Scale for evaluaton of the occurrence of burrknots in apple trees
Keywords:
Malus spp., root aerial nodules, assessment methodology, phenotypic characterizatonAbstract
Abstract - Burrknots are aerial root nodules that obstruct the vascularization of apple plants, which can cause depletion of the fruit tree. Usually, the evaluation of the occurrence of this disorder is restricted to the rootstock region. The objective of the study was to develop a scale for the evaluation of the occurrence of burrknots in the apple trees, and to present a practical application of the developed scale. Plants with different intensities of burrknots along the stem and branches were observed, which were classified into five phenotypically distinct groups for this disorder (scale 1 to 5). In the practical application of the scale, 12 segregating populations of apple trees were phenotypically evaluated, which allowed to characterize the individual and average behavior of the progenies, and to identify the parents with greater potential of transmitting this character to their hybrids. The suggested scale was efficient in the evaluation of the occurrence of burrknots in apple trees, demonstrating their applicability in studies with different purposes.
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