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植物角質(zhì)層蠟質(zhì)組成、生物合成及響應(yīng)外界脅迫功能研究進(jìn)展

2024-01-12 04:06劉亞欣高小妹黃夢(mèng)月裴臘明
關(guān)鍵詞:植物學(xué)

劉亞欣 高小妹 黃夢(mèng)月 裴臘明

文章編號(hào):1671-3559(2024)01-0101-05DOI:10.13349/j.cnki.jdxbn.20230426.001

摘要:為了探討植物角質(zhì)層蠟質(zhì)在植物響應(yīng)生物脅迫與非生物脅迫中的功能,為改良植物性狀、提高作物品質(zhì)及作物遺傳育種提供新的資源,對(duì)植物角質(zhì)層蠟質(zhì)的組成、生物合成途徑及功能進(jìn)行綜述:植物角質(zhì)層蠟質(zhì)主要由長鏈脂肪酸及其衍生物即烷烴、醛類、酮類、初級(jí)醇、次級(jí)醇和蠟酯等組成;生物合成途徑可分為3個(gè)步驟,即C16、C18脂肪酸的從頭合成、C16、C18脂肪酸延伸形成長鏈脂肪酸和長鏈脂肪酸通過酰基還原途徑和脫羰基;植物角質(zhì)層蠟質(zhì)在植物響應(yīng)干旱、紫外線輻射和抗病蟲害等非生物和生物脅迫中發(fā)揮重要功能。指出利用新的生物技術(shù)對(duì)蠟質(zhì)功能及作用機(jī)制進(jìn)行深入研究,探討植物的抗逆性,是今后的研究方向。

關(guān)鍵詞:植物學(xué);角質(zhì)層蠟質(zhì);生物脅迫;非生物脅迫;合成機(jī)制

中圖分類號(hào):Q945.78

文獻(xiàn)標(biāo)志碼:A

開放科學(xué)識(shí)別碼(OSID碼):

Research Progresses on Composition, Biosynthesis, and

Functions in Response to Outer Stresses of Plant Cuticular Wax

LIU Yaxin, GAO Xiaomei, HUANG Mengyue, PEI Laming

(School of Biological Science and Technology, University of Jinan, Jinan 250022, Shangdong, China)

Abstract: To explore functions of plant cuticular wax in response to biotic and abiotic stresses, and provide new resources for improving plant traits as well as enhancing crop quality and genetic breeding, composition, biosynthesis pathways, and functions of plant cuticular wax were reviewed, including main composition of plant cuticular wax such as long-chain fatty acids and their derivatives (alkanes, aldehydes, ketones, primary alcohols, secondary alcohols, and wax esters), three steps of biosynthesis pathway such as de novo synthesis of C16 and C18 fatty acids, elongation of C16 and C18 fatty acids to form long-chain fatty acids, and synthesis of wax components through acyl reduction and decarbonylation pathways of long-chain fatty acids, as well as important functions of plant cuticular wax in responses to abiotic and biotic stresses such as drought, ultraviolet radiation and disease and pest resistance. The future research direction was pointed out to be using new biotechnology to research functions and mechanism of wax and discussing stress resistance of plants.

Keywords: botany; cuticle wax; biotic stress; abiotic stress; synthesis mechanism

大多數(shù)植物的地上部分都覆蓋著一層疏水性角質(zhì)層,這是植物抵御外界脅迫的第一道防線,主要由蠟質(zhì)和角質(zhì)組成。角質(zhì)是一種三維聚合物,主要由中間鏈, ω-羥基, C16、C18環(huán)氧羥基脂肪酸通過酯鍵交聯(lián)形成,呈網(wǎng)狀結(jié)構(gòu),角質(zhì)是角質(zhì)層的支撐結(jié)構(gòu)[1]。蠟質(zhì)主要由超長鏈脂肪酸及其衍生物, 如烷

收稿日期:2022-11-21????????? 網(wǎng)絡(luò)首發(fā)時(shí)間:2023-04-27T10:20:01

基金項(xiàng)目:國家自然科學(xué)基金項(xiàng)目(31801278)

第一作者簡介:劉亞欣(1998—),女,山東棗莊人。碩士研究生,研究方向?yàn)橹参锓肿佑N。E-mail:liuyx122345@163.com。

通信作者簡介:裴臘明(1983—),女,山東日照人。副教授,博士,研究方向?yàn)樽魑镞z傳育種。E-mail:mls_peilm@ujn.edu.cn。

網(wǎng)絡(luò)首發(fā)地址:https://kns.cnki.net/kcms/detail/37.1378.N.20230426.1715.002.html

烴、初級(jí)醇、次級(jí)醇、醛、酮和蠟酯等組成,是角質(zhì)層實(shí)現(xiàn)功能的主要承擔(dān)者[2],因此,蠟質(zhì)的功能及合成機(jī)制備受關(guān)注。

1? 植物表皮蠟質(zhì)的組成

大多數(shù)植物表皮蠟質(zhì)主要由超長鏈脂肪酸及其衍生物組成,如烷烴、初級(jí)醇、次級(jí)醇、醛、酮和蠟酯[2],碳鏈長度大多在18~36個(gè)碳原子之間,較少見的有環(huán)狀化合物和甾醇化合物[3]。在不同植物中蠟質(zhì)組分有所不同,如甘蔗的表皮蠟質(zhì)主要由脂肪酸和烷烴組成[4];玉米的表皮蠟質(zhì)主要由醛和初級(jí)醇組成[5];烷烴和酮類是韭菜葉中表皮蠟質(zhì)的主要成分[6]。同一植物不同組織的蠟質(zhì)成分也不同,如紫苜蓿葉的表皮蠟質(zhì)以初級(jí)醇為主,而在莖中烷烴為主[7]。

2? 植物表皮蠟質(zhì)的生物合成

植物表皮蠟質(zhì)的合成途徑可分為3個(gè)步驟:1)C16、C18脂肪酸的從頭合成;2)C16、C18脂肪酸延伸形成蠟質(zhì)合成前提物質(zhì)即超長鏈脂肪酸(VLCFAs);3)VLCFAs通過?;€原途徑和脫羰基途徑合成烷烴、醛類、酮類、初級(jí)醇、次級(jí)醇和蠟酯等蠟質(zhì)組分[8]。以上合成過程在植物表皮細(xì)胞中完成。

2.1? C16、C18脂肪酸的從頭合成

C16、C18脂肪酸的從頭合成是在質(zhì)體中進(jìn)行的。在質(zhì)體中,乙酰輔酶A在乙酰輔酶A羧化酶的催化下,形成丙二酰單酰輔酶A;丙二酰單酰輔酶A在脂肪酸合成酶復(fù)合體的催化下經(jīng)縮合、還原、脫水和還原4步循環(huán)反應(yīng)合成相應(yīng)的?;?ACP,每個(gè)循環(huán)反應(yīng)?;溤黾?個(gè)碳原子。當(dāng)碳鏈長度為16或18時(shí),循環(huán)反應(yīng)停止,C16或C18的?;?ACP被酰基ACP硫酯酶水解成C16或C18脂肪酸。

2.2? 長鏈脂肪酸及其衍生物的合成

脂肪酸的進(jìn)一步延長是在內(nèi)質(zhì)網(wǎng)中進(jìn)行的[9]。C16、C18脂肪酸在胞質(zhì)中被長鏈酰基輔酶A合成酶催化形成相應(yīng)的?;o酶A并轉(zhuǎn)運(yùn)至內(nèi)質(zhì)網(wǎng)中[10]。在內(nèi)質(zhì)網(wǎng)中?;o酶A被脂肪酸延長酶復(fù)合體通過循環(huán)反應(yīng)催化形成C20、C22、…、C36長鏈脂肪酸[11]。該過程與脂肪酸的從頭合成相似,同樣需要經(jīng)4步反應(yīng),即縮合、還原、脫水和還原。脂肪酸延長酶復(fù)合體由β-酮脂酰輔酶A合成酶(KCS)、β-酮脂酰輔酶A還原酶(KCR)、β-羥酯酰輔酶A脫水酶(HCD)和反式烯脂酰輔酶A還原酶(ECR)4種酶組成,每個(gè)循環(huán)反應(yīng)增加2個(gè)碳原子[12-13]。長鏈脂肪酸延伸的限速步驟是由KCS催化的,KCS是限速酶[14]。第1個(gè)編碼KCS酶的基因是從缺少長鏈脂肪酸的擬南芥突變體中分離出來的,因此將該基因命名為FAE1[15]。在擬南芥中,KCS基因家族有21個(gè)成員,其中8個(gè)編碼KCS[16]。AtFAE1(KCS18)在種子發(fā)育過程中發(fā)揮作用,并參與C20、C22、C24、C26脂肪酸的合成[15];AtKCS5參與C26、C28、C30脂肪酸的合成[17]。 在玉米中, GL4是擬南芥CER6(KCS6)的同源基因, 參與幼苗葉片角質(zhì)層蠟質(zhì)的積累[18-19];WSL1和ONI1是水稻中的2個(gè)KCS基因, 分別是葉片角質(zhì)層蠟質(zhì)的生物合成和新鞘正常發(fā)育所必需的[18];在番茄中CER6是的編碼KCS的基因, 參與果實(shí)角質(zhì)蠟質(zhì)的積累[20]。

VLCFAs通過脫羰基途徑和酰基還原基途徑合成各種蠟質(zhì)組分。 在脫羰基途徑中, 主要合成醛類、酮類、烷烴和次級(jí)醇等。 首先VLCFAs被還原成醛類, 然后通過脫羰基反應(yīng)形成烷烴, 烷烴可進(jìn)一步修飾為次級(jí)醇和酮類[21]。 有學(xué)者對(duì)擬南芥中幾個(gè)CER基因在脫羰基途徑中的作用進(jìn)行了研究。 CER3編碼VLCFAs還原酶, 將VLCFAs還原成醛, 在CER3缺失突變體中醛類、烷烴、次級(jí)醇和酮的含量顯著減少[21-24];CER1編碼脫羰基酶, 將醛脫羰基為烷烴, 在CER1缺失突變體中烷烴、次級(jí)醇和酮類的含量顯著減少, 醛類含量略有增加[21, 25-26]。 研究[26]表明, 在擬南芥中CER1與CER3相互作用共同參與烷烴的合成;酵母雙雜實(shí)驗(yàn)證明細(xì)胞色素b5亞型可與CER1和CER3相互作用并作為氧化還原輔助因子參與烷烴的合成。在?;€原途徑中,主要合成初級(jí)醇和蠟酯等。在擬南芥CER4突變體中初級(jí)醇和蠟酯的含量顯著減少,醛類、烷烴、次級(jí)醇和酮的含量略有增加;通過實(shí)驗(yàn)進(jìn)一步證明CER4編碼與醇合成相關(guān)的長鏈脂肪酰輔酶A還原酶,參與植物表皮蠟質(zhì)中初級(jí)醇的合成[27]。蠟酯是由脂肪醇和脂肪酸形成的酯類物, 主要存在于角質(zhì)層中。研究[28]表明,AtWSD1基因所編碼的蛋白是蠟酯合酶或二?;视王;D(zhuǎn)移酶家族中的一員,參與蠟酯的合成。

2.3? 植物表皮蠟質(zhì)的轉(zhuǎn)運(yùn)

在內(nèi)質(zhì)網(wǎng)中合成的各種蠟質(zhì)組分需要轉(zhuǎn)運(yùn)至植物表皮。首先各種蠟質(zhì)組分從內(nèi)質(zhì)網(wǎng)中轉(zhuǎn)運(yùn)到質(zhì)膜,然后通過質(zhì)膜運(yùn)輸?shù)皆|(zhì)體外并通過細(xì)胞壁運(yùn)輸?shù)街参锉砻妫?9-31]。表皮蠟質(zhì)的轉(zhuǎn)運(yùn)是由多種轉(zhuǎn)運(yùn)蛋白介導(dǎo)的。在擬南芥acbp1突變體的莖中蠟質(zhì)的含量有所下降,ACBP1所編碼的酰基輔酶A結(jié)合蛋白1定位于內(nèi)質(zhì)網(wǎng)和質(zhì)膜上,表明ACBP1可能介導(dǎo)蠟質(zhì)組分從內(nèi)質(zhì)網(wǎng)轉(zhuǎn)運(yùn)至質(zhì)膜[32]。其中ABC轉(zhuǎn)運(yùn)蛋白已被證實(shí)參與表皮蠟質(zhì)的轉(zhuǎn)運(yùn):在擬南芥中CER5是ABC轉(zhuǎn)運(yùn)蛋白WBC亞家族的成員,在cer5突變體的莖中表皮蠟質(zhì)的含量僅為野生型的41%[33-34],而表皮細(xì)胞中卻積累了較多的內(nèi)含物,表明CER5所編碼的ABC轉(zhuǎn)運(yùn)蛋白,參與蠟質(zhì)組分從質(zhì)膜向表皮的運(yùn)輸過程[34]。

3? 植物表皮蠟質(zhì)的響應(yīng)外界脅迫功能

表皮蠟質(zhì)是覆蓋于植物地上部分的疏水屏障,作為植物抵御外界脅迫的第一道防線,在生物和非生物脅迫中發(fā)揮重要作用。

3.1? 抗旱與保水功能

干旱是造成土地荒漠化和農(nóng)業(yè)減產(chǎn)的最重要自然災(zāi)害之一[35],因此,植物在進(jìn)化過程中形成了多種抗旱機(jī)制,如發(fā)達(dá)的根系[36]、高效的氣孔結(jié)構(gòu)與調(diào)節(jié)系統(tǒng)[37]、葉片形態(tài)[38]、表皮蠟質(zhì)增厚[39]等。在這些抗旱機(jī)制中,表皮蠟質(zhì)是植物抵御干旱的重要屏障[18]。

表皮蠟質(zhì)是在植物表皮形成的一層防止非氣孔水分流失的疏水層,具有維持植物體內(nèi)水分平衡、防止水分流失的功能,在干旱脅迫中發(fā)揮一定作用。小麥在干旱條件下表皮蠟質(zhì)中的烷烴的質(zhì)量分?jǐn)?shù)增加50%[40];在干旱條件下煙草表皮蠟質(zhì)通過減小氣孔導(dǎo)度來增強(qiáng)植株的抗旱性[41],并通過調(diào)節(jié)氣孔發(fā)育來增強(qiáng)擬南芥的抗旱性[42]。在擬南芥中,在干旱條件下轉(zhuǎn)錄因子AtMYB94可以直接激活參與蠟質(zhì)合成相關(guān)基因的轉(zhuǎn)錄,從而增強(qiáng)植株的抗旱性[43];同時(shí)還有研究[44]報(bào)道了玉米中類似的轉(zhuǎn)錄因子ZmMYB94,通過參與幼苗中表皮蠟質(zhì)的合成來增強(qiáng)植株對(duì)干旱的耐受性。

3.2? 抗紫外線輻射功能

太陽的紫外線輻射通過破壞脫氧核糖核酸(DNA)、膜系統(tǒng)和光合作用系統(tǒng)等對(duì)地球表面的植物造成傷害[45]。在漫長的進(jìn)化過程中,陸地植物進(jìn)化了多種抵御紫外輻射的機(jī)制,例如合成黃酮類或酚類化合物積累在表皮細(xì)胞的液泡、細(xì)胞壁、蠟質(zhì)層或與角質(zhì)單體結(jié)合,提高植物對(duì)紫外線輻射的吸收能力[46]。此外,植物葉表皮毛的結(jié)構(gòu)與密度、蠟質(zhì)層及表皮細(xì)胞層的厚度都會(huì)影響紫外線是否能穿透葉肉細(xì)胞[47];蠟質(zhì)含量高的植物葉片比含量低的葉片能吸收更多的紫外線[48]。隨著紫外線輻射的增加,黃瓜和大麥葉片的角質(zhì)蠟的質(zhì)量分?jǐn)?shù)增加了約25%[49]。在玉米蠟質(zhì)缺失突變體中,玉米植株葉片的葉片形態(tài)與遺傳物質(zhì)均受到紫外線輻射的傷害[48]。研究[50]表明,植物葉表皮蠟對(duì)紫外線輻射有阻隔作用,只有不到1%的紫外線能通過蠟質(zhì)進(jìn)入葉肉細(xì)胞。

3.3? 抗病蟲害功能

在自然環(huán)境中, 植物會(huì)遇到細(xì)菌、真菌、病毒等各種病原體的侵襲, 嚴(yán)重威脅植物的生長和作物的產(chǎn)量[51]。 植物表皮蠟質(zhì)的特殊化學(xué)成分和形態(tài)結(jié)構(gòu)可使植物抵御病原體的侵染[52]。 真菌病原體可以合成或分泌角質(zhì)酶和脂肪酶等水解酶來降解表皮蠟質(zhì)[53]。 例如, 稻瘟病菌可以合成角質(zhì)酶2(CUT2)并黏附于植物體表面, 通過激活CUT2使植株表面的角質(zhì)層滲透性增加,從而降低植株對(duì)稻瘟病菌的抗性[54]。研究[54]表明,角質(zhì)層滲透性的改變可以影響植物的抗病性。MdMYB30過表達(dá)的蘋果愈傷組織對(duì)蘋果潰瘍病表現(xiàn)出較強(qiáng)的抗性,表明MdMYB30正向調(diào)節(jié)蘋果果實(shí)蠟質(zhì)的生物合成,增強(qiáng)蘋果對(duì)某些真菌病原菌的抗性[55]。

4? 展望

表皮蠟質(zhì)是在植物表皮形成的一層防止非氣孔水分流失的疏水層, 可以保護(hù)植物免受強(qiáng)光、干旱、病原體入侵和昆蟲食草動(dòng)物的侵襲。 植物表皮蠟質(zhì)是植物從水生環(huán)境向干旱陸地環(huán)境進(jìn)化而形成的結(jié)構(gòu), 因此研究植物表皮蠟質(zhì)與響應(yīng)各種逆境的調(diào)節(jié)機(jī)制以及角質(zhì)層組分作為信號(hào)分子提高植物對(duì)病原體的敏感性是十分重要的。 隨著分子生物學(xué)的快速發(fā)展, 許多植物表皮蠟質(zhì)合成相關(guān)基因被挖掘, 將為改良植物性狀、提高作物品質(zhì)以及作物遺傳育種提供新的資源。

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