Role of cer-cqu in epicuticular wax biosynthesis

1986 ◽  
Vol 14 (3) ◽  
pp. 576-579 ◽  
Author(s):  
PENNY von WETTSTEIN-KNOWLES
Keyword(s):  
Epicuticular Wax ◽  
Epicuticular Wax Biosynthesis

The Role of Leaf Epicuticular Wax in the Adaptation of Wheat ( Triticum aestivum L.) to High Temperatures and Moisture Deficit Conditions

Crop Science ◽  
2018 ◽  
Vol 58 (2) ◽  
pp. 679-689 ◽  
Author(s):  
Suheb Mohammed ◽  
Trevis D. Huggins ◽  
Francis Beecher ◽  
Chris Chick ◽  
Padma Sengodon ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
High Temperatures ◽  
Triticum Aestivum L ◽  
Epicuticular Wax ◽  
Moisture Deficit ◽  
Leaf Epicuticular Wax

scholarly journals 806 PB 118 CHARACTERIZATION OF BERRY CUTICLE AND EPICUTICULAR WAX OF GRAPE CULTIVARS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 548f-548
Author(s):  
Edward W. Hellman ◽  
Laurel Raines
Keyword(s):  
Fungal Pathogens ◽  
Epicuticular Wax ◽  
First Line ◽  
Grape Berries ◽  
Enhanced Resistance ◽  
Surface Wax ◽  
Epicuticular Wax Layer ◽  
Grape Cultivars

The cuticle and epicuticular wax layer of grape berries provides a first line of defense against fungal pathogens. A relatively thick cuticle and wax layer may result in enhanced resistance to Botrytis cinerea Pers. The structure of epicuticular wax also has been postulated to play a role in Botryris resistance. To examine the role of cuticle and wax in disease resistance, berries of diverse grape cultivars were sampled to quantify the cuticle and wax layers. Wax surface structure was examined by scanning electron microscopy. Significant differences among cultivars were found for both cuticle and wax measurements. Environmental conditions may influence development of these layers, some cultivars had significantly greater cuticle and wax layers in berries that developed in full sunlight. Visual differences in surface wax appearance were apparent among cultivars. Size, density and orientation of wax platelets varied among cultivars.

scholarly journals Quantitative Trait Loci Controlling Amounts and Types of Epicuticular Waxes in Onion

2014 ◽  
Vol 139 (5) ◽  
pp. 597-602 ◽  
Author(s):  
Steven J. Damon ◽  
Michael J. Havey
Keyword(s):  
Insect Pest ◽  
Epicuticular Wax ◽  
Thrips Tabaci ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromosome 2 ◽  
Nucleotide Polymorphisms ◽  
Epicuticular Waxes ◽  
Onion Thrips ◽  
Chromosome 5 ◽  
Epicuticular Wax Biosynthesis

Natural variation exists in onion (Allium cepa L.) for amounts and types of epicuticular waxes on leaves. Wild-type waxy onion possesses copious amounts of these waxes, whereas the foliage of semiglossy and glossy phenotypes accumulates significantly less wax. Reduced amounts of epicuticular waxes have been associated with resistance to onion thrips (Thrips tabaci Lindeman), an important insect pest of onion. A segregating family from the cross of waxy and semiglossy onions was used to map single nucleotide polymorphisms (SNPs) and identify chromosome regions affecting amounts and types of epicuticular waxes as measured by gas chromatography–mass spectrometry. The amount of the primary epicuticular wax on onion leaves, hentriacontanone-16, was controlled by one region on chromosome 5. One region on chromosome 2 affected concentrations of several primary fatty alcohols. Results indicate that the region on chromosome 2 may be associated with the acyl reduction pathway, and the region on chromosome 5 may affect the decarbonylation pathway of epicuticular wax biosynthesis. Because lower amounts of epicuticular waxes are recessively inherited, SNPs tagging regions on chromosomes 2 and 5 will be useful for marker-assisted breeding to vary amounts and types of epicuticular waxes on onion foliage with the goal to develop cultivars resistant to onion thrips.

The role of surface wax in susceptibility of plants to air pollutant injury

1982 ◽  
Vol 60 (4) ◽  
pp. 316-319 ◽  
Author(s):  
Tedmund J. Swiecki ◽  
Anton G. Endress ◽  
O. C. Taylor
Keyword(s):  
Epicuticular Wax ◽  
Air Pollutant ◽  
Plant Sensitivity ◽  
Surface Wax ◽  
Chamber Temperature ◽  
Hcl Gas ◽  
Study Support ◽  
Hcl Concentration ◽  
The Relationship

The relationship between quantity of epicuticular wax and plant sensitivity to hydrogen chloride (HCl) gas was investigated using 8-, 12-, and 16-day-old Phaseolus vulgaris L. plants exposed for 20 min to 27.6 ± 3.9 mg HCl∙m−3. Twelve-day-old plants were more sensitive than 8- or 16-day-old plants and possessed the lowest mean surface wax quantity. Multiple regression analysis showed that surface wax quantity was negatively linearly related to percent of leaves glazed. Necrotic injury was also negatively correlated with surface wax quantity, but to a lesser degree than glazing. Chamber temperature also affected the amount of necrotic injury incurred. Plant age and HCl concentration did not contribute to the observed variation in any of the injury variables in the regression analysis.The results of this study support the hypothesis that cuticular resistance, which is influenced by the amount of epicuticular wax, is a major factor influencing leaf glazing due to gaseous HCl. Since necrotic injury was affected by both surface wax quantity and chamber temperature, the incidence and severity of necrotic injury may be controlled by both cuticular and stomatal resistances.

RELATIONSHIP BETWEEN EPICUTICULAR WAX AND BLACKSPOT CAUSED BY ALTERNARIA BRASSICAE IN THREE LINES OF RAPESEED

1976 ◽  
Vol 56 (4) ◽  
pp. 781-785 ◽  
Author(s):  
J. P. TEWARI ◽  
W. P. SKOROPAD
Keyword(s):  
Partial Resistance ◽  
Leaf Surface ◽  
Epicuticular Wax ◽  
Water Repellent ◽  
Minimal Amount ◽  
Alternaria Brassicae ◽  
Brassica Napus L ◽  
Physical Role ◽  
Wax Crystals

The physical role of epicuticular wax in rapeseed in conferring resistance to Alternaria brassicae (Berk.) Sacc. has been investigated using the adaxial surface of the upper leaves of three lines of rapeseed. The lines of rapeseed were selected to offer a range of bloom and degrees of resistance to A. brassicae. Scanning electron microscopy revealed that epicuticular wax is organized in two layers. The distal layer is fluffy and consists of cylindrical wax crystals, while the proximal layer has plate-like wax crystals. The distal layer is thicker in the Iowa line (Brassica napus L.) than in the cv. Midas (B. napus), while the proximal layer is almost similar in the two cultivars. Torch (B. campestris L.) has only a minimal amount of wax. Wiping of the leaves with cotton wool removes the fluffy wax layer. The amount of wax per cm2 of the leaf surface is maximum in the Iowa line, followed by that in Midas and Torch. The contact angle of water droplets is significantly reduced and retention of conidia and development of blackspots caused by A. brassicae are significantly increased upon wiping of the leaves in Iowa line and Midas but not in Torch. It is concluded that the bloom in rapeseed confers partial resistance to A. brassicae by providing a water-repellent surface.

scholarly journals Changes in Cuticle Components and Morphology of ‘Satsuma’ Mandarin (Citrus unshiu) during Ambient Storage and Their Potential Role on Penicillium digitatum Infection

Molecules ◽  
2020 ◽  
Vol 25 (2) ◽  
pp. 412 ◽  
Author(s):  
Shenghua Ding ◽  
Jing Zhang ◽  
Lvzhu Yang ◽  
Xinyu Wang ◽  
Fuhua Fu ◽  
...  
Keyword(s):  
Fungal Infection ◽  
Storage Time ◽  
Epicuticular Wax ◽  
Penicillium Digitatum ◽  
In Vitro Tests ◽  
Satsuma Mandarin ◽  
C Storage ◽  
Ambient Storage

To elucidate the role of fruit cuticle in fungal infection, changes in cuticle composition and morphology of ‘Satsuma’ mandarin during ambient (at 25 °C) storage and their role in Penicillium digitatum infection were investigated. Results showed that the epicuticular wax yield increased from 1.11 μg cm−2 to 4.21 μg cm−2 during storage for 20 days and then decreased to 1.35 μg cm−2 as storage time prolonged to 40 days. Intracuticular wax content of fruits stored for 20 days showed a peak value that was 1.7-fold higher than that of fruits stored for 40 days. The contents of cutin monomers of fruits showed a decreased trend during storage, while their proportions in the cutin stayed stable. Acids were identified as the most abundant components in epicuticular wax independently of the storage time, followed by alkanes and terpenoids. Terpenoids were found as the predominant components in intracuticular wax during the whole storage, followed by alkanes and acids. The flattened platelets crystals of fruits at harvest changed into small granule-like wax ones after 10 days of storage then gradually distributed across the surface of the fruits as stored for 40 days. Results of in vitro tests showed that mycelial growth of Penicillium digitatum could be promoted by epicuticular wax and conidial germination could be inhibited by cutin at different storage stages. These results shed new light on the chemical basis for cuticle involvement in fungal infection.

Role of Leaf Epicuticular Wax Load and Composition against Whitefly Population and Cotton Leaf Curl Virus in Different Cotton Varieties

2020 ◽  
Vol 54 (5) ◽  
pp. 472-486
Author(s):  
Muhammad Umair Majid ◽  
Zunaira Sher ◽  
Bushra Rashid ◽  
Qurban Ali ◽  
Muhammad Bilal Sarwar ◽  
...  
Keyword(s):  
Epicuticular Wax ◽  
Cotton Leaf ◽  
Whitefly Population ◽  
Cotton Leaf Curl Virus ◽  
Leaf Epicuticular Wax ◽  
Leaf Curl Virus ◽  
Wax Load ◽  
Leaf Curl
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