Journal
BMC PLANT BIOLOGY
Volume 19, Issue -, Pages -Publisher
BMC
DOI: 10.1186/s12870-019-1711-4
Keywords
Anther cuticle; Oryza sativa; OsTKPR1; Pollen exine; Sporopollenin
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Funding
- China Postdoctoral Science Foundation [2017 M611545]
- National Natural Science Foundation of China [31430009, 31322040, 31271698]
- National Key Research and Development Program of China [2016YFD0100804, 2016YFE0101000]
- National Key Basic Research Development Program of the Ministry of Science and Technology, China [2013 CB126902]
- Innovative Research Team, Ministry of Education
- 111 Project [B14016]
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Background During pollen wall formation in flowering plants, a conserved metabolon consisting of acyl-CoA synthetase (ACOS), polyketide synthase (PKS) and tetraketide alpha-pyrone reductase (TKPR), is required for sporopollenin synthesis. Despite this, the precise function of each of these components in different species remains unclear. Results In this study, we characterized the function of OsTKPR1, a rice orthologue of Arabidopsis TKPR1. Loss of function of OsTKPR1 delayed tapetum degradation, reduced the levels of anther cuticular lipids, and impaired Ubisch body and pollen exine formation, resulting in complete male sterility. In addition, the phenylpropanoid pathway in mutant anthers was remarkably altered. Localization studies suggest that OsTKPR1 accumulates in the endoplasmic reticulum, while specific accumulation of OsTKPR1 mRNA in the anther tapetum and microspores is consistent with its function in anther and pollen wall development. Conclusions Our results show that OsTKPR1 is indispensable for anther cuticle development and pollen wall formation in rice, providing new insights into the biochemical mechanisms of the conserved sporopollenin metabolon in flowering plants.
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