NAC类转录因子在‘砀山酥梨’黄化叶复绿过程中的表达分析
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1.安徽农业大学园艺学院;2.贵阳市农业试验中心;3.安徽农业大学 园艺学院

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国家现代农业产业技术体系建设专项(CARS-28-14)


Expression analysis of NAC transcription factors in the retrieved green leaves of ‘Dangshansuli’ pear (Pyrus bretschneideri Rehd.)
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China Agriculture Research System (Grant No. CARS-28-14)

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    摘要:

    为探讨NAC转录因子在梨缺铁黄化叶复绿过程中的表达特性,并筛选响应该过程的核心NAC因子,以清水处理正常梨树叶片(N)和黄化梨树叶片(C)为对照(CN和CC),再次探讨了外源0.2% FeSO4溶液对梨缺铁黄化叶复绿和Fe2+积累的影响,研究了其关键PbrNAC基因的生物学性质,组织表达特异性以及复绿过程中的表达模式,并阐述了其与叶内Fe2+积累的关联性。其结果表明,(1)于N和C内共鉴定到含NAM结构域的21个显著差异表达的PbrNAC基因,涉及8个亚族,其长度不均,motif数从4到9不等,内含子数较少。(2)该基因倾向于根中表达,且均可响应缺铁黄化叶的复绿,其中Pbr032231.1/Pbr021393.1/Pbr026635.1/Pbr038615.1/Pbr019210.3/Pbr019212.1/Pbr002372.1这7个基因在CC内的表达量显著低于CN内表达量,且FeSO4处理后,其各时期表达量均较CC显著上调;与之相反,Pbr007284.1/Pbr016205.1/Pbr007673.1等14个PbrNAC基因均在CC内显著高表达,而FeSO4处理后,其各时期表达量总体较CC显著下降。(3)各叶样内Fe2+含量与Pbr007284.1/Pbr016205.1/Pbr007673.1基因的表达量呈显著负相关,且该3个基因的表达与Pbr016932.1/Pbr027956.1/Pbr029956.1/Pbr026635.1等基因的表达显著相关。(4)多数PbrNAC在正常梨树根系和黄化梨树根系中的表达趋势与其在CN和CC内的表达趋势基本一致,说明其在地下部根系与地上部叶内可能存在表达协同性。以上结果表明,梨PbrNAC基因可能与梨树缺铁胁迫响应和缺铁黄化叶的复绿相关,其中Pbr007284.1/Pbr016205.1/Pbr007673.1可能起重要调控作用。

    Abstract:

    To explore the role of NAC transcription factors (TFs) in the progress of the retrieved green of Fe-deficiency chlorotic leaves in ‘Dangshansuli’ pear (Pyrus bretschneideri Rehd.), PbrNAC TFs were screened in the pear leaves, and the expression patterns of key PbrNACs in response to the retrieved green progress were analyzed. In this study, normal leaves (N) and chlorotic leaves (C) of ‘Dangshansuli’ pear were taken as test material, and exogenous 0.2% FeSO4 (2 g/L FeSO4) solution was sprayed on C during the growing season to confirm its effect and Fe2+ accumulation in C, with N and C treated with distilled water as the control (CN and CC). We have studied the biological properties, tissue-specific expression, and response patterns of the key PbrNAC in this progress. Moreover, the correlation analysis between the expression of PbrNAC with Fe2+ content was carried out. The results showed, (1) A total of 21 PbrNAC genes with typical NAM domain were significantly differently expressed between N and C, which could be clustered into 7 subclasses with fewer introns and with motifs ranging from 4 to 9. (2) Most of the PbrNAC genes preferred to express in the roots, and all the genes could respond to the retrieved green progress of C. Among them, the expression levels of the seven genes named Pbr032231.1/Pbr021393.1/Pbr026635.1/Pbr038615.1/Pbr019210.3/Pbr019212.1/Pbr002372.1 was significantly lower in CC than that in CN, and after FeSO4 treatment, their expression was significantly increased compared to that of CC; In contrast, the expression levels of 14 PbrNAC genes, including Pbr007284.1/Pbr016205.1/Pbr007673.1, were notably higher in CC than that in CN, and after FeSO4 treatment, they were more likely to increase with statistical differences. (4) The Fe2+ content in leaves was significantly negatively associated with the expression of Pbr007284.1/Pbr016205.1/Pbr007673.1. Although other NAC TFs did not show a direct linkage with the Fe2+ accumulation, there is a certain relationship between them and Pbr007284.1/Pbr016205.1/Pbr007673.1, such as Pbr016932.1/Pbr027956.1/Pbr029956.1/Pbr026635.1. (4) Consistent with the difference in the transcript level in aboveground leaves, the expression of Pbr007284.1/Pbr016205.1/Pbr007673.1 homologs in roots of normal pear trees were also prominently higher than that in roots of chlorotic pear trees, implying a synergistic regulatory effect. Overall, PbrNAC genes may be related to the retrieved green progress of CC, and may be involved in Fe deficiency response in pear, where Pbr007284.1, Pbr016205.1, and Pbr007673.1 might play a vital regulatory role.

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郭国凌,余桃,汤小美,等. NAC类转录因子在‘砀山酥梨’黄化叶复绿过程中的表达分析[J].西北植物学报,2023,43(12):1994-2004

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  • 收稿日期:2023-07-10
  • 最后修改日期:2023-09-21
  • 录用日期:2023-10-12
  • 在线发布日期: 2023-12-04
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