干旱区生态环境知识资源中心(Arid): Divergence of Desiccation-Related Traits inSitobion avenaefrom Northwestern China

Arid

DOI	10.3390/insects11090626
	Divergence of Desiccation-Related Traits inSitobion avenaefrom Northwestern China
	Yang, Yujing; Liu, Deguang; Liu, Xiaoming; Wang, Biyao; Shi, Xiaoqin
通讯作者	Liu, DG
来源期刊	INSECTS
EISSN	2075-4450
出版年	2020
卷号	11 期号:9
英文摘要	Simple Summary Increasing frequency and intensity of drought has been causing increasing vulnerability for many ecosystems around the globe; thus, it is critical to understand how insects evolve in changing environments. We collected and genotyped samples of the wheat aphidSitobion avenaefrom arid areas of northwestern China, and then examined their desiccation-related traits. We found both desiccation-resistant and -nonresistant genotypes, providing clear evidence of genetic divergence in desiccation resistance of this aphid. Wingless individuals tended to have higher desiccation resistance than winged ones. Extensive analyses of desiccation-related traits showed that modulation of water loss rates could be the primary mechanism underlying aphids' resistance against desiccation stress. The content of cuticular hydrocarbons (especially methyl-branched alkanes) and their high plasticity could be closely linked to water loss rates in aphids, thereby modulating their desiccation resistance. This study can provide insights into how insects adapt to desiccating environments, and has particular relevance to the prediction of insect pest outbreaks under future warming scenarios. The impact of drought on insects has become increasingly evident in the context of global climate change, but the physiological mechanisms of aphids' responses to desiccating environments are still not well understood. We sampled the wheat aphidSitobion avenae(Fabricius) (Hemiptera: Aphididae) from arid areas of northwestern China. Both desiccation-resistant and -nonresistant genotypes were identified, providing direct evidence of genetic divergence in desiccation resistance ofS. avenae. Resistant genotypes of winglessS. avenaeshowed longer survival time and LT50 under the desiccation stress (i.e., 10% relative humidity) than nonresistant genotypes, and wingless individuals tended to have higher desiccation resistance than winged ones. Both absolute and relative water contents did not differ between the two kinds of genotypes. Resistant genotypes had lower water loss rates than nonresistant genotypes for both winged and wingless individuals, suggesting that modulation of water loss rates could be the primary strategy in resistance of this aphid against desiccation stress. Contents of cuticular hydrocarbons (CHC) (especially methyl-branched alkanes) showed significant increase for both resistant and nonresistant genotypes after exposure to the desiccation stress for 24 h. Under desiccation stress, survival time was positively correlated with contents of methyl-branched alkanes for resistant genotypes. Thus, the content of methyl-branched alkanes and their high plasticity could be closely linked to water loss rate and desiccation resistance inS. avenae. Our results provide insights into fundamental aspects and underlying mechanisms of desiccation resistance in aphids, and have significant implications for the evolution of aphid populations in the context of global warming.
英文关键词	wheat aphids desiccation resistance population divergence water balance traits adaptive response cuticular hydrocarbons
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:000580220900001
WOS关键词	SEX-SPECIFIC DIVERGENCE ; WATER-LOSS ; GAS-EXCHANGE ; BODY-SIZE ; PEA APHID ; DIFFERENTIAL PERFORMANCE ; CUTICULAR HYDROCARBONS ; ACYRTHOSIPHON-PISUM ; RHOPALOSIPHUM-PADI ; DROUGHT-STRESS
WOS类目	Entomology
WOS研究方向	Entomology
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326943
作者单位	[Yang, Yujing; Liu, Deguang; Liu, Xiaoming; Wang, Biyao; Shi, Xiaoqin] Northwest A&F Univ, State Key Lab Crop Stress Biol Arid Areas, Yangling 712100, Shaanxi, Peoples R China; [Yang, Yujing; Liu, Deguang; Liu, Xiaoming; Wang, Biyao; Shi, Xiaoqin] Northwest A&F Univ, Coll Plant Protect, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yujing,Liu, Deguang,Liu, Xiaoming,et al. Divergence of Desiccation-Related Traits inSitobion avenaefrom Northwestern China[J]. 西北农林科技大学,2020,11(9).
APA	Yang, Yujing,Liu, Deguang,Liu, Xiaoming,Wang, Biyao,&Shi, Xiaoqin.(2020).Divergence of Desiccation-Related Traits inSitobion avenaefrom Northwestern China.INSECTS,11(9).
MLA	Yang, Yujing,et al."Divergence of Desiccation-Related Traits inSitobion avenaefrom Northwestern China".INSECTS 11.9(2020).