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Efeito do alumínio em plantas de Pinhão-Manso (Jatropha curcas L.), cultivadas em solução nutritiva
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Advisor(s)
Abstract(s)
Quantidades elevadas de alumínio (Al3+) limitam o desenvolvimento de muitas espécies vegetais,
inibindo o crescimento de suas raízes. O pinhão-manso (Jatropha curcas L.) tem sido estudado
amplamente para a produção de biodiesel e, apesar de ser tolerante em solos com baixa fertilidade, as
raízes do pinhão-manso não se desenvolvem em solos ácidos. Este trabalho teve como objetivo avaliar
o desenvolvimento e a resposta fisiológica de diferentes acessos de pinhão-manso em doses variadas
de alumínio. Plântulas obtidas de sementes provenientes de São Paulo, Minas Gerais e Bahia foram
submetidas a estresse de alumínio, nas concentrações 0; 3,0; 4,5 e 6,0 mg L-1 em solução nutritiva, sendo
avaliados os parâmetros: massa fresca da parte aérea (MFPA), massa fresca da raiz (MFR), massa seca
da parte aérea (MSA), massa seca da raiz (MSR), comprimento inicial da raiz antes da submersão em
solução (CIR) e crescimento final da raiz após submersão em solução (CFR). Para as variáveis MFPA,
MFR e MSR, os acessos provenientes de Minas Gerais e Bahia apresentaram médias superiores em
relação aos de São Paulo. As doses de alumínio diferiram para as variáveis MFR e CFR após submersão
em solução, sendo que estes resultados ajustados à equações lineares descendentes. O crescimento da
espécie é afetado pela presença de alumínio, mesmo para as menores doses e independe da procedência.
As doses de alumínio afetam o crescimento das raízes para todas as procedências, sendo as doses
superiores a 3 mg L-1, as mais prejudiciais ao crescimento.
High amounts of aluminum (Al3+) limit the development of many plant species, inhibiting the growth of roots. The physic nut (Jatropha curcas L.) has been studied extensively for the production of biodiesel and despite being tolerant to low fertility soils, the roots of physic nuts do not developed in acid soils. This study aimed to evaluate the development and physiological responses of different accessions of physic nuts in varying doses of aluminum. Seedlings obtained from seeds from São Paulo, Minas Gerais and Bahia, were subjected to aluminum stress at concentrations of 0, 3.0, 4.5 and 6.0 mg L-1 in nutritive solution, with the following parameters: fresh matter of shoot (MFPA), fresh matter of root (MFR), dry matter of shoot (MSA), dry matter of root (MSR), initial length of root before submersion in solution (CIR) and growth of root end after submersion in solution (CFR). For variables MFPA, MFR and MSR, the access from Minas Gerais and Bahia presented higher relative mean different from São Paulo provenance at levels of 5% and 1% significance, respectively. The doses of aluminum showed significant differences for the variables MFR and CFR after submersion in solution, and those results are explained by descendants linear equations. Based on these results, it was noticed that the growth of the species is affected by the presence of aluminum, even considering small levels and independently of the provenance. The doses of aluminum affect root growth for all provenances, with doses above 3 mgL-1, the most harmful to plant growth.
High amounts of aluminum (Al3+) limit the development of many plant species, inhibiting the growth of roots. The physic nut (Jatropha curcas L.) has been studied extensively for the production of biodiesel and despite being tolerant to low fertility soils, the roots of physic nuts do not developed in acid soils. This study aimed to evaluate the development and physiological responses of different accessions of physic nuts in varying doses of aluminum. Seedlings obtained from seeds from São Paulo, Minas Gerais and Bahia, were subjected to aluminum stress at concentrations of 0, 3.0, 4.5 and 6.0 mg L-1 in nutritive solution, with the following parameters: fresh matter of shoot (MFPA), fresh matter of root (MFR), dry matter of shoot (MSA), dry matter of root (MSR), initial length of root before submersion in solution (CIR) and growth of root end after submersion in solution (CFR). For variables MFPA, MFR and MSR, the access from Minas Gerais and Bahia presented higher relative mean different from São Paulo provenance at levels of 5% and 1% significance, respectively. The doses of aluminum showed significant differences for the variables MFR and CFR after submersion in solution, and those results are explained by descendants linear equations. Based on these results, it was noticed that the growth of the species is affected by the presence of aluminum, even considering small levels and independently of the provenance. The doses of aluminum affect root growth for all provenances, with doses above 3 mgL-1, the most harmful to plant growth.
Description
Keywords
Toxidez Alumínio Biodiesel Toxicity Aluminum Biofuel . Escola Superior de Tecnologias e Gestão
Citation
Macedo, F. L. de, Pedra, W. N., Silva, S. A. da, Barreto, M. C. de V., & Silva-Mann, R. (2011). Efeito do alumínio em plantas de Pinhão-Manso (Jatropha curcas L.), cultivadas em solução nutritiva. Semina: Ciências Agrárias, 32(1), 157–164. https://doi.org/10.5433/1679-0359.2011v32n1p157
Publisher
Universidade Estadual de Londrina