Carbon allocation during defoliation: testing a defense-growth trade-off in balsam fir

被引:51
作者
Deslauriers, Annie [1 ]
Caron, Laurie [1 ]
Rossi, Sergio [1 ]
机构
[1] Univ Quebec Chicoutimi, Dept Sci Fondamentales, Chicoutimi, PQ G7H 2B1, Canada
来源
FRONTIERS IN PLANT SCIENCE | 2015年 / 6卷
基金
加拿大自然科学与工程研究理事会;
关键词
spruce budworm outbreak; terpenoids; carbon allocation; starch; trade-off; wood formation; TEMPERATE FOREST TREES; SPRUCE BUDWORM GROWTH; WHITE-PINE WEEVIL; ABIES-BALSAMEA; SCOTS PINE; NONSTRUCTURAL CARBON; EASTERN CANADA; WOOD FORMATION; MONOTERPENE CONCENTRATIONS; ECOPHYSIOLOGICAL BASIS;
D O I
10.3389/fpls.2015.00338
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
During repetitive defoliation events, carbon can become limiting for trees. To maintain growth and survival, the resources have to be shared more efficiently, which could result in a trade-off between the different physiological processes of a plant. The objective of this study was to assess the effect of defoliation in carbon allocation of balsam fir [Abies balsamea (L.) Mill.] to test the presence of a trade-off between allocation to growth, carbon storage, and defense. Three defoliation intensities [control (C-trees, 0% defoliation), moderately (M-trees, 41-60%), and heavily (H-trees, 61-80%) defoliated] were selected in order to monitor several variables related to stem growth (wood formation in xylem), carbon storage in stem and needle (non-structural soluble sugars and starch), and defense components in needles (terpenoids compound) from May to October 2011. The concentration of starch was drastically reduced in both wood and leaves of H-trees with a quasi-absence of carbon partitioning to storage in early summer. Fewer kinds of monoterpenes and sesquiterpenes were formed with an increasing level of defoliation indicating a lower carbon allocation for the production of defense. The carbon allocation to wood formation gradually reduced at increasing defoliation intensities, with a lower growth rate and fewer tracheids resulting in a reduced carbon sequestration in cell walls. The hypothesis of a trade-off between the allocations to defense components and to non-structural (NCS) and structural (growth) carbon was rejected as most of the measured variables decreased with increasing defoliation. The starch amount was highly indicative of the tree carbon status at different defoliation intensity and future research should focus on the mechanism of starch utilization for survival and growth following an outbreak.
引用
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页码:1 / 13
页数:13
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