Amino acids implicated in plant defense are higher in Candidatus Liberibacter asiaticus-tolerant citrus varieties
Identifieur interne : 000345 ( Main/Merge ); précédent : 000344; suivant : 000346Amino acids implicated in plant defense are higher in Candidatus Liberibacter asiaticus-tolerant citrus varieties
Auteurs : Nabil Killiny ; Faraj HijazSource :
- Plant Signaling & Behavior [ 1559-2316 ] ; 2016.
Abstract
Citrus Huanglongbing (HLB), also known as citrus greening, has been threatening the citrus industry since the early 1900's and up to this date there are no effective cures for this disease. Field observations and greenhouse controlled studies demonstrated that some citrus genotypes are more tolerant to
Url:
DOI: 10.1080/15592324.2016.1171449
PubMed: 27057814
PubMed Central: 4883877
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are higher in <italic>Candidatus</italic>
Liberibacter asiaticus-tolerant citrus varieties</title>
<author><name sortKey="Killiny, Nabil" sort="Killiny, Nabil" uniqKey="Killiny N" first="Nabil" last="Killiny">Nabil Killiny</name>
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<author><name sortKey="Hijaz, Faraj" sort="Hijaz, Faraj" uniqKey="Hijaz F" first="Faraj" last="Hijaz">Faraj Hijaz</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Amino acids implicated in plant <underline>defense</underline>
are higher in <italic>Candidatus</italic>
Liberibacter asiaticus-tolerant citrus varieties</title>
<author><name sortKey="Killiny, Nabil" sort="Killiny, Nabil" uniqKey="Killiny N" first="Nabil" last="Killiny">Nabil Killiny</name>
<affiliation><nlm:aff id="af0001"></nlm:aff>
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<author><name sortKey="Hijaz, Faraj" sort="Hijaz, Faraj" uniqKey="Hijaz F" first="Faraj" last="Hijaz">Faraj Hijaz</name>
<affiliation><nlm:aff id="af0001"></nlm:aff>
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<series><title level="j">Plant Signaling & Behavior</title>
<idno type="ISSN">1559-2316</idno>
<idno type="eISSN">1559-2324</idno>
<imprint><date when="2016">2016</date>
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<front><div type="abstract" xml:lang="en"><title>ABSTRACT</title>
<p>Citrus Huanglongbing (HLB), also known as citrus greening, has been threatening the citrus industry since the early 1900's and up to this date there are no effective cures for this disease. Field observations and greenhouse controlled studies demonstrated that some citrus genotypes are more tolerant to <italic>Candidatus Liberibacter</italic>
asiaticus <italic>(C</italic>
Las) pathogen than others. However, the mechanisms underpinning tolerance has not been determined yet. The phloem sap composition of <italic>C</italic>
Las-tolerant and sensitive citrus varieties was studied to identify metabolites that could be responsible for their tolerance to <italic>C</italic>
Las. The citrus phloem sap was collected by centrifugation and was analyzed with gas chromatography-mass spectrometry after methyl chloroformate derivatization. Thirty-three metabolites were detected in the phloem sap of the studied varieties: twenty 20 amino acids, eight 8 organic acids, and five 5 fatty acids. Interestingly, the levels of most amino acids, especially those implicated in plantdefense to pathogens such as phenylalanine, tyrosine, tryptophan, lysine, and asparagine were higher in tolerant varieties. Although the level of organic acids varied between cultivars, this variation was not correlated with citrus resistance to <italic>C</italic>
Las and could be cultivar specific. The fatty acids were found in trace amounts and in most cases their levels were not significantly different among varieties. Better understanding of the mechanisms underpinning citrus tolerance to <italic>C</italic>
Las will help in developing economically tolerant varieties.</p>
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