دورية أكاديمية
Studies on mineral nutrition of the coffee plant (Coffea arabica L. cv. Catuaí Vermelho): LXIV. Remobilization and re-utilization of nitrogen and potassium by normal and deficient plants
العنوان: | Studies on mineral nutrition of the coffee plant (Coffea arabica L. cv. Catuaí Vermelho): LXIV. Remobilization and re-utilization of nitrogen and potassium by normal and deficient plants |
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المؤلفون: | O. F. de Lima Filho, E. Malavolta |
المصدر: | Brazilian Journal of Biology, Vol 63, Iss 3, Pp 481-490 (2003) |
بيانات النشر: | Instituto Internacional de Ecologia, 2003. |
سنة النشر: | 2003 |
المجموعة: | LCC:Science LCC:Biology (General) LCC:Zoology LCC:Botany |
مصطلحات موضوعية: | re-utilization, remobilization, nitrogen, potassium, rubidium, coffee plants, 15N, 85Rb, Science, Biology (General), QH301-705.5, Zoology, QL1-991, Botany, QK1-989 |
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. |
نوع الوثيقة: | article |
وصف الملف: | electronic resource |
اللغة: | English |
تدمد: | 1678-4375 1519-6984 |
العلاقة: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842003000300014&tlng=enTest; http://www.scielo.br/pdf/bjb/v63n3/a14v63n3.pdfTest; https://doaj.org/toc/1678-4375Test |
DOI: | 10.1590/S1519-69842003000300014 |
الوصول الحر: | https://doaj.org/article/4c88dd766a5346edb7c2e01d4f0c3a01Test |
رقم الانضمام: | edsdoj.4c88dd766a5346edb7c2e01d4f0c3a01 |
قاعدة البيانات: | Directory of Open Access Journals |
تدمد: | 16784375 15196984 |
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DOI: | 10.1590/S1519-69842003000300014 |