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Journal of Integrative Agriculture 2023年第3期22卷 812-824页

作者： JIN Ji-su LIU Yi-ran ZHOU Zhong-shi WAN Fang-hao GUO Jian-ying State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China Agricultural Genomics Institute at Shenzhen Chinese Academy of Agricultural SciencesShenzhen 518120P.R.China

In insects,ecdysteroids are synthesized by genes of the Halloween family and play important roles in several key developmental events,including molting and ***,the roles of these genes in agasicles hygrophila are still largely *** this study,the expression patterns of the two Halloween genes AhCYP307A2 and AhCYP314A1 were determined by quantitative PCR(qPCR)at different developmental ***,the functions of these two genes were explored using RNA interference(RNAi),and ovarian development was observed by dissecting the ovaries of *** *** qPCR results showed that AhCYP307A2 and AhCYP314A1 were highly expressed in last instar larvae and in adult *** addition,AhCYP307A2 was also highly expressed in eggs and pupae but was markedly lower than in third-instar larvae and *** RNAi results showed that the injection of dsAhCYP307A2 or dsAhCYP314A1 markedly inhibited their expression and the transcription levels of three related *** of AhCYP307A2 or AhCYP314A1 significantly inhibited larval molting,impaired last instar larva–pupa–adult transition,delayed ovarian development,and stopped egg production(i.e.,no eggs were laid).These results indicate that AhCYP307A2 and AhCYP314A1 play important regulatory roles in last instar larva–pupa–adult transition and reproduction in ***.

关键词： agasicles hygrophila ovary oogenesis AhCYP307A2 AhCYP314A1 RNA interference

Sequential loss of genetic variation in flea beetle agasicles hygrophila （Coleoptera： Chrysomelidae） following introduction into China

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Insect Science 2013年第5期20卷 655-661页

作者： Rui-Yan Ma Xiao-Yun Jia Wen-Zhong Liu Roger H. Laushman Long-Long Zhao Dong Jia Ren Wang Department of Biosafety College of Animal Science and Technology Shanxi Agricultural University Taigu Shanxi China Department of Biology Oberlin College Oberlin Ohio USA and Chinese Academy of Agricultural Science Beijing China

The flea beetle （agasicles hygrophila） was imported to Florida, USA and then introduced from Florida into China in 1987 as a biological control agent for the invasive plant alligator weed （Alternanthera philoxeroides）. The initial beetle population was subsequently used for sequential introductions in other areas of China, but little is known about the genetic consequences of the introductions. In this study, the genetic diversity and population structure of five beetle populations, the source Florida population, three intentionally introduced China populations and one accidentally dispersed China population, were examined using amplified fragment length polymorphisms. The results showed a clear pattern of decreasing genetic diversity with the sequential introductions. The diversity was highest in the Florida population followed by the first introduction to Chongqing and then in Kunming and Fuzhou. The lowest diversity was found in the accidentally dispersed Guangzhou population that was first recorded in 1996. Both loci parameters and Nei＇s genetic diversity showed a high variation among these populations. Genetic differentiation among populations was further verified by the GST statistic （0.136–0.432）. Beetles in Kunming had the highest gene flow with those in Guangzhou, and therefore lowest differentiation and closest genetic distance. These data show that sequential introduction influenced the genetic diversity of populations in China. Genetic diversity should be considered in planning introduction and long-term maintenance of populations.

关键词： AFLP agasicles hygrophila biological control genetic diversity introduction

Effects of physiological integration on defense strategies against herbivory by the clonal plant Alternanthera philoxeroides

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Journal of Plant Ecology 2019年第4期12卷 662-672页

作者： Rubén Portela Bi-Cheng Dong Fei-Hai Yu Rodolfo Barreiro Sergio R.Roiloa BioCost Group Biology DepartmentUniversidade da CoruñaA Coruña 15071Spain School of Nature Conservation Beijing Forestry UniversityBeijing 100083China Institute of Wetland Ecology&Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation Taizhou UniversityTaizhou 318000China

Aims The plant-herbivore interaction is one of the most fundamental inter-actions in *** are sessile organisms,and consequently rely on particular strategies to avoid or reduce the negative impact of ***,we aimed to determine the defense strategies against insect herbivores in the creeping invasive plant Alternanthera *** We tested the defense response of *** to herbivory by a leaf-feeding specialist insect agasicles hygrophila and a pol-yphagous sap-feeding insect Planococcus *** also tested the mechanisms triggering defense responses of *** by including treatments of artificial leaf removal and jasmonic acid ***,we examined the effect of physiological integration on these defense *** Findings The combination of artificial leaf removal and jasmonic acid appli-cation produced a similar effect to that of leaf-feeding by the real *** integration influenced the defense strat-egies of *** against herbivores,and increased biomass allocation to aboveground parts in its apical ramets damaged by real *** study highlights the importance of physio-logical integration and modular plasticity for understanding the consequences of herbivory in clonal plants.

关键词： agasicles hygrophila alligator weed clonal integration herbivory Planococcus minor

Effects of clonal integration and nitrogen supply on responses of a clonal plant to short-term herbivory

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Journal of Plant Ecology 2019年第4期12卷 624-635页

作者： Bi-Cheng Dong Li-Min Zhang Kai-Yu Li Xiao-Ting Hu Pu Wang Yong-Jian Wang Fang-Li Luo Hong-Li Li Fei-Hai Yu School of Nature Conservation Beijing Forestry UniversityBeijing 100083China Institute of Botany Chinese Academy of SciencesBeijing 100093China College of Horticulture and Forestry Sciences Huazhong Agricultural UniversityWuhan 430070China Institute of Wetland Ecology&Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation Taizhou UniversityTaizhou 318000China

Aims Clonal integration,*** sharing between interconnected ramets,can help clonal plants tolerate abiotic ***,few studies have directly examined the ecological significance of clonal integration in the ability of clonal plants to tolerate biotic stress such as *** We grew clonal fragments of an invasive clonal plant Alternanthera philoxeroides,each consisting of an apical part(relatively young)and a basal part(relatively old),at two levels(low and high)of soil nitrogen(N).For each fragment,the apical part was subjected to either no herbivory or herbivory for 2 weeks by a specialist insect,agasicles hygrophila,and was either connected with or discon-nected from the basal part not subjected to *** Findings Herbivory in the apical part severely reduced leaf growth(leaf mass,leaf number or leaf area)and ramet production of both apical and basal parts,and increased root to shoot ratio of the apical *** of herbivory and soil N,stem connection between the apical and the basal part decreased root to shoot ratio of the ap-ical part,but did not change its growth ***,con-nection increased stem N concentration of the apical part growing under high-N supply and decreased stem carbon(C)concentration of the apical part under low-N *** contrast,connection in-creased root to shoot ratio of the basal part,but reduced its leaf and ramet *** also increased leaf and stem C concentrations of the basal part under low-N ***,clonal integration can be beneficial for the early development of young *** ramets,but not for their local adaptation to herbivory damage by ***.

关键词： agasicles hygrophila Alternanthera philoxeroides foliar herbivory invasive species physiological integration

Effects of soil nitrogen levels on growth and defense of the native and introduced genotypes of alligator weed

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Journal of Plant Ecology 2022年第3期15卷 461-472页

作者： Mu Liu Fang Zhou Xiaoyun Pan Zhijie Zhang Bo Li Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering National Observations and Research Station for Wetland Ecosystems of the Yangtze EstuaryInstitute of Biodiversity ScienceSchool of Life SciencesFudan UniversityShanghai 200438China Research Center for Ecology College of ScienceTibet UniversityLhasa 850000China Tibet University—Fudan University Joint Laboratory for Biodiversity and Global Change Fudan UniversityShanghai 200032China Ecology Department of BiologyUniversity of Konstanz78464 KonstanzGermany

Plants growing in nutrient-rich environment are predicted to be less defended than conspecifics under nutrient ***,less is known about the effects of nutrient levels on tolerance and induced resistance,and whether the effects differ between native and introduced populations of invasive *** performed a greenhouse experiment with introduced(the USA)and native(Argentina)genotypes of Alternanthera philoxeroides in order to study the effects of soil nitrogen levels on plant growth,constitutive and herbivore(agasicles hygrophila)-induced chemical defense,and herbivory *** measured total biomass,elongation rate(as proxy of growth rate),carbon and nitrogen,and the concentration of triterpenoid saponins(defensive chemicals)in leaves and *** resistance(+33%higher leaf triterpenoid saponins in control treatment at low nitrogen level)and tolerance[less decreased total biomass after herbivory treatment(−24%and−15%for high and low nitrogen levels)]were favored at lower nitrogen level,while induced resistance was favored at higher nitrogen level(+24%increased leaf triterpenoid saponins after herbivory treatment at high nitrogen level).Constitutive resistance and tolerance exhibited trade-offs with growth rate,while induced resistance positively correlated with growth ***,the introduced genotypes had−6%lower content of leaf carbon in the presence of herbivores than the native genotypes at low nitrogen level,but such difference was absent at high nitrogen *** results indicate that soil nitrogen levels influence the preference of different defensive strategies of plant,and interweave with herbivory to determine the performance of introduced genotypes.

关键词： Alternanthera philoxeroides agasicles hygrophila growth–differentiation balance hypothesis phenotypic plasticity plant–herbivore interactions plant invasion