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首页> 外文期刊>Journal of Experimental Botany >Pectin enhances rice (Oryza sativa) root phosphorus remobilization
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Pectin enhances rice (Oryza sativa) root phosphorus remobilization

机译：果胶增强水稻（Oryza sativa）根磷的转运

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Plants growing in phosphorus (P)-deficient conditions can either increase their exploration of the environment (hence increasing P uptake) or can solubilize and reutilize P from established tissue sources. However, it is currently unclear if P stored in root cell wall can be reutilized. The present study shows that culture of the rice cultivars 'Nipponbare' (Nip) and 'Kasalath' (Kas) in P-deficient conditions results in progressive reductions in root soluble inorganic phosphate (Pi). However, Nip consistently maintains a higher level of soluble Pi and lower relative cell wall P content than does Kas, indicating that more cell wall P is released in Nip than in Kas. P-deficient Nip has a greater pectin and hemicellulose 1 (HC1) content than does P-deficient Kas, consistent with the significant positive relationship between pectin and root-soluble Pi levels amongst multiple rice cultivars. These observations suggest that increased soluble Pi might result from increased pectin content during P starvation. In vitro experiments showed that pectin releases Pi from insoluble FePO4. Furthermore, an Arabidopsis thaliana mutant with reduced pectin levels (qua1-2), has less root soluble Pi and is more sensitive to P deficiency than the wild type (WT) Col-0, whereas NaCl-treated WT plants exhibit both an increased root pectin content and an elevated soluble Pi content during P-starvation. These observations indicate that pectin can facilitate the remobilization of P deposited in the cell wall. This is a previously unknown mechanism for the reutilization of P in P-starved plants.
机译：在缺磷（P）的条件下生长的植物可以增加对环境的探索（从而增加P的吸收），也可以从已建立的组织来源中溶解和再利用P。但是，目前尚不清楚是否可以重新利用根细胞壁中存储的P。本研究表明，在缺磷条件下培养'Nipponbare'（Nip）和'Kasalath'（Kas）水稻品种会导致根系可溶性无机磷酸盐（Pi）逐渐减少。然而，与Kas相比，Nip始终保持较高的可溶性Pi水平和较低的相对细胞壁P含量，这表明Nip中的细胞壁P释放量要比Kas更多。缺磷的Nip比缺磷的Kas具有更高的果胶和半纤维素1（HC1）含量，这与多个水稻品种中果胶和根溶性Pi水平之间显着的正相关关系相符。这些观察结果表明，可溶性磷的增加可能是由于磷饥饿期间果胶含量的增加。体外实验表明，果胶从不溶性FePO4中释放出Pi。此外，与野生型（WT）Col-0相比，果胶水平降低（qua1-2）的拟南芥突变体具有更低的根溶性Pi和对P缺乏更为敏感，而NaCl处理的WT植物的根部均增加果胶饥饿期间果胶含量和可溶性磷含量升高。这些观察结果表明果胶可以促进沉积在细胞壁中的P的迁移。这是在缺磷的植物中重新利用P的未知机制。

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