Abstract
Principal component analysis has been used on annual measures of vegetative and reproductive activity of young apple trees. The trial consisted of four clones (M.2, M.4, M.9, and M.16) used as both rootstock and scion in all possible combinations to give 16 tree types. The results have suggested that these annual records can best be summarized by their sum and linear trend with time. Further analyses using these new measures of sum and trend have enabled the effects of rootstock and scion to be partitioned. Increase in stem dry weight is largely rootstock-controlled but trend with time is mainly scion-controlled. The reverse occurs with fruit number where total fruit is largely scion-controlled but the trend is dominated by the rootstock. Measures of leader growth are intermediate between stem growth and fruiting in their responses. Statistical interactions are greatest with fruiting records which suggests that this activity is less harmoniously controlled by rootstock and scion than other activities. Use of sum and linear trend is recommended for future analyses of apple tree trials without recourse to further multivariate analyses.
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