SlMIPS2是一种肌醇磷酸合成酶基因,它通过影响番茄幼苗中SlPHL1和SlSPX2的水平来调节磷酸盐稳态。

IF 5.6 2区 生物学 Q1 PLANT SCIENCES Journal of Experimental Botany Pub Date : 2024-11-02 DOI:10.1093/jxb/erae451
Abhishek Roychowdhury, Dolly Kaushik, Jayashri Babaji Bhosale, Rajat Srivastava, Rahul Kumar
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引用次数: 0

摘要

磷(P)是植物在生长发育过程中用于支持各种代谢过程的重要宏量营养元素。最近的研究揭示了肌醇六-基/焦磷酸(InsP6-8)--肌醇(MI)的衍生物--在促进 SYG1/PHO81/XPR1 (SPX) 和磷酸盐饥饿反应(PHR)蛋白之间相互作用中的关键作用。肌醇磷酸合成酶(MIPS)催化 MI 生物合成的第一步。尽管 MIPS 基因在介导植物胁迫响应中的作用已被充分阐明,但其在磷酸盐(Pi)缺乏中的作用在很大程度上仍未被探索。本研究表明,在番茄基因组编码的五个 MIPS 基因中,只有 SlMIPS2 在番茄幼苗 Pi 饥饿的早期阶段被急剧诱导。沉默 SlMIPS2 可改善秧苗的生长,在高 Pi 供应条件下,被沉默植株的总可溶性 Pi 和总 P 水平均有所提高。Silencing SlMIPS2 还导致番茄幼苗中 MI 和 InsP6 含量显著降低。这些 InsP6 含量减少的秧苗积累的 SlSPX2 蛋白水平较低。与此相反,这些植株中的 SlPHL1 水平趋于稳定,这直接表明即使在高 Pi 条件下,SlMIPS2 沉默的秧苗中的该转录因子也能激活磷酸盐饥饿诱导(PSI)基因。结果表明,SlMIPS2 在调控细胞 InsP6 水平和 SPX-PHR 相互作用以控制番茄幼苗的 Pi 平衡方面发挥了新的作用。
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SlMIPS2, a myo-inositol phosphate synthase gene, regulates phosphate homeostasis by influencing SlPHL1 and SlSPX2 levels in tomato seedlings.

Phosphorus (P) is a quintessential macronutrient utilized by plants to support various metabolic processes during growth and development. Recent studies have revealed the pivotal role of inositol hexa-kis/pyrophosphate (InsP6-8), the derivatives of Myo-inositol (MI), in facilitating the interaction between SYG1/PHO81/XPR1 (SPX) and Phosphate starvation response (PHR) proteins. Myo-inositol phosphate synthase (MIPS) catalyzes the first committed step in MI biosynthesis. Although the role of MIPS genes in mediating stress responses in plants is well elucidated, its role in phosphate (Pi) deficiency remains largely unexplored. This study demonstrates that out of the five MIPS genes encoded by the tomato genome, only SlMIPS2 is sharply induced at an early stage of Pi starvation in tomato seedlings. Silencing of SlMIPS2 led to improved seedling growth with enhanced total soluble Pi and total P levels in the silenced plants under high Pi availability. SlMIPS2 silencing also caused a significant reduction in MI and InsP6 content in the tomato seedlings. These seedlings with depleted InsP6 levels accumulated lower levels of SlSPX2 protein. In contrast, stabilized SlPHL1 levels were noticed in these plants, directly implicating this transcription factor in activating phosphate starvation inducible (PSI) genes in the SlMIPS2-silenced seedlings, even under high Pi conditions. The results assign a novel role to SlMIPS2 in regulating cellular InsP6 levels and SPX-PHR interactions to control Pi homeostasis in tomato seedlings.

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来源期刊
Journal of Experimental Botany
Journal of Experimental Botany 生物-植物科学
CiteScore
12.30
自引率
4.30%
发文量
450
审稿时长
1.9 months
期刊介绍: The Journal of Experimental Botany publishes high-quality primary research and review papers in the plant sciences. These papers cover a range of disciplines from molecular and cellular physiology and biochemistry through whole plant physiology to community physiology. Full-length primary papers should contribute to our understanding of how plants develop and function, and should provide new insights into biological processes. The journal will not publish purely descriptive papers or papers that report a well-known process in a species in which the process has not been identified previously. Articles should be concise and generally limited to 10 printed pages.
期刊最新文献
Evolution of light-dependent functions of GIGANTEA. β-aminobutyric acid-induced resistance in postharvest peach fruit involves interaction between the MAPK cascade and SNARE13 protein in salicylic acid-dependent pathway. Advances in grape and pathogen genomics toward durable grapevine disease resistance. Host dependent specialized metabolism of nitrogen export in actinorhizal nodules induced by Frankia cluster-2. SlMIPS2, a myo-inositol phosphate synthase gene, regulates phosphate homeostasis by influencing SlPHL1 and SlSPX2 levels in tomato seedlings.
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