Abstract
This article is a Commentary on Tang et al. (2020), 228: 1880–1896.
Highlights
Like other GDSLs, OSP1 shows broad esterase activity with artificial substrates but recent work on two rice mutants suggests that GDSLs may have functions beyond cutin and wax metabolism (Fig. 1)
‘We propose that an interplay between a unique proline rich protein in the guard cell wall, and a modified very long chain fatty acids (VLCFAs) component in the overlying wax cuticle, is required to form each stomatal pore.’
Further evidence that lipids may not be the only substrate for these enzymes comes from analysis of the mucilage of Arabidopsis seeds which is rich in carbohydrates yet proteomic analysis suggests several GDSLs are present at high levels (Tsai et al, 2017)
Summary
Like other GDSLs, OSP1 shows broad esterase activity with artificial substrates but recent work on two rice mutants suggests that GDSLs may have functions beyond cutin and wax metabolism (Fig. 1). ‘We propose that an interplay between a unique proline rich protein in the guard cell wall, and a modified VLCFA component in the overlying wax cuticle, is required to form each stomatal pore.’ Plants lacking OSP1 have altered wax composition and occluded stomatal pores
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