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作物学报 ›› 2016, Vol. 42 ›› Issue (10): 1462-1470.doi: 10.3724/SP.J.1006.2016.01462

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

玉米光敏色素A1与A2在各种光处理下的转录表达特性

杨宗举1,2,**,闫蕾2,3,**,宋梅芳2,4,苏亮2,孟凡华2,李红丹1,2,白建荣5,郭林2,*,杨建平2,*   

  1. 1中国农业科学院研究生院, 北京 100081; 2中国农业科学院作物科学研究所, 北京 100081; 3山西大学生物工程学院, 山西太原 030006;  4 北京市辐射中心, 北京 100875; 5山西省农业科学院作物科学研究所, 山西太原 030031
  • 收稿日期:2016-02-06 修回日期:2016-05-09 出版日期:2016-10-12 网络出版日期:2016-06-06
  • 通讯作者: 郭林, E-mail: guolin@caas.cn, Tel: 010-82105851; 杨建平, E-mail: yangjianping02@caas.cn, Tel/Fax: 010-82105859
  • 基金资助:

    本研究由国家重点研发计划试点专项(SQ2016ZY03002918), 国家转基因生物新品种培育重大专项(2016ZX08010002-003-002), 北京市自然科学基金(重点)项目(6151002)和中国农业科学院科技创新工程项目资助。

Transcription Characteristics of ZmPHYA1 and ZmPHYA2 under Different Light Treatments in Maize

YANG Zong-Ju1,2,**,YAN Lei2,3,**,SONG Mei-Fang2,4,SU Liang2,MENG Fan-Hua2,LI Hong-Dan1,2,BAI Jian-Rong5,GUO Lin2,*,YANG Jian-Ping2,*   

  1. 1 Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2 Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3 College of Biology Engineering, Shanxi University, Taiyuan 030006, China; 4 Beijing Radiation Center, Beijing 100875, China; 5 Institute of Crop Science, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China
  • Received:2016-02-06 Revised:2016-05-09 Published:2016-10-12 Published online:2016-06-06
  • Contact: Guo Lin, E-mail: guolin@caas.cn, Tel: 010-82105851; Yang JIanping E-mail: yangjianping02@caas.cn, Tel/Fax: 010-82105859
  • Supported by:

    This study was supported by the National Research and Development Program (SQ2016ZY03002918), the Genetically Modified Organisms Breeding Major Projects of China (2016ZX08010002-003-002), the Key Project of Beijing Natural Science Foundation (6151002) and the Agricultural Science and Technology Innovation Program of CAAS.

摘要:

光敏色素是一类红光/远红光受体, 它们在植物体内有非活性形式的红光吸收型(Pr)和活性形式远红光吸收型(Pfr) 2种状态, 通常其活性形式负责调控植物的种子萌发、株高、开花时间和避荫性等生长发育过程。在禾本科中, 光敏色素只有PHYAPHYBPHYC三个基因亚家族, 古四倍体化造成的玉米光敏色素基因有6个成员, 即PHYA1PHYA2PHYB1PHYB2PHYC1PHYC2光敏色素A参与抑制下胚轴的伸长、促进张开子叶和花青素的积累、阻断持续远红光条件下的变绿。为了评价ZmPHYA1ZmPHYA2对光的响应能力及其功能差异, 本研究采用实时定量PCR技术分析玉米自交系B73和Mo17中ZmPHYA1ZmPHYA2对不同光照处理响应的表达模式。结果表明玉米光敏色素A主要在叶片和花丝中表达, 并且ZmPHYA1转录丰度是ZmPHYA2的2~8倍; 玉米自交系B73和Mo17中胚轴在黑暗、远红光和蓝光条件下较红光和白光下更长。ZmPHYA1ZmPHYA2的转录水平在持续远红光和蓝光条件下均较高; 并且均较迅速响应黑暗到远红光和蓝光光质转换, 但是前者的丰度显著高于后者, ZmPHYA1在远红光下更重要, 而ZmPHYA2在蓝光下更重要。ZmPHYA1ZmPHYA2同样响应于黑暗到红光和白光的转换, 并且ZmPHYA1ZmPHYA2表达模式基本一致。ZmPHYA1ZmPHYA2的表达均能响应长日照和短日照处理, 但是ZmPHYA1转录丰度高于ZmPHYA2的2~5倍。以上结果表明, ZmPHYA1ZmPHYA2的转录能有效地响应各种光处理, 可能ZmPHYA1在作物改良上比ZmPHYA2更有效。本研究为进一步了解ZmPHYA1ZmPHYA2基因功能以及评价二者的光反应能力提供了理论基础。

关键词: 玉米, 光敏色素, 光信号转导, 表达分析, 光处理

Abstract:

Plant phytochromes are a family of red/far-red light photoreceptors, which have two forms in plant: inactive red light absorbing form (Pr) and active far-red light absorbing form (Pfr). During plant growth and developmental processes, phytochromes play pivotal roles in regulations of seed germination, plant height, flowering time, and shade-avoidance. In the grasses, three subfamilies are present: PHYA, PHYB and PHYC. In maize, an ancient genome duplication has increased the family member to six: PHYA1, PHYA2, PHYB1, PHYB2, PHYC1, and PHYC2. Phytochrome A facilitates the inhibition of hypocotyl elongation, opening of the apical hook, expansion of cotyledons, accumulation of anthocyanin and blocking of greening by continuous FR (FRc) light. In order to evaluate the light response capability and difference of transcription abundance between ZmPHYA1 and ZmPHYA2, we employed quantitative real-time PCR (qRT-PCR) assay to investigate the expression patterns of ZmPHYA1 and ZmPHYA2 in the inbred line B73 and Mo17 with different light treatments. The results indicated that both ZmPHYA1 and ZmPHYA2 had a high expression level in leaf and silk, and the transcription abundance of ZmPHYA1 was 2–8 times higher than that of ZmPHYA2. Inbred lines of both B73 and Mo17 possessed longer mesocotyls in dark, far-red and blue light conditions than in red or white light conditions. Both ZmPHYA1 and ZmPHYA2 had a high expression level in far-red and blue lights and rapidly responded to dark-to-far-red and dark-to-blue transitions. ZmPHYA1 was more important under far-red light, so was ZmPHYA2 in blue light. Both of the genes could rapidly respond to transitions from dark to red or white light with similar expression pattern. The both genes also respond to long-day or short-day treatments, however the transcription abundance of ZmPHYA1 was 2–5 times higher than that of ZmPHYA2 during the treatments. All the results suggested that the transcription of both ZmPHYA1 and ZmPHYA2 could rapidly responded to different light treatments; ZmPHYA1 might be more effective than ZmPHYA2 in crop improvement. Our results provide a theoretical basis for the function study and evaluation of light response ability for both ZmPHYA1 and ZmPHYA2.

Key words: Maize, Phytochrome, Light signaling transduction, Expression analysis, Light treatment

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