...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Annals of Forest Science >Differences in morphological and physiological responses to water-logging between two sympatric oak species (Quercus petraea [Matt.] Liebl., Quercus robur L.)
【24h】

Differences in morphological and physiological responses to water-logging between two sympatric oak species (Quercus petraea [Matt.] Liebl., Quercus robur L.)

机译：两种同卵栎树种对水分淹的形态和生理响应的差异（栎属Petraea [Matt。] Liebl。，栎属ro。L.）

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Pedunculate (Quercus robur L.) and sessile (Q. petraea [Matt.] Liebl.) oaks are known to display different ecological requirements, particularly relative to root hypoxia induced by water-logging. Q. robur is more tolerant to hypoxia than Q. petraea. We designed an experiment aiming at identifying morphological and physiological responses to root hypoxia that might differ between the two species. Potted seedlings were submitted during seven weeks to a water-logging treatment with O_2 concentrations below 3 mg L~(-1) in the vicinity of roots. The treatment induced growth cessation in both species. Q. petraea displayed a lower tolerance to hypoxia as demonstrated by the higher number of seedlings suffering shoot dieback and leaf chlorosis as compared to Q. robur. This difference should be related to the high number of adventitious roots and hypertrophied lenticels that were formed in Q. robur, compared to Q. petraea. In the fine roots of the two species, the activity of pyruvate decarboxylase (PDC), the key enzyme of the fermentative pathway, was stimulated after 24 h of water-logging. Transcripts of PDC increased after 48 h of water-logging in Q. robur and not in Q. petraea. Interestingly, transcripts of haemoglobin (Hb) (possibly involved in the putative nitric oxide cycle) followed the same pattern of response than those of PDC. Enzymes of the sucrose degradation pathway displayed decreased activities after 3 weeks of water-logging, probably due to decreased carbohydrate availability. Alcohol dehydrogenase (ADH), sucrose synthase (Susy), and pyruvate kinase (PK) activities were higher in Q. robur after 3 weeks of water-logging. This study provided a set of markers characterizing the differences of tolerance to hypoxia between the two species forfurther studies on intra and inter-specific diversity.
机译：已知有花梗（Quercus robur L.）和无梗（Q. petraea [Matt。] Liebl。）橡木表现出不同的生态需求，尤其是相对于因涝渍引起的根系缺氧。罗伯Q. robur比低Q. petraea更耐缺氧。我们设计了一个旨在鉴定对根缺氧的形态和生理响应的实验，这两种物种之间可能存在差异。盆栽幼苗在7周内接受了浸水处理，根部附近的O_2浓度低于3 mg L〜（-1）。该处理导致两个物种的生长停止。象Q. petraea表现出的对低氧的耐受性较低，这表现为与罗伯特Q. robur相比，遭受芽枯萎和叶绿化的幼苗数量更多。这种差异应该与罗伯特Q. petraea形成的大量不定根和肥大的皮孔有关。在两个物种的细根中，浸水24 h后刺激了发酵途径的关键酶丙酮酸脱羧酶（PDC）的活性。在罗伯Q.而不是Q. petraea浸水48小时后，PDC的转录物增加。有趣的是，血红蛋白（Hb）的转录本（可能参与了假定的一氧化氮循环）与PDC的应答模式相同。淹水3周后，蔗糖降解途径的酶显示出降低的活性，这可能是由于碳水化合物的利用率降低所致。淹水3周后，罗伯酵母中的乙醇脱氢酶（ADH），蔗糖合酶（Susy）和丙酮酸激酶（PK）活性较高。这项研究提供了一套标志物，描述了两个物种对缺氧的耐受性差异，以进一步研究种内和种间多样性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号