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Silencing of early auxin responsive genes MdGH3-2/12 reduces the resistance to Fusarium solani in apple

Journal of Integrative Agriculture 2024年第9期23卷 3012-3024页

作者： Qianwei Liu Shuo Xu Lu Jin Xi Yu Chao Yang Xiaomin Liu Zhijun Zhang Yusong Liu Chao Li Fengwang Ma State Key Laboratory for Crop Stress Resistance and High-Efficiency Production/Shaanxi Key Laboratory of Apple College of HorticultureNorthwest A&F UniversityYangling 712100China

Apple replant disease(ARD)has led to severe yield and quality reduction in the apple *** solani(***)has been identified as one of the main microbial pathogens responsible for ***(indole-3-acetic acid,IAA),an endogenous hormone in plants,is involved in almost all plant growth and development processes and plays a role in plant immunity against *** Hagen3(GH3)is one of the early/primary auxin response *** aim of this study was to evaluate the function of MdGH3-2 and MdGH3-12 in the defense response of *** by treating MdGH3-2/12 RNAi plants with *** results show that under *** infection,RNAi of MdGH3-2/12 inhibited plant biomass accumulation and exacerbated root *** inoculation with ***,MdGH3-2/12 RNAi inhibited the biosynthesis of acid-amido *** led to the inhibition of free IAA combining with amino acids,resulting in excessive free IAA *** excessive free IAA altered plant tissue structure,accelerated fungal hyphal invasion,reduced the activity of antioxidant enzymes(SOD,POD and CAT),increased the reactive oxygen species(ROS)level,and reduced total chlorophyll content and photosynthetic ability,while regulating the expression of PR-related genes including PR1,PR4,PR5 and *** also changed the contents of plant hormones and amino acids,and ultimately reduced the resistance to *** conclusion,these results demonstrate that MdGH3-2 and MdGH3-12 play an important role in apple tolerance to *** and ARD.

关键词： Fusarium solani early auxin responsive gene apple replant disease plant hormone antioxidant

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