木薯<i>MePYL</i>12基因克隆及采后生理性变质过程的表达分析

郭靖; 章玉香; 黄芷颐; 吴春来; 颜彦; 曾坚; 胡伟

doi:10.19303/j.issn.1008-0384.2021.01.003

木薯MePYL12基因克隆及采后生理性变质过程的表达分析

doi: 10.19303/j.issn.1008-0384.2021.01.003

郭靖^1,,
章玉香¹,
黄芷颐¹,
吴春来²,
颜彦²,
曾坚^{1, 3, ,},
胡伟²

1.
韶关学院英东生物与农业学院，广东　韶关　512005
2.
中国热带农业科学院热带生物技术研究所，海南　海口　571101
3.
韶关市芳香植物工程技术研究中心，广东　韶关　512005

基金项目: 韶关学院重点项目（SZ2018KJ05）；广东省教育厅青年创新人才项目（2018KQNCX234）；韶关市科技计划项目（2019sn087）；国家自然科学基金（31901537）；韶关学院博士启动项目（99000615）

详细信息

作者简介:
郭靖（1989−），男，博士，讲师，研究方向：植物分子生物学（E-mail：jingaj@163.com）

通讯作者:
曾坚（1987−），男，博士，讲师，研究方向：植物分子生物学（E-mail：zengjian@sgu.edu.cn）

中图分类号: S 533
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- 被引次数: 0
出版历程
- 收稿日期: 2020-07-13
- 修回日期: 2020-12-18
- 网络出版日期: 2021-02-08
- 刊出日期: 2021-01-31

Cloning and Post-harvest Physiological Deterioration Expression of MePYL12 of Cassava

GUO Jing^1
,,
ZHANG Yuxiang¹,
HUANG Zhiyi¹,
WU Chunlai²,
Yan Yan²,
ZENG Jian^{1, 3
, ,},
HU Wei²

1.
Henry Fok College of Biology and Agriculture, Shaoguan University, Shaoguan, Guangdong　512005, China
2.
Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan　571101, China
3.
Shaoguan Engineering Research Center for Aromatic Plants, Shaoguan, Guangdong　512005, China

摘要

摘要: 目的脱落酸受体PYL家族基因为ABA信号通路的重要成员。研究PYL基因在木薯块根的采后生理性变质（post-harvest physiological deterioration, PPD）和非生物胁迫中的功能，能够为进一步研究ABA信号在木薯抗逆和PPD过程中的功能奠定基础。方法本研究从木薯品种SC124中通过RT-PCR技术克隆得到了MePYL12基因，对它的蛋白质进行相关生信分析，如遗传进化关系、结构域、蛋白质结构预测、理化性质及基因的启动子元件分析，同时对MePYL12基因在相关处理和木薯PPD过程中的表达量进行分析。结果（1）克隆得到的MePYL12长度为567 bp，氨基酸数量为188，理论等电点为5.55，三级结构预测显示含有典型PYL螺旋手柄结构，与蓖麻和橡胶树中PYL蛋白序列的相似性较高，达到了86.77 %和94.68 %。MePYL12基因的蛋白序列含有PYL蛋白家族的保守结构域，特别是ABA结合的区域“Latch”和“Gate”序列100%一致，这些结果表明MePYL12基因编码的蛋白质属于PYL家族成员并且高度保守。（2）10个木薯组织中的MePYL12基因表达分析显示，该基因在分生组织和叶片中的表达水平最高。（3）MePYL12基因主要的启动子元件为光应答元件（Light-responsive motifs）、干旱诱导元件（Drought-induced motif）、ABA应答元件（ABA responsive motif）等元件。（4）MePYL12基因的表达水平显著受到干旱胁迫和ABA处理诱导。在木薯块根的PPD过程也被显著诱导，在6 h达到最高，随后慢慢下降。结论 MePYL12基因具有提高植物应对非生物胁迫能力的潜能，同时可能参与了木薯块根的PPD过程，也为后续研究相关功能奠定了基础。
- ABA /
- MePYL12 /
- 非生物胁迫 /
- 采后生理性变质 /
- 表达分析
Abstract: Objective Functions of PYL gene in the post-harvest physiological deterioration (PPD) and under abiotic stresses of cassava (Manihot esculenta Crantz) were studied for further research on the key component of the plant abscisic acid (ABA) signaling pathway, PYR/PYL/RCARs family. Method The PYL gene, MePYL12 was cloned from cassava SC 124 by RT-PCR. Bioinformatics was used to analyze the physicochemical properties, conserved domain, genetic evolutionary relationship, protein structure prediction, promoter elements as well as the expressions of MePYL12 in PPD and under abiotic stresses. Result (1) The full-length cDNA of MePYL12 was 567 bp encoded a polypeptide of 188 amino acids with a predicted relative molecular mass of 20.8kD and an isoelectric point of 5.55. The predicted tertiary structure contained a helix. Its multiple protein sequence alignment showed high similarities with the PYL proteins in Hevea brasiliensis (94.68%) and Ricinus communis (86.77 %). MePYL12 consisted of the conserved motifs of the PYL family, such as the ABA binding region "Latch" and "Gate" suggesting it to be a genuine member from the family and highly conserved. (2) The expressions of MePYL12 in 10 different types of cassava tissue/organ were high in the root apical meristem, shoot apical meristem, and leaf. (3) The promoter element analysis showed that the gene contained the light-responsive, drought-induced MBS, and ABA responsive ABRE motifs. (4) The expression of MePYL12 was significantly upregulated by ABA treatment and drought stress as well as during PPD that peaked in 6h followed by downregulation. Conclusion MePYL12 might participate in the PPD process improving the ability of cassava plants in dealing with abiotic stresses. Further study on the functions of MePYL12 in cassava is in order.
- ABA /
- MePYL12 /
- abiotic stress /
- PPD /
- expression analysis

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图 1 MePYL12基因扩增结果

注：M：DNA标志物；1：样品

Figure 1. PCR amplification of MePYL12

Note: M: Marker DNA, 1: sample

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图 2 MePYL12蛋白三级结构预测

Figure 2. Predicted tertiary structure of MePYL12

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图 3 MePYL12结构域分析

Figure 3. Conserved domain analysis on MePYL12

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图 4 MePYL12蛋白序列的同源性比对

注：TKR65798.1银白杨[Populus alba]；XP_002324762.2毛果杨[Populus trichocarpa]；XP_021640277.1橡胶树[Hevea brasiliensis]；XP_002516457.1蓖麻[Ricinus communis]；XP_022731634.1榴莲[Durio zibethinus]；EOY29881.1可可[Theobroma cacao]；KAE8691402.1木瑾[Hibiscus syriacus]；XP_018845809.1核桃[Juglans regia]；XP_030955825.1栎树[Quercus lobata]；XP_006450814.1克来门柚[Citrus clementina]；XP_012077302.1麻风树[Jatropha curcas]；Gate: Gate loop; Latch: Latch loop; TKR65798.1 [Populus alba]; XP_002324762.2 [Populus trichocarpa]; XP_021640277.1 [Hevea brasiliensis]; XP_002516457.1 [Ricinus communis]; XP_022731634.1 [Durio zibethinus]; EOY29881.1 [Theobroma cacao]; KAE8691402.1 [Hibiscus syriacus]; XP_018845809.1 [Juglans regia]; XP_030955825.1 [Quercus lobata]; XP_006450814.1 [Citrus clementina]; XP_012077302.1 [Jatropha curcas]; Gate: 门环；Latch: 锁环;

Figure 4. Homologous sequence alignments of MePYL12

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图 5 PYL基因的系统进化树

Figure 5. Phylogenetic tree of PYL genes

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图 6 不同组织中的MePYL12表达

注：L：叶，M：中脉，S：茎，RAM：根顶端分生组织，P：叶柄，LB：侧芽，OES：分化胚组织，FR：须根，SAM：茎顶端分生组织，SR：根。差异字母则表明在Duncan's 多重比较中显著（P＜0.05）。

Figure 6. Expression of MePYL12 in different tissues/organs of cassava

Note: L: leaf, M: midvein, S: stem, RAM: root apical meristem, P: petole, LB: lateral bud, OES: organized embryogenic structure, FR: fibrous root, SAM: shoot apical meristem, SR: storage root. Different letters: Significant differences based on Duncan's multiple range tests（P＜0.05）.

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图 7 MePYL12基因在不同处理下的表达，A：ABA；B：PEG

注：*代表与0 d差异显著（P＜0.05）；

Figure 7. Expressions of MePYL12 under Treatment A (ABA) and Treatment B (PEG)

Note: * represented significant difference compared to control（0 d）（P＜0.05）；

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图 8 MePYL12基因在PPD中的表达变化

注：*代表与0 h差异显著（P＜0.05）; **表示与0 h差异极显著（P＜0.01）;

Figure 8. Expressions of MePYL12 of cassava tubers in PPD

Note: * represented significant difference compared to control（0 h）（P＜0.05）; ** represented extremely significant difference compared to control（0 h）（P＜0.01）

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表 1 MePYL12启动子元件组成分析

Table 1. Promoter elements of MePYL12

序号 No.	元件名称 Element name	数目 Number	功能预测 Predicted function
1	光应答元件 Box 4	15	光应答 Light-responsive
2	光应答元件 G-Box	1	光应答 Light-responsive
3	ABA应答元件 ABRE	1	ABA应答 Abscisic acid responsive
4	干旱诱导元件 MBS	1	干旱诱导 Drought-inducible
5	胁迫应答元件 TC-rich repeats	1	防御和应激反应 Defense and stress responsiveness
6	水杨酸反应元件 TCA-element	1	水杨酸诱导 Salicylic acid responsiveness

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