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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >A dual switch in phloem unloading during ovule development in Arabidopsis
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A dual switch in phloem unloading during ovule development in Arabidopsis

机译：拟南芥胚珠发育过程中韧皮部卸载的双重转换

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摘要

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.
机译：发育中的花是拟南芥中的重要汇。它们的能量需求被同化物覆盖，这些同化物在源叶中合成并通过脉管系统运输。同化物通过线粒体共生地被卸载，或者通过特定的转运蛋白非质生地被卸载。在这里，我们研究了韧带发育中韧皮部卸载和韧皮部后运输的途径。使用韧皮部移动荧光示踪剂，我们显示韧皮部卸载到胚珠原基细胞中遵循共生途径。随后，相同的示踪剂不再能够从韧皮部细胞中移出，进入成熟的胚珠。花后，韧皮部卸载模式发生了进一步变化。在开放的花朵以及外生的长角果中，韧皮部通过共生体再次被卸载。这种观察到的共生韧皮部卸载的发作伴随着MP17-GFP标记的胞浆瘤频率的变化。我们还可以证明，单元间连接性的变化与施肥和水槽需求的增加无关。提出的结果表明，共生连通性受到高度调节，不仅在不同的汇槽组织之间而且在不同的发育阶段之间都变化。

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