Mycorrhiza-induced change in root hair growth is associated with IAA accumulation and expression of EXPs in trifoliate orange under two P levels

文献类型： 外文期刊

第一作者： Liu, Chun-Yan

作者： Liu, Chun-Yan;Zhang, De-Jian;Zou, Ying-Ning;Wu, Qiang-Sheng;Wang, Peng;Kuca, Kamil;Wu, Qiang-Sheng

作者机构：

关键词： AMF; EXPs; IAA synthesis; IAA transport carriers; Root hair density

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

ISSN： 0304-4238

年卷期： 2018 年 234 卷

页码：

收录情况： SCI

摘要： Root hair growth can be regulated by substrate nutrient levels, phytohormones, and arbuscular mycorrhizal (AM) fungi. However, the information about effects of AM fungi and substrate phosphorus (P) levels on root hair features is scarce. This study evaluated the effect of an AM fungus, Funneliformis mosseae, on root hair morphology, root indole-3-acetic acid (IAA) level, indole-3-acetic acid oxidase (IAAO) activity, and expressions of auxin-related genes and expansins (EXPs) in trifoliate orange (Poncirus trifoliate) seedlings under 0.1 mM (P-0.1) and 1.0 mM (P-1) P levels for 16 weeks. AM seedlings showed better root colonization under P-0.1 than under P-1. Under P-0.1 and P-1, mycorrhizal seedlings recorded higher concentrations of P and IAA and lower IAAO activity in roots than non-mycorrhizal seedlings. Root hair density was significantly higher in AM seedlings under P-0.1 but dramatically lower under P-1 than non-AM seedlings. Root hair length and diameter of AM seedlings were significantly increased under P-1 only, relative to non-AM seedlings. Indole-3-pyruvate monooxygenase (PtYUC2) and auxin transporter-like protein 3 (PtLAX3) expressions in roots were significantly up-regulated by mycorrhizal treatment under both P-0.1 and P-1. The transcript levels of root auxin efflux carrier component 2 and 8 (PtPIN2 and PtPIN8) were dramatically down-regulated by mycorrhizal inoculation, irrespective of P levels. Root PtEXPB2, PtEXPA2, and PtEXPA4 expressions were notably up-regulated by mycorrhiza under P-0.1 but down regulated under P-1. These results indicated that mycorrhiza-induced changes in root hair growth is closely related with up-regulated expressions of EXPs and simultaneous IAA accumulation in roots.

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