Adaptor protein complex 2-mediated endocytosis is crucial for male reproductive organ development in arabidopsis

S. Kim, Z. Xu, K. Song, D. Kim, H. Kang, I. Reichardt, E. Sohn, J. Friml, G. Juergens, I. Hwang, Plant Cell 25 (2013) 2970–2985.


Journal Article | Published | English

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Author
Kim, Soo; Xu, Zheng; Song, Kyungyoung; Kim, Dae; Kang, Hyangju; Reichardt, Ilka; Sohn, Eun; Friml, JiríIST Austria ; Juergens, Gerd; Hwang, Inhwan
Department
Abstract
Fertilization in flowering plants requires the temporal and spatial coordination of many developmental processes, including pollen production, anther dehiscence, ovule production, and pollen tube elongation. However, it remains elusive as to how this coordination occurs during reproduction. Here, we present evidence that endocytosis, involving heterotetrameric adaptor protein complex 2 (AP-2), plays a crucial role in fertilization. An Arabidopsis thaliana mutant ap2m displays multiple defects in pollen production and viability, as well as elongation of staminal filaments and pollen tubes, all of which are pivotal processes needed for fertilization. Of these abnormalities, the defects in elongation of staminal filaments and pollen tubes were partially rescued by exogenous auxin. Moreover, DR5rev:GFP (for green fluorescent protein) expression was greatly reduced in filaments and anthers in ap2m mutant plants. At the cellular level, ap2m mutants displayed defects in both endocytosis of N-(3-triethylammonium-propyl)-4- (4-diethylaminophenylhexatrienyl) pyridinium dibromide, a lypophilic dye used as an endocytosis marker, and polar localization of auxin-efflux carrier PIN FORMED2 (PIN2) in the stamen filaments. Moreover, these defects were phenocopied by treatment with Tyrphostin A23, an inhibitor of endocytosis. Based on these results, we propose that AP-2-dependent endocytosis plays a crucial role in coordinating the multiple developmental aspects of male reproductive organs by modulating cellular auxin level through the regulation of the amount and polarity of PINs.
Publishing Year
Date Published
2013-08-01
Journal Title
Plant Cell
Volume
25
Issue
8
Page
2970 - 2985
IST-REx-ID
507

Cite this

Kim S, Xu Z, Song K, et al. Adaptor protein complex 2-mediated endocytosis is crucial for male reproductive organ development in arabidopsis. Plant Cell. 2013;25(8):2970-2985. doi:10.1105/tpc.113.114264
Kim, S., Xu, Z., Song, K., Kim, D., Kang, H., Reichardt, I., … Hwang, I. (2013). Adaptor protein complex 2-mediated endocytosis is crucial for male reproductive organ development in arabidopsis. Plant Cell, 25(8), 2970–2985. https://doi.org/10.1105/tpc.113.114264
Kim, Soo, Zheng Xu, Kyungyoung Song, Dae Kim, Hyangju Kang, Ilka Reichardt, Eun Sohn, Jirí Friml, Gerd Juergens, and Inhwan Hwang. “Adaptor Protein Complex 2-Mediated Endocytosis Is Crucial for Male Reproductive Organ Development in Arabidopsis.” Plant Cell 25, no. 8 (2013): 2970–85. https://doi.org/10.1105/tpc.113.114264.
S. Kim et al., “Adaptor protein complex 2-mediated endocytosis is crucial for male reproductive organ development in arabidopsis,” Plant Cell, vol. 25, no. 8, pp. 2970–2985, 2013.
Kim S, Xu Z, Song K, Kim D, Kang H, Reichardt I, Sohn E, Friml J, Juergens G, Hwang I. 2013. Adaptor protein complex 2-mediated endocytosis is crucial for male reproductive organ development in arabidopsis. Plant Cell. 25(8), 2970–2985.
Kim, Soo, et al. “Adaptor Protein Complex 2-Mediated Endocytosis Is Crucial for Male Reproductive Organ Development in Arabidopsis.” Plant Cell, vol. 25, no. 8, American Society of Plant Biologists, 2013, pp. 2970–85, doi:10.1105/tpc.113.114264.
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