scholarly journals Cuticular Wax Composition of Coconut Palms and their Susceptibility to Lethal Yellowing Disease

2017 ◽  
Vol 56 (1) ◽  
Author(s):  
Gabriela A. Arroyo-Serralta ◽  
Daniel Zizumbo-Villareal ◽  
Fabiola Escalante Erosa ◽  
Luis M. Peña- Rodríguez
Keyword(s):  
Chromatographic Analysis ◽  
Cuticular Wax ◽  
Cuticular Waxes ◽  
Lethal Yellowing Disease ◽  
Lethal Yellowing ◽  
Yellowing Disease ◽  
Main Components ◽  
The Individual ◽  
Plant Pathogen Interactions

A number of metabolites isolated and identified from cuticular waxes have been used as chemotaxonomical markers and to explain the role of the wax layer in plant-insect and plant-pathogen interactions. Chromatographic analysis of the cuticular wax from pinnae of five coconut palm ecotypes showed that the three main components (<strong>I</strong>, <strong>II</strong>, <strong>III</strong>) in the wax can be used as chemotaxonomical markers for classification. The positive correlation found between the content of metabolites <strong>I</strong>, <strong>II</strong>, and <strong>III</strong> in the wax from the various ecotypes and their resistance or susceptibility to the lethal yellowing disease of coconut palms, did not coincide with the results obtained in an antifeedant assay. The results suggest that while the individual components do not play a significant role in the palm-insect interaction, the full composition of the cuticular wax does.

scholarly journals Dissecting the Roles of Cuticular Wax in Plant Resistance to Shoot Dehydration and Low-Temperature Stress in Arabidopsis

2021 ◽  
Vol 22 (4) ◽  
pp. 1554
Author(s):  
Tawhidur Rahman ◽  
Mingxuan Shao ◽  
Shankar Pahari ◽  
Prakash Venglat ◽  
Raju Soolanayakanahally ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Low Temperature ◽  
Cold Acclimation ◽  
Water Loss ◽  
Cuticular Wax ◽  
Dehydration Stress ◽  
Wax Deposition ◽  
Cuticular Waxes ◽  
Gas Chromatography Mass Spectroscopy

Cuticular waxes are a mixture of hydrophobic very-long-chain fatty acids and their derivatives accumulated in the plant cuticle. Most studies define the role of cuticular wax largely based on reducing nonstomatal water loss. The present study investigated the role of cuticular wax in reducing both low-temperature and dehydration stress in plants using Arabidopsis thaliana mutants and transgenic genotypes altered in the formation of cuticular wax. cer3-6, a known Arabidopsis wax-deficient mutant (with distinct reduction in aldehydes, n-alkanes, secondary n-alcohols, and ketones compared to wild type (WT)), was most sensitive to water loss, while dewax, a known wax overproducer (greater alkanes and ketones compared to WT), was more resistant to dehydration compared to WT. Furthermore, cold-acclimated cer3-6 froze at warmer temperatures, while cold-acclimated dewax displayed freezing exotherms at colder temperatures compared to WT. Gas Chromatography-Mass Spectroscopy (GC-MS) analysis identified a characteristic decrease in the accumulation of certain waxes (e.g., alkanes, alcohols) in Arabidopsis cuticles under cold acclimation, which was additionally reduced in cer3-6. Conversely, the dewax mutant showed a greater ability to accumulate waxes under cold acclimation. Fourier Transform Infrared Spectroscopy (FTIR) also supported observations in cuticular wax deposition under cold acclimation. Our data indicate cuticular alkane waxes along with alcohols and fatty acids can facilitate avoidance of both ice formation and leaf water loss under dehydration stress and are promising genetic targets of interest.

scholarly journals Genetic resistance of Eucalyptus globulus to autumn gum moth defoliation and the role of cuticular waxes

2002 ◽  
Vol 32 (11) ◽  
pp. 1961-1969 ◽  
Author(s):  
T H Jones ◽  
B M Potts ◽  
R E Vaillancourt ◽  
N W Davies
Keyword(s):  
Genetic Variation ◽  
Eucalyptus Globulus ◽  
Field Trial ◽  
Genetic Resistance ◽  
Cuticular Wax ◽  
Wax Esters ◽  
Broad Sense ◽  
Broad Sense Heritability ◽  
Cuticular Waxes

This study investigated the association between resistance of Eucalyptus globulus Labill. to autumn gum moth (Mnesempala privata Guenée) defoliation and cuticular wax compounds. In a field trial consisting of clonally replicated F2 families of E. globulus, situated in Tasmania, Australia, significant genetic variation in resistance was detected in two of three F2 families. The broad-sense heritability for defoliation within families ranged from 0.24 to 0.33. The 15 most resistant and the 15 most susceptible genotypes within each variable family were compared for their relative levels of 26 cuticular wax compounds. While no significant correlation between resistance and total wax yield estimates was found, significant differences were detected between resistant and susceptible classes in the relative quantities of several aliphatic phenylethyl and benzyl wax esters within both families. This association does not appear to be a response induced by defoliation. The broad-sense heritabilities of the variation in these compounds were high (0.82–0.94). Our findings suggest that these wax compounds are a mechanism of genetic resistance to autumn gum moth in E. globulus.

scholarly journals Promising primers for detection of phytoplasma causing coconut lethal yellowing disease in Mozambique

2018 ◽  
Vol 46 (3) ◽  
pp. 301-308
Author(s):  
M. O. M. Mazivele ◽  
Valter Nuaila ◽  
M. Durante ◽  
M. M. Colombo ◽  
E. Taviani
Keyword(s):  
Lethal Yellowing Disease ◽  
Lethal Yellowing ◽  
Yellowing Disease

scholarly journals Update on Cuticular Wax Biosynthesis and Its Roles in Plant Disease Resistance

2020 ◽  
Vol 21 (15) ◽  
pp. 5514
Author(s):  
Xiaoyu Wang ◽  
Lingyao Kong ◽  
Pengfei Zhi ◽  
Cheng Chang
Keyword(s):  
Disease Resistance ◽  
Plant Disease Resistance ◽  
Plant Disease ◽  
Molecular Mechanisms ◽  
Higher Plants ◽  
Defense Responses ◽  
Cuticular Wax ◽  
Cuticular Waxes ◽  
Infection Processes ◽  
Plant Pathogen Interactions

The aerial surface of higher plants is covered by a hydrophobic layer of cuticular waxes to protect plant tissues against enormous environmental challenges including the infection of various pathogens. As the first contact site between plants and pathogens, the layer of cuticular waxes could function as a plant physical barrier that limits the entry of pathogens, acts as a reservoir of signals to trigger plant defense responses, and even gives cues exploited by pathogens to initiate their infection processes. Past decades have seen unprecedented proceedings in understanding the molecular mechanisms underlying the biosynthesis of plant cuticular waxes and their functions regulating plant–pathogen interactions. In this review, we summarized the recent progress in the molecular biology of cuticular wax biosynthesis and highlighted its multiple roles in plant disease resistance against bacterial, fungal, and insect pathogens.

scholarly journals Molecular and biological characterization of phytoplasmas from coconut palms affected by the lethal yellowing disease in Africa

2019 ◽  
Vol 223-225 ◽  
pp. 51-57 ◽  
Author(s):  
Nicoletta Contaldo ◽  
Gianfranco D’Amico ◽  
Samanta Paltrinieri ◽  
Hortense A. Diallo ◽  
Assunta Bertaccini ◽  
...  
Keyword(s):  
Biological Characterization ◽  
Lethal Yellowing Disease ◽  
Lethal Yellowing ◽  
Yellowing Disease

scholarly journals Multilocus Sequence Analysis Reveals Three Distinct Populations of “CandidatusPhytoplasma palmicola” with a Specific Geographical Distribution on the African Continent

2019 ◽  
Vol 85 (8) ◽  
Author(s):  
Fabian Pilet ◽  
Robert Nketsia Quaicoe ◽  
Isaac Jesuorobo Osagie ◽  
Marcos Freire ◽  
Xavier Foissac
Keyword(s):  
Multilocus Sequence Typing ◽  
Housekeeping Genes ◽  
Epidemiological Studies ◽  
African Continent ◽  
African Countries ◽  
Plant Host ◽  
Specific Distribution ◽  
Lethal Yellowing Disease ◽  
Lethal Yellowing ◽  
Yellowing Disease

ABSTRACTTo sustain epidemiological studies on coconut lethal yellowing disease (CLYD), a devastating disease in Africa caused by a phytoplasma, we developed a multilocus sequence typing (MLST) scheme for “CandidatusPhytoplasma palmicola” based on eight housekeeping genes. At the continental level, eight different sequence types were identified among 132 “CandidatusPhytoplasma palmicola”-infected coconuts collected in Ghana, Nigeria, and Mozambique, where CLYD epidemics are still very active. “CandidatusPhytoplasma palmicola” appeared to be a bacterium that is subject to strong bottlenecks, reducing the fixation of positively selected beneficial mutations into the bacterial population. This phenomenon, as well as a limited plant host range, might explain the observed country-specific distribution of the eight haplotypes. As an alternative means to increase fitness, bacteria can also undergo genetic exchange; however, no evidence for such recombination events was found for “CandidatusPhytoplasma palmicola.” The implications for CLYD epidemiology and prophylactic control are discussed. The usefulness of seven housekeeping genes to investigate the genetic diversity in the genus “CandidatusPhytoplasma” is underlined.IMPORTANCECoconut is an important crop for both industry and small stakeholders in many intertropical countries. Phytoplasma-associated lethal yellowing-like diseases have become one of the major pests that limit coconut cultivation as they have emerged in different parts of the world. We developed a multilocus sequence typing scheme (MLST) for tracking epidemics of “Ca. Phytoplasma palmicola,” which is responsible for coconut lethal yellowing disease (CLYD) on the African continent. MLST analysis applied to diseased coconut samples collected in western and eastern African countries also showed the existence of three distinct populations of “Ca. Phytoplasma palmicola” with low intrapopulation diversity. The reasons for the observed strong geographic patterns remain to be established but could result from the lethality of CLYD and the dominance of short-distance insect-mediated transmission.

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