Arabidopsis CNGC14 Mediates Calcium Influx Required for Tip Growth in Root Hairs
Arabidopsis CNGC14 Mediates Calcium Influx Required for Tip Growth in Root Hairs
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拟南芥 CNGC14 介导根毛尖端生长所需的钙流入
DOI：
10.1016/j.molp.2017.02.007
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发表时间：
2017
期刊：
影响因子：
27.5
通讯作者：
Luan S
中科院分区：
文献类型：
--
作者：
Zhang Sisi;Pan Yajun;Dong Mengqi;Zhu Huifen;Li Legong;Zhu Huifen;Li Legong;Tian Wang;Luan Sheng;Li LG;Luan S
根毛创造了一个巨大的表面积，以帮助植物获得养分和水分，在土壤中的锚定，和微生物的相互作用。根毛的发育分为两个阶段，包括根毛的起始和根尖的生长。当一部分遗传决定的表皮细胞壁松弛并形成细胞肿胀的盘状区域时，发生起始。当根毛“芽”以极化方式伸长以最终达到具有顶端圆顶的管状生长时，在起始之后发生尖端生长（Grierson等人，2014).极化生长已经在几个模型系统中进行了研究，包括植物中的花粉管和根毛细胞，真菌中的菌丝伸长和动物神经系统中的轴突延伸。钙梯度和振荡在控制这些细胞模型的方向和生长速率方面起着关键作用。然而，在所有情况下，钙信号传导的机制尚未完全理解。在动物系统中，已发现一些钙通道可介导钙通量（Akiyama和Kamiguchi，2015）。然而，很少有人知道的Ca 2+转运蛋白介导的Ca 2+通量在植物细胞。最近的研究已经确定CNGC型通道对于花粉管生长和育性是必需的（Frietsch等人，2007年; Gao等人，2016年）。虽然CNGCs和花粉管中的钙梯度之间的因果关系尚未建立，这些研究表明，CNGCs可能是一个主要的通道组参与植物细胞中的Ca 2+通量。
Root hairs create an enormous surface area to aid plants in nutrient and water acquisition, anchorage in the soil, and microbe interactions. Root hairs develop in two stages, including initiation and tip growth. Initiation occurs when a portion of genetically determined epidermal cells develop wall loosening and form a disc-shaped area of cell swelling. Tip growth happens after initiation when the root-hair ‘‘bud’’elongates in a polarized fashion to eventually reach a tubular outgrowth with an apical dome (Grierson et al., 2014).Polarized growth has been studied in several model systems, including the pollen tube and root-hair cells in plants, hyphae elongation in fungi, and axon extension in animal nerve systems. Calcium gradients and oscillations play a key role in controlling the direction and growth rate of these cell models. In all cases, however, the mechanism of calcium signaling has not been fully understood. In animal systems, some calcium channels have been identified that could mediate calcium fluxes (Akiyama and Kamiguchi, 2015). However, little is known about the Ca2+ transporters that mediate Ca2+ fluxes in plant cells. Recent studies have identified CNGC-type channels as essential for pollen tube growth and fertility (Frietsch et al., 2007; Gao et al., 2016). Although a causal relationship between CNGCs and a calcium gradient in pollen tubes has yet to be established, these studies suggest that CNGCs may be a major group of channels involved in Ca2+ fluxes in plant cells.