气候变化领域集成服务门户(CCPortal): Linking carbon supply to root cell-wall chemistry and mechanics at high altitudes in Abies georgei

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DOI	10.1093/aob/mcq237
	Linking carbon supply to root cell-wall chemistry and mechanics at high altitudes in Abies georgei
	Genet, Marie; Li, Mingcai; Luo, Tianxiang; Fourcaud, Thierry; Clement-Vidal, Anne; Stokes, Alexia
通讯作者	Genet, M (通讯作者)
发表日期	2011
ISSN	0305-7364
EISSN	1095-8290
起始页码	311
结束页码	320
卷号	107 期号:2
英文摘要	Background and Aims The mobile carbon supply to different compartments of a tree is affected by climate, but its impact on cell-wall chemistry and mechanics remains unknown. To understand better the variability in root growth and biomechanics in mountain forests subjected to substrate mass movement, we investigated root chemical and mechanical properties of mature Abies georgei var. smithii (Smith fir) growing at different elevations on the Tibet-Qinghai Plateau. Methods Thin and fine roots (0.1-4.0 mm in diameter) were sampled at three different elevations (3480, 3900 and 4330 m, the last corresponding to the treeline). Tensile resistance of roots of different diameter classes was measured along with holocellulose and non-structural carbon (NSC) content. Key Results The mean force necessary to break roots in tension decreased significantly with increasing altitude and was attributed to a decrease in holocellulose content. Holocellulose was significantly lower in roots at the treeline (29.5 +/- 1.3 %) compared with those at 3480 m (39.1 +/- 1.0 %). Roots also differed significantly in NSC, with 35.6 +/- 4.1 mg g(-1) dry mass of mean total soluble sugars in roots at 3480 m and 18.8 +/- 2.1 mg g(-1) dry mass in roots at the treeline. Conclusions Root mechanical resistance, holocellulose and NSC content all decreased with increasing altitude. Holocellulose is made up principally of cellulose, the biosynthesis of which depends largely on NSC supply. Plants synthesize cellulose when conditions are optimal and NSC is not limiting. Thus, cellulose synthesis in the thin and fine roots measured in our study is probably not a priority in mature trees growing at very high altitudes, where climatic factors will be limiting for growth. Root NSC stocks at the treeline may be depleted through over-demand for carbon supply due to increased fine root production or winter root growth.
关键词	GROWTH-LIMITATION TENSILE-STRENGTH SLOPE STABILITY TREE ROOTS REINFORCEMENT CELLULOSE TEMPERATURES FOREST ARCHITECTURE PLANTATIONS
英文关键词	Abies georgei; biomechanics; tensile resistance; cellulose content; non-structural carbon; root strength; Tibet-Qinghai; slope stability
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000286672500012
来源期刊	ANNALS OF BOTANY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257955
推荐引用方式 GB/T 7714	Genet, Marie,Li, Mingcai,Luo, Tianxiang,et al. Linking carbon supply to root cell-wall chemistry and mechanics at high altitudes in Abies georgei[J]. 中国科学院青藏高原研究所,2011,107(2).
APA	Genet, Marie,Li, Mingcai,Luo, Tianxiang,Fourcaud, Thierry,Clement-Vidal, Anne,&Stokes, Alexia.(2011).Linking carbon supply to root cell-wall chemistry and mechanics at high altitudes in Abies georgei.ANNALS OF BOTANY,107(2).
MLA	Genet, Marie,et al."Linking carbon supply to root cell-wall chemistry and mechanics at high altitudes in Abies georgei".ANNALS OF BOTANY 107.2(2011).