LAP3, a novel plant protein required for pollen development, is essential for proper exine formation
We isolated lap3-1 and lap3-2 mutants in ascreen for pollen that displays abnormal stigma binding.Unlike wild-type pollen, lap3-1 and lap3-2 pollen exine isthinner, weaker, and is missing some connections betweentheir roof-like tectum structures. We describe the mappingand identification of LAP3 as a novel gene that contains arepetitive motif found in b-propeller enzymes. Insertionmutations in LAP3 lead to male sterility. To investigatepossible roles for LAP3 in pollen development, we assayedthe metabolite profile of anther tissues containing developingpollen grains and found that the lap3-2 defect leadsto a broad range of metabolic changes. The largest changeswere seen in levels of a straight-chain hydrocarbon nonacosaneand in naringenin chalcone, an obligate compoundin the flavonoid biosynthesis pathway.
Dobritsa, A. A., Nishikawa, S. I., Preuss, D., Urbanczyk-Wochniak, E., Sumner, L. W., Hammond, A., Carlson, A. L. & Swanson, R. J. 2009 LAP3, a novel plant protein required for pollen development, is essential for proper exine formation. Sexual Plant Reproduction 22: 167-177.