Salicylate metabolism in Populus

IUFRO Tree Biotechnology Conference 2011: From Genomes to Integration and Delivery

Chung Jui Tsai ; Wenbing Guo ; Benjamin Babst ; Batbayar Nyamdari ; Yinan Yuan ; Raja Payyavula ; Han-Yi Chen ; Xue Liangjiao ; Kate Tay ; Vanessa Michelizzi ; Scott Harding

Others  :  http://www.biomedcentral.com/content/pdf/1753-6561-5-S7-I9.pdf
PID  :  46266

来源: CEUR

【 摘 要 】

Phenolic metabolites that contain salicylic acid (SA)-like moieties are major non-structural constituents in Populus leaves, shoots and roots. These so-called phenolic glycosides (PGs) are taxonomically limited to the Salicaceae, where they are known to mitigate insect and animal herbivory. SA itself is an important signaling molecule in plant defense and abiotic stress responses, and is derived from the isochorismate or phenylpropanoid pathways, depending on the species [1,2]. Hyperaccumulation of SA reduces growth in Arabidopsis[3], while high levels of PG have been associated with reduced growth in Populus[4]. Although the common PGs, salicin, salicortin, and their derivatives contain a salicyl moiety, a direct metabolic relationship between PG and SA in Populus has not been shown. We have therefore been using stable isotope tracers, cell culture feeding, functional genomics and transgenic perturbation to probe the relationship between SA, PG and growth in Populus.[First Paragraph]