Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Atmospheric Absorption of Fluoride by Cultivated Species. Leaf Structural Changes and Plant Growth

Full text
Author(s):
Mesquita, Geisa Lima [1] ; Ossamu Tanaka, Francisco Andre [2] ; Cantarella, Heitor [1] ; Mattos, Jr., Dirceu [3]
Total Authors: 4
Affiliation:
[1] Inst Agr, Ctr Citricultura Sylvio Moreira, BR-13012970 Sao Paulo - Brazil
[2] Univ Sao Paulo, Escola Super Agricultura Luiz Queiroz, BR-13418900 Sao Paulo - Brazil
[3] Inst Agr, Ctr Citricultura Sylvio Moreira, BR-13490000 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: WATER AIR AND SOIL POLLUTION; v. 219, n. 1-4, p. 143-156, JUL 2011.
Web of Science Citations: 16
Abstract

Fluoride (F) is an air pollutant that causes phytotoxicity. Besides the importance of this, losses of agricultural crops in the vicinity of F polluting industries in Brazil have been recently reported. Injuries caused to plant leaf cell structures by excess F are not well characterized. However, this may contribute to understanding the ways in which plant physiological and biochemical processes are altered. A study evaluated the effects of the atmospheric F on leaf characteristics and growth of young trees of sweet orange and coffee exposed to low (0.04 mol L(-1)) or high (0.16 mol L(-1)) doses of HF nebulized in closed chamber for 28 days plus a control treatment not exposed. Gladiolus and ryegrass were used as bioindicators in the experiment to monitor F exposure levels. Fluoride concentration and dry mass of leaves were evaluated. Leaf anatomy was observed under light and electron microscopy. High F concentrations (similar to 180 mg kg(-1)) were found in leaves of plants exposed at the highest dose of HF. Visual symptoms of F toxicity in leaves of citrus and coffee were observed. Analyses of plant tissue provided evidence that F caused degeneration of cell wall and cytoplasm and disorganization of bundle sheath, which were more evident in Gladiolus and coffee. Minor changes were observed for sweet orange and ryegrass. Increase on individual stomatal area was also marked for the Gladiolus and coffee, and which were characterized by occurrence of opened ostioles. The increased F absorption by leaves and changes at the structural and ultrastructural level of leaf tissues correlated with reduced plant growth. (AU)

FAPESP's process: 08/09541-6 - Effects of atmospheric fluoride leaf uptake on plant growth, nutritional status and metabolism
Grantee:Dirceu de Mattos Junior
Support Opportunities: Regular Research Grants