Effect of Drought Stress on the Yield and Composition of Volatile Oils of Drought-Tolerant and Non-Drought-Tolerant Clones of Tagetes minuta

Abstract

A drought-tolerant clone of Tagetes minuta L. (Asteraceae) was selected in vitro on a medium containing 60 mM mannitol. In the greenhouse, a decrease in soil field capacity (FC) from 100 to 40 % reduced oil yield by 49, 71 and 71 % for drought-tolerant, non-drought tolerant cloned and seed-grown plants, respectively. In soil at 40 % FC, the drought-tolerant clone had the highest leaf dry weight and oil yield. At 100 % FC, there was no significant difference in leaf dry weight, but the drought-tolerant clone had a significantly higher percentage oil content and yield than seed-grown plants. The main components of the oil were monoterpenes of which trans- and cis-tagetone together were 52.3 % - 64.2 %. Drought significantly altered the content of some oil components.

Effects of Pot Size on Leaf Production and Essential Oil Content and Composition ofEucalyptus citriodorahook. (Lemon-Scented Gum)

“…The type of stress (21) and stress level (1,24,26,27) have both been shown to affect the essential oil content. Some studies have also noted differences in the composition of the essential oil under stress (19,20). Other factors influencing the essential oil content include the plant genotype (7,12) and the stage of development of the leaf (8,11).…”

Tagetes spp. Essential Oils and Other Extracts: Chemical Characterization and Biological Activity

“…Another EO from Egypt [ 89 ] was dominated by ( E )- and ( Z )-tagetone, which together accounted for 52.3–64.2% of the EO, which also contained limonene (18.2%), spathulenol (6.9%), dihydrotagetone (5.9%), linalol (5.9%), α-gurjunene (2.3%), sabinene (2.3%), longifolene (2.2%), terpinen-4-ol (1.4%), and β-caryophyllene (1.2%). On the other hand, an EO from Yemen [ 90 ] was characterized by ( Z )-tagetenone (15.9%) and ( E )-tagetenone (34.8%), and secondarily by ( Z )-β-ocimene (8.3%), limonene (2.3%), ( Z )-tagetone (1.8%), dihydrotagetone (1.4%), and a dimethylvinylketone derivative (20.6%).…”

Antibacterial activity of Tagetes minuta L. (Asteraceae) essential oil with different chemical composition

“…[6][7][8][9][10] GC/ MS analysis of T. minuta oils indicates that plant organ, stage of growth, latitude and methods of extraction all affect the composition of oil. [11][12][13][14][15] The effect of drought stress on the yield and composition of volatile oils of clones of commercially available T. minuta grown in a greenhouse in the UK 16 has also been reported. In the present paper the composition and the antibacterial activity of the essential oil from T. minuta grown in Europe and Africa is reported.…”