| 泽兰实蝇寄生对紫茎泽兰生长和防御能力的影响 |
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| 引用本文：姜丽娜,木霖,孙昂,岳英,刘梦然,桂富荣.泽兰实蝇寄生对紫茎泽兰生长和防御能力的影响.植物保护学报,2019,46(1):56-62 |
| DOI：10.13802/j.cnki.zwbhxb.2019.2019907 |
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| 中文摘要:为明确泽兰实蝇Procecidochares utilis寄生对紫茎泽兰Ageratina adenophora生长及防御能力的影响，在温室内设置泽兰实蝇寄生与未寄生紫茎泽兰2组盆栽处理，测定泽兰实蝇寄生对紫茎泽兰生长特性、生物量、叶片营养物质、次生代谢物质和保护酶的影响。结果表明，泽兰实蝇寄生显著降低了紫茎泽兰的株高、茎粗、叶片厚度和叶片数，分别显著降低了24.80%、16.86%、42.31%和27.82%；同时，地上生物量、根部生物量和总生物量分别显著降低了58.89%、54.29%和57.60%。泽兰实蝇寄生还导致紫茎泽兰的营养成分发生显著变化，其中可溶性蛋白、可溶性糖、可溶性淀粉和叶绿素含量分别显著降低了41.18%、11.75%、34.57%和29.96%。泽兰实蝇寄生改变了紫茎泽兰的保护酶活性，其过氧化氢酶和超氧化物歧化酶活性分别比未寄生植株显著升高了59.36%和108.06%，过氧化物酶活性降低了25.69%；同时使紫茎泽兰单宁酸含量显著降低了21.67%，总酚和类黄酮的含量分别显著上升了1.21倍和2.09倍。泽兰实蝇寄生的紫茎泽兰总生物量与次生代谢物质总酚和类黄酮的含量呈显著负相关，相关系数r分别为-0.06和-0.43，对照组则不存在相关性。表明泽兰实蝇寄生可能促使紫茎泽兰改变自身的生长与防御能量分配，减少了营养和生长的投入，将更多的资源投向繁殖和防御。 |
| 中文关键词:紫茎泽兰 泽兰实蝇 生长 防御 |
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| Effects of parasitism of eupatorium gall fly Procecidochares utilis on the growth and host defense of Ageratina adenophora |
| Author Name | Affiliation | E-mail | | Jiang Lina | College of Plant Protection, Yunnan Agricultural University, Kunming 650201, Yunnan Province, China | | | Mu Lin | Yunnan Agri-Environmental Protection and Monitoring Center, Kunming 650201, Yunnan Province, China | | | Sun Ang | College of Plant Protection, Yunnan Agricultural University, Kunming 650201, Yunnan Province, China | | | Yue Ying | Yunnan Agri-Environmental Protection and Monitoring Center, Kunming 650201, Yunnan Province, China | | | Liu Mengran | Yunnan Agri-Environmental Protection and Monitoring Center, Kunming 650201, Yunnan Province, China | kmlmr@163.com | | Gui Furong | College of Plant Protection, Yunnan Agricultural University, Kunming 650201, Yunnan Province, China | furonggui18@sina.com |
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| Abstract:To clarify the effects of parasitic natural enemies on the growth and host defense of Ageratina adenophora, two groups of experiments for A. adenophora parasitized by eupatorium gall fly Procecidochares utilis were studied in the greenhouse, and the influences of P. utilis parasitism on the growth, biomass, nutrient composition, secondary metabolites and protective enzyme activities in leaves of A. adenophora were measured. The results showed that the height, stem diameter, leaf thickness and leaf number of A. adenophora were significantly decreased by P. utilis parasitism by 24.80%, 16.86%, 42.31% and 27.82%, respectively. Meanwhile, the aboveground, root and total biomass of A. adenophora decreased significantly by 58.89%, 54.29% and 57.60%, respectively. Compared with unparasitized A. adenophora, several nutrients of the parasitized plants were significantly changed; the contents of soluble protein, soluble sugar, soluble starch and chlorophyll decreased significantly by 41.18%, 11.75%, 34.57%, and 29.96%, respectively. The protective enzymes of A. adenophora were also changed by P. utilis parasitism, and the activities of catalase (CAT) and superoxide dismutase (SOD) increased significantly by 59.36% and 108.06%, respectively, whereas the activity of peroxidase (POD) decreased by 25.69%. In addition, the tannin acid content of A. adenophora was decreased significantly by 21.67%, and the total phenol content and flavonoids content were increased by up to 1.21 times and 2.09 times, respectively. Moreover, a significant negative correlation existed between total biomass and secondary metabolites (total phenol and flavonoids) contents, with a correlation coefficient of -0.06 and -0.43, respectively, but there was no significant correlation in the control group. It indicated that the parasitism by P. utilis might change the energy allocation for growth and host defense in A. adenophora, and result in reduced intake of nutrients and growth, turning more resources into breeding and host defense. |
| keywords:Ageratina adenophora Procecidochares utilis growth defense |
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