CN113826626B - 油菜素内酯缓解三七农药胁迫及降低农残的方法 - Google Patents

油菜素内酯缓解三七农药胁迫及降低农残的方法 Download PDF

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CN113826626B
CN113826626B CN202111298958.XA CN202111298958A CN113826626B CN 113826626 B CN113826626 B CN 113826626B CN 202111298958 A CN202111298958 A CN 202111298958A CN 113826626 B CN113826626 B CN 113826626B
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郑凯
杨野
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Abstract

本发明公开了一种油菜素内酯缓解三七农药胁迫及降低农残的方法,其是在三七喷施农药前,先向三七叶面喷施0.02μmol/L~1μmol/L的油菜素内酯溶液,以叶面喷湿,但不形成水滴滑落为标准;该方法实施结果表明油菜素内酯能够显著提高农药胁迫下三七叶片抗氧化酶活性和渗透调节物质含量,降低丙二醛、相对电导率、活性氧含量,提高光合作用,保障三七主要药效成分,并降低农药残留量,本发明方法成本较低、操作简便,对推动我国三七产业的可持续发展具有重要意义。

Description

油菜素内酯缓解三七农药胁迫及降低农残的方法
技术领域
本发明属于三七种植及农药残留处理技术领域,具体涉及油菜素内酯在缓解三七农药胁迫降低及农药残留中的应用。
背景技术
三七从种植到采收至少需要3年时间,生产中通常采用搭建遮阴棚的方式营造阴生环境,期间极易感染真菌、细菌和线虫等多种病虫害,主要通过施用农药的方式来控制病虫害,但三七中的登记农药数较少,生产中农户往往根据自身经验喷施农药。农药的过量使用加上不科学的施用方式会对三七本身造成胁迫作用,影响三七药效,其农药残留问题也日渐显著,过多的农药残留量会对食用者造成安全隐患,是影响三七质量安全,也是限制三七产业发展和出口的主要因素。
油菜素内酯被认为是具有调控植物生长发育作用的第六大类植物内源激素,作为一种类固醇类植物激素,可与其他植物激素协同作用参与植物的生长发育,目前,油菜素内酯在缓解三七农药胁迫以及降低三七中农药残留的应用尚无报道。
因此,生产中迫切需要一种经济高效的方法来缓解三七中的农药胁迫现象,保障药效,降低农药残留量。
发明内容
为解决上述问题,本发明提供了一种利用油菜素内酯来缓解三七农药胁迫保障三七药效及降低农药残留的方法,本发明方法是在三七喷施农药前,先向三七叶面喷施0.02μmol/L~1μmol/L的油菜素内酯,以叶面喷湿,但不形成水滴滑落为标准。
为了实现本发明的上述目的,本发明的技术方案如下:
(1)配制0.02μmol/L~1μmol/L的油菜素内酯溶液;
(2)选取生长健康且长势一致的3年生三七,采用0.02μmol/L~1μmol/L的油菜素内酯水溶液喷施叶面以叶面喷湿,但不形成水滴滑落为标准;
(3)喷施24h后,三七叶面喷施2.4 ml/L的丙环唑溶液,喷施农药5天后通过检测三七叶片的抗逆性相关指标(0.1μmol/L油菜素内酯处理)和农药残留量,来评估油菜素内酯缓解农药胁迫和降低农药残留的能力;所述指标包括叶片内的超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、丙二醛(MDA)、相对电导率、活性氧(超氧阴离子,过氧化氢)含量、光合指标(叶绿素含量,最大光化学效率(Fv/Fm))、渗透调节物质(可溶性糖,可溶性蛋白)含量和三七总皂苷含量。
本发明使用油菜素内酯喷施三七,能显著减少丙环唑在三七中的农药残留,提高了三七叶片中的SOD、POD、CAT值,农药胁迫后三七叶片中相对电导率、MDA、超氧阴离子和过氧化氢含量均显著上升,油菜素内酯能显著减少三七叶片中相对电导率、MDA、超氧阴离子和过氧化氢含量的积累,保护叶片结构,缓解农药胁迫对三七光合作用的抑制,缓解农药胁迫对三七光合作用的抑制,最终达到保护三七药效、降低农残的目的。本发明方法中使用的油菜素内酯是天然植物激素,不会对环境、作物和人类产生危害;且使用方法简单、有效,在农业生产上有广阔的应用前景。
附图说明
图1为不同浓度油菜素内酯对三七叶片丙环唑残留的影响;
图2为油菜素内酯对农药胁迫下三七叶片超氧化物歧化酶(SOD)检测结果;
图3为油菜素内酯对农药胁迫下三七叶片过氧化物酶(POD)检测结果;
图4为油菜素内酯对农药胁迫下三七叶片过氧化氢酶(CAT)检测结果;
图5为油菜素内酯对农药胁迫下三七叶片中丙二醛(MDA)检测结果;
图6为油菜素内酯对农药胁迫下三七叶片中过氧化氢检测结果;
图7为油菜素内酯对农药胁迫下三七叶片中超氧阴离子检测结果;
图8为油菜素内酯对农药胁迫下三七叶片中相对电导率检测结果
图9为油菜素内酯对农药胁迫下三七叶片中叶绿素含量检测结果;
图10为三七叶片最大光化合效率检测结果;
图11为三七叶片中可溶性糖检测结果;
图12为三七叶片中可溶性蛋白检测结果;
图13为油菜素内酯对农药胁迫下三七总皂苷的影响结果;
图中:PRO是丙环唑,BR是油菜素内酯。
具体实施方式
下面结合附图和具体实施例对本发明做进一步详细说明,但本发明保护范围不局限于所述内容。实施例中方法如无特殊说明,按常规操作进行,如无特殊说明使用试剂均为常规市购试剂或按常规方法配制的试剂。
实施例1:油菜素内酯在缓解三七农药胁迫及降低农残中的应用
(1)选取长势一致生长状况良好的3年生三七,随机分为对照组和处理组,并移栽至没有农药使用背景的土壤中,培养一周;
(2)将油菜素内酯粉末用无水乙醇溶解,再用纯净水稀释成0μmol/L、0.02μmol/L、0.1μmol/L、0.5μmol/L和1μmol/L油菜素内酯溶液,然后喷施于三七叶片,以喷湿叶面,但不形成水滴滑落为标准;
(3)喷施油菜素内酯24h后,叶面喷施2.4mL/L的丙环唑溶液,以喷湿叶面,但不形成水滴滑落为标准;
(4)喷施农药5天后,采集三七叶片,用去离子水清洗,放置于60℃烘箱干燥3天后,研钵粉碎后过40目筛制得三七干样;
丙环唑含量检测;准确称取1g(精确至0.0001g)三七干样于50mL聚丙烯离心管中,加入10mL水,摇匀后浸泡15min,再加入10mL乙腈,涡旋振荡1min,最后加入4g无水MgSO4和1g NaCl,涡旋振荡1min,于3500r/min离心10min;精密移取2mL有机层溶液至15mL聚丙烯离心管中,加入50mg PSA(乙二胺-N-丙基硅烷)、200mg无水MgSO4和15mg石墨化炭黑,涡旋振荡1min,于3500r/min离心5min,精密移取1mL上清液于5mL离心管中,于40℃氮吹仪上吹干,残渣加入1mL甲醇复溶,过0.22μm微孔滤膜,转移至进样小瓶,丙环唑标准品做同样处理,用LC-MS/MS检测,结果见图1,从图中可以看出油菜素内酯溶液能显著减少丙环唑在三七中的农药残留,且0.1μmol/L效果最佳。
实施例2:三七抗氧化酶活性相关指标的测定
1、粗酶液提取
取鲜样三七叶片0.2g于预冷的研钵中,分三次加入1.5mL的50mmol/L预冷的磷酸缓冲液(pH7.8),在冰上研磨成匀浆状,迅速移至离心管中4℃、12000g下离心20min,上清液为粗酶提取液;
2、SOD活性测定
反应液的配置:取14.5mmol/L甲硫氨酸溶液2.7mL、3mmol/L EDTA-Na2溶液0.1mL、2.25mmol/L氮蓝四唑溶液0.1mL、6mmol/L核黄素溶液0.1mL混合摇匀;
取40μL酶液加入3mL反应液中混合后充分摇匀不遮光,以3mL反应液加40μL磷酸缓冲液(pH7.8,0.05M)不遮光作为最大光还原管,以3mL反应液加40μL磷酸缓冲液(pH7.8,0.05M)同时用锡箱纸包好遮光用于测定时调零。将试管置于光照培养箱中在4000lux光照、25℃下反应20min,测定各管在560nm下的吸光度;
SOD酶活性=[(ODck-ODe)×V]/(1/2ODck×W×Vt)]
SOD酶活性(U/g FW);ODck为光照对照管的吸光度;ODe为样品管的吸光度;V为样品液总体积(mL);Vt为测定时的酶液用量(mL);W为样品鲜重(g)。
结果见图2,结果表明油菜素内酯显著提高了农药胁迫下三七叶片的SOD值。
3、POD活性测定:
反应液的配置:取50mL磷酸缓冲液(pH6、0.2M)加入28μL愈创木酚于磁力揽拌器上加热揽拌,待溶液溶解冷却后加入19μL质量浓度30%的过氧化氢;
取40μL酶液加入3mL反应液中混合后充分摇匀,以磷酸缓冲液(pH7.8、0.05M)为对照调零,迅速测定470nm下混合液40s内的吸光值变化。
POD酶活性=(ΔOD470×Vt)/(×W×Vs×0.01×t)
POD酶活性(U/g FW);ΔOD470为反应时间内吸光度的变化;t为反应时间;Vt为提取酶液总体积(mL);Vs为测定时的酶液用量(mL);W为样品鲜重(g)。
结果见图3,表明油菜素内酯显著提高了农药胁迫下三七叶片的POD值。
4、CAT活性测定
反应液的配置:取100mL磷酸缓冲液(pH7、0.15M)加入0.1546mL质量浓度30%的过氧化氢。
取0.1mL酶液加入2.9mL反应液中混合后充分摇匀,以磷酸缓冲液(pH7.8、0.05M)为对照调零,迅速测定240nm下混合液40s内的吸光值变化。
CAT酶活性=(ΔOD240×Vt)/(×W×Vs×0.01×t)
CAT酶活性(U/g FW);ΔOD240为反应时间内吸光度的变化;t为反应时间;Vt为提取酶液总体积(mL);Vs为测定时的酶液用量(mL);W为样品鲜重(g)。
结果见图4,结果表明油菜素内酯显著提高了农药胁迫下三七叶片的CAT值。
实施例3:油菜素内酯对农药胁迫下三七叶片膜脂过氧化和破环程度检测实验
1、MDA的测定
喷施农药5天后,采集三七叶片用去离子水清洗,三七叶片液氮冷冻后放于-80℃冰箱制备三七叶片鲜样;取三七鲜样1g,加入10mL体积浓度10%的三氯乙酸充分研磨,匀浆液以4000g离心10min,取2mL提取液,加入2mL、6g/L的硫代巴比妥酸(用体积浓度10%的三氯乙酸配置),沸水浴中煮沸15min,迅速冷却,离心;上清液在532nm和450nm下测定吸光值;对照管以2mL水代替提取液;
Cb=6.45×A532-0.56×A450
Cb为MDA含量,单位是μmol/L;
结果见图5,从图中可以看出油菜素内酯显著降低了农药胁迫下三七叶片中的MDA含量。
2、过氧化氢含量的测定
采用二甲酚橙法,取2g三七鲜样,用2mL丙酮充分研磨,10000g离心10min,取1mL上清液,加入3mL萃取剂(CCl2:CHCl3=3:1)、5mL蒸馏水,混匀,5000g离心1min,取1mL上层水相加入试剂1(含有3.3mmol/L FeSO4、3.3mmol/L(NH4)2SO4、412.5 mmol/L H2SO4的水溶液):试剂2(含有165μmol/L二甲酚橙、165μmol/L山梨醇的水溶液)的体积比为1:2的混合试剂2mL,30℃水浴显色30min后在560nm处测吸光值,以吸光值为纵坐标,过氧化氢浓度为横坐标,在以不同浓度过氧化氢制成的标准曲线上,获取样品中的过氧化氢浓度,标准曲线:y=0.0048x+0.0574,R²=0.9987,结果见图6,从图中可以看出油菜素内酯显著降低了农药胁迫下三七叶片中的过氧化氢含量。
3、超氧阴离子的测定
采用羟胺法,取2g三七鲜样用50nmol/L、pH为7.8的磷酸缓冲液充分研磨,10000g下离心20min,取0.5上清液相加入0.5mL磷酸缓冲液、1.5mL的1mmol/L盐酸羟胺,25℃放置1h,再加入2mL 17mmol/L对氨基苯磺酸和2mL 7mmol/L的α萘胺,25℃下放置20min后,在530nm处测吸光值,以吸光值为纵坐标,亚硝酸根浓度为横坐标,以不同浓度亚硝酸根制成的标准曲线上查到样品中的超氧阴离子浓度,标准曲线:y=0.0089x-0.0498,R²=0.9994,注意超氧阴离子的摩尔数是亚硝酸根的两倍;结果见图7,从图中可以看出油菜素内酯显著降低了农药胁迫下三七叶片中的超氧阴离子含量。
4、相对电导率的测定
喷施农药5天后,采集三七叶片用去离子水清洗,称取0.1g置于10mL去离子水中浸泡12h,用电导仪测定电导R1,然后沸水加热30min,冷却后测定电导R2,相对电导率=R1/B2×100%,结果见图8,从图中可以看出菜素内酯显著降低了农药胁迫下三七叶片中的相对电导率;
以上结果表明农药胁迫后三七叶片相对电导率、MDA、超氧阴离子和过氧化氢含量均显著上升,油菜素内酯能显著减少三七叶片相对电导率、MDA、超氧阴离子和过氧化氢含量的积累,保护叶片结构。
实施例4:油菜素内酯对农药胁迫下三七叶片光合作用的检测
叶绿素含量采用丙酮提取法,喷施农药5天后,采集三七叶片用去离子水清洗,三七叶片液氮冷冻后放于-80℃冰箱制备三七叶片鲜样;取0.5g三七鲜样用3mL丙酮充分研磨,再加入7mL 80%的丙酮,4000g下离心10min,取0.5mL上清液加入4mL 80%丙酮,分别在663nm、645nm处测定吸光值。
CT=8.02×A663+20.21×A645
CT为叶绿素浓度,单位是mg/L;
叶绿素荧光采用连续激发式荧光仪测定,图9、10表明农药胁迫后三七叶片叶绿素含量和最大光化学效率(Fv/Fm)均受到抑制,油菜素内酯能显著缓解农药胁迫对三七光合作用的抑制。
实施例5:油菜素内酯对农药胁迫下三七叶片渗透调节物质检测
1、采用蒽酮比色法检测三七叶片中的可溶性糖,喷施农药5天后,采集三七叶片,用去离子水清洗,三七叶片和主根放置于60℃烘箱干燥3天后,研钵粉碎后过40目筛制得三七干样,取50mg三七干样,磨碎成粉加入4mL 80%乙醇,置于80℃水浴中搅拌40min,离心取上清,残渣加2mL 80%乙醇重复提2次,合并上清液,在上清液中加10mg活性炭,80℃脱色30min,80%乙醇定容至10mL,13500g离心10min,取1mL上清,加入5mL蒽酮试剂[称取1g蒽酮溶于1000mL稀硫酸溶液(760mL相对密度为1.84的浓硫酸用蒸馏水稀释成1000 mL)中,置于棕色瓶中,当日配置使用],在625nm处测定吸光值,以吸光值为纵坐标,葡萄糖浓度为横坐标,在绘制的标准曲线上查到样品中的葡萄糖浓度;标准曲线:y=384.87x-27.168,R²=0.9997;结果见图11;从图中可以看出农药胁迫会导致可溶性糖的积累,菜素内酯加剧了这种积累,增强细胞代谢水平。
2、采用考马斯亮蓝染色法测定可溶性蛋白,喷施农药5天后,采集三七叶片用去离子水清洗,三七叶片液氮冷冻后放于-80℃冰箱制备三七叶片鲜样;称取0.2g三七鲜样置于预冷的研钵中,加入1.5mL、50mmol/L预冷的磷酸缓冲液(pH=7.8)在冰浴上研磨成匀浆,转入离心管中4℃、12000r/min离心20 min,取上清液提2mL,加入染料试剂2mL考马斯亮蓝G-250(称取60mg考马斯亮蓝G-250溶于100mL 3%过滤酸溶液中),立即混匀,测定595nm处吸光值,以吸光值为纵坐标,蛋白质浓度为横坐标,在绘制的标准曲线上查到样品中的可溶性蛋白浓度,标准曲线:y=0.0046x+0.1891,R²=0.9994;结果见图12;从图中可以看出农药胁迫会导致可溶性蛋白的积累,菜素内酯加剧了这种积累,增强细胞代谢水平。
上述结果表明农药胁迫后三七叶片渗透调节物质积累,油菜素内酯能进一步促进渗透调节物质的积累,降低细胞渗透势。
实施例6:三七主根皂苷含量的测定
将三七主根样品烘干至恒重后,研磨过50目筛,取0.3g粉末,加25mL、70%甲醇浸提过夜,超声40min,3000r/min离心10min,上清液过0.4μm滤孔,取1mL滤液进行HPLC检测;结果见图13表明农药胁迫后三七主根中的总皂苷含量降低影响三七药效,油菜素内酯能缓解农药胁迫,增加三七皂苷含量,从而保障三七药效。
综上所述,油菜素内酯能显著缓解三七中的农药胁迫,并降低三七中的农药残留,喷施0.1μmol/L的油菜素内酯去农药残留效果最佳。
虽然本申请所揭露的实施方式如上,但所述的内容仅为便于理解本申请而采用的实施方式,并非用以限定本申请。任何本申请所属领域内的技术员,在不脱离本申请所揭露的精神和范围的前提下,可以在实施的形式及细节上进行任何的修改与变化,但本申请的专利保护范围,仍须以所附的权利要求书所界定的范围为准。

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1.一种油菜素内酯缓解丙环唑对三七的胁迫及降低丙环唑在三七中农药残留的方法,其特征在于:在三七喷施丙环唑农药前,先向三七叶面喷施0.02mmol/L~1 mmol/L的油菜素内酯溶液,以叶面喷湿,但不形成水滴滑落为标准。
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