柠条海藻糖合成相关酶基因的过表达增强转基因植物的抗旱性

IF 0.8 4区 生物学 Q4 PLANT SCIENCES Biologia Plantarum Pub Date : 2022-09-04 DOI:10.32615/bp.2022.023
X.Y. Huang, Y.-Y. Li, Ting Zhao, W-y Liu, Ying-na Feng, L. Wang, Y.-C. Ma, X.‐F. Lin
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引用次数: 0

摘要

缩写:ABA-脱落酸;CAT-过氧化氢酶;GUS-β-葡萄糖醛酸酶;丙二醛;过氧化物酶;ROS活性氧;RWC——相对含水量;超氧化物歧化酶;TPP-海藻糖-6-磷酸磷酸酶;TPS-海藻糖-6-磷酸合成酶;WT-野生型。摘要海藻糖是由海藻糖-6-磷酸合成酶(TPS)和海藻糖-6-磷酸磷酸酶(TPP)两种关键酶合成的,在植物抵抗非生物胁迫和保持生物活性方面发挥着重要作用。因此,TPS和TPP基因的表达直接影响海藻糖的合成和植物的抗逆性。本研究从柠条中鉴定了CkTPS和CkTPP,并研究了海藻糖合成在该沙漠植物适应不利条件中的作用。在根中观察到较高的CkTPS和CkTPP表达,而在叶和茎中的表达要低得多,并且它们的表达在干旱胁迫下上调。组织化学分析表明,由CkTPS和CkTPP启动子驱动的β-葡萄糖醛酸酶表达受到非生物胁迫和植物激素(如脱落酸、赤霉素、茉莉酸甲酯和甘露醇)的强烈诱导,这表明海藻糖的合成可能受到各种信号通路的调节。为了确定海藻糖合成在调节植物干旱反应中的作用的功能机制,将CkTPS和CkTPP引入拟南芥中。与野生型(WT)植物相比,这些转基因植物在干旱胁迫下表现出更高的发芽率、存活率、更少的损伤、更好的芽生长和更长的根。此外,转基因植物的脯氨酸、叶绿素、海藻糖含量和抗氧化酶活性(包括超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT))显著高于野生型对照,丙二醛(MDA)含量低于野生型对照。携带CkTPS和CkTPP的双转基因植物比任何一个转基因植物系都表现出更好的生长和更强的耐旱性。这些结果为进一步了解CkTPS和CkTPP的功能和调控机制,以及它们通过基因工程提高作物抗旱性的可能性提供了理论和实验依据。
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Overexpression of genes encoding enzymes involved in trehalose synthesis from Caragana korshinskii enhances drought tolerance of transgenic plants
Abbreviations : ABA - abscisic acid; CAT - catalase; GUS - β-glucuronidase; MDA - malondialdehyde; POD - peroxidase; ROS reactive oxygen species; RWC - relative water content; SOD - superoxide dismutase; TPP - trehalose-6-phosphate phosphatase; TPS - trehalose-6-phosphate synthase; WT - wild type. Abstract Trehalose, which plays important roles in resistance to abiotic stresses and preservation of biological activity in plants, is synthesized by two key enzymes, trehalose-6-phosphate synthase (TPS) and trehalose-6-phosphate phosphatase (TPP). Therefore, the expressions of the TPS and TPP genes directly affect trehalose synthesis and stress resistance of plants. In this study, CkTPS and CkTPP from Caragana korshinskii were identified, and the role of trehalose synthesis in the adaptation of this desert plant to adverse conditions was investigated. Higher CkTPS and CkTPP expressions were observed in the roots, whereas expressions were much lower in leaves and stems, and their expressions were upregulated under drought stress. Histochemical analyses showed that β-glucuronidase expression driven by the CkTPS and CkTPP promoters was strongly induced by abiotic stresses and phytohormones, such as abscisic acid, gibberellin, methyl jasmonate, and mannitol, which suggests that trehalose synthesis may be regulated by various signaling pathways. To determine the functional mechanism underlying the role of trehalose synthesis in regulating drought response in plants, CkTPS and CkTPP were introduced into Arabidopsis . Compared to wild-type (WT) plants, these transgenic plants showed higher germination rate, survival, less damage, better shoot growth, and longer roots under drought stress. Moreover, transgenic plants had a significantly higher content of proline, chlorophyll, trehalose, and activities of antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), and lower malondialdehyde (MDA) content than WT controls. Double-transgenic plants carrying CkTPS and CkTPP showed better growth and stronger drought tolerance than either single transgenic plant line. These results provide a theoretical and experimental basis for further understanding the function and regulatory mechanism of CkTPS and CkTPP , as well as the possibility of their application for improving drought tolerance in crops through genetic engineering.
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来源期刊
Biologia Plantarum
Biologia Plantarum 生物-植物科学
CiteScore
2.80
自引率
0.00%
发文量
28
审稿时长
3.3 months
期刊介绍: BIOLOGIA PLANTARUM is an international journal for experimental botany. It publishes original scientific papers and brief communications, reviews on specialized topics, and book reviews in plant physiology, plant biochemistry and biophysics, physiological anatomy, ecophysiology, genetics, molecular biology, cell biology, evolution, and pathophysiology. All papers should contribute substantially to the current level of plant science and combine originality with a potential general interest. The journal focuses on model and crop plants, as well as on under-investigated species.
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