[Objective] The paper was to study the effects of exogenous GA3 on seed germination and seedling growth of Salicornia europaea L.under salt stress.[Method] With the combination of different concentrations of NaCl(50,...[Objective] The paper was to study the effects of exogenous GA3 on seed germination and seedling growth of Salicornia europaea L.under salt stress.[Method] With the combination of different concentrations of NaCl(50,100,150,200,250,300,350,400 mmol/L)with 10 μmol /L GA3 treatments,the effects of exogenous GA3 on seed germination and seedling growth of S.europaea under salt stress were studied.[Result] Exogenous GA3 promoted the seed germination rate,germination capacity,germination index and seed vigor index of S.europaea under salt stress.Under the treatment of exogenous GA3,the root system vigor,the lengths of roots and stems and the salt-tolerance of S.europaea were higher than that of single salt stress treatment.[Conclusion] Within a certain concentration range,exogenous GA3 could alleviate the inhibition effects of salt stress on seed germination and seedling growth of S.europaea.展开更多
Salt stress is one of the most serious limiting factors for crop growth and production. This study was carried out to evaluate the effects of salt stress in four Mentha piperita L. varieties, in greenhouse conditions....Salt stress is one of the most serious limiting factors for crop growth and production. This study was carried out to evaluate the effects of salt stress in four Mentha piperita L. varieties, in greenhouse conditions. The seedlings were irrigated with 1/2 Hoagland nutrition solutions. Following 10 d of growth in the pots, the seedlings were subjected to salt stress with different concentrations of NaCl (0, 50 and 100 mM, respectively). Responses of the mint varieties to salt stress were evaluated using some plant growth and physiological parameters, such as plant height, root length, shoot and root fresh and dry weight, and ion concentrations in leaves, such as Na, K, Ca and Cl. Salt stress caused reduction in physiological parameters. However, this reduction was significant at 100 mM NaCl compared to 50 mM NaCl. These two concentrations of NaCl increased Na and Cl contents in leaves. However, K and Ca contents were decreased with salinity. The results showed that Mentha piperita cv. Sewiss and Granada were found more tolerant to salt stress than cv. Marokko and Citaro.展开更多
为探究丛枝菌根真菌对拟南芥〔Arabidopsis thaliana(Linn.)Heynh.〕耐盐性的影响,测定了接种摩西斗管囊霉〔Funneliformis mosseae(T.H.Nicolson et Gerd.)C.Walker et A.Schüler〕和细凹无梗囊霉(Acaulospora scrobiculata Trap...为探究丛枝菌根真菌对拟南芥〔Arabidopsis thaliana(Linn.)Heynh.〕耐盐性的影响,测定了接种摩西斗管囊霉〔Funneliformis mosseae(T.H.Nicolson et Gerd.)C.Walker et A.Schüler〕和细凹无梗囊霉(Acaulospora scrobiculata Trappe)后及(或)质量体积分数2%NaCl胁迫下拟南芥种子萌发率、幼苗鲜质量和根长及抗逆相关基因表达情况。结果显示:在无NaCl胁迫下,接种细凹无梗囊霉显著(P<0.05)提高了拟南芥种子萌发率,接种2种菌均显著提高了幼苗鲜质量而降低了幼苗根长;在NaCl胁迫下,接种2种菌均明显提高了种子萌发率及幼苗鲜质量和根长,且以细凹无梗囊霉的影响更为明显。在NaCl胁迫和非胁迫下,接种摩西斗管囊霉使PAP1、PDF1、POD表达水平显著上调,接种细凹无梗囊霉使NCED3表达水平显著上调。总体来看,摩西斗管囊霉和细凹无梗囊霉均能够促进拟南芥种子萌发和幼苗生长并提高其耐盐性,且细凹无梗囊霉的作用更为明显。展开更多
为明确盐、干旱及盐旱复合胁迫对不同大豆(Glycine max L.)品种(系)生长和光合特性等的影响,本研究以7个大豆品种(系)为材料,设置对照(CK,正常供水,75%田间最大持水量)、盐胁迫(S,土壤含盐量0.44%)、干旱胁迫(D,35%田间最大持水量)和盐...为明确盐、干旱及盐旱复合胁迫对不同大豆(Glycine max L.)品种(系)生长和光合特性等的影响,本研究以7个大豆品种(系)为材料,设置对照(CK,正常供水,75%田间最大持水量)、盐胁迫(S,土壤含盐量0.44%)、干旱胁迫(D,35%田间最大持水量)和盐旱复合胁迫(S+D,35%田间最大持水量,土壤含盐量0.44%)4个处理,采用盆栽方式,研究不同处理对大豆苗期生长、光合特性、叶绿素含量、叶绿素荧光参数和根系构型等31个指标的影响。结果表明,与对照相比,盐和盐旱复合胁迫均显著降低大豆幼苗的数字生物量、叶面积、归一化植被指数和叶片的叶绿素含量、暗反应最大荧光(Fm)、最大光化学效率(Fv/Fm)、PSⅡ的潜在活性(Fv/Fo)、实际光化学效率(ΦPSⅡ)、表观光合电子传递速率(ETR)、非光化学猝灭系数(NPQ),且在盐旱复合胁迫处理下降幅更大,干旱胁迫显著增加大豆幼苗的叶片角度和叶片投影面积;三种胁迫处理均明显降低大豆总根长、根表面积、根体积、根尖数、根分叉数、交叉数和光合速率、气孔导度、胞间CO_(2)浓度及蒸腾速率,且多数指标下降达显著水平,干旱胁迫处理的降幅小于盐和盐旱复合胁迫处理。综上可知,盐旱复合胁迫对大豆幼苗生长的影响最明显,盐胁迫次之,干旱胁迫最轻。由主成分分析和隶属函数综合评价结果得出,21C49为耐盐品系,蒙豆46为耐旱、耐盐旱复合胁迫品种,黑科68为盐敏感、旱敏感品种,龙垦330为盐旱复合胁迫敏感品种。展开更多
基金Supported by General Projects of Basic Research of Natural Sciencein Jiangsu Universities(KJD180118)Excellent Course Construction Project of Plant Physiology in Jiangsu Province(2010)+1 种基金Innovative Team Building and Personnel Training Programs in Zhejiang Science and Technology Department(2010F20007)Outstanding Teaching Team Project in Nanjing Xiaozhuang College(4085024)~~
文摘[Objective] The paper was to study the effects of exogenous GA3 on seed germination and seedling growth of Salicornia europaea L.under salt stress.[Method] With the combination of different concentrations of NaCl(50,100,150,200,250,300,350,400 mmol/L)with 10 μmol /L GA3 treatments,the effects of exogenous GA3 on seed germination and seedling growth of S.europaea under salt stress were studied.[Result] Exogenous GA3 promoted the seed germination rate,germination capacity,germination index and seed vigor index of S.europaea under salt stress.Under the treatment of exogenous GA3,the root system vigor,the lengths of roots and stems and the salt-tolerance of S.europaea were higher than that of single salt stress treatment.[Conclusion] Within a certain concentration range,exogenous GA3 could alleviate the inhibition effects of salt stress on seed germination and seedling growth of S.europaea.
文摘Salt stress is one of the most serious limiting factors for crop growth and production. This study was carried out to evaluate the effects of salt stress in four Mentha piperita L. varieties, in greenhouse conditions. The seedlings were irrigated with 1/2 Hoagland nutrition solutions. Following 10 d of growth in the pots, the seedlings were subjected to salt stress with different concentrations of NaCl (0, 50 and 100 mM, respectively). Responses of the mint varieties to salt stress were evaluated using some plant growth and physiological parameters, such as plant height, root length, shoot and root fresh and dry weight, and ion concentrations in leaves, such as Na, K, Ca and Cl. Salt stress caused reduction in physiological parameters. However, this reduction was significant at 100 mM NaCl compared to 50 mM NaCl. These two concentrations of NaCl increased Na and Cl contents in leaves. However, K and Ca contents were decreased with salinity. The results showed that Mentha piperita cv. Sewiss and Granada were found more tolerant to salt stress than cv. Marokko and Citaro.
文摘为探究丛枝菌根真菌对拟南芥〔Arabidopsis thaliana(Linn.)Heynh.〕耐盐性的影响,测定了接种摩西斗管囊霉〔Funneliformis mosseae(T.H.Nicolson et Gerd.)C.Walker et A.Schüler〕和细凹无梗囊霉(Acaulospora scrobiculata Trappe)后及(或)质量体积分数2%NaCl胁迫下拟南芥种子萌发率、幼苗鲜质量和根长及抗逆相关基因表达情况。结果显示:在无NaCl胁迫下,接种细凹无梗囊霉显著(P<0.05)提高了拟南芥种子萌发率,接种2种菌均显著提高了幼苗鲜质量而降低了幼苗根长;在NaCl胁迫下,接种2种菌均明显提高了种子萌发率及幼苗鲜质量和根长,且以细凹无梗囊霉的影响更为明显。在NaCl胁迫和非胁迫下,接种摩西斗管囊霉使PAP1、PDF1、POD表达水平显著上调,接种细凹无梗囊霉使NCED3表达水平显著上调。总体来看,摩西斗管囊霉和细凹无梗囊霉均能够促进拟南芥种子萌发和幼苗生长并提高其耐盐性,且细凹无梗囊霉的作用更为明显。
文摘为明确盐、干旱及盐旱复合胁迫对不同大豆(Glycine max L.)品种(系)生长和光合特性等的影响,本研究以7个大豆品种(系)为材料,设置对照(CK,正常供水,75%田间最大持水量)、盐胁迫(S,土壤含盐量0.44%)、干旱胁迫(D,35%田间最大持水量)和盐旱复合胁迫(S+D,35%田间最大持水量,土壤含盐量0.44%)4个处理,采用盆栽方式,研究不同处理对大豆苗期生长、光合特性、叶绿素含量、叶绿素荧光参数和根系构型等31个指标的影响。结果表明,与对照相比,盐和盐旱复合胁迫均显著降低大豆幼苗的数字生物量、叶面积、归一化植被指数和叶片的叶绿素含量、暗反应最大荧光(Fm)、最大光化学效率(Fv/Fm)、PSⅡ的潜在活性(Fv/Fo)、实际光化学效率(ΦPSⅡ)、表观光合电子传递速率(ETR)、非光化学猝灭系数(NPQ),且在盐旱复合胁迫处理下降幅更大,干旱胁迫显著增加大豆幼苗的叶片角度和叶片投影面积;三种胁迫处理均明显降低大豆总根长、根表面积、根体积、根尖数、根分叉数、交叉数和光合速率、气孔导度、胞间CO_(2)浓度及蒸腾速率,且多数指标下降达显著水平,干旱胁迫处理的降幅小于盐和盐旱复合胁迫处理。综上可知,盐旱复合胁迫对大豆幼苗生长的影响最明显,盐胁迫次之,干旱胁迫最轻。由主成分分析和隶属函数综合评价结果得出,21C49为耐盐品系,蒙豆46为耐旱、耐盐旱复合胁迫品种,黑科68为盐敏感、旱敏感品种,龙垦330为盐旱复合胁迫敏感品种。