Artificial asymmetric warming reduces nectar yield in a Tibetan alpine species of Asteraceae

	Artificial asymmetric warming reduces nectar yield in a Tibetan alpine species of Asteraceae
	Mu, Junpeng; Peng, Youhong; Xi, Xinqiang; Wu, Xinwei; Li, Guoyong; Niklas, Karl J.; Sun, Shucun
刊名	ANNALS OF BOTANY
	2015
卷号	116 期号:6 页码:899-906
关键词	POLLINATOR VISITATION CLIMATE-CHANGE HEIGHT-GROWTH PLANT-DENSITY WATER-STRESS TEMPERATURE FLOWER WINTER PATTERNS VERNALIZATION
通讯作者	Sun, SC (reprint author), Nanjing Univ, Dept Biol, Nanjing 210093, Jiangsu, Peoples R China.
产权排序	3
合作状况	国际
英文摘要	Background and Aims Asymmetric warming is one of the distinguishing features of global climate change, in which winter and night-time temperatures are predicted to increase more than summer and diurnal temperatures. Winter warming weakens vernalization and hence decreases the potential to flower for some perennial herbs, and night warming can reduce carbohydrate concentrations in storage organs. This study therefore hypothesized that asymmetric warming should act to reduce flower number and nectar production per flower in a perennial herb, Saussurea nigrescens, a key nectar plant for pollinators in Tibetan alpine meadows. Methods A long-term (6 years) warming experiment was conducted using open-top chambers placed in a natural meadow and manipulated to achieve asymmetric increases in temperature, as follows: a mean annual increase of 0 center dot 7 and 2 center dot 7 A degrees C during the growing and non-growing seasons, respectively, combined with an increase of 1 center dot 6 and 2 center dot 8 A degrees C in the daytime and night-time, respectively, from June to August. Measurements were taken of nectar volume and concentration (sucrose content), and also of leaf non-structural carbohydrate content and plant morphology. Key Results Six years of experimental warming resulted in reductions in nectar volume per floret (64 center dot 7 % of control), floret number per capitulum (8 center dot 7 %) and capitulum number per plant (32 center dot 5 %), whereas nectar concentration remained unchanged. Depletion of leaf non-structural carbohydrates was significantly higher in the warmed than in the ambient condition. Overall plant density was also reduced by warming, which, when combined with reductions in flower development and nectar volumes, led to a reduction of similar to 90 % in nectar production per unit area. Conclusions The negative effect of asymmetric warming on nectar yields in S. nigrescens may be explained by a concomitant depletion of leaf non-structural carbohydrates. The results thus highlight a novel aspect of how climate change might affect plant-pollinator interactions and plant reproduction via induction of allocation shifts for plants growing in communities subject to asymmetric warming.
学科主题	Plant Sciences
类目[WOS]	Plant Sciences
语种	英语
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/27488]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Mu, Junpeng,Peng, Youhong,Xi, Xinqiang,et al. Artificial asymmetric warming reduces nectar yield in a Tibetan alpine species of Asteraceae[J]. ANNALS OF BOTANY,2015,116(6):899-906.
APA	Mu, Junpeng.,Peng, Youhong.,Xi, Xinqiang.,Wu, Xinwei.,Li, Guoyong.,...&Sun, Shucun.(2015).Artificial asymmetric warming reduces nectar yield in a Tibetan alpine species of Asteraceae.ANNALS OF BOTANY,116(6),899-906.
MLA	Mu, Junpeng,et al."Artificial asymmetric warming reduces nectar yield in a Tibetan alpine species of Asteraceae".ANNALS OF BOTANY 116.6(2015):899-906.