Warming and elevated CO2 affect the relationship between seed mass, germinability and seedling growth in Austrodanthonia caespitosa, a dominant Australian grass

被引:66
作者
Hovenden, Mark J. [1 ]
Wills, Karen E. [1 ]
Chaplin, Rebecca E. [2 ]
Schoor, Jacqueline K. Vander [1 ]
Williams, Amity L. [1 ]
Osanai, Yui [1 ]
Newton, Paul C. D. [3 ]
机构
[1] Univ Tasmania, Sch Plant Sci, Hobart, Tas, Australia
[2] Stanford Univ, Sch Earth Sci, Stanford, CA 94305 USA
[3] AgRes, Land & Environm Management, Palmerston North, New Zealand
关键词
elevated CO(2); FACE; germination; global warming; grassland; seed;
D O I
10.1111/j.1365-2486.2008.01597.x
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
While the influence of elevated CO(2) on the production, mass and quality of plant seeds has been well studied, the effect of warming on these characters is largely unknown; and there is practically no information on possible interactions between warming and elevated CO(2), despite the importance of these characters in population maintenance and recovery. Here, we present the impacts of elevated CO(2) and warming, both in isolation and combination, on seed production, mass, quality, germination success and subsequent seedling growth of Austrodanthonia caespitosa, a dominant temperate C(3) grass from Australia, using seeds collected from the TasFACE experiment. Mean seed production and mass were not significantly affected by either elevated CO(2) or warming, but elevated CO(2) more than doubled the proportion of very light, inviable seeds (P < 0.05) and halved mean seed N concentration (P < 0.04) and N content (P < 0.03). The dependence of seed germination success on seed mass was affected by an elevated CO(2) x warming interaction (P < 0.004), such that maternal exposure to elevated CO(2) or warming reduced germination if applied in isolation, but not when applied in combination. Maternal effects were retained when seedlings were grown in a common environment for 6 weeks, with seedlings descended from warmed plants 20% smaller (P < 0.008) with a higher root : shoot ratio (P < 0.001) than those from unwarmed plants. Given that both elevated CO(2) and warming reduced seed mass, quality, germinability or seedling growth, it is likely that global change will reduce population growth or distribution of this dominant species.
引用
收藏
页码:1633 / 1641
页数:9
相关论文
共 40 条
[21]  
Linder H.P., 2005, FLORA AUSTR B, V44B, P45
[22]   Effects of grazing and management on herbage mass, persistence, animal production and soil water content of native pastures. 1. A redgrass-wallaby grass pasture, Barraba, North West Slopes, New South Wales [J].
Lodge, GM ;
Murphy, SR ;
Harden, S .
AUSTRALIAN JOURNAL OF EXPERIMENTAL AGRICULTURE, 2003, 43 (7-8) :875-890
[23]   Using population viability analysis to predict the effects of climate change on the extinction risk of an endangered limestone endemic shrub, Arizona cliffrose [J].
Maschinski, J ;
Baggs, JE ;
Quintana-Ascencio, PE ;
Menges, ES .
CONSERVATION BIOLOGY, 2006, 20 (01) :218-228
[24]   EFFECTS OF TEMPERATURE ON SEED PRODUCTION, SEED QUALITY AND GROWTH OF PASPALUM-DILATATUM [J].
PEARSON, CJ ;
SHAH, SG .
JOURNAL OF APPLIED ECOLOGY, 1981, 18 (03) :897-905
[25]   Nonintrusive field experiments show different plant responses to warming and drought among sites, seasons, and species in a north-south European gradient [J].
Peñuelas, J ;
Gordon, C ;
Llorens, L ;
Nielsen, T ;
Tietema, A ;
Beier, C ;
Bruna, P ;
Emmett, B ;
Estiarte, M ;
Gorissen, A .
ECOSYSTEMS, 2004, 7 (06) :598-612
[26]  
Price MV, 1998, ECOLOGY, V79, P1261, DOI 10.1890/0012-9658(1998)079[1261:EOEWOP]2.0.CO
[27]  
2
[28]  
Queen JP., 2002, EXPT DESIGN DATA ANA, DOI 10.1017/CBO9780511806384
[29]   In situ effects of elevated CO2 on the carbon and nitrogen status of alpine plants [J].
Schappi, B ;
Korner, C .
FUNCTIONAL ECOLOGY, 1997, 11 (03) :290-299
[30]   EVALUATING APPROACHES TO THE CONSERVATION OF RARE AND ENDANGERED PLANTS [J].
SCHEMSKE, DW ;
HUSBAND, BC ;
RUCKELSHAUS, MH ;
GOODWILLIE, C ;
PARKER, IM ;
BISHOP, JG .
ECOLOGY, 1994, 75 (03) :584-606