Stem girdling evidences a trade-off between cambial activity and sprouting and dramatically reduces plant transpiration due to feedback inhibition of photosynthesis and hormone signaling

López Rodríguez, Rosa Ana and Brossa, Ricard and Gil Sanchez, Luis Alfonso and Pita Andreu, Pilar (2015). Stem girdling evidences a trade-off between cambial activity and sprouting and dramatically reduces plant transpiration due to feedback inhibition of photosynthesis and hormone signaling. "Frontiers in Plant Science", v. 6 (n. 285); pp. 1-13. ISSN 1664-462X. https://doi.org/10.3389/fpls.2015.00285.

Description

Title: Stem girdling evidences a trade-off between cambial activity and sprouting and dramatically reduces plant transpiration due to feedback inhibition of photosynthesis and hormone signaling
Author/s:
  • López Rodríguez, Rosa Ana
  • Brossa, Ricard
  • Gil Sanchez, Luis Alfonso
  • Pita Andreu, Pilar
Item Type: Article
Título de Revista/Publicación: Frontiers in Plant Science
Date: April 2015
ISSN: 1664-462X
Volume: 6
Subjects:
Freetext Keywords: Sprouting, Source–sink regulation, Gas exchange, Chlorophyll fluorescence, Hydraulic conductance, ABA
Faculty: E.T.S.I. Montes (UPM)
Department: Sistemas y Recursos Naturales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The photosynthesis source-sink relationship in young Pinus canariensis seedlings was modified by stem girdling to investigate sprouting and cambial activity, feedback inhibition of photosynthesis, and stem and root hydraulic capacity. Removal of bark tissue showed a trade-off between sprouting and diameter growth. Above the girdle, growth was accelerated but the number of sprouts was almost negligible, whereas below the girdle the response was reversed. Girdling resulted in a sharp decrease in whole plant transpiration and root hydraulic conductance. The reduction of leaf area after girdling was strengthened by the high levels of abscisic acid found in buds which pointed to stronger bud dormancy, preventing a new needle flush. Accumulation of sugars in leaves led to a coordinated reduction in net photosynthesis (AN) and stomatal conductance (gS) in the short term, but later (gS below 0.07 mol m(-2) s(-1)) AN decreased faster. The decrease in maximal efficiency of photosystem II (FV/FM) and the operating quantum efficiency of photosystem II (?PSII) in girdled plants could suggest photoprotection of leaves, as shown by the vigorous recovery of AN and ?PSII after reconnection of the phloem. Stem girdling did not affect xylem embolism but increased stem hydraulic conductance above the girdle. This study shows that stem girdling affects not only the carbon balance, but also the water status of the plant.

More information

Item ID: 44760
DC Identifier: http://oa.upm.es/44760/
OAI Identifier: oai:oa.upm.es:44760
DOI: 10.3389/fpls.2015.00285
Official URL: https://www.frontiersin.org/articles/10.3389/fpls.2015.00285/full
Deposited by: Memoria Investigacion
Deposited on: 13 Mar 2017 14:00
Last Modified: 10 Jun 2019 13:51
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