Dry matter partitioning and mineral composition of roots, stems and leaves of guava grown under salt stress conditions
| Autor: | Raimundo Gonçalves Ferreira, Fernando Felipe Ferreyra Hernandez, Francisco José Alves Fernandes Távora |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2001 |
| Předmět: |
medicine.medical_treatment
Agriculture (General) solução salina resposta da planta salt solutions S1-972 Nutrient Botany medicine Dry matter lcsh:Agriculture (General) Saline Completely randomized design plant response Psidium Chemistry lcsh:S1-972 Salinity Horticulture Psidium guajava Shoot sodium chloride Positive relationship Animal Science and Zoology cloreto de sódio Agronomy and Crop Science |
| Zdroj: | Pesquisa Agropecuária Brasileira, Vol 36, Iss 1, Pp 79-88 (2001) Pesquisa Agropecuária Brasileira v.36 n.1 2001 Pesquisa Agropecuária Brasileira Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA Pesquisa Agropecuária Brasileira, Volume: 36, Issue: 1, Pages: 79-88, Published: JAN 2001 |
| ISSN: | 1678-3921 |
| Popis: | Um experimento em casa de vegetação foi conduzido com o objetivo de estudar a resposta de plantas de goiabeira (Psidium guajavaL.) a diferentes concentrações de NaCl. As plantas foram cultivadas em solução nutritiva, com 0, 25, 50, 75, 100, 125 e 150 mM de NaCl, e colhidas com 30 e 50 dias após estresse, num delineamento inteiramente casualizado. Foram determinadas: matéria seca das raízes e parte aérea; e porcentagens de Na, Cl, K, Ca e Mg nas raízes, caule e folhas. O estresse salino reduziu a matéria seca total, e a relação parte aérea/raiz foi reduzida. O estresse causou um aumento nos níveis dos íons Na+ e Cl-, com maior acúmulo nas folhas, seguido das raízes. Os teores de Ca foram estáveis nas raízes, mas decresceram no caule e folhas. Os teores de K foram reduzidos, particularmente nas folhas. Ao contrário, os teores de Mg não foram afetados pela salinidade no caule e nas raízes, havendo, entretanto, redução nas folhas. O teor de Na apresentou relação direta com o de Cl e inversa com o de K nas raízes e folhas. O teor de Ca não variou com o de Na nas folhas, mas apresentou uma relação inversa nas raízes. O teor de Mg não variou com o de Na nas raízes e folhas. A greenhouse experiment was conducted with the objective of studying the response of guava plants (Psidium guajavaL.) to increasing levels of NaCl concentrations. Plants were grown in nutrient solutions, with 0, 25, 50, 75, 100, 125 and 150mM of NaCl, and harvested 30 and 50 days after saline stress in a complete randomized design. The following traits were studied: shoot, root and total plant dry matter and the percentage of Na, Cl, K, Ca and Mg in plant dry matter. Dry matter yield decreased when salinity increased. The root/shoot ratio decreased with the saline treatment. Salinity stress caused an increase in the levels of Na+ and Cl-. The highest ion accumulation was found in the leaves followed by the roots. The Ca levels were stable in the roots, but decreased in stems and leaves. The K content was reduced with the increased levels of salinity, particularly in the leaves. On the other hand, Mg levels were not affected by salinity in stems and roots but decreased in the leaves. There was a positive relationship between Na and Cl and a negative relationship between Na and K concentration in roots and leaves. Mg concentration in leaves and roots did not vary with the concentration of Na. The concentration of Ca did not vary with Na in the leaves but showed an inverse relationship in the roots. |
| Databáze: | OpenAIRE |
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