Boron mobility in eucalyptus clones

Revista Brasileira de Ciência do Solo

Jackson Freitas Brilhante De São José²  Ivo Ribeiro Da Silva²  Nairam Felix De Barros²  Roberto Ferreira Novais²  Eulene Francisco Silva²  Thomas Jot Smyth¹  Fernando Palha Leite¹  Flancer Novais Nunes²  Fabrício Oliveira Gebrim² 

[1] ,Federal University of Viçosa Soil Science Department Viçosa MG ,Brazil

关键词: micronutrient;    forest nutrition;    translocation;    polyol;    micronutriente;    nutrição florestal;    translocação;    polyol;   

DOI  :  10.1590/S0100-06832009000600022

来源: SciELO

【 摘 要 】

Understanding the magnitude of B mobility in eucalyptus may help to select clones that are more efficient for B use and to design new practices of B fertilization. This study consisted of five experiments with three eucalyptus clones (129, 57 and 58) where the response to and mobility of B were evaluated. Results indicated that clone 129 was less sensitive to B deficiency than clones 68 and 57, apparently due to its ability to translocate B previously absorbed via root systems to younger tissues when B in solution became limiting. Translocation also occurred when B was applied as boric acid only once to a single mature leaf, resulting in higher B concentration in roots, stems and younger leaves. The growth of B-deficient plants was also recovere by a single foliar application of B to a mature leaf. This mobility was greater, when foliar-applied B was supplied in complexed (boric acid + manitol) than in non-complexed form (boric acid alone). When the root system of clone 129 was split in two solution compartments, B supplied to one root compartment was translocated to the shoot and back to the roots in the other compartment, improving the B status and growth. Thus, it appears that B is relatively mobile in eucalyptus, especially in clone 129, and its higher mobility could be due to the presence of an organic compound such as manitol, able to complex B.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License