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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
09/10/1991 |
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Data da última atualização: |
18/03/2025 |
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Autoria: |
HU, C. Y. |
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Título: |
Light-mediated inhibition of in vitro development of rudimentary embryos of Ilex opaca. |
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Ano de publicação: |
1976 |
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Fonte/Imprenta: |
American Journal of Botany, Bronx, v. 63, n. 5, p. 651-656, 1976. |
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Idioma: |
Inglês |
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Conteúdo: |
The mature seeds of Ilex opaca Ait. contain rudimentary heart-shaped embryos. When excised embryos of cv. Farage were grown in vitro with a 16-hr photoperiod, only 20 % reached germination size after 13-day incubation, while 75% of the embryos reached the same stage when incubated in darkness. This light inhibitory effect increased with the length of daily light exposure as the daily photoperiod reached 4 hr. Nearly 50% growth reduction resulted as the cultures were preincubated in light continuously for 2 days before a 10-day dark incubation. After 4 days of light incubation the inhibitory effect could no longer be reversed by the subsequent dark incubation. Once the heart-shaped embryos started to grow in darkness they become progressively insensitive to subsequent light inhibition. After a 6-day initial dark incubation the embryos become immune from the inhibitory effect of light. This light inhibitory effect on in vitro embryo growth was universal in all 11 tested cultivars. |
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Palavras-Chave: |
Development. |
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Thesagro: |
Cultura In Vitro; Semente. |
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Thesaurus Nal: |
Ilex opaca. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
null
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Registro original: |
Embrapa Florestas (CNPF) |
