - Fabaceae) de diferentes tamanhos
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Data
2008-01-01
Autores
Silva, Breno Marques da Silva e [UNESP]
Carvalho, Nelson Moreira de [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Associação Brasileira de Tecnologia de Sementes (ABRATES)
Resumo
Clitoria fairchildiana R. Howard, vulgamente conhecida como faveira, é uma espécie arbórea utilizada na arborização e recomendada para recuperação de áreas degradada, pois é capaz de atuar como adubo verde. No entanto, há poucos estudos básicos para compreender seus atributos ecológicos e fisiológicos. Desse modo, o presente trabalho teve por objetivo estudar as influências do tamanho da semente e de estresse hídrico sobre a germinação das sementes e vigor de plântulas de faveira. Foram usadas sementes pequenas, médias e grandes, postas para germinar em bandejas, com areia, sob condições de umedecimento de 25%, 50%, 75% e 100% da capacidade de retenção de água. A germinação não é afetada pelo tamanho da semente, mas sim pelo vigor, pois as sementes grandes e médias originam plântulas mais vigorosas. Água em excesso reduziu a porcentagem e a velocidade de germinação ao passo que, falta de água, reduziu o crescimento das plântulas.
Clitoria fairchildiana R. Howard, commonly known as faveira, is a widely used tree species in reforestation projects and is also recommended for the recovery of degraded areas, due to the possibility of its use as green manure. However, there are few basic studies to understand its ecological and physiological attributes. Thus, the objective of the present work was to study the influence of seed size and water stress on the seed germination and seedling vigor in faveira. Four repetitions of 25 small, medium, and large seeds were sown in washed and sterilized sand moistened with water to 25, 50, 75, and 100% of its water holding capacity. In accordance with the results, it was concluded that seed germination was not affected by seed size whereas seedling vigor was, since large and medium-sized seeds gave rise to more vigorous seedlings. Water excess reduced total and speed of seed germination whereas lack of water reduced seedling growth.
Clitoria fairchildiana R. Howard, commonly known as faveira, is a widely used tree species in reforestation projects and is also recommended for the recovery of degraded areas, due to the possibility of its use as green manure. However, there are few basic studies to understand its ecological and physiological attributes. Thus, the objective of the present work was to study the influence of seed size and water stress on the seed germination and seedling vigor in faveira. Four repetitions of 25 small, medium, and large seeds were sown in washed and sterilized sand moistened with water to 25, 50, 75, and 100% of its water holding capacity. In accordance with the results, it was concluded that seed germination was not affected by seed size whereas seedling vigor was, since large and medium-sized seeds gave rise to more vigorous seedlings. Water excess reduced total and speed of seed germination whereas lack of water reduced seedling growth.
Descrição
Palavras-chave
germinação, vigor, Leguminosae, germination, vigor, Leguminosae
Como citar
Revista Brasileira de Sementes. Associação Brasileira de Tecnologia de Sementes, v. 30, n. 1, p. 55-65, 2008.