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油菜素唑抗性1介导油菜素甾醇诱导的卡尔文循环以促进番茄光合作用。

BRASSINAZOLE RESISTANT 1 Mediates Brassinosteroid-Induced Calvin Cycle to Promote Photosynthesis in Tomato.

作者信息

Yin Xiaowei, Tang Mingjia, Xia Xiaojian, Yu Jingquan

机构信息

Department of Horticulture, Zhejiang University, Hangzhou, China.

Key Laboratory of Horticultural Plants Growth, Development, and Quality Improvement, Agricultural Ministry of China, Hangzhou, China.

出版信息

Front Plant Sci. 2022 Jan 20;12:811948. doi: 10.3389/fpls.2021.811948. eCollection 2021.

DOI:10.3389/fpls.2021.811948
PMID:35126434
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8810641/
Abstract

Calvin cycle is a sequence of enzymatic reactions that assimilate atmospheric CO in photosynthesis. Multiple components are known to participate in the induction or suppression of the Calvin cycle but the mechanism of its regulation by phytohormones is still unclear. Brassinosteroids (BRs) are steroid phytohormones that promote photosynthesis and crop yields. In this study, we study the role of BRs in regulating Calvin cycle genes to further understand the regulation of the Calvin cycle by phytohormones in tomatoes. BRs and their signal effector BRASSINAZOLE RESISTANT 1 (BZR1) can enhance the Calvin cycle activity and improve the photosynthetic ability. BRs increased the accumulation of dephosphorylated form of BZR1 by 94% and induced an 88-126% increase in the transcription of key genes in Calvin cycle , and . BZR1 activated the transcription of these Calvin cycle genes by directly binding to their promoters. Moreover, silencing these Calvin cycle genes impaired 24-epibrassinolide (EBR)-induced enhancement of photosynthetic rate, the quantum efficiency of PSII, and and . Taken together, these results strongly suggest that BRs regulate the Calvin cycle in a BZR1-dependent manner in tomatoes. BRs that mediate coordinated regulation of photosynthetic genes are potential targets for increasing crop yields.

摘要

卡尔文循环是光合作用中一系列同化大气中二氧化碳的酶促反应。已知多种成分参与卡尔文循环的诱导或抑制，但植物激素对其调控的机制仍不清楚。油菜素内酯（BRs）是一类促进光合作用和作物产量的甾体植物激素。在本研究中，我们研究了BRs在调控卡尔文循环基因中的作用，以进一步了解植物激素对番茄卡尔文循环的调控。BRs及其信号效应因子抗油菜素唑1（BZR1）可以增强卡尔文循环活性并提高光合能力。BRs使BZR1的去磷酸化形式积累增加了94%，并使卡尔文循环关键基因 、 和 的转录增加了88%-126%。BZR1通过直接结合这些卡尔文循环基因的启动子来激活它们的转录。此外，沉默这些卡尔文循环基因会削弱24-表油菜素内酯（EBR）诱导的光合速率增强、PSII量子效率以及 和 。综上所述，这些结果强烈表明，BRs在番茄中以BZR1依赖的方式调控卡尔文循环。介导光合基因协同调控的BRs是提高作物产量的潜在靶点。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5d22/8810641/a68b8e2aa646/fpls-12-811948-g007.jpg
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