Stadler R, Gerlitz N, Werner D (2011)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2011
Book Volume: 248
Pages Range: 225-35
Journal Issue: 1
DOI: 10.1007/s00709-010-0223-8
Developing flowers are important sinks in Arabidopsis thaliana. Their energy demand is covered by assimilates which are synthesized in source leaves and transported via the vasculature. Assimilates are unloaded either symplastically through plasmodesmata or apoplastically by specific transport proteins. Here we studied the pathway of phloem unloading and post-phloem transport in developing gynoecia. Using phloem-mobile fluorescent tracers, we show that phloem unloading into cells of ovule primordia followed a symplastic pathway. Subsequently, the same tracers could not move out of phloem cells into mature ovules anymore. A further change in the mode of phloem unloading occurred after anthesis. In open flowers as well as in outgrowing siliques, the phloem was again unloaded via the symplast. This observed onset of symplastic phloem unloading was accompanied by a change in frequency of MP17-GFP-labeled plasmodesmata. We could also show that the change in cell-cell connectivity was independent of fertilization and increasing sink demand. The presented results indicate that symplastic connectivity is highly regulated and varies not only between different sink tissues but also between different developmental stages.
APA:
Stadler, R., Gerlitz, N., & Werner, D. (2011). A dual switch in phloem unloading during ovule development in Arabidopsis. Protoplasma, 248(1), 225-35. https://doi.org/10.1007/s00709-010-0223-8
MLA:
Stadler, Ruth, Nadja Gerlitz, and Dagmar Werner. "A dual switch in phloem unloading during ovule development in Arabidopsis." Protoplasma 248.1 (2011): 225-35.
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