Metabolic and Regulatory Responses in Citrus Rootstocks in Response to Adverse Environmental Conditions

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• 作者：Rosa Argamasilla (1)
  Aurelio Gómez-Cadenas (1)
  Vicent Arbona (1)
  
• 关键词：Abiotic Stress ; Drought ; Metabolomics ; Plant hormones ; Phenylpropanoids ; Soil flooding
• 刊名：Journal of Plant Growth Regulation
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：33
• 期：2
• 页码：169-180
• 全文大小：
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• 作者单位：Rosa Argamasilla (1)
  Aurelio Gómez-Cadenas (1)
  Vicent Arbona (1)
  
  1. Ecofisiologia i Biotecnologia, Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, 12071, Castelló de la Plana, Spain
  
• ISSN：1435-8107

文摘

In response to adverse environmental conditions, plants modify their metabolism to adapt to the new conditions. To differentiate common responses to abiotic stress from specific adaptation to a certain stress condition, two citrus rootstocks (Carrizo citrange and Cleopatra mandarin) with a different ability to tolerate stress were subjected to soil flooding and drought, two water stress conditions. In response to these conditions, both genotypes showed altered root proline and phenylpropanoid levels, especially cinnamic acid, which was a common feature to Carrizo and Cleopatra. This was correlated with alterations in the levels of phenylpropanoid derivatives likely involved in lignin biosynthesis. In the regulatory part, levels of both stress hormones abscisic acid (ABA) and jasmonic acid (JA) decreased in response to soil flooding irrespective of the genotype’s relative flooding tolerance, but, on the other hand, the concentration of both metabolites increased in response to drought, showing a transient accumulation of JA after a few days and a progressive pattern of ABA increase. These responses are probably associated with different regulatory processes under soil flooding and drought. In addition, alterations in indole acetic acid (IAA) levels in citrus roots seemed to be associated with particular stress tolerance. Moreover, both genotypes exhibited a low degree of overlap in the metabolites induced under similar stress conditions, indicating a specific mechanism to cope with stress in plant species. Results also indicated a different metabolic basal status in both genotypes that could contribute to stress tolerance.