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; Brossa, Ricard; Gil Sanchez, Luis Alfonso y 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.

Descripción

Título: 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.
Autor/es:
  • López Rodríguez, Rosa Ana
  • Brossa, Ricard
  • Gil Sanchez, Luis Alfonso
  • Pita Andreu, Pilar
Tipo de Documento: Artículo
Título de Revista/Publicación: Frontiers in Plant Science
Fecha: Abril 2015
Volumen: 6
Materias:
Palabras Clave Informales: Sprouting, Source–sink regulation, Gas exchange, Chlorophyll fluorescence, Hydraulic conductance, ABA
Escuela: E.T.S.I. Montes (UPM) [antigua denominación]
Departamento: Sistemas y Recursos Naturales
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 44760
Identificador DC: http://oa.upm.es/44760/
Identificador OAI: oai:oa.upm.es:44760
Identificador DOI: 10.3389/fpls.2015.00285
Depositado por: Memoria Investigacion
Depositado el: 13 Mar 2017 14:00
Ultima Modificación: 19 Abr 2017 09:15
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