Estudos sobre a nutrição mineral do cafeeiro (Coffea arabica L. cv. Catuaí Vermelho): LXIV. Remobilização e reutilização de nitrogênio e potássio por plantas normais e deficientes
| العنوان: | Estudos sobre a nutrição mineral do cafeeiro (Coffea arabica L. cv. Catuaí Vermelho): LXIV. Remobilização e reutilização de nitrogênio e potássio por plantas normais e deficientes |
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| المؤلفون: | Eurípedes Malavolta, O.F. de Lima Filho |
| المصدر: | Brazilian Journal of Biology, Vol 63, Iss 3, Pp 481-490 (2003) Brazilian Journal of Biology, Volume: 63, Issue: 3, Pages: 481-490, Published: AUG 2003 Brazilian Journal of Biology v.63 n.3 2003 Brazilian Journal of Biology Instituto Internacional de Ecologia (IIE) instacron:IIE |
| بيانات النشر: | Instituto Internacional de Ecologia, 2003. |
| سنة النشر: | 2003 |
| مصطلحات موضوعية: | remobilização, rubídio, QH301-705.5, Potassium, Science, chemistry.chemical_element, cafeeiro, reutilização, Biology, Coffee, Plant Roots, nitrogen, rubidium, lcsh:Botany, lcsh:Zoology, re-utilization, lcsh:QL1-991, Biology (General), lcsh:Science, Nitrogen cycle, lcsh:QH301-705.5, Plant Stems, Coffea arabica, potassium, 15N, Botany, potássio, Biological Transport, Nitrogen, nitrogênio, lcsh:QK1-989, Horticulture, remobilization, chemistry, Agronomy, QL1-991, lcsh:Biology (General), Fruit, QK1-989, lcsh:Q, 85Rb, General Agricultural and Biological Sciences, coffee plants, Zoology |
| الوصف: | Remobilization and re-utilization of 15N and 85Rb labelled nitrogen and potassium reserves for new growth and fruit formation was studied under greenhouse conditions using both normal and deficient young coffee plants. It was found that K reserves are used in higher proportion than is stored N by fruits and other organs. The export of N by organs of residence in the normal plants obeyed the following proportions of the total: leaves 47%-58%, branches and flower buds 21%-27%, roots 21%-32%. The corresponding figures in the case of deficient plants were: leaves 49%-65%, branches and flower buds 21%-27%, roots 14%-25%. Re-utilization of K took place in the following proportions in the normal plants: leaves 54%-64%, branches and flower buds 20%-21%, roots 30%-41%. In K deficient plants the figures were: leaves 62%-79%, branches and flower buds 1.2%-4.4%, roots 20%-33%. In tissues formed after the initiation of flowering buds, the demand for N is met by reserves as follows: normal plants: fruits 20.6%-24.8%, leaves 15.6%-19.4%, twigs 19%-20.5%; deficient plants: fruits 43.5%-48.5%, leaves 48.1%-51.9%, twigs 46%-53%. The K needs for new tissues are met in the order: normal plants: fruits 40%-45.8%, leaves 27%-37.6%, twigs 26%-33.1%; deficient plants: fruits 65.7%-81.5%, leaves 52.6%-68.4%, twigs 62%-86.1%. Fruits represent the main sink for both N and K. Re-utilization of both elements is higher in the case of deficient plants. A remobilização do N (15N) e do K (85Rb) de reserva e seu uso pelas diferentes partes do cafeeiro (Coffea arabica cv. Catuaí Vermelho) no período reprodutivo, particularmente pelos frutos, foram estudados sob condições normais e de carência de N ou K. O K de reserva, comparado ao N de reserva, é utilizado em maior proporção pelos frutos e demais órgãos do cafeeiro. A exportação do N pelos órgãos de reserva foi a seguinte: plantas normais - folhas (47%-58%); ramos + gemas florais (20%-21%); raízes (21%-32%). Plantas deficientes - folhas (49%-65%); ramos + gemas florais (21%-27%); raízes (14%-25%). A remobilização do K de reserva ocorreu na seguinte proporção: plantas normais - folhas (54%-64%); ramos + gemas florais (20%-21%); raízes (30%-41%). Plantas deficientes - folhas (62%-79%); ramos + gemas florais (1,2%-4,4%); raízes (20%-33%). Em tecidos lançados após a iniciação da gema floral, a demanda por N é coberta pelas reservas do cafeeiro com o seguinte porcentual: plantas normais - frutos (20,6%-24,8%), folhas (15,6%-19,4%), ramos (19,0%-20,5%); plantas deficientes: frutos (43,5%-48,5%); folhas (48,1%-51,9%); ramos (46,0%-53,0%). Para o K em plantas normais: frutos (40,0%-45,8%), folhas (27,0%-37,6%), ramos (26%-33,1%); plantas deficientes: frutos (65,7%-81,5%); folhas (52,6%-68,4%); ramos (62,0%-86,1%). |
| وصف الملف: | text/html |
| اللغة: | English |
| تدمد: | 1678-4375 1519-6984 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c988bb95f9253701e2a07fc871c8677cTest http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842003000300014Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....c988bb95f9253701e2a07fc871c8677c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 16784375 15196984 |
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