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      植物根際促生菌提高植物耐鹽性研究進(jìn)展

      2023-10-09 08:48:44陳夢(mèng)霞
      南方農(nóng)業(yè)·上旬 2023年7期
      關(guān)鍵詞:鹽脅迫耐鹽性研究進(jìn)展

      陳夢(mèng)霞

      摘 要 鹽脅迫是限制農(nóng)業(yè)生產(chǎn)力的主要因素之一,土壤鹽分已成為影響農(nóng)業(yè)發(fā)展的一個(gè)重大阻礙。植物根際促生菌(PGPR)是附著在植物根部或者土壤的有益菌類(lèi),它既可促進(jìn)植物生長(zhǎng)、提高吸收和利用礦物質(zhì)的效率、抵抗病原菌的侵害,又可增強(qiáng)植物的耐鹽性。為改善鹽漬土環(huán)境,促進(jìn)植物生長(zhǎng),提高作物產(chǎn)量提供參考,主要論述了鹽脅迫環(huán)境對(duì)植物、土壤微生物的影響,以及PGPR誘導(dǎo)植物耐鹽性的相關(guān)機(jī)制,并對(duì)今后PGPR的發(fā)展進(jìn)行了展望。

      關(guān)鍵詞 鹽脅迫;植物根際促生菌(PGPR);耐鹽性;研究進(jìn)展

      中圖分類(lèi)號(hào):S154.38+1 文獻(xiàn)標(biāo)志碼:C DOI:10.19415/j.cnki.1673-890x.2023.13.004

      目前,全球鹽堿土分布范圍與占地面積越來(lái)越大,面積已超過(guò)8.33億hm2,其中大多分布在非洲、亞洲和拉丁美洲的自然干旱或半干旱地帶。我國(guó)鹽漬土面積約為0.99億hm2,占全球1/10以上,這對(duì)我國(guó)糧食和生態(tài)安全造成了嚴(yán)重的影響。

      土壤鹽漬化形成的原因有很多種,比如海平面上升和熱帶風(fēng)暴潮導(dǎo)致的氣候變化會(huì)增加土壤和水中鹽分[1],地底深部含鹽地下水中的巖鹽和石膏的溶解導(dǎo)致地下水鹽度增加[2],人為活動(dòng)可以將土壤鹽濃度提高到影響土壤質(zhì)量、微生物、植物和動(dòng)物生命的水平[3]。此外,堆肥中含有較高濃度的可溶性鹽,也可導(dǎo)致土壤鹽分含量偏高[4]。研究表明,植物根際促生菌(PGPR)與植物根系相互作用,可以減輕鹽分脅迫以提高作物生產(chǎn)力[5]。PGPR也被用作生物接種劑,用于提高作物產(chǎn)量、防治植物病原體和改善土壤健康[6]。PGPR能很好地適應(yīng)極端環(huán)境,為生物肥料和生物防治劑提供一個(gè)未開(kāi)發(fā)的倉(cāng)庫(kù),以抵御農(nóng)業(yè)生態(tài)系統(tǒng)中的鹽脅迫[7]。

      1? ?鹽脅迫對(duì)植物的影響

      鹽脅迫是影響植物生長(zhǎng)發(fā)育的主要因素,鹽脅迫持續(xù)時(shí)間越長(zhǎng),植物受損程度越嚴(yán)重。在鹽脅迫條件下,細(xì)胞內(nèi)的Na+濃度增加,達(dá)到細(xì)胞毒性水平,最終導(dǎo)致離子穩(wěn)態(tài)失衡[8]。為了維持自身的離子平衡,植物通過(guò)Na+/H+反轉(zhuǎn)運(yùn)蛋白將細(xì)胞質(zhì)中多余的Na+去除,以換取更多的H+,位于質(zhì)膜上的Na+/H+反轉(zhuǎn)運(yùn)蛋白將Na+轉(zhuǎn)運(yùn)到質(zhì)外體[9]。鹽脅迫也會(huì)影響植物的滲透穩(wěn)態(tài),比如細(xì)胞膨脹壓力縮小,質(zhì)膜收縮,細(xì)胞壁也會(huì)發(fā)生改變,此時(shí)植物則主要依賴(lài)于從基因表達(dá)和滲透物生物合成酶的激活到水運(yùn)輸系統(tǒng)的過(guò)程的滲透信號(hào)通路,以此改變植物細(xì)胞的滲透壓。

      2? PGPR多樣性研究進(jìn)展

      土壤中含有大量的微生物,包括細(xì)菌、真菌、病毒等,與植物根際相關(guān)的微生物更是種類(lèi)繁多,構(gòu)成了復(fù)雜的植物相關(guān)微生物群落[10]。其中,PGPR可以促進(jìn)植物生長(zhǎng)或控制病原體,通過(guò)接種該類(lèi)細(xì)菌可以促進(jìn)植物發(fā)育并減輕病原體侵害和非生物脅迫[11]。

      PGPR分布范圍廣泛,并且具有豐富的多樣性。Sankalp等在印度北方邦農(nóng)業(yè)氣候區(qū)分離出了1 125種能夠耐受1M NaCl的細(xì)菌,其中有560種以1-氨基環(huán)丙烷基羧酸(ACC)作為唯一氮源,經(jīng)過(guò)細(xì)菌包被、種子萌發(fā)、耐受能力、16S rRNA等實(shí)驗(yàn)與分析,最終確定芽孢桿菌屬(Bacillus)是西部平原地區(qū)的優(yōu)勢(shì)屬,對(duì)提高水稻幼苗的生物量具有積極作用[12-13]。He等人從中國(guó)西北部的甘肅省騰格里沙漠的梭梭樹(shù)的根際分離出編號(hào)為M30-35的菌株,M30-35是假單胞菌屬(Pseudomonas adaceae)中的一個(gè)新種;結(jié)果表明M30-35通過(guò)增加枝條鮮重和干重、葉綠素含量、根體積、根活性、葉過(guò)氧化氫酶活性、可溶性糖和脯氨酸含量顯著增強(qiáng)多年生黑麥草的生長(zhǎng)和耐鹽性[14]。除了沙漠和平原,在高原地區(qū)也存在一定的鹽堿土,但因其海拔較高、氧氣稀薄、紫外線強(qiáng)等原因,可種植的農(nóng)作物并不多,故對(duì)高原地區(qū)PGPR提高植物耐鹽性的研究相對(duì)較少。

      3? PGPR介導(dǎo)的鹽脅迫耐受機(jī)制研究進(jìn)展

      鹽脅迫下,植物會(huì)發(fā)生各種生化變化,包括抗氧化酶的激活、植物激素的調(diào)節(jié)、離子吸收的變化、活性氧(ROS)的產(chǎn)生和光合作用途徑的破壞[15],PGPR可以通過(guò)多種方式促進(jìn)植物共生體的生長(zhǎng),從而針對(duì)多種脅迫因素提供交叉保護(hù)[16]。

      3.1? ?激活抗氧化酶

      PGPR具有合成代謝抗氧化物的能力,可在植物體內(nèi)起到緩解植物氧化損傷、增強(qiáng)植物耐鹽能力的作用。此外,PGPR還參與植物體內(nèi)基因調(diào)控,誘導(dǎo)相應(yīng)基因表達(dá),參與氧化物清除。植物接種PGPR有助于降低水稻在鹽分條件下的植物細(xì)胞膜指數(shù)、細(xì)胞半胱天冬酶樣蛋白酶活性和程序性細(xì)胞死亡,從而降低活性氧的毒性,為植物提供耐鹽能力并增加細(xì)胞活力,在植物對(duì)鹽脅迫的正向適應(yīng)中發(fā)揮重要的生長(zhǎng)調(diào)節(jié)作用[17]??死撞↘lebsiella)的分離菌株SURYA6可以產(chǎn)生高活性的抗氧化酶,如超氧化物歧化酶(SOD)、過(guò)氧化氫酶(CAT)和谷胱甘肽氧化酶等,還可以產(chǎn)生各種PGP、鹽等改善和提高抗氧化代謝物的潛力,使其成為鹽分壓力管理的潛在生物接種劑[18]。能產(chǎn)生類(lèi)胡蘿卜素的耐鹽細(xì)菌迪茨氏菌(Dietzia natronolimnaea)的STR1菌株,可以通過(guò)調(diào)節(jié)植物耐鹽性的轉(zhuǎn)錄機(jī)制來(lái)保護(hù)小麥植物免受鹽脅迫;接種該菌株的小麥植株中各種抗氧化酶(如APX、MnSOD、CAT、POD、GPX和GR)的基因表達(dá)增強(qiáng),有助于提高對(duì)鹽脅迫的耐受性[19]。在鹽脅迫條件下,接種腸桿菌屬(Enterobacteriaceae)的菌株UPMR18的秋葵植物中觀察到抗氧化酶活性(SOD、APX和CAT)增加,可能是一種有效的生物資源,可增強(qiáng)鹽脅迫下秋葵植物的耐鹽性和生長(zhǎng)能力[20]。玉米接種葡萄球菌菌株SAT-17后,細(xì)胞抗氧化酶活性增加,并減輕了鹽誘導(dǎo)的細(xì)胞氧化損傷,促進(jìn)了玉米生長(zhǎng)[21]。這些研究表明,PGPR在激活抗氧化酶、調(diào)節(jié)植物生理生化過(guò)程中具有重要作用。

      3.2? 植物生長(zhǎng)調(diào)節(jié)劑

      PGPR能夠通過(guò)產(chǎn)生植物激素[赤霉素(GAs)、脫落酸(ABA)、吲哚-3-乙酸(IAA)]直接定殖根部,增強(qiáng)植物細(xì)胞分裂和植物吸收水分及礦物質(zhì)的能力,并刺激植物內(nèi)源激素的增加,從而促進(jìn)種子萌發(fā)、根系發(fā)達(dá)、植株生長(zhǎng)和對(duì)逆境的抵抗作用。

      PGPR在產(chǎn)生IAA中具有重要的促進(jìn)植物生長(zhǎng)的作用,這是由于它是調(diào)節(jié)植物發(fā)育的信號(hào)分子。細(xì)菌細(xì)胞與植物根系結(jié)合,以提高水分保持能力和防御系統(tǒng)對(duì)抗不同非生物脅迫的能力。研究報(bào)道,在鹽脅迫條件下,當(dāng)棉花接種產(chǎn)生IAA的芽孢桿菌(Bacillus)后,植物的發(fā)芽率、根長(zhǎng)、枝條長(zhǎng)度、葉綠素含量指數(shù)、相對(duì)含水量、葉面積、K+吸收和Na+的吸收增加[22]。節(jié)桿菌(Arthrobacter)菌株SA3在鹽分脅迫下增加了小麥的IAA含量,且幼苗中的DREB2轉(zhuǎn)錄因子的表達(dá)水平升高,以此賦予小麥在非生物脅迫下的耐受性[23]。研究表明,熒光假單胞菌(Pseudomonas fluorescens)是在鹽脅迫條件下維持ACC脫氨酶活性、鐵載體和IAA生產(chǎn)的最佳菌株,可以有效緩解鹽度對(duì)黃瓜生長(zhǎng)的負(fù)面影響[24]。在鹽脅迫下添加ACC導(dǎo)致乙烯信號(hào)正調(diào)節(jié)因子表達(dá)增加,抗氧化酶活性增強(qiáng),從而提高了植物耐鹽性,加速了植物生長(zhǎng)。根際細(xì)菌合成的細(xì)胞分裂素通過(guò)減少鉀濃度下降的程度,改善鹽脅迫下番茄的枝條生長(zhǎng)[25]。在缺水條件下,將產(chǎn)生細(xì)胞分裂素的枯草芽孢桿菌(Bacillus subtilis)接種到萵苣幼苗上會(huì)增加枝條生物量的積累并縮短根系,而對(duì)根系生物量的影響很小[26]。

      3.3? 滲透保護(hù)劑

      在應(yīng)對(duì)鹽脅迫時(shí),植物會(huì)積累有機(jī)滲透物,例如脯氨酸、甘氨酸、甜菜堿等以減輕對(duì)植物的傷害。具有固氮能力的耐鹽PGPR可以產(chǎn)生滲透物以保持鹽漬土壤中細(xì)胞的膨脹和新陳代謝[27]。Chen等發(fā)現(xiàn)Bacillus subtilis可以增強(qiáng)擬南芥中脯氨酸的合成[27-28]。鹽脅迫下,腸桿菌(Enterobacteriaceae)使擬南芥葉片中與脯氨酸合成相關(guān)基因P5CS1和P5CS2均表達(dá)上調(diào)[29]。此外,PGPR通過(guò)增加植物可溶性糖(TSS)含量抵御鹽脅迫。用Bacillus subtilis接菌小麥,不僅增加了脯氨酸的濃度,也增加了組織中可溶性糖的含量,兩者共同促成了植物的高耐鹽性[30]。接種芽孢桿菌(Bacillus)HL3RS14菌株的植物根干重和枝條長(zhǎng)度增加,且顯示出高濃度的脯氨酸、甘氨酸甜菜堿和丙二醛[31]。利用鳥(niǎo)槍法分析大豆組織中的蛋白質(zhì)組表明,在接種慢生根瘤菌后,鹽脅迫下應(yīng)激反應(yīng)蛋白如過(guò)氧化氫酶和谷胱甘肽S-轉(zhuǎn)移酶(抗氧化劑)、富含脯氨酸的前體蛋白(滲透劑)和NADP依賴(lài)性蘋(píng)果酸酶(與ABA信號(hào)傳導(dǎo)相關(guān))增加[32]。

      4? PGPR在不同作物中的應(yīng)用

      惡臭假單胞菌(Pseudomonas putida)[33]、解淀粉芽孢桿菌(Bacillus amyloliquefaciens)[19,27]、陰溝腸桿菌(Enterobacter cloacae)[34]、鏈霉菌(Streptomyces)[35]等對(duì)于在鹽脅迫下提高作物生產(chǎn)力有著至關(guān)重要的作用。Amna等人探究了暹羅芽孢桿菌(Bacillus siamensis)菌株P(guān)M13、芽孢桿菌屬(Bacillus)菌株P(guān)M15、甲基營(yíng)養(yǎng)芽孢桿菌(Bacillus methylotrophicus)菌株P(guān)M19在鹽脅迫下對(duì)小麥幼苗的影響,結(jié)果表明,PGPR施用對(duì)小麥幼苗的發(fā)芽率、根和莖長(zhǎng)、光合色素等具有非常積極的影響[36]。Yin等人從中國(guó)東營(yíng)鹽堿土中分離出一株新型PGPR菌株BY2G20,是一種變形芽孢桿菌(Metabacillus dongyingensis),可以提高鹽脅迫下玉米的耐受性[37]。Ali等人在玉米上接種陰溝腸桿菌(Enterobacter cloacae)菌株P(guān)M23,增強(qiáng)了其自由基清除能力、相對(duì)水含量、可溶性糖、蛋白質(zhì)、總酚和類(lèi)黃酮含量[38]。Abdel等在油菜根際分離出2種PGPR菌株:褐色球形固氮菌(Azotobacter chroococcum)和糞產(chǎn)堿菌(Alcaligenes faecalis),二者共接種增強(qiáng)了鹽脅迫下植物的生長(zhǎng)參數(shù)和光合色素,提出共接種可能是解決鹽漬化的優(yōu)質(zhì)方法[39]。Khare等人評(píng)估了熒光假單胞菌(Pseudomonas fluorescens)的EKi菌株在鹽脅迫下產(chǎn)生生物防治和促進(jìn)植物生長(zhǎng)代謝物的能力,表明鹽脅迫下EKi菌株促進(jìn)鷹嘴豆的生長(zhǎng)并抑制炭腐病[40]。Sapre等從小麥植物的根際分離出耐鹽PGPR菌株IG3,發(fā)現(xiàn)接種IG3菌株可增強(qiáng)鹽脅迫條件下的植物生長(zhǎng)[41]。利用全基因組測(cè)序也可分離鑒定PGPR。Liu等對(duì)克雷伯氏菌(Klebsiella)的D5A菌株的基因組進(jìn)行鑒定,揭示了耐鹽基因的存在。這些基因具有廣泛的pH適應(yīng)性和PGP性狀,包括磷酸鹽溶解、IAA生物合成等[42]。事實(shí)上,功能宏基因組學(xué)為鑒定微生物耐鹽性的各種基因提供了一種極好的方法。

      5? 結(jié)論

      在PGPR的長(zhǎng)期進(jìn)化下,植物已發(fā)展出各種機(jī)制應(yīng)對(duì)鹽脅迫,除了上述所提到的機(jī)制外,還有調(diào)控ACC脫氨酶的活性,產(chǎn)生胞外多糖(EPS)、調(diào)節(jié)Na+和K+等離子平衡等。在鹽脅迫下,一些基因或代謝物會(huì)參與維持細(xì)胞完整性和植物與微生物間的相互作用。在對(duì)植物產(chǎn)生鹽分壓力時(shí),PGPR可以通過(guò)相應(yīng)途徑提高植物的耐鹽性,但對(duì)于PGPR是通過(guò)何種通道或途徑感受到植物處于高鹽環(huán)境下的生理生化現(xiàn)象還有待探索。此外,PGPR在修復(fù)和提高鹽脅迫條件下農(nóng)業(yè)生態(tài)系統(tǒng)的生產(chǎn)力方面具有積極作用,但對(duì)于PGPR的基因和功能還有待深入研究,以為將來(lái)利用PGPR實(shí)現(xiàn)鹽漬土復(fù)墾提供依據(jù)。

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