Memorias de investigación
Artículos en revistas:
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.
Año:2015
Áreas de investigación
  • Fisiología vegetal
Datos
Descripción
he 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.
Internacional
Si
JCR del ISI
Si
Título de la revista
Frontiers in Plant Science
ISSN
1664-462X
Factor de impacto JCR
3,948
Información de impacto
JCR 2014
Volumen
6
DOI
doi: 10.3389/fpls.2015.00285
Número de revista
285
Desde la página
1
Hasta la página
13
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  • Creador: Departamento: Sistemas y Recursos Naturales