scholarly journals Glandular Hairs of Sigesbeckia jorullensis Kunth (Asteraceae): Morphology, Histochemistry and Composition of Essential Oil

2002 ◽  
Vol 89 (4) ◽  
pp. 459-469 ◽  
Author(s):  
G. HEINRICH
Keyword(s):  
Essential Oil ◽  
Glandular Hairs

scholarly journals Effect of salicylic acid foliar application on growth, glandular hairs and essential oil yield in Salvia officinalis L. grown under zinc stress

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Fatima Zohra Es-sbihi ◽  
Zakaria Hazzoumi ◽  
Khalid Amrani Joutei
Keyword(s):  
Salicylic Acid ◽  
Essential Oil ◽  
Foliar Application ◽  
Essential Element ◽  
Salvia Officinalis ◽  
Oil Yield ◽  
Glandular Hairs ◽  
Positive Effects ◽  
Essential Oil Yield ◽  
Zn Stress

Abstract Background Generally, zinc (Zn) is an essential element and acts as a plant nutrient, but at higher concentrations, it is toxic. Higher uptake and translocation of Zn into plant tissues can cause serious physiological and biochemical alterations. However, salicylic acid (SA) is an endogenous regulator of growth and signaling molecule responsible for inducing environmental stress tolerance in plants. Therefore, spray application of SA could provide protection against several types of stresses such as Zn toxicity. In this context, the ameliorative effect of SA (0.5 and 1 mM) on Salvia officinalis L. under Zn stress (40 mM) was studied. Results Zn stress decreased growth, chlorophyll content, essential oil yield and peltate glandular trichome density. This toxicity can be linked to a strong accumulation of Zn in the various parts of the plant. In addition, Zn stress disturbed nutrients assimilation (K, P and Ca). However, spray of SA, particularly at 0.5 mM improved all parameters studied under both Zn and normal conditions. The positive effects of SA under Zn stress condition may be due to the decrease of Zn accumulation in different parts of the plant. This decrease was accompanied by an increase in K, P and Ca content. In addition, the histological study of S. officinalis leaves showed the presence of two types of glandular hairs, the peltate and capitate glands. In the leaves of stressed plants, we noticed the presence of glands with deformations in the form of pockets in the number of one or more as well as the glands with an oval form. On the other hand, all these abnormalities glands were not detected in stressed plants that were sprayed with SA. Therefore, the absence of these anomalies under the effect of SA showed the remedial effect of this growth regulator. Conclusion The findings of the present work suggest that spraying SA maybe useful for improving the plant growth in Zn-contaminated areas.

scholarly journals Glandular and non-glandular hairs in the seasonally dimorphic Origanum dictamnus L. (Lamiaceae) as a means of adaptation to cold stress

2014 ◽  
Vol 67 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Artemios M. Bosabalidis ◽  
Thomas Sawidis
Keyword(s):  
Essential Oil ◽  
Cold Stress ◽  
Epidermal Cell ◽  
Low Temperatures ◽  
Antioxidant Properties ◽  
Apical Region ◽  
Glandular Hairs ◽  
Leaf Mesophyll ◽  
Hydrophilic Material ◽  
Lateral Branches

<em>Origanum dictamnus</em> is a seasonally dimorphic plant having different appearance in winter and summer. Shoots of winter plants are leaf-naked except for their apical region which bears a cluster of small leaves covered with a thick indumentum of non-glandular hairs. This indumentum highly contributes to the avoidance of cold penetration into the leaf mesophyll, allowing thus plants to endure winter low temperatures. Shoots of summer plants are vigorous with large green leaves. Non-glandular hairs are dendroid with a 5-celled vertical stub and several lateral branches. Glandular hairs are of two types, large peltate hairs and small capitate hairs. Peltate hairs are numerous and consist of a 12-celled head, a unicellular stalk, and a basal epidermal cell.. They constitute the sites of essential oil secretion. Capitate hairs occur in a small number and are composed of a unicellular head, a unicellular stalk and a basal epidermal cell. They are not secreting essential oil, but a hydrophilic material. The oil secreted by the peltate hairs has antioxidant properties, opposes the oxidative stress resulted from low temperatures, and contributes to the adaptation of the plant to winter cold stress.

scholarly journals Essential Oil and Glandular Hairs: Diversity and Roles

2020 ◽  
Author(s):  
Zakaria Hazzoumi ◽  
Youssef Moustakime ◽  
Khalid Amrani Joutei
Keyword(s):  
Essential Oil ◽  
Glandular Hairs

Glandular Hairs, Secretory Cavities, and the Essential Oil in the Leaves of Tarragon (Artemisia dracunculusL.)

1994 ◽  
Vol 2 (3) ◽  
pp. 19-32 ◽  
Author(s):  
Ella Werker ◽  
E. Putievsky ◽  
U. Ravid ◽  
N. Dudai ◽  
Irena Katzir
Keyword(s):  
Essential Oil ◽  
Glandular Hairs ◽  
Secretory Cavities
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