In this article:
Root exudates of plants of Vitis vinifera L. cv. Thompson Seedless, grown in nutrient cultures with root temperatures maintained at either 20o or 30o and with shoots at a common air temperature, were assayed for cytokinin activity.
The higher root temperature resulted in increased shoot and root elongation, increased dry matter accumulation by both shoots and roots, and also altered the morphological appearance of the roots.
Effect of Root Temperature on Cytokinin Activity in Root Exudate of Vitis vinifera L.
1967, Plant Physiology, vol 42, issue 8, month 8, pages 1131 – 1139
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