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1.
NaCl胁迫对榉树种子萌发及幼苗生理指标的影响 总被引：3，自引：0，他引：3
研究了0.1%、0.2%、0.4%、0.6%和0.8%NaCl浓度处理对榉树种子萌发和幼苗生理指标的影响.结果显示:榉树种子的发芽率,发芽指数和活力指数在较低NaCl浓度(0.1%)处理下即有显著降低;萌发后幼苗的苗高、根长在较低NaCl浓度(≤0.2%)处理下变化不显著,当NaCl浓度达到0.4%及更高对幼苗的苗高和根长显著减小;幼苗SOD、POD活性随NaCl处理浓度的增加呈先升后降的单峰曲线,MDA含量变化不明显.由此推断,榉树在种子萌发阶段对NaCl胁迫较为敏感,但萌发后的幼苗在较低NaCl浓度(0.2%)下可通过增加保护酶的活性来减少NaCl胁迫产生的危害,从而得以正常生长. 相似文献
2.
为了研究不同浓度盐胁迫对苦郎树种子 Clerodendrum inerme 萌发特性的影响,对不同浓度
NaCl 溶液处理下的苦郎树种子进行萌发试验,分析测定种子的发芽率、发芽势、发芽指数、活力指数、
成活率和幼苗根长、苗长等指标。结果表明：0.5%NaCl 胁迫下,苦郎树种子的发芽率、发芽势、发芽指
数、活力指数均优于对照,随着 NaCl 浓度的增加（＞ 0.5%）,苦郎树种子的初始发芽时间和萌发高峰均
随之推迟,发芽率、发芽势、发芽指数、活力指数、根长、苗长均呈逐渐下降趋势。低浓度（≤ 0.5%）对
苦郎树幼苗发育的生长不构成威胁,高浓度 NaCl（＞ 0.5%）胁迫对苦郎树植株的伸长生长有显著的抑制
作用。苦郎树种子能在 0.5% 的盐浓度下正常萌发、生长良好。 相似文献
3.
NaCl胁迫对构树种子发芽及幼苗生理生化指标的影响 总被引：3，自引：0，他引：3
研究了不同浓度NaCl(0,25,50,75,100,125 mmol/L)对构树种子发芽和幼苗生长及生理效应的影响.结果表明:低浓度(25 mmol/L)盐胁迫下,构树种子的发芽率比对照升高了7.7%,同时幼苗根长亦有显著增加,比对照高23%,苗高、发芽指数、活力指数虽有所下降但不显著;随着NaCl浓度的增大,构树种子的发芽率、发芽指数、活力指数均呈下降趋势,发芽后幼苗的根长、苗高、鲜质量等也呈下降趋势,幼苗生长被抑制.对幼苗的生理指标测定显示:细胞膜透性随着盐浓度的增加逐渐升高,细胞膜稳定性受到破坏;MDA含量、SOD、POD活性随盐浓度的增加呈现先升高后降低的趋势,膜透性和MDA含量与SOD活性呈极显著相关. 相似文献
4.
采用盆栽方法,以1年生文冠果幼苗为试材,用不同质量分数(0.0%、0.1%、0.2%、0.4%、0.6%、0.8%)的Na Cl溶液进行浇灌处理,对盐胁迫下文冠果幼苗生长性状进行了研究,结果表明:(1)盐胁迫抑制了文冠果的生长,随着盐胁迫浓度的升高,文冠果幼苗的苗高生长量、地径生长量、地上生物量和地下生物量均呈下降趋势,且在盐胁迫质量分数较高时(0.4%、0.6%、0.8%)下降趋势明显,与对照相比差异均显著(p0.05);(2)文冠果的根冠比在盐胁迫下呈增加趋势,特别是在高质量分数盐胁迫下文冠果的根冠比增加明显(p0.05),盐胁迫下增加生物量在根部的分配是植物应对盐胁迫的方式之一。 相似文献
5.
干旱胁迫下钙离子对矮牵牛种子萌发及幼苗生长的影响 总被引：1，自引：0，他引：1
《河北林果研究》2017,(Z1)
为了了解干旱胁迫下矮牵牛(Petunia hybrida Vilm.)的生长适应能力,试验通过聚乙二醇(PEG-6000)模拟不同程度的干旱条件,研究了干旱胁迫及胁迫后施用CaCl_2对矮牵牛种子萌发和幼苗生长的影响。结果表明:在25℃最适温度下,随着干旱胁迫程度的加剧,矮牵牛种子的发芽率、发芽势、发芽指数及幼苗的胚根长度、胚芽长度、鲜重、干重均呈逐渐下降的趋势。在50%PEG-6000胁迫下,矮牵牛种子及幼苗的以上7项指标最低,其发芽率、发芽势分别为14.67%、2.00%,较对照分别下降了84.50%、95.00%;在50%PEG-6000干旱胁迫下对矮牵牛种子施用CaCl_2,矮牵牛种子的发芽率、发芽势、发芽指数,以及幼苗的胚根长度、胚芽长度、鲜重、干重,随着钙离子浓度的增加均呈先上升后下降的趋势,其中30mmol/L的CaCl_2溶液对其缓解效果最好,其发芽率、发芽势分别为79.33%、31.33%,分别是对照的5.41倍、15.67倍。 相似文献
6.
文冠果种子及幼苗耐盐性试验研究 总被引：2，自引：0，他引：2
《山西林业科技》2017,(1)
以文冠果种子及幼苗为试验材料,利用不同浓度的NaCl溶液(0 mmol/L,100 mmol/L,200 mmol/L,300 mmol/L)进行处理,研究盐胁迫对文冠果种子萌发及幼苗生长的影响。结果表明:随着盐浓度的增大,文冠果发芽率降低,文冠果种子芽长生长与根长生长显著减小。文冠果幼苗在低浓度NaCl胁迫下,地径生长有所增长,苗高生长影响不大;而在高浓度NaCl胁迫下,地径、苗高生长速度与对照相比,均呈显著的下降趋势。 相似文献
7.
NaCl、KNO_3胁迫处理对麻疯树种子萌发及幼苗生长的影响 总被引：1，自引：0，他引：1
分别用0.3%、0.5%、0.7%的NaCl溶液和KNO3溶液浸泡麻疯树(Jatropha curcasL.)种子(以自来水浸泡作对照)24 h后播种,置于温度25℃、光照12 h.d-1、光照强度2 000 lx条件下培养;15 d后将幼苗移栽置于自然条件下,观测种子萌发、幼苗生长及生理生化等指标。结果表明:盐溶液胁迫处理的种子发芽率比对照下降15%以上;0.5%的KNO3溶液处理麻疯树种子对其幼苗生长有促进作用;0.7%的NaCl溶液和KNO3溶液能有效提高幼苗的抗性。 相似文献
8.
盐分胁迫对土沉香苗木生长和生理指标的影响 总被引：2，自引：0，他引：2
通过测定土沉香幼苗在盐分胁迫下生长与生理特征,探讨其耐盐性。结果表明,土沉香幼苗的苗高和地径的增长率随着盐分浓度的增加而减少;叶片膜透性、MDA摩尔浓度、SOD含量、游离脯氨酸含量随着盐分浓度的增加而增加,当NaCl质量分数≤0.4%时,叶片膜透性、MDA摩尔浓度、SOD含量、游离脯氨酸含量与对照相比增加不显著;土沉香叶片中叶绿素含量随着NaCl质量分数的增大呈先增加后减少的趋势,低浓度的盐分胁迫能使叶片中的叶绿素含量增加。由此说明,土沉香苗木具有一定的耐盐性。 相似文献
9.
10.
以2个灌木柳无性系(耐盐型JW2345,盐敏感型SW2367)为试验材料,水培法培养幼苗,盐胁迫(NaCl浓度分别为0,50,100和200 mmol/L)处理幼苗12 d,研究盐胁迫对柳树生长、叶片细胞膜相稳定性及抗氧化酶活性的影响。结果显示:NaCl胁迫抑制了灌木柳幼苗的生长,JW2345受抑制程度明显小于JW2367;在100 mmol/L NaCl处理下,随着NaCl胁迫时间的延长,其细胞膜相稳定性下降,MDA含量增加,但无性系不同,变化幅度不同。叶片CAT活性均先升高后下降,SOD和POD活性变化规律显著不同,JW2345中SOD和POD均显著高于对照,且随处理时间的延长呈升高趋势;短期胁迫对JW2367的SOD活性无影响,长期胁迫诱导其显著上升,而POD活性先增加后降低。研究认为:NaCl胁迫抑制灌木柳幼苗的生长,破坏膜相稳定性。耐盐性较强的JW2345受破坏程度较低,这可能与其维持抗氧化系统平衡密切相关,其中SOD、POD起关键作用。 相似文献
11.
Effects of NaCl on seed germination, leaf gas exchange and seedling growth were investigated. The germination of P. tatarinowii seeds was delayed in the presence of NaCl, and was significantly inhibited when NaCl concentration exceeded 17 mM (1.0 g·L−1). NaCl treatments induced reductions of transpiration rate, stomatal conductance and net photosynthetic rate and their reductions
were significant with the increasing of NaCl concentration. However, intercellular CO2 concentration in seedling leaves under salt stress was significantly higher than that of controls. There was a significant
reduction in survival, basal diameter increment and height increment with increasing NaCl concentration 50 days after NaCl
treatment, and a significant reduction in the dry weight increment of roots, stems, and leaves was also observed in the NaCl
treatments. The deleterious effect on the biomass increment was more evident in the case of stems and leaves. Results from
this study suggest that P. tatarinowii is sensitive to salinity stress and the salinity threshold for seedling growth might be less 34 mM (2.0 g·L−1).
Biography: FANG Sheng-zuo (1963–), male, Professor, College of Forest Resources and Environment, Nanjing Forestry University, Nanjing
210037, P. R. China. 相似文献
12.
NaCl处理对刺槐种子萌发的影响 总被引：2，自引：0，他引：2
以0．2％、0．4％、0．6％、0．8％等4种不同浓度的NaCl溶液处理刺槐种子,以蒸馏水（CK）为对照,探讨NaCl处理对刺槐种子萌发的影响,结果表明：随着处理浓度的升高,刺槐种子发芽能力和胚芽苗生长受到抑制的程度增大,剌槐种子萌发能忍耐的NaCl处理浓度为0．2％以下。 相似文献
13.
Seed germination and seedling extension growth in Ougeinia dalbergioides Benth. under water and salinity stress 总被引：5，自引：0，他引：5
Seed germination and early seedling growth were studied in Ougeinia dalbergioides Benth. varn. Sandan seeds under different levels of water and salinity stresses in laboratory conditions. Increasing level of water and salinity stresses caused reduction in total as well as rate of germination which was significant beyond –0.6 MPa and 0.16 M levels of water and salinity stresses, respectively. The reduction was more in rate than in total percent germination and in extension growth than in germination. Germination Index (GI) decreased while Mean Germination Time (MGT) increased with increasing stress. The water uptake by seeds also declined with increasing stresses. Early seedling growth as well as Seedling Vigour Index (SVI) markedly decreased under both the stresses. 相似文献
14.
Seyed Mohammad Hosseini Nasr Aidin Parsakhoo Hamed Naghavi Sekineh Kiani Savad Koohi 《New Forests》2012,43(1):45-55
The present study was conducted to evaluate the effect of different concentrations of salts on seed germination and seedling
growth of Prosopis juliflora. The experiment was carried out in Forestry Laboratory at Sari Agricultural Sciences and Natural Resources University, Iran.
The collected seeds were treated with boiling water and H2SO4 then left to germinate in controlled growth chamber. Seed were grown under salinity levels 100, 200 and 300 mM of CaCl2, NaH2PO4, KNO3 and KH2PO4. Germination parameters and various seedling growth variables such as root and stem length, seedlings fresh and dry weight
were measured after 56 days. Results showed that germination percentage significantly decreased as the salinity level of medium
increased. Salinity treatments at 100 mM enhanced the percentage of seeds germination and significantly improved the germination
index and seeds stamina. In this study, the best treatment was 100 mM salinity for biomass production of seedlings. For Prosopis juliflora, 100 mM salinity significantly enhanced both germination and biomass production. 相似文献
15.
盐胁迫对木瓜种子萌发和幼苗生长的影响 总被引：2，自引：0，他引：2
以MS培养基培养木瓜种子,观察研究在不同的NaCl浓度胁迫下,木瓜种子萌发和幼苗生长的状况.结果表明:随着NaCl浓度的增加,木瓜种子萌发率逐渐降低,幼苗根系活力下降;叶绿素含量、SOD酶活性以及POD酶活性逐渐升高,但当培养基中NaCl浓度过高时,以上3个指标开始下降;MDA含量与NaCl浓度有关,随着NaCl浓度的增加,MDA含量逐渐增加,但均小于对照. 相似文献
16.
NaCl和Na2CO3胁迫对四翅滨藜种子萌发及保护酶活性的影响 总被引：1，自引：0，他引：1
土壤盐渍化是困扰人类的五大土壤问题之一(王春裕等,1997).我国华北和滨海地区存在大量盐渍化土地,有些区域土壤含盐量达到1%以上(毛建华等,2005),严重影响着当地种植业生产的持续发展,也给园林绿化带来很大困难. 相似文献
17.
用定位研究的方法,在丹东不同区域建立生态因子观测场,测定不同土层厚度、pH值、土壤养分含量、空气温湿度、光照强度、降雨、蒸发量等各因子对银杏生长的影响,结果表明:在不同的温度条件下,银杏种子萌发和幼苗生长状况不同,经20 d后,种子发芽率恒温比变温高6.2个百分点,幼苗根系生长、苗高、地径恒温比变温分别提高36.7%和16%。经过遮阴处理,银杏幼苗生长好于对照区。生长在壤土和沙壤土上的银杏其生长表现优于生长在沙土和黏土上的,土壤含盐量以0.03%～0.043%,银杏生长良好。银杏对pH值适应范围很宽,在pH值4～8.5的土壤上均能生长。 相似文献
18.
Reduced physiological efficiency as well as low and irregular germination rate under environmental stress conditions (e.g., salinity) are among the major factors affecting the propagation of numerous plants, in particular medicinal ones. A factorial experiment using a completely randomized design was employed to evaluate the effect of plant growth-promoting rhizobacteria (PGPR) on hopbush seed germination and seedling growth under salinity stress. After the seeds were inoculated with the Azospirillum lipoferum, Azotobacter chroococcum, and Azospirillum + Azotobacter and exposed to salinity stress at six levels, they were placed into a germinator at 20°C temperature and 65% relative humidity with a photoperiodic regime of 16 h light/8 h dark at 1,000 lux fluorescent light. The seeds inoculated with the bacterial strains could tolerate salinity levels of up to 50 dS/m and germinate. The combined treatment of Azospirillum + Azotobacter increased germination percentage at 20 and 50 dS/m levels by 21.67 and 10%, respectively. Also, A. chroococcum at 15 and 20 dS/m and Azospirillum + Azotobacter at 50 dS/m stress levels increased germination rate by 88, 316, and 155%, respectively, compared with the control. Furthermore, plant growth parameters—e.g., root and stem length, root and stem dry and fresh weights, as well as the ratios of root length and weight to the stem counterparts—were considerably enhanced by Azotobacter chroococcum treatment under elevated salinity stress (15 and 20 dS/m), relative to the control. Inoculation with A. chroococcum more favorably affected on and was also more compatible with Dodonaea viscosa seedlings leading to considerably improved seedlings growth parameters as well as seed germination under salinity stress. 相似文献
19.