Novel resources to investigate leaf plasmodesmata formation in C3 and C4 monocots.

IF 6.2 1区 生物学 Q1 PLANT SCIENCES
Hong Ting Tsang, Diep R Ganguly, Robert T Furbank, Susanne von Caemmerer, Florence R Danila
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Abstract

Plasmodesmata (PD) are nanochannels that facilitate cell-to-cell transport in plants. More productive and photosynthetically efficient C4 plants form more PD at the mesophyll (M)-bundle sheath (BS) interface in their leaves than their less efficient C3 relatives. In C4 leaves, PD play an essential role in facilitating the rapid metabolite exchange between the M and BS cells to operate a biochemical CO2 concentrating mechanism, which increases the CO2 partial pressure at the site of Rubisco in the BS cells and hence photosynthetic efficiency. The genetic mechanism controlling PD formation in C3 and C4 leaves is largely unknown, especially in monocot crops, due to the technical challenge of quantifying these nanostructures with electron microscopy. To address this issue, we have generated stably transformed lines of Oryza sativa (rice, C3) and Setaria viridis (setaria, C4) with fluorescent protein-tagged PD to build the first spatiotemporal atlas of leaf pit field (cluster of PD) density in monocots without the need for electron microscopy. Across leaf development, setaria had consistently more PD connections at the M-BS wall interface than rice while the difference in M-M pit field density varied. While light was a critical trigger of PD formation, cell type and function determined leaf pit field density. Complementary temporal mRNA sequencing and gene co-expression network analysis revealed that the pattern of pit field density correlated with differentially expressed PD-associated genes and photosynthesis-related genes. PD-associated genes identified from our co-expression network analysis are related to cell wall expansion, translation and chloroplast signalling.

研究 C3 和 C4 单子叶植物叶质体形成的新资源。
质膜(PD)是促进植物细胞间运输的纳米通道。与光合作用效率较低的 C3 植物相比,光合作用效率较高的 C4 植物在叶片的中叶(M)-束鞘(BS)界面形成的质膜更多。在 C4 叶片中,PD 在促进 M 细胞和 BS 细胞之间的快速代谢物交换方面起着至关重要的作用,以运行一种生化 CO2 浓缩机制,从而提高 BS 细胞中 Rubisco 所在位置的 CO2 分压,进而提高光合效率。控制 C3 和 C4 叶片中 PD 形成的遗传机制在很大程度上是未知的,尤其是在单子叶作物中,这是因为用电子显微镜量化这些纳米结构是一项技术挑战。为了解决这个问题,我们培育了具有荧光蛋白标记的PD的Oryza sativa(水稻,C3)和Setaria viridis(莎草,C4)稳定转化品系,首次建立了无需电子显微镜的单子叶植物叶坑场(PD群)密度时空图谱。在整个叶片发育过程中,与水稻相比,莎草在中-基质壁界面上的PD连接一直较多,而中-间凹坑场密度的差异则各不相同。虽然光是PD形成的关键触发因素,但细胞类型和功能决定了叶坑场密度。互补时序mRNA测序和基因共表达网络分析显示,坑田密度模式与差异表达的PD相关基因和光合作用相关基因相关。从共表达网络分析中发现的PD相关基因与细胞壁扩张、翻译和叶绿体信号传导有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
The Plant Journal
The Plant Journal 生物-植物科学
CiteScore
13.10
自引率
4.20%
发文量
415
审稿时长
2.3 months
期刊介绍: Publishing the best original research papers in all key areas of modern plant biology from the world"s leading laboratories, The Plant Journal provides a dynamic forum for this ever growing international research community. Plant science research is now at the forefront of research in the biological sciences, with breakthroughs in our understanding of fundamental processes in plants matching those in other organisms. The impact of molecular genetics and the availability of model and crop species can be seen in all aspects of plant biology. For publication in The Plant Journal the research must provide a highly significant new contribution to our understanding of plants and be of general interest to the plant science community.
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