Allocation of 14C assimilated in late spring to tissue and biochemical stem components of cork oak (Quercus suber L.) over the seasons

Aguado Cortijo, Pedro Luis and Curt Fernández de la Mora, Mª Dolores and Pereira, Elena and Fernandez Gonzalez, Jesus (2012). Allocation of 14C assimilated in late spring to tissue and biochemical stem components of cork oak (Quercus suber L.) over the seasons. "Tree Physiology", v. 3 (n. 32); pp. 313-325. ISSN 0829-318X.

Description

Title: Allocation of 14C assimilated in late spring to tissue and biochemical stem components of cork oak (Quercus suber L.) over the seasons
Author/s:
  • Aguado Cortijo, Pedro Luis
  • Curt Fernández de la Mora, Mª Dolores
  • Pereira, Elena
  • Fernandez Gonzalez, Jesus
Item Type: Article
Título de Revista/Publicación: Tree Physiology
Date: March 2012
ISSN: 0829-318X
Volume: 3
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Producción Vegetal: Botánica y Protección Vegetal [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Carbon distribution in the stem of 2-year-old cork oak plants was studied by 14CO2 pulse labeling in late spring in order to trace the allocation of photoassimilates to tissue and biochemical stem components of cork oak. The fate of 14C photoassimilated carbon was followed during two periods: the first 72 h (short-term study) and the first 52 weeks (long-term study) after the 14CO2 photosynthetic assimilation. The results showed that 14C allocation to stem tissues was dependent on the time passed since photoassimilation and on the season of the year. In the first 3 h all 14C was found in the polar extractives. After 3 h, it started to be allocated to other stem fractions. In 1 day, 14C was allocated mostly to vascular cambium and, to a lesser extent, to primary phloem; no presence of 14C was recorded for the periderm. However, translocation of 14C to phellem was observed from 1 week after 14CO2 pulse labeling. The phellogen was not completely active in its entire circumference at labeling, unlike the vascular cambium; this was the tissue that accumulated most photoassimilated 14C at the earliest sampling. The fraction of leaf-assimilated 14C that was used by the stem peaked at 57% 1 week after 14CO2 plant exposure. The time lag between C photoassimilation and suberin accumulation was ∼8 h, but the most active period for suberin accumulation was between 3 and 7 days. Suberin, which represented only 1.77% of the stem weight, acted as a highly effective sink for the carbon photoassimilated in late spring since suberin specific radioactivity was much higher than for any other stem component as early as only 1 week after 14C plant labeling. This trend was maintained throughout the whole experiment. The examination of microautoradiographs taken over 1 year provided a new method for quantifying xylem growth. Using this approach it was found that there was more secondary xylem growth in late spring than in other times of the year, because the calculated average cell division time was much shorter.

More information

Item ID: 15662
DC Identifier: http://oa.upm.es/15662/
OAI Identifier: oai:oa.upm.es:15662
Official URL: http://treephys.oxfordjournals.org/content/32/3/313.abstract
Deposited by: Memoria Investigacion
Deposited on: 13 Jun 2013 12:31
Last Modified: 21 Apr 2016 15:55
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