Root temperature effects on growth and bud break of Rosa hybrida in relation to cytokinin concentrations in xylem sap.

J.A. Dieleman, F.W.A. Verstappen, D. Kuiper

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

The effects of three divergent root temperatures (11°C, 20°C and 26°C) on growth and bud break of Rosa hybrida were studied. Root morphology was changed considerably with root temperature. Roots at 11°C were white, succulent, short and sparsely branched, whereas at 26°C roots were long, brown, thin and branched. However, root dry weight was not affected by root temperature. Axillary bud break was earlier at higher root temperatures, resulting in a higher shoot dry weight. At higher temperatures, bottom breaks tended to appear earlier. Our hypothesis was that the effect of root temperature on growth and bud break of the shoot is mediated by cytokinin production in the roots and/or cytokinin translocation to the shoot. The concentration of zeatin riboside (ZR) in bleeding sap was determined during plant development. ZR was found to decrease slightly after bud break, but was not affected by the root temperature treatments, which falsified our hypothesis. Other processes may be involved in the effect of root temperature on shoot growth and bud break
Original languageEnglish
Pages (from-to)183-192
JournalScientia Horticulturae
Volume76
DOIs
Publication statusPublished - 1998

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