The fasciclin-like arabinogalactan protein family of Eucalyptus grandis contains members that impact wood biology and biomechanics
文献类型： 外文期刊
作者： MacMillan, Colleen P. 1 ; Taylor, Lynette 2 ; Bi, Yingdong 3 ; Southerton, Simon G. 4 ; Evans, Rob 5 ; Spokevicius, 1 ;
作者机构： 1.CSIRO Agr Flagship, Canberra, ACT 2601, Australia
2.Univ Melbourne, Dept Forest & Ecosyst Sci, Creswick, Vic 3363, Australia
3.Heilongjiang Acad Agr Sci, Crop Tillage & Cultivat Inst, Harbin 150086, Peoples R China
4.Gondwana Genom Pty Ltd, Deakin, ACT 2600, Australia
5.Univ Melbourne, Richmond, Vic 3121, Australia
关键词： biomechanics;Eucalyptus;fasciclin-like arabinogalactan proteins;FLA;microfibril angle (MFA);wood
期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）
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收录情况： SCI
摘要： Fasciclin-like arabinogalactan protein (FLA) families have been identified and characterised in key plant species, with some members exhibiting functional specialization. Here we identify the FLA family of Eucalyptus grandis, and investigate the roles of three single-FAS domain FLAs, with particular focus on secondary cell-wall formation and wood properties. We use various in-silico approaches to identify and characterise E.grandis genome FLAs, and perform phylogenetic comparisons with other species. For three key FLAs, we perform functional testing including promoter-reporter and overexpression transgenic approaches using eucalypts, poplar and tobacco. Of the 18 eucalypt FLAs identified, several were specifically and highly expressed in stems. The specificity to stem xylem vessel and fibre development was demonstrated with EniFLA1promoter:GUS studies in several species. Testing of select eucalypt FLAs resulted in altered wood development and properties, for example 35S:EgrFLA2 led to a 3 degree reduction in cellulose microfibril angle in eucalypt xylem fibres, and 35S:EgrFLA3 to a reduction in tobacco stem flexural strength. These results indicate that the eucalypt FLA family contains diverse members, and particular members with single FAS domains that are functionally specialized for secondary cell wall growth and properties.
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