Source-sink manipulations in Coffea arabica L. and its effect on growth of shoots and root system

Ciência e Agrotecnologia

José Donizeti Alves²  Carlos Maurício Paglis¹  Darlan Einstein Do Livramento¹  Suellen Sarah Drumond Linhares¹  Frederico Biagi Becker¹  Alessandro Carlos Mesquita¹ 

[1] ,Universidade Federal de Lavras Departamento de Biologia Lavras MG

关键词: Carbohydrates;    source-sink;    coffee tree;    root system;    Carboidratos;    fonte-dreno;    cafeeiro;    sistema radicular;   

DOI  :  10.1590/S1413-70542011000500013

来源: SciELO

【 摘 要 】

This paper investigated changes in growth and carbohydrate content of shoots and root systems in response to source-sink manipulation in field-grown coffee trees. The source-sink manipulations were carried out using manual de-fruiting. Two plots of trees were established: in one group, the fruit was left on the tree, while in the second group all fruits were removed manually. Similar results were obtained for coffee trees with and without fruit in terms of height, stem and skirt diameter and branch lengths. A biochemical evaluation of the roots showed that no differences were found between the levels of carbohydrates. In the leaves, levels of soluble sugars and reducing sugars were higher in plants with fruit. The starch concentration in leaves and roots did not vary between the plots. Root length density did not vary between plants with and without fruit in the 0 - 0.4 m soil layer. However, plants without fruit had a higher root length density than plants with a full fruit load. These results contrast with results published by others on source-sink relationships of coffee plants. The joint data analysis shows that young trees, with a moderate fruit load, and with good nutritional and health status, produce carbohydrates in sufficient quantities to maintain vegetative and reproductive growth, without harming root system growth.

【 授权许可】

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