Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (4): 126-142.doi: 10.13560/j.cnki.biotech.bull.1985.2021-1048

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Identification of Low Temperature Stress-responsive Genes Regulating Photosynthetic Characteristics in the Leaves of Brassica napus by RNA-Seq

JIN Jiao-jiao1(), LIU Zi-gang2, MI Wen-bo2, XU Ming-xia2, ZOU Ya2, XU Chun-mei2, ZHAO Cai-xia3   

  1. 1. College of Agriculture and Forestry,Longdong University/Longdong Co-Innovation Center for Germplasm Improvement and Industrialization of Dryland Crops/ Gansu Province Germplasm Innovation and Application Engineering Research Center of Dryland Winter Wheat,Qingyang 745000
    2. Gansu Provincial Key Laboratory of Arid Land Crop Sciences/College of Agronomy,Gansu Agricultural University,Lanzhou 730070
    3. Institute of Agriculture,Tibet Academy of Agriculture and Animal Husbandry Sciences,Lhasa 860000
  • Received:2021-08-17 Online:2022-04-26 Published:2022-05-06

Abstract:

In order to clarify the response of photosynthetic characteristics to low temperature stress in Brassica napus L.,using cold-resistant material 17NS and cold-sensitive material NF24 as study object,Illumina HiSeqTM 2000 platform was applied to have RNA-Seq analysis,the molecular mechanism of B. napus responding to low temperature,such as leaf morphology,photosynthetic parameters,leaf ultrastructure and gene regulation expression pattern treated at -4℃ for 24 h was investigated. The results showed that the photosynthetic pathway and the photosynthesis-antenna protein pathway were significantly enriched in B. napus in response to low temperature stress. In these two pathways,64 genes were specifically expressed,including 8 up-regulated genes and 56 down-regulated genes,most of which were noted in molecular composition and biological process. It was confirmed that photosynthesis was related to leaf wilt,chloroplast number and morphology change,thylakoid structure damage and relative electrolyte permeability increase. qRT-PCR analysis showed that the expression patterns of the first 17 DEGs were consistent with RNA-Seq analysis results,confirming the reliability of RNA-Seq results. BnFd1LOC106350097)and BnCP26LOC106440450)were up-regulated in response to cold stress. The amino acid product encoded by BnFd1was the chloroplast ferridoretin 1(BnFd1),an unstable hydrophilic protein,which were located in the chloroplast and cytoplasm,there was a signal peptide,belonging to the PLNO3136 superfamily and had a conserved Fd1 domain. The amino acid product encoded by BnCP26 was the chlorophyll a-b binding protein CP26(BnCP26)on thylakoid,it was a stable hydrophilic protein located in chloroplast without signal peptide,and belonged to the chlorophyll a_b binding superfamily and had a conserved chlorophyll a-b binding protein domain. Two cold response genes BnFd1 and BnCP26 are successfully identified in B. napus L.,which are closely related to the regulation of photosynthetic characteristics and had conserved interspecies functions.

Key words: Brassica napus L., low temperature stress, differential expressed genes, BnFd1, BnCP26