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1.
不同钠盐胁迫对高冰草种子萌发的影响 总被引：12，自引：0，他引：12
通过对高冰草种子在不同钠盐(NaCl、NaHCO3、Na2CO3)溶液中萌发情况的研究,旨在探明高冰草种子在不同盐胁迫下的萌发特性。结果表明:碱性盐(NaHCO3、Na2CO3)胁迫较中性盐(NaCl)胁迫显著降低了高冰草的发芽率。高冰草种子在NaCl浓度150mmol/L、NaHCO3浓度100mmol/L和Na2CO3浓度50mmol/L时萌发受到明显抑制。不同钠盐胁迫下高冰草种子胚根和胚芽的受抑制大小顺序为,中性盐NaCl胁迫:胚根<胚芽;碱性盐NaHCO3和Na2CO3胁迫:胚根>胚芽。 相似文献
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外源硫化氢对镉胁迫下黄瓜胚轴和胚根生理生化特性的影响 总被引：1，自引：0，他引：1
以黄瓜（Cucumis sativus L.）种子为试材,研究了外源H2S预处理对镉胁迫下黄瓜胚轴和胚根生理生化特性的影响。结果表明：用浓度为300、600、900和1 200 μmol · L-1的H2S供体NaHS预处理黄瓜种子均能显著缓解镉胁迫对其胚轴和胚根的抑制作用,其中以900 μmol · L-1 NaHS处理效果最好。NaHS处理显著提高了镉胁迫下黄瓜子叶中淀粉酶的活性及胚轴与胚根中SOD、POD、CAT和APX活性,提高了二苯代苦味酰基自由基（DPPH· ）清除能力和羟基自由基（OH· ）清除能力,从而降低了MDA和H2O2含量,而其他钠盐（Na2S、Na2SO4、NaHSO4、Na2SO3、NaHSO3和NaAc）处理效果甚微,表明NaHS缓解镉胁迫对黄瓜胚轴和胚根生长的抑制作用归因于其释放出的H2S。 相似文献
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胡杨种子萌发和胚根生长对环境因子变化的响应 总被引：16，自引：4，他引：12
通过温度、水分、PEG和NaCl溶液对荒漠河岸树种胡杨（Populus euphratica Olivier.）种子萌发和胚根生长的影响研究,结果表明：胡杨种子在10～40℃时萌发率均超过50％;其种子能够在完全水分浸泡情况下萌发生长;在NaCl和PEG-6000溶液胁迫下,萌发率与水势呈显著线性负相关（R^2〉0．89）,并受到温度的微弱影响;水势对种子萌发和胚根生长的抑制作用,在高水势时,NaCl比PEG-6000溶液明显,而在低水势时后者超过了前者;在各种胁迫下,胚根生长都比种子萌发受到的抑制明显。实验结果显示,早期的低盐和充分的水分条件是胡杨幼苗存活的关键。 相似文献
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麻栎胚根切除防穿袋育苗技术的研究与应用 总被引：2，自引：0，他引：2
麻栎是云南滇中地区的本土树种。1999年以来,在云南牟定县启动实施的中德合作造林项目中采取云南松与麻栎混交的主要造林模式,在麻栎育苗过程中,采用普通的塑料袋育苗技术存在出圃前出现主根严重穿袋现象,造成了苗木出圃率和移植成活率较低。为此,开展了麻栎胚根切除技术及育苗用土施肥2种措施,在防止育苗穿袋方面取得了成功,并在中德合作云南二期造林项目中推广和应用3193hm^2,采用麻栎胚根切除技术育苗,苗木合格率提高了25．70％,造林成活率提高了32％,取得了显著的经济和社会效益。 相似文献
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Germination of plants is one of the most important stages during their growth, which is often influenced by environmental stresses, especially drought and salinity. This study was conducted to investigate the effects of salinity and drought on seed germination and growth of Lathyrus sativus. The experiment was laid out in a completely randomized design with factorial arrangement in four replications. Salinity treatments were 0, 2, and 4 dS/m and drought treatments included 0, 0.4, 0.8, and 1.2 MPa. Salinity and drought treatments were prepared by using sodium chloride and polyethylene glycol 6000, respectively. The results showed that salinity and drought stresses decreased germination percentage, and root and radicle length. 相似文献
7.
The rates of hypocotyl and radicle survival and of germination success were investigated in mature acorns ofQuercus variabilis Blume in relation to endosperm loss due to seed insects. The acorns were damaged by curculio weevils (Coleoptera: Curculionidae)
and moths, including tortricid moths (Lepidoptera: Tortricidae); the former were more abundant than the latter. Acorns damaged
by curculio weevils showed a significantly lower germination rate when there was a large endosperm loss than the rate for
sound acorns. The survival rate of the hypocotyl and radicle also decreased as endosperm loss increased. These results suggest
that acorn germination is directly inhibited by damage to the hypocotyl and radicle, which depends on the amount of endosperm
eaten by the weevils. However, the germination rate of acorns with hypocotyl and radicle was consistently high, irrespective
of the degree of endosperm loss, which suggests that weevil-damaged acorns probably germinate, provided the hypocotyl and
radicle survive until the cessation of damage.
Research Fellow of the Japan Society for the Promotion of Science.
This study was supported in part by Grants-in-Aid for Scientific Research from the Japan Ministry of Education, Science and
Culture (No. 09001647, No. 10660144, and No. 11460068) and the Nippon Life Insurance Foundation. 相似文献
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洋参丸经￣（６０）Ｃｏ－γ射线８ｋｇｙ辐照后，灭菌效果显著，含菌数不超过国家规定的卫生标准。人参皂甙含量略有减少，为４．６０％，与对照相比，差异不显著。辐照洋参丸的自由基含量比对照提高一个数量级，１０ｄ后，降到对照差不多的水平；动物毒理试验，血液试验、内脏器官观察和病理检验，结果均无异常改变。 相似文献
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全光照和75％遮荫作为裂区，微波辐射和IBA浸种采用L9（3^4）正交设计进行裂区下的正交试验，了解以上3因素对云南松苗木胚根和胚轴伸长的影响。结果表明，胚根和胚轴在全光照时的理论优水平组合分别为A2 B1和A1 B2；在75％遮荫时分别为A1 B1和A2 B2，仅胚轴在全光照时的理论优水平组合与实际试验结果相一致。全光照下微波辐射促进胚根伸长，而75％遮荫下其促进胚轴伸长。0.1 g/L的IBA浸种促进胚根和胚轴的伸长。 相似文献