CATECHOL ACCUMULATION ON HUANGLONGBING INFECTED CITRUS TREES
| Main Authors: | , SRI WIDINUGRAHENI, , Prof. Dr. Ir. Siti Subandiyah,M.Agr.Sc |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2011
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/89939/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=51994 |
Daftar Isi:
- Huanglongbing, a most devastating citrus disease, is now becoming concern in many citrus industries worldwide. The disease is caused by a phloem limited, gram negative bacteria in the genus Candidatus Liberibacter, that now can be identified using the advantage of molecular tools. It appears that trees infected by the bacteria show mineral deficiency such as zinc and iron (Pustika et al., 2007). Furthermore, in the orange-zinc deficient leaf is found a mass of catechol in its vacuole, as is reported by Reed&Dufrenoy (1942). This study is aimed to see whether catechol is exist in HLB infected citrus trees. Result indicates that there is a trend where catechol level is increasing in symptomatic positive or diseased plant compare to healthy plant, although statistically it is not different. Interestingly, the diseased citrus also shows reducing level of either zinc or iron in accordance to minute-rising level of catechol. This suggest that, possibly there is an interplay between the metals deficiency and catechol production. One possibility is the formation of iron-catechol complex where catechol is chelating iron to form a stable complex. Another possibility, is blocking of nutrient transport by bacterial mass around the phloem and in the vascular system in general. This bacterial mass is acting as elicitor to release phenolic compound like catechol to be produced. To where catechol is produced is not significantly justified, however neutral red staining on cross section of infected citrus midribs are helpful to indicate the phenolic accumulation inside the citrusleave�s tissue.