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CHARACTERISTICS OF HERBIVORY/WOUND-ELICITED electrical signal TRANSDUCTION IN TOMATO

Frontiers of Agricultural Science and Engineering 2021年第2期8卷 292-301页

作者： Chaoyi HU Siqi DUAN Jie ZHOU Jingquan YU Department of Horticulture Zijingang CampusZhejiang UniversityHangzhou 310058China Key Laboratory of Horticultural Plant Growth and Development Ministry of Agriculture and Rural Affairs of ChinaHangzhou 310058China.

electrical signals commonly occur in plants in response to various environmental changes and have a dominant function in plant acclimation.The transduction of wound-elicited electrical signals in the model plant spedes Arabidopsis has been characterized but the characteristics of electrical signal transduction in response to herbivory or wounding in crop species remain unknown.Here,the features of electrical signals elicited by insect herbivory and wounding in tomato were investigated.Unlike those in Arabidopsis,wounding tomato leaves did not cause leaf-to-leaf electrical signal transduction.In contrast,electrical signals elicited in response to petiole wounding were stronger and more strongly transduced.Leaflet wounding also activated electrical signal transduction and jasmonic acid(JA)signaling within the whole compound leaf.It was also demonstrated that tomato glutamate receptor-like 3.3(GLR3.3)and GLR3.5 mediated leaflet-to-leaflet electrical signal transduction.Herbivory-induced JA accumulation and Helicoverpa armigera resistance were reduced in glr3.3/3.5 plants.This work reveals the nature of electrical signal transduction in tomato and emphasizes the key roles of GLR3.3 and GLR3.5 in electrical signal transduction and JA signaling activation.

关键词： electrical signal glutamate receptor-like herbivory jasmonic acid tomato

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Stability of fiber laser-MIG hybrid welding of high strength aluminum alloy

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China Welding 2021年第3期30卷 7-11页

作者：韩永全韩蛟陈岩姚青虎王鹏 School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

The effect of fiber laser on MIG arc was investigated with 8 mm 7075-T6 high strength aluminum alloy as base material.The arc shape,droplet transfer form and electrical signal in the process of MIG welding and laser-MIG hybrid welding were analyzed.The stability of the hybrid welding process was evaluated by standard deviation analysis.The results show that with the increase of laser power,a large number of laser-induced plasma enters the arc column area,providing more conductive channels,which makes the heat of MIG arc more concentrated and the short circuit transition disappear.Due to the continuous effect of laser,the keyhole becomes a continuous electron emission source,and a stable cathode spot will be formed near the keyhole,which enhances the stability of MIG arc at the base current state.By using the method of standard deviation analysis,the voltage standard deviation of single MIG welding arc and laser-MIG hybrid arc within 4 seconds was calculated.The standard deviation of single MIG arc voltage was 1.05,and the standard deviation of MIG arc voltage in laser-MIG hybrid welding was 0.71–0.86,so the hybrid welding process was more stable.

关键词： High strength aluminum alloy fiber laser-MIG hybrid welding arc behavior electrical signal

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