Glomus intraradices induces changes in root system architecture of rice independently of common symbiosis signaling
Glomus intraradices induces changes in root system architecture of rice independently of common symbiosis signaling
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DOI：
10.1111/j.1469-8137.2009.02839.x
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发表时间：
2009-01-01
期刊：
影响因子：
9.4
通讯作者：
Paszkowski, Uta
中科院分区：
文献类型：
--
作者：
Gutjahr, Caroline;Casieri, Leonardo;Paszkowski, Uta
尽管单子叶植物和双子叶植物的根构型和细胞构型不同，但丛枝菌根真菌在大多数单子叶植物和双子叶植物的根部定殖。在丛枝菌根真菌的谷类寄主中，水稻（Oryza sativa）具有由三种不同类型的根组成的独特的根系：冠状根、大侧根和细侧根。特征是冠根和大侧根中通气组织的组成性形成，细侧根中没有皮层。在这里，我们评估了根内球囊霉在根系中的定植分布，并确定了其对根系结构的影响。大侧根优先定植，细侧根对丛枝菌根定植免疫。真菌对大侧根的偏好也发生在sym突变体中，这些突变体阻止了根的定殖超过根皮渗透。本研究结果表明，丛枝菌根真菌在水稻不同根型间的共生特性存在差异，并能诱导出优势组织。此外，丛枝菌根引起的根系变化的信号传导在水稻和M之间不同。蒺藜
Arbuscular mycorrhizal fungi colonize the roots of most monocotyledons and dicotyledons despite their different root architecture and cell patterning. Among the cereal hosts of arbuscular mycorrhizal fungi, Oryza sativa (rice) possesses a peculiar root system composed of three different types of roots: crown roots; large lateral roots; and fine lateral roots. Characteristic is the constitutive formation of aerenchyma in crown roots and large lateral roots and the absence of cortex from fine lateral roots. Here, we assessed the distribution of colonization by Glomus intraradices within this root system and determined its effect on root system architecture.Large lateral roots are preferentially colonized, and fine lateral roots are immune to arbuscular mycorrhizal colonization. Fungal preference for large lateral roots also occurred in sym mutants that block colonization of the root beyond rhizodermal penetration.Initiation of large lateral roots is significantly induced by G. intraradices colonization and does not require a functional common symbiosis signaling pathway from which some components are known to be needed for symbiosis-mediated lateral root induction in Medicago truncatula.Our results suggest variation of symbiotic properties among the different rice root-types and induction of the preferred tissue by arbuscular mycorrhizal fungi. Furthermore, signaling for arbuscular mycorrhizal-elicited alterations of the root system differs between rice and M. truncatula.