Abstract
ABSTRACT: Vale do Rio Doce shoot dieback (VRDSD) is an anomaly whose cause seems to be associated with hypoxic conditions and their consequences (excess Mn and Fe) triggered by elevation of the water table in areas with poor drainage. Different plants have distinct survival strategies under this form of stress. The objective of this study was to understand the physiological responses involved in the differential tolerance of eucalyptus clones to VRDSD and their relationship to hypoxia and excess Mn. A [...]
Highlights
Vale do Rio Doce shoot dieback in eucalyptus (VRDSD) occurs with higher intensity in soils located at the bottom of valleys (Inceptisols) and in soils of alluvial origin (Fluvisols) in locations with poor drainage (Leite et al, 2014)
The sensitive clone had a lower reduction in growth, whereas the tolerant clone exhibited a more pronounced reduction under hypoxia
Higher production of dry matter in the sensitive clone compared to the tolerant one (Figure 1) was explained by the escape mechanism adopted by these plants
Summary
Vale do Rio Doce shoot dieback in eucalyptus (VRDSD) occurs with higher intensity in soils located at the bottom of valleys (Inceptisols) and in soils of alluvial origin (Fluvisols) in locations with poor drainage (Leite et al, 2014). The symptoms of VRDSD, characterized by brown lesions, wilting, rapid leaf loss, and wrinkling and cracks on the lateral branches, evolve rapidly, leading to the death of the apical meristem and eventually the whole plant (Ferreira and Milani, 2002; Leite et al, 2014). Clones sensitive to VRDSD have high levels of Mn in the leaves. These authors assume that the highest intensity of symptoms observed at the age of establishment (third or fourth year after planting) are due to conditions favorable to disease development at that time. As the planted forest ages, developing greater leaf area, the transpiration rate increases, reducing the hypoxia condition by increasing the water flow through the system (soil/plant/atmosphere), such that VRDSD is not observed in plantations over four years old
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