Translocação e compartimentalização de Zn em função de doses aplicadas em feijoeiro e cafeeiro via radicular
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Data
2005-05
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Ciência Rural
Resumo
O objetivo do presente trabalho foi avaliar a mobilidade e a compartimentalização de Zn aplicado via radicular em feijoeiro e cafeeiro. Foram instalados dois experimentos em casa de vegetação, em solução nutritiva, em sistema de vasos geminados, sendo o sistema radicular igualmente dividido nos dois recipientes. Em um dos recipientes geminados, adicionou-se uma solução sem Zn e, no outro, foram aplicadas doses crescentes do elemento (0,0; 0,5; 1,0; 2,0; 3,0; 4,0mmol L-1) na forma de ZnSO4, as quais constituíram os tratamentos no delineamento em blocos ao acaso com quatro repetições. O Zn apresentou mobilidade no floema do feijoeiro, indicando ser retranslocado da parte aérea para o sistema radicular. Já no cafeeiro, o Zn demonstrou praticamente imobilidade no floema. As plantas de feijoeiro apresentaram resposta linear crescente, em função das doses de Zn, para o teor Zn nas diferentes partes analisadas. Plantas de cafeeiro apresentaram mínima alteração no peso da matéria seca e teor de Zn na parte aérea. O caule apresentou-se como um local de concentração de Zn, tanto em cafeeiro como em feijoeiro.
Two experiments were conducted aiming at evaluating translocation and compartmentation of zinc applied on roots of bean and coffee seedlings in greenhouse grown in nutrient solution. The plants were grown in geminate containers system and nutrient solution containing 0.0; 0.5; 1.0; 2.0; 3.0; 4.0mmol L-1 of zinc by ZnSO4, which constituted the treatments. The dry matter and total zinc concentration were determined in the stems, roots, upper leaves and lower leaves. Total zinc analysis showed translocation of zinc towards the roots in bean, indicating zinc mobility in phloem of these plants. However, in coffee seedlings zinc showed minimum mobility in phloem. The bean plants presented linear increasing in zinc concentration in the different analyzed parts because of treatments. Coffee seedlings showed minimum alteration in the dry matter and zinc concentration in the aerial part. The stem showed to be a concentration location of zinc, so much in coffee and bean seedlings as weel.
Two experiments were conducted aiming at evaluating translocation and compartmentation of zinc applied on roots of bean and coffee seedlings in greenhouse grown in nutrient solution. The plants were grown in geminate containers system and nutrient solution containing 0.0; 0.5; 1.0; 2.0; 3.0; 4.0mmol L-1 of zinc by ZnSO4, which constituted the treatments. The dry matter and total zinc concentration were determined in the stems, roots, upper leaves and lower leaves. Total zinc analysis showed translocation of zinc towards the roots in bean, indicating zinc mobility in phloem of these plants. However, in coffee seedlings zinc showed minimum mobility in phloem. The bean plants presented linear increasing in zinc concentration in the different analyzed parts because of treatments. Coffee seedlings showed minimum alteration in the dry matter and zinc concentration in the aerial part. The stem showed to be a concentration location of zinc, so much in coffee and bean seedlings as weel.
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Palavras-chave
Coffea arabica, Phaseolus vulgaris, Micronutriente, Mobilidade, Coffea arabica, Phaseolus vulgaris, Micronutrient, Mobility