农业环境科学学报
農業環境科學學報
농업배경과학학보
Journal of Agro-Environment Science
2015年
7期
1247-1253
,共7页
马彦霞%张玉鑫%胡琳莉%吕剑%郁继华%王晓巍
馬彥霞%張玉鑫%鬍琳莉%呂劍%鬱繼華%王曉巍
마언하%장옥흠%호림리%려검%욱계화%왕효외
番茄%基质浸提液%抗坏血酸(AsA)%自毒作用%种子萌发%超微结构
番茄%基質浸提液%抗壞血痠(AsA)%自毒作用%種子萌髮%超微結構
번가%기질침제액%항배혈산(AsA)%자독작용%충자맹발%초미결구
Lycopersicon esculentum%substrate extracts%ascorbic acid%autotoxicity%germination%ultra-microstructure
为探究外源抗坏血酸(AsA)提高自毒作用下番茄抗逆能力的内在机制,以优良番茄品种“粉冠一号”为材料,用连作3 a番茄的基质浸提液处理种子及幼苗,研究了不同浓度(0、0.25、0.5、1 mmol·L-1)AsA对自毒作用下番茄种子发芽率、发芽势、发芽指数和幼苗主根、上胚轴长、抗氧化酶(SOD、POD、APX)活性、抗氧化剂(AsA、GSH)含量、MDA含量和电解质渗漏率及根系超微结构的影响。结果表明:单一基质浸提液处理可抑制番茄种子的萌发和幼苗生长,降低SOD、POD和APX酶活性及GSH和AsA含量, MDA含量和电解质渗漏率升高;当用含有不同浓度AsA的基质浸提液处理后,与单一基质浸提液处理相比,番茄种子的发芽率、发芽势和发芽指数均增大,幼苗主根和上胚轴的生长加快,植株的抗氧化酶活性和抗氧化剂含量升高,MDA含量和电解质渗漏率均降低,对幼苗根系结构的不良影响减少。外源AsA能维持番茄幼苗正常的生理功能,有效缓解连茬基质浸提液对其造成的自毒胁迫。所有处理各指标的综合隶属函数值分析表明,1 mmol·L-1的AsA缓解效果最好,0.5 mmol·L-1次之。
為探究外源抗壞血痠(AsA)提高自毒作用下番茄抗逆能力的內在機製,以優良番茄品種“粉冠一號”為材料,用連作3 a番茄的基質浸提液處理種子及幼苗,研究瞭不同濃度(0、0.25、0.5、1 mmol·L-1)AsA對自毒作用下番茄種子髮芽率、髮芽勢、髮芽指數和幼苗主根、上胚軸長、抗氧化酶(SOD、POD、APX)活性、抗氧化劑(AsA、GSH)含量、MDA含量和電解質滲漏率及根繫超微結構的影響。結果錶明:單一基質浸提液處理可抑製番茄種子的萌髮和幼苗生長,降低SOD、POD和APX酶活性及GSH和AsA含量, MDA含量和電解質滲漏率升高;噹用含有不同濃度AsA的基質浸提液處理後,與單一基質浸提液處理相比,番茄種子的髮芽率、髮芽勢和髮芽指數均增大,幼苗主根和上胚軸的生長加快,植株的抗氧化酶活性和抗氧化劑含量升高,MDA含量和電解質滲漏率均降低,對幼苗根繫結構的不良影響減少。外源AsA能維持番茄幼苗正常的生理功能,有效緩解連茬基質浸提液對其造成的自毒脅迫。所有處理各指標的綜閤隸屬函數值分析錶明,1 mmol·L-1的AsA緩解效果最好,0.5 mmol·L-1次之。
위탐구외원항배혈산(AsA)제고자독작용하번가항역능력적내재궤제,이우량번가품충“분관일호”위재료,용련작3 a번가적기질침제액처리충자급유묘,연구료불동농도(0、0.25、0.5、1 mmol·L-1)AsA대자독작용하번가충자발아솔、발아세、발아지수화유묘주근、상배축장、항양화매(SOD、POD、APX)활성、항양화제(AsA、GSH)함량、MDA함량화전해질삼루솔급근계초미결구적영향。결과표명:단일기질침제액처리가억제번가충자적맹발화유묘생장,강저SOD、POD화APX매활성급GSH화AsA함량, MDA함량화전해질삼루솔승고;당용함유불동농도AsA적기질침제액처리후,여단일기질침제액처리상비,번가충자적발아솔、발아세화발아지수균증대,유묘주근화상배축적생장가쾌,식주적항양화매활성화항양화제함량승고,MDA함량화전해질삼루솔균강저,대유묘근계결구적불량영향감소。외원AsA능유지번가유묘정상적생리공능,유효완해련치기질침제액대기조성적자독협박。소유처리각지표적종합대속함수치분석표명,1 mmol·L-1적AsA완해효과최호,0.5 mmol·L-1차지。
Ascorbic acid widely present in many plant tissues is a high abundant and small molecular antioxidant. It plays an important role in protecting plant cells from oxidative damages and stimulating cell division and elongation. This experiment was carried out to explore the effects of exogenous ascorbic acid on resistance of tomato to autotoxicity. Tomato seeds were treated with substrate extracts of 3 year continu-ous tomato cropped soil, and the effects of exogenous ascorbic acid at different concentrations(0, 0.25, 0.5, 1 mmol·L-1)on the seed germi-nation and plant growth of tomato and the ultrastructure of roots were then investigated. It was found that substrate extracts suppressed seed germination, seedling growth, decreased the activities of superoxide dismutase, peroxidase, and ascorbate peroxidase, and reduced the con-tent of glutathione and ascorbic acid, but increased malondialdehyde content and relative electrolyte leakage. Compared with substrate ex-tracts, treatments with ascorbic acid at 0.25, 0.5 mmol·L-1 and 1 mmol·L-1 increased the seed germination rate, germination energy and ger-mination index, enhanced seedling root and epicotyl, elevated the protective enzyme activity and antioxidant content, decreased malondi-aldehyde content and relative conductivity. In addition, exogenous ascorbic acid could alleviate harmful effects on root structure. There re-sults indicate that supplying exogenous ascorbic acid could alleviate tomato autotoxicity caused by continuous cropping, with 1 mmol·L-1 having the best effect.