Water stress in germination, growth and development of coffee cultivars
The aim of this study was to evaluate the effect of water stress on the germination of Coffea arabica seeds and the growth and development of plants from these seeds. Seeds of the cultivars Bourbon Vermelho, Mundo Novo, and BA-10 were placed to germinate in the dark at 30 ºC in the presence and abse...
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Published in: | Journal of seed science Vol. 40; no. 1; pp. 82 - 89 |
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Main Authors: | , , , |
Format: | Journal Article |
Language: | English |
Published: |
ABRATES - Associação Brasileira de Tecnologia de Sementes
01-03-2018
Associação Brasileira de Tecnologia de Sementes |
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Online Access: | Get full text |
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Summary: | The aim of this study was to evaluate the effect of water stress on the germination of Coffea arabica seeds and the growth and development of plants from these seeds. Seeds of the cultivars Bourbon Vermelho, Mundo Novo, and BA-10 were placed to germinate in the dark at 30 ºC in the presence and absence of 100 g/L of polyethylene glycol 6000. The water stress applied delayed the beginning of seed germination by seven days in relation to seeds of the control, which had achieved responses of up to 50%, but there were no differences between the treatments at the end of the experiment. Furthermore, the length of the primary root in seeds germinated under water stress was less than in the control treatment, especially for the cultivar Mundo Novo. Plants of the cultivars Bourbon Vermelho and Mundo Novo developed from seeds previously germinated under water stress exhibited reduced height and fewer leaf pairs than those from the control, whereas ‘BA-10’ responded in a similar way in both treatments. Thus, the cultivars Bourbon Vermelho and Mundo Novo were more sensitive to the water stress applied in the germination phase than ‘BA-10’.
Resumo: O objetivo deste estudo foi avaliar o efeito do estresse hídrico na germinação de sementes de Coffea arabica e o crescimento das plantas provenientes destas. Sementes das cultivares Bourbon Vermelho, Mundo Novo e BA-10 foram colocadas para germinar na presença e ausência de 100 g/L de Polietilenoglicol 6000, no escuro, a 30 ºC. O estresse hídrico aplicado atrasou o início da germinação das sementes em sete dias em relação àquelas do controle que tinham atingido respostas de até 50%, porém não houve diferenças entre os tratamentos no final do experimento. Além disto, as sementes germinadas sob estresse hídrico tiveram redução do comprimento da raiz primária em relação àquelas do controle, principalmente, para o Mundo Novo. Plantas das cultivares Bourbon Vermelho e Mundo Novo desenvolvidas a partir das sementes previamente germinadas sob estresse hídrico tiveram redução da altura e do número de pares de folhas em comparação com aquelas provenientes do controle, enquanto a cultivar BA-10 respondeu de forma semelhante nos dois tratamentos. Assim, as cultivares Bourbon Vermelho e Mundo Novo foram mais sensíveis ao estresse hídrico aplicado na fase de germinação que o ‘BA-10’. |
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ISSN: | 2317-1537 2317-1545 2317-1545 |
DOI: | 10.1590/2317-1545v40n176667 |