Arabidopsis Proteins Journal Article 57-50-1 Arabidopsis Cell expansion EC 2.7.11.1 F-Box Proteins Kelch repeat domain-containing F-box protein Mannans Oligosaccharides Protein Serine-Threonine Kinases Research Support, U.S. Gov't, Non-P.H.S. SnRK1 protein, Arabidopsis Sucrose Sucrose Non-Fermenting Related Kinase 1 endo-β-1,4-mannanase energy starvation oligosaccharides phenylalanine ammonia lyase phenylpropanoids secondary cell wall xylem