Resistance of Eight Species of Ash Trees to Emerald Ash Borer and their Mechanisms
American Journal of Agriculture and Forestry
Volume 2, Issue 6, November 2014, Pages: 302-308
Received: Dec. 11, 2014;
Accepted: Dec. 23, 2014;
Published: Dec. 29, 2014
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Shixiang Zong, Key Laboratory of Beijing for the Control of Forest Pests, Beijing Forestry University, Beijing 100 083, China
Jianqiang Lin, Ao Yang Ecology and Agroforestry Limited Company, Jiangsu 215 623, China
Tao Wang, Mentougou Forestry Station, Beijing 102 300, China
Youqing Luo, Key Laboratory of Beijing for the Control of Forest Pests, Beijing Forestry University, Beijing 100 083, China
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Ash tree, Fraxinus (Oleaceae), is a fine species of timber, shelter and scenic tree used for afforestation in China. Emerald ash borer (EAB), Agrilus planipennis Fairmaire, an important trunk borer of ash trees, have caused great damage to ash trees in China, the United States, Canada and other countries. First, adult EAB lays eggs in the bark crevices, then the newly hatched larvae feed on the superficial layers of the bark, and enter the xylem when approaching maturity, causing great damage. Therefore, bark is an important location for the adult oviposition, egg development and larval feeding of EAB. In order to understand the resistance of different species of ash trees and their mechanisms, eight ash trees with varying degrees of resistance to EAB were chosen to further investigate the morphological characteristics of the bark, anatomical structure of the tissue, main nutrients and secondary metabolites. The following results were observed: (1) The resistance of different tree species to EAB was not correlated with the bark color, but was inversely proportional to bark thickness, roughness, lenticel size, and compactness. The thicker, rougher and more compact the bark was, the larger the lenticels were, and in turn the greater the EAB-induced damage was. (2) In the anatomical structure of the bark tissues, the vessel size, wood cell number, wood cell area and stone cell number were shown to be the most important resistance factors, among which vessel area and wood cell area were both negatively correlated with insect resistance, and stone cell number and wood cell number were positively correlated. (3) Among the main nutrients and secondary metabolites, polyphenols, soluble sugars, reducing sugars and flavonoids were shown to be the most important resistance factors, the contents of which in tree species with high resistance were generally higher than those in susceptible tree species. These results provide a theoretical basis and practical guidance for revealing the resistance of different species of ash trees to EAB, and selecting suitable insect resistant tree species.
Emerald Ash Borer, Ash Tree, Bark, Resistance Mechanism
To cite this article
Resistance of Eight Species of Ash Trees to Emerald Ash Borer and their Mechanisms, American Journal of Agriculture and Forestry.
Vol. 2, No. 6,
2014, pp. 302-308.
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