Root carbon reserve dynamics in aspen seedlings: does simulated drought induce reserve limitation?

被引:164
作者
Galvez, David A. [1 ]
Landhaeusser, S. M. [1 ]
Tyree, M. T. [1 ,2 ]
机构
[1] Univ Alberta, Fac Agr Life & Environm Sci, Dept Renewable Resources, Edmonton, AB T6G 2E3, Canada
[2] US Forest Serv, No Res Stn, Burlington, VT 05403 USA
基金
加拿大自然科学与工程研究理事会;
关键词
carbon limitation; native percentage loss of conductivity; non-structural carbohydrates; Populus tremuloides; starch; xylem cavitation; INDUCED TREE MORTALITY; STOMATAL CONDUCTANCE; POPULUS-DELTOIDES; PLANT-SURVIVAL; WATER STATUS; MECHANISMS; POPLAR; ASSIMILATION; VARIABILITY; RESPONSES;
D O I
10.1093/treephys/tpr012
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
In a greenhouse study we quantified the gradual change of gas exchange, water relations and root reserves of aspen (Populus tremuloides Michx.) seedlings growing over a 3-month period of severe water stress. The aim of the study was to quantify the complex interrelationship between growth, water and gas exchange, and root carbon (C) dynamics. Various growth, gas exchange and water relations variables in combination with root reserves were measured periodically on seedlings that had been exposed to a continuous drought treatment over a 12-week period and compared with well-watered seedlings. Although gas exchange and water relations parameters significantly decreased over the drought period in aspen seedlings, root reserves did not mirror this trend. During the course of the experiment roots of aspen seedlings growing under severe water stress showed a two orders of magnitude increase in sugar and starch content, and roots of these seedlings contained more starch relative to sugar than those in non-droughted seedlings. Drought resulted in a switch from growth to root reserves storage which indicates a close interrelationship between growth and physiological variables and the accumulation of root carbohydrate reserves. Although a severe 3-month drought period created physiological symptoms of C limitation, there was no indication of a depletion of root C reserve in aspen seedlings.
引用
收藏
页码:250 / 257
页数:8
相关论文
共 48 条
[21]   Interactions between drought and shade on growth and physiological traits in two Populus cathayana populations [J].
Huang, Xiaoxia ;
Yin, Chunying ;
Duan, Baoli ;
Li, Chunyang .
CANADIAN JOURNAL OF FOREST RESEARCH, 2008, 38 (07) :1877-1887
[22]   DROUGHT RESISTANCE IN PLANTS AND PHYSIOLOGICAL PROCESSES [J].
ILJIN, WS .
ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY, 1957, 8 :257-274
[23]  
Lambers H., 2008, Plant physiological ecology, V2, DOI [10.1007/978-0-387-78341-3, DOI 10.1007/978-0-387-78341-3]
[24]   DROUGHT AND SHADE INTERACT TO CAUSE FINE-ROOT MORTALITY IN DOUGLAS-FIR SEEDLINGS [J].
MARSHALL, JD .
PLANT AND SOIL, 1986, 91 (01) :51-60
[25]   Historical and projected climate data for natural resource management in western Canada [J].
Mbogga, Michael S. ;
Hamann, Andreas ;
Wang, Tongli .
AGRICULTURAL AND FOREST METEOROLOGY, 2009, 149 (05) :881-890
[26]   Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought? [J].
McDowell, Nate ;
Pockman, William T. ;
Allen, Craig D. ;
Breshears, David D. ;
Cobb, Neil ;
Kolb, Thomas ;
Plaut, Jennifer ;
Sperry, John ;
West, Adam ;
Williams, David G. ;
Yepez, Enrico A. .
NEW PHYTOLOGIST, 2008, 178 (04) :719-739
[27]   The mechanisms of carbon starvation: how, when, or does it even occur at all? [J].
McDowell, Nate G. ;
Sevanto, Sanna .
NEW PHYTOLOGIST, 2010, 186 (02) :264-266
[28]   Die and let live:: leaf senescence contributes to plant survival under drought stress [J].
Munné-Bosch, S ;
Alegre, L .
FUNCTIONAL PLANT BIOLOGY, 2004, 31 (03) :203-216
[29]  
Pinheiro J., 2022, R. Package Version 3, P1
[30]  
Pournelle G. H., 1953, Journal of Mammalogy, V34, P133, DOI 10.1890/0012-9658(2002)083[1421:SDEOLC]2.0.CO