孢粉素
生物高聚物
化学
花粉
有机化学
生物
植物
聚合物
作者
Fu‐Shuang Li,Pyae Phyo,Joseph R. Jacobowitz,Mei Hong,Jing‐Ke Weng
出处
期刊:Nature plants
[Springer Nature]
日期:2018-12-17
卷期号:5 (1): 41-46
被引量:155
标识
DOI:10.1038/s41477-018-0330-7
摘要
Sporopollenin is a ubiquitous and extremely chemically inert biopolymer that constitutes the outer wall of all land-plant spores and pollen grains1. Sporopollenin protects the vulnerable plant gametes against a wide range of environmental assaults, and is considered a prerequisite for the migration of early plants onto land2. Despite its importance, the chemical structure of plant sporopollenin has remained elusive1. Using a newly developed thioacidolysis degradative method together with state-of-the-art solid-state NMR techniques, we determined the detailed molecular structure of pine sporopollenin. We show that pine sporopollenin is primarily composed of aliphatic-polyketide-derived polyvinyl alcohol units and 7-O-p-coumaroylated C16 aliphatic units, crosslinked through a distinctive dioxane moiety featuring an acetal. Naringenin was also identified as a minor component of pine sporopollenin. This discovery answers the long-standing question about the chemical make-up of plant sporopollenin, laying the foundation for future investigations of sporopollenin biosynthesis and for the design of new biomimetic polymers with desirable inert properties.
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