Differential structure and physiological response to canker challenge between 'Meiwa' kurnquat and 'Newhall' navel orange with contrasting resistance
Identifieur interne : 001955 ( Main/Exploration ); précédent : 001954; suivant : 001956Differential structure and physiological response to canker challenge between 'Meiwa' kurnquat and 'Newhall' navel orange with contrasting resistance
Auteurs : YIN WANG [République populaire de Chine] ; Xing-Zheng Fu [République populaire de Chine] ; Ji-Hong Liu [République populaire de Chine] ; NI HONG [République populaire de Chine]Source :
- Scientia horticulturae [ 0304-4238 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Horticulture.
English descriptors
- KwdEn :
Abstract
Asiatic citrus canker caused by Xanthomonas citri subsp. citri (Xcc) is one of the most detrimental diseases affecting citrus production. 'Meiwa' kumquat (Fortunella crassifolia) and 'Newhall' navel orange (Citrus sinensis) are two genotypes with contrasting Xcc resistance. In the current study, efforts were made to perform pairwise comparison between them in terms of structural difference and biochemical response to Xcc attack. Pinprick inoculation demonstrated that 'Meiwa' had lower disease incidence rate and smaller lesion size, concurrent with significantly less bacterial number at the inoculation sites relative to 'Newhall'. Microscopic observation demonstrated that stomatal density and size of 'Meiwa' were significantly smaller than 'Newhall'. Stomatal apertures of 'Meiwa' were smaller than 'Newhall' measured at 2 h after their leaves were immersed in Xcc suspension, consistent with the bacteria number in the internal tissues counted at 4d. Epicuticular wax content of 'Meiwa' was significantly higher than that of 'Newhall', while no difference in palisade and spongy tissue was observed between them. Enzymatic activity assay showed that after Xcc inoculation, 'Meiwa' exhibited significantly higher activities of catalase (CAT), peroxidase (POD) and phenylalanine ammonia-lyase (PAL) in comparison with 'Newhall' at most of the sampling time points. Our data showed that the two genotypes with contrasting Xcc resistance exhibited clear difference in the structure and physiological response, which may provide information to facilitate our understanding of Xcc resistance.
Affiliations:
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xml:lang="fr"><term>Horticulture</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Asiatic citrus canker caused by Xanthomonas citri subsp. citri (Xcc) is one of the most detrimental diseases affecting citrus production. 'Meiwa' kumquat (Fortunella crassifolia) and 'Newhall' navel orange (Citrus sinensis) are two genotypes with contrasting Xcc resistance. In the current study, efforts were made to perform pairwise comparison between them in terms of structural difference and biochemical response to Xcc attack. Pinprick inoculation demonstrated that 'Meiwa' had lower disease incidence rate and smaller lesion size, concurrent with significantly less bacterial number at the inoculation sites relative to 'Newhall'. Microscopic observation demonstrated that stomatal density and size of 'Meiwa' were significantly smaller than 'Newhall'. Stomatal apertures of 'Meiwa' were smaller than 'Newhall' measured at 2 h after their leaves were immersed in Xcc suspension, consistent with the bacteria number in the internal tissues counted at 4d. Epicuticular wax content of 'Meiwa' was significantly higher than that of 'Newhall', while no difference in palisade and spongy tissue was observed between them. Enzymatic activity assay showed that after Xcc inoculation, 'Meiwa' exhibited significantly higher activities of catalase (CAT), peroxidase (POD) and phenylalanine ammonia-lyase (PAL) in comparison with 'Newhall' at most of the sampling time points. Our data showed that the two genotypes with contrasting Xcc resistance exhibited clear difference in the structure and physiological response, which may provide information to facilitate our understanding of Xcc resistance.</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li></country></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Yin Wang" sort="Yin Wang" uniqKey="Yin Wang" last="Yin Wang">YIN WANG</name></noRegion><name sortKey="Fu, Xing Zheng" sort="Fu, Xing Zheng" uniqKey="Fu X" first="Xing-Zheng" last="Fu">Xing-Zheng Fu</name><name sortKey="Liu, Ji Hong" sort="Liu, Ji Hong" uniqKey="Liu J" first="Ji-Hong" last="Liu">Ji-Hong Liu</name><name sortKey="Ni Hong" sort="Ni Hong" uniqKey="Ni Hong" last="Ni Hong">NI HONG</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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