In this article:
The paper describes an experiment in which an attempt was made to maintain vine roots at prescribed relative sizes over a prolonged period in order to assess effects on shoot growth. Grapevines wore established in water culture.
Shoot length and leaf number were measured after imposing four levels of root-pruning treatment.
The results are interpreted to indicate that roots are the source of a growth substance required for normal shoot growth.
Proportional Reduction in Shoot Growth of Grapevines with Root Systems Maintained at Constant Relative Volumes by Repeated Pruning
1968, Australian Journal of Biological Sciences, vol 21, pages 1095 – 1101
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