干旱区生态环境知识资源中心(Arid): The Physiological Effect of a Holoparasite Over a Cactus Along an Environmental Gradient

Arid

DOI	10.3389/fpls.2021.763446
	The Physiological Effect of a Holoparasite Over a Cactus Along an Environmental Gradient
	Ossa, Carmen Gloria; Aros-Mualin, Daniela; Mujica, Maria Isabel; Perez, Fernanda
通讯作者	Ossa, CG (corresponding author), Univ Valparaiso, Inst Biol, Fac Ciencias, Valparaiso, Chile. ; Ossa, CG (corresponding author), Univ Valparaiso, Ctr Invest & Gest Recursos Nat, Valparaiso, Chile. ; Aros-Mualin, D (corresponding author), Univ Zurich, Dept Systemat & Evolutionary Bot, Zurich, Switzerland.
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2021
卷号	12
英文摘要	Echinopsis chiloensis is an endemic cactus from Chile, distributed in a temperature and rainfall gradient between 30 degrees and 35 degrees South latitude, with mean temperatures increasing and precipitation decreasing toward the north. It is the main host of the mistletoe Tristerix aphyllus, a holoparasite completely dependent on the cactus for water, carbon, and minerals. In this study, we investigated the consequences of parasitism over the fitness and physiology of this cactus throughout its distribution range and how it is affected by the environment. We measured five functional traits in eight populations latitudinally distributed, the first three only for the host: reproductive fitness, stomatal traits (density and size), and photosynthesis (during winter and summer); and the last two for the host and parasite: stable isotopes ( partial differential C-13 and partial differential N-15), and nutrients (carbon and nitrogen content). The results showed a negative effect of parasitism over fitness of infected cacti. However, the higher nitrogen concentrations in cactus tissues toward the south improved overall fitness. Regarding photosynthesis, we only observed a negative effect of parasitism during the dry season (summer), which is also negatively affected by the increase in summer temperatures and decrease in winter rainfall toward the north. There were no differences in nutrient concentration or in the isotopic signature of healthy and infected cacti. Conversely, we observed a higher carbon and lower nitrogen concentration in mistletoes than in cacti regardless of latitude. The loss of temperature seasonality toward the north increases the C:N ratio, and the values between the parasite and its host diverge. partial differential N-15 was similar between parasites and hosts while partial differential C-13 of the parasite was enriched when compared to its host. Overall, the infection by T. aphyllus affects Echinopsis chiloensis fitness but showed no strong effects over the cactus physiology, except for the summer photosynthesis. Therefore, our data revealed that E. chiloensis response to T. aphyllus infection is sensitive to environmental changes in a way that could be strongly impacted by the desertification projected for this area due to climate change.
英文关键词	cactus holoparasite functional traits isotope ecology environmental gradient CAM plant-plant interaction mistletoe
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000726157200001
WOS关键词	TRISTERIX-APHYLLUS LORANTHACEAE ; SINK-STIMULATED PHOTOSYNTHESIS ; CARBON-ISOTOPE COMPOSITION ; NITRATE UPTAKE NITROGEN ; STRIGA-HERMONTHICA ; PARASITIC PLANTS ; CUSCUTA-CAMPESTRIS ; VEGETATIVE GROWTH ; MIKANIA-MICRANTHA ; HOST
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373867
作者单位	[Ossa, Carmen Gloria] Univ Valparaiso, Inst Biol, Fac Ciencias, Valparaiso, Chile; [Ossa, Carmen Gloria] Univ Valparaiso, Ctr Invest & Gest Recursos Nat, Valparaiso, Chile; [Aros-Mualin, Daniela] Univ Zurich, Dept Systemat & Evolutionary Bot, Zurich, Switzerland; [Mujica, Maria Isabel; Perez, Fernanda] Inst Ecol & Biodiversidad, Santiago, Chile; [Mujica, Maria Isabel; Perez, Fernanda] Pontificia Univ Catolica Chile, Fac Ciencias Biol, Dept Ecol, Santiago, Chile
推荐引用方式 GB/T 7714	Ossa, Carmen Gloria,Aros-Mualin, Daniela,Mujica, Maria Isabel,et al. The Physiological Effect of a Holoparasite Over a Cactus Along an Environmental Gradient[J],2021,12.
APA	Ossa, Carmen Gloria,Aros-Mualin, Daniela,Mujica, Maria Isabel,&Perez, Fernanda.(2021).The Physiological Effect of a Holoparasite Over a Cactus Along an Environmental Gradient.FRONTIERS IN PLANT SCIENCE,12.
MLA	Ossa, Carmen Gloria,et al."The Physiological Effect of a Holoparasite Over a Cactus Along an Environmental Gradient".FRONTIERS IN PLANT SCIENCE 12(2021).