Planta (2017) 246:495–508 DOI 10.1007/s00425-017-2707-7 ORIGINAL ARTICLE Spring bud growth depends on sugar delivery by xylem and water recirculation by phloem Mu ¨ nch ﬂow in Juglans regia 1 2 1 1 • • • • Aude Tixier Or Sperling Jessica Orozco Bruce Lampinen 3 4 5 1 • • • Adele Amico Roxas Sebastian Saa J. Mason Earles Maciej A. Zwieniecki Received: 7 February 2017 / Accepted: 29 April 2017 / Published online: 9 May 2017 Springer-Verlag Berlin Heidelberg 2017 Abstract notion of long-distance translocation. Girdling and dye Main conclusion During spring, bud growth relies on perfusion experiments were performed to assess the role of long-distance transport of remotely stored carbohy- phloem and xylem in the transport of carbohydrate and drates. A new hypothesis suggests this transport is water towards the buds. Girdling caused a decrease in non- achieved by the interplay of xylem and phloem. structural carbohydrate concentration above the point of girdling and an unexpected concurrent increase in water During the spring, carbohydrate demand of developing content associated with impeded xylem transport. Based on buds often exceeds locally available storage, thus requiring experimental observations and modeling, we propose a the translocation of sugars from distant locations
Planta – Springer Journals
Published: May 9, 2017
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