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基于葉綠素?zé)晒鈪?shù)評(píng)估蝴蝶蘭的組織培養(yǎng)潛力

2022-06-01 12:43朱珈葉李丹丹陳倩印麗萍郭水良
關(guān)鍵詞:莖段組織培養(yǎng)蝴蝶蘭

朱珈葉 李丹丹  陳倩 印麗萍 郭水良

摘? 要: 以蝴蝶蘭( RcHb.F.)的“大辣椒”品種為對(duì)象,研究了不同高溫脅迫處理時(shí)間下的蝴蝶蘭形態(tài)、葉綠素?zé)晒鈪?shù)變化,并對(duì)處理過(guò)的蝴蝶蘭材料進(jìn)行了組織培養(yǎng).結(jié)果發(fā)現(xiàn):當(dāng)蝴蝶蘭“大辣椒”品種莖段的PSⅡ最大光化學(xué)量子產(chǎn)量(/)低于0.35時(shí),其無(wú)法作為外植體進(jìn)行組織培養(yǎng).與蝴蝶蘭葉片相比,莖段的/更能夠指示蝴蝶蘭組織培養(yǎng)的成功概率.

關(guān)鍵詞: 蝴蝶蘭; 莖段; 葉片; PSⅡ最大光化學(xué)量子產(chǎn)量(/); 組織培養(yǎng)

中圖分類(lèi)號(hào): Q 945??? 文獻(xiàn)標(biāo)志碼: A??? 文章編號(hào): 1000-5137(2022)02-0251-06

Potential evaluation of tissue culture for by using chlorophyll fluorescence parameters

ZHU JiayeLI DandanCHEN QianYIN LipingGUO Shuiliang

(1.College of Life Sciences, Shanghai Normal University, Shanghai 200234, China;2.Shanghai Entry-Exit Inspection and Quarantine Bureau, Shanghai 200315, China)

“Dalajiao” is a common variety of The individuals of the variety were cultured at a high temperature of 35 ℃, 14 h light/d with different durations. Throughout the treatment, their morphological changes were observed and the chlorophyll fluorescence parameters including the maximum quantum efficiency of photosystem II (PSⅡ) photochemistry(/), electron transfer rate under different light intensities were determined. Their corresponding explants were cultured to evaluate the potential for successful reproduction . We found that there existed a positive correlation between / of the stems and the successful rate of tissue culture with corresponding stems. When / of stems was less than or equal to 0.35, the stems were unable to be cultured because of lacking vitality. The / of the stems is better than that of the leaves in indicating their potential as explants for tissue culture.

; stem; leaf; photosystem Ⅱ (PSⅡ) photochemistry(/); tissue culture

蝴蝶蘭( RcHb.F.)是蘭科附生單莖性植物.由于其形態(tài)和結(jié)構(gòu)上均與眾不同,且外形具有娥蝶般的美麗,故以蝴蝶蘭來(lái)命名.蝴蝶蘭為多年生常綠草本,是熱帶/亞熱帶氣生蘭.中國(guó)云南南部、西藏南部、廣東南部、海南及臺(tái)灣為該屬植物的自然分布的北界.蝴蝶蘭在國(guó)內(nèi)外鮮花市場(chǎng)上深受歡迎,具有很高的觀賞價(jià)值和經(jīng)濟(jì)價(jià)值.

隨著蘭花種植業(yè)的發(fā)展,蝴蝶蘭的組織培養(yǎng)發(fā)展迅速.早在1949年,人們利用蝴蝶蘭花梗腋芽成功地進(jìn)行了組織培養(yǎng),正式提出了一種蝴蝶蘭屬植物營(yíng)養(yǎng)繁殖的方法,實(shí)現(xiàn)了蝴蝶蘭試管繁殖.蝴蝶蘭的莖尖、莖段和幼葉、花梗腋芽、花梗節(jié)間、根尖等部位都可做離體組織培養(yǎng)的外植體.但是葉片的誘導(dǎo)成功率很低.蝴蝶蘭不同外植體的成活率有差異,其中花梗側(cè)芽的成活率最高,達(dá)75.0%,其次為花梗,成活率為62.5%,葉片和根尖最差,分別為12.5%和7.5%.

蝴蝶蘭組培的基本培養(yǎng)基包括Murashige and Skoog (MS)培養(yǎng)基,1/2 MS培養(yǎng)基,Vacin and Went (VW)蘭科植物培養(yǎng)基,Gamborg’s B-5培養(yǎng)基,Knudson C (KC)培養(yǎng)基,Kyoto so1ution花肥培養(yǎng)基,花寶及其改良型等.但不同品種的蝴蝶蘭以及取用不同部位的外植體,最適培養(yǎng)基的選擇也有所不同.1/2MS或改良MS較MS效果好,減少M(fèi)S中大量元素和部分微量元素及有機(jī)成分,適當(dāng)增加少量的葉酸,有利于原球莖的增殖生長(zhǎng).植物組織培養(yǎng)中常添加一些天然有機(jī)物.如椰子汁、馬鈴薯汁和香蕉汁可提高蝴蝶蘭原球莖的增殖率.蝴蝶蘭組培中常用的細(xì)胞分裂素為6-BA,質(zhì)量濃度較高(1~8 mg?L)的6-BA能促進(jìn)蝴蝶蘭原球莖增殖,質(zhì)量濃度較低(0.1~0.5 mg?L)的6-BA能促進(jìn)原球莖分化.

蝴蝶蘭在生長(zhǎng)發(fā)育期對(duì)高溫敏感,在高溫脅迫下極易受到抑制和危害.其最適宜生長(zhǎng)的溫度是18~28 ℃.溫度過(guò)高會(huì)導(dǎo)致蝴蝶蘭細(xì)胞內(nèi)活性氧(ROS)大量積累,使其代謝紊亂,從而導(dǎo)致植株生長(zhǎng)緩慢甚至死亡.恒溫30 ℃處理24 h能顯著提高蝴蝶蘭抗氧化酶活性,然而40 ℃處理會(huì)破壞抗氧化酶系統(tǒng).關(guān)于蝴蝶蘭高溫脅迫方面的研究,主要集中在赤霉素、細(xì)胞分裂素與成花的關(guān)系,高溫脅迫下蝴蝶蘭的防御機(jī)制和傷害機(jī)理,蝴蝶蘭的高溫脫毒,以及耐熱性的誘導(dǎo)及抗熱害栽培等方面.

隨著中國(guó)對(duì)外交流的擴(kuò)大,園藝植物進(jìn)出口頻繁.目前國(guó)內(nèi)外對(duì)蝴蝶蘭的研究主要集中在組織快速繁殖體系的建立、滅菌方法、降低褐化,及對(duì)脅迫的生理響應(yīng)等方面,但很少有關(guān)于環(huán)境脅迫對(duì)蝴蝶蘭可組培性影響的研究.蝴蝶蘭作為蘭科珍貴的園藝種源,為防止其種源流失,同時(shí)也為利用境外蝴蝶蘭種源,建立對(duì)蝴蝶蘭植株活力的快速檢測(cè)方法,具有實(shí)際應(yīng)用價(jià)值.本研究分別以蝴蝶蘭無(wú)菌試管苗為材料,研究了高溫脅迫條件下蝴蝶蘭的葉綠素?zé)晒鈪?shù)變化,及其與蝴蝶蘭生長(zhǎng)繁殖潛力之間的關(guān)系,旨在建立蝴蝶蘭植株活力的快速檢測(cè)方法.

1? 材料與方法

培養(yǎng)材料為蝴蝶蘭“大辣椒”品種3個(gè)月組培苗,購(gòu)自濰坊市濰城區(qū)南關(guān)花卉市場(chǎng).

選取株齡、株高、生勢(shì)、葉色基本一致的3個(gè)月齡的蝴蝶蘭“大辣椒”組培苗植株,放置在無(wú)菌瓶中,每瓶一株,于光照培養(yǎng)箱中培養(yǎng).培養(yǎng)條件為:溫度35 ℃,光照12 h·d,空氣相對(duì)濕度70% RH,光照強(qiáng)度2 000 lx.對(duì)照的溫度為(25±2)℃,光照12 h·d.

每隔2 d取出高溫處理的蝴蝶蘭幼苗植株,暗適應(yīng)20 min后,采用便攜式調(diào)制葉綠素?zé)晒鈨xPAM,分別測(cè)定蝴蝶蘭兩個(gè)品種莖段和第二片葉的PSⅡ最大光化學(xué)量子產(chǎn)量(/).每個(gè)處理重復(fù)3次.同樣每隔2 d取出高溫處理的蝴蝶蘭幼苗植株進(jìn)行可組培性研究,切去根部和葉子,保留莖段部位進(jìn)行組培.

接種培養(yǎng)基為:花寶1號(hào)(質(zhì)量濃度3 g?L)+6-BA(質(zhì)量濃度5.0 mg?L)+NAA(質(zhì)量濃度0.5 mg?L)+蔗糖(質(zhì)量濃度30 g?L)+椰汁(體積分?jǐn)?shù)200 mL?L)+瓊脂(質(zhì)量濃度6 g?L)+活性炭(質(zhì)量濃度1 g?L)+pH值6.0.接種后的莖段放置在無(wú)菌培養(yǎng)室中培養(yǎng),培養(yǎng)條件為(25±2)℃,光源為普通熒光燈,光照度約1 500~2 000 lx,光照時(shí)間為12 h?d.每個(gè)處理設(shè)5次重復(fù).培養(yǎng)75 d后觀測(cè)蝴蝶蘭成苗情況,以形成葉片、叢生芽為組培成功標(biāo)準(zhǔn).

2? 結(jié)果與分析

高溫脅迫下蝴蝶蘭“大辣椒”品種的形態(tài)變化

對(duì)照處理的蝴蝶蘭植株,在實(shí)驗(yàn)期間均保持良好生長(zhǎng)狀態(tài).高溫處理下,“大辣椒”品種在第10天開(kāi)始變黃,第22天大部分發(fā)黃枯萎(圖1).

高溫脅迫下蝴蝶蘭“大辣椒”品種葉片和莖段/

高溫脅迫下,隨著處理時(shí)間的延長(zhǎng),蝴蝶蘭的葉片/值不斷下降,第21天后,該指標(biāo)急劇下降,到第24天時(shí)為0.與葉片相比,莖段的/值下降的相對(duì)平緩,到第24天時(shí)/值為0.35.

高溫脅迫處理下,隨著處理時(shí)間的延長(zhǎng),蝴蝶蘭莖段/值整體呈不斷下降的趨勢(shì),處理20 d后,/值為0.35,仍有一定活力.高溫脅迫下,莖段的最大量子產(chǎn)量下降程度弱于葉片(圖2).

測(cè)定不同波長(zhǎng)的光合有效輻射(PAR)下蝴蝶蘭的光合電子傳遞速率(ETR),得到快速光響應(yīng)曲線.發(fā)現(xiàn)在高溫脅迫處理下,隨著處理時(shí)間的延長(zhǎng),快速光響應(yīng)曲線整體呈不斷下降的趨勢(shì),第22天時(shí)光響應(yīng)曲線降到最低,但是仍然有一定活性,整體趨勢(shì)與高溫脅迫下“大辣椒”莖段/值的變化趨勢(shì)一致(圖3).

高溫脅迫下兩種蝴蝶品種葉片/值與可組培相關(guān)性

蝴蝶蘭“大辣椒”品種在高溫脅迫環(huán)境下14 d后,外植體組培成功率都為100%;第16天時(shí),組培成功率降到了67%;第22天時(shí)為33%;第24天以后為0.與“黃花紅心”品種相比,“大辣椒”品種在高溫脅迫下不管是/值變化,還是外植體的組培可繁育能力,相應(yīng)指標(biāo)下降的速率都更為緩慢.

高溫脅迫環(huán)境下蝴蝶蘭幼苗的可組培性與其葉片的/值正相關(guān).由于測(cè)量/值的部位為葉片,進(jìn)行可組培性探究的部位為莖段,莖段可組培性與其葉片的F/值對(duì)應(yīng)性不是很強(qiáng).

在高溫處理12 d后,“大辣椒”品種莖段的/值大于0.5,組培成功率都在80%以上;/值低于0.5以后,可組培成功率依次遞減;當(dāng)/值小于0.35時(shí),組培成功率均為0.由于組培部分用的是切掉根部和葉子的蝴蝶蘭莖段作外植體,高溫脅迫下蝴蝶蘭莖段的v/值與可組培相關(guān)性更為直接.蝴蝶蘭莖段是組培性探究的實(shí)驗(yàn)材料,直接測(cè)量莖段的葉綠素?zé)晒鈪?shù),特別是/值,能夠很好地指示蝴蝶蘭的可組織培養(yǎng)成功率(表1).

3? 討論

高溫脅迫下,蝴蝶蘭幼苗PSⅡ反應(yīng)中心出現(xiàn)了可逆或不可逆失活,降低了原初光能轉(zhuǎn)換效率,對(duì)光合機(jī)構(gòu)和光合色素產(chǎn)生光氧化破壞.不同的蝴蝶蘭品種對(duì)高溫脅迫處理的耐受性不同,由于“大辣椒”品種的葉片比較肥厚,蘊(yùn)藏水分比較多,在高溫脅迫下的耐受力比其他品種更強(qiáng).今后將在更多的蝴蝶蘭品種中開(kāi)展實(shí)驗(yàn)研究,以評(píng)估不同品種對(duì)高溫脅迫的耐受力.

隨著高溫脅迫處理時(shí)間的延長(zhǎng),蝴蝶蘭莖段/值整體也呈不斷下降的趨勢(shì),與高溫處理蝴蝶蘭葉片相比,莖段的/值變化較緩,而且其與蝴蝶蘭的組培成功率之間的相關(guān)性更加緊密和直接.高溫處理20 d后,蝴蝶蘭“大辣椒”莖段的/值下降為0.35,此種情況下莖段已經(jīng)失去進(jìn)行擴(kuò)繁的活力.因此,蝴蝶蘭莖段/值0.35可以作為一個(gè)判別莖段是否能夠成為外植體進(jìn)行組培擴(kuò)繁的閾值.研究蝴蝶蘭幼苗在高溫脅迫環(huán)境下的葉綠素?zé)晒鈪?shù)的變化與其可組培性的關(guān)系,不僅可以為蝴蝶蘭規(guī)?;a(chǎn)提供實(shí)質(zhì)性的參考建議,更能為海關(guān)檢驗(yàn)檢疫局管控蝴蝶蘭出入境情況提供幫助.

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(責(zé)任編輯:顧浩然)

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