Carbon allocation during defoliation: testing a defense-growth trade-off in balsam fir.
Carbon allocation during defoliation: testing a defense-growth trade-off in balsam fir.
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脱叶时的碳分配：测试Balsam Fir的防御增长权衡。
DOI：
10.3389/fpls.2015.00338
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发表时间：
2015
影响因子：
5.6
通讯作者：
Rossi S
中科院分区：
文献类型：
--
作者：
Deslauriers A;Caron L;Rossi S
在重复的落叶事件中，碳可能会成为树木的限制。为了维持生长和生存，必须更有效地共享资源，这可能导致植物不同生理过程之间的权衡。本研究的目的是评估落叶对香脂冷杉 [Abies balsamea (L.) Mill.] 碳分配的影响，以测试生长分配、碳储存和防御之间是否存在权衡。选择三种落叶强度[对照（C 树，0% 落叶）、中度（M 树，41–60%）和重度（H 树，61–80%）落叶]，以监测 5 月至 10 月与茎生长（木质部木材形成）、茎和针叶中的碳储存（非结构可溶性糖和淀粉）以及针叶中的防御成分（萜类化合物）相关的几个变量。 2011年。初夏时，H树的木材和叶子中的淀粉浓度急剧降低，几乎没有碳分配到储存。随着落叶程度的增加，形成的单萜和倍半萜烯种类越来越少，这表明用于防御生产的碳分配较低。随着落叶强度的增加，木材形成中的碳分配逐渐减少，生长速度降低，管胞减少，导致细胞壁固碳减少。国防组成部分与非结构性（NCS）和结构性（增长）碳分配之间的权衡假设被拒绝，因为大多数测量变量随着落叶的增加而减少。淀粉含量高度反映了不同落叶强度下树木的碳状况，未来的研究应集中在疫情爆发后利用淀粉维持生存和生长的机制。
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.
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影响因子：
7.4
作者：
GERSHENZON, J;MAFFEI, M;CROTEAU, R
通讯作者：
CROTEAU, R
影响因子：
6.9
作者：
Giovannelli, Alessio;Deslauriers, Annie;Crivellaro, Alan
通讯作者：
Crivellaro, Alan
影响因子：
2.2
作者：
Deslauriers, A;Morin, H;Begin, Y
通讯作者：
Begin, Y
影响因子：
4.2
作者：
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通讯作者：
Hoch, Guenter
影响因子：
4.8
作者：
Carlow, Samantha J.;Ayers, Lauren;Butcher, David J.
通讯作者：
Butcher, David J.