Physiological And Biochemical Changes Of Three Stone Fruit Trees After Inoculated With Lasiodiplodia Theobromae

Gummosis is a common disease found in fruit trees,especially in stone fruit trees,such as peach,cherry,plum,apricot and mume.Peach tree gummosis is a worldwide disease that has been restricting the development of peach industry,especially in South China.However,the symptom of this disease is not obvious on other peach genetically related-stone fruit trees.In this study,Lasiodiplodia theobromae was inoculated on one-year old detached branches of peach,plum and mume,and then changes in morphology,biochemistry and biomass were investigated to understand why peach was easily sensitive to L.theobromae infection.The main results are as follows:1)The lenticel length and density of peach is the biggest among the three stone fruit trees,as the lenticel could facilitate fungi invasion into plant.2)The biomass of L.theobromae in peach branch is bigger than that in the other two fruit trees,but the rule of fungal growth is same among three fruit trees.3)The defense response is vigorous in peach branch,so it might be the cause why peach is most sensitive to L.theobromae among the three stone fruit trees.4)The content of soluble sugar changes obviously in peach branch after inoculation,which may contribute to the gummosis formation.