Light-dependent formation of glandular trichomes and monoterpenes in thyme seedlings

Yamaura, Takao; Tanaka, Shigeo; Tabata, Minoru

doi:10.1016/0031-9422(89)80106-2

Cited by 57 publications

(20 citation statements)

References 10 publications

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“…Higher light intensity and duration usually promote terpene accumulation (8,16), and cool nights have been found to increase monoterpene concentration in peppermint (Mentha piperita L.) before flowering (12). Monoterpene concentrations are generally higher in young leaves and peak at or before flowering (3,12), with increased rates of catabolism at the time of flowering (4,5).…”

Section: Resultsmentioning

confidence: 99%

Temperature and Photoperiod Influence Trichome Density and Sesquiterpene Content of Lycopersicon hirsutum f. hirsutum

Gianfagna¹,

Carter²,

Sacalis³

1992

Plant Physiol.

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Resistance to Colorado potato beetle in a clone of Lycopersicon hirsutum f. hirsutum L. is attributed to the presence of the sesquiterpene zingiberene in the type VI leaf trichomes; however, both day/night temperature regimen and photoperiod affect zingiberene content and trichome density. In short days (SD), zingiberene content per trichome is more than 3-fold greater than in long days. In SD, trichome density per unit leaf surface is 2-fold greater at 25/20°C (day/night) than at either 30/25°C or 20/15°C, thus indirectly influencing zingiberene content per cm2. In long days, temperature regimen had little effect on either trichome density or zingiberene content, although trichome density was greater than or equal to that in SD.Glandular trichomes that accumulate large quantities of terpenes and other essential oils have been found to be associated with insect resistance in a number of species of tomato (6,11,13). Lycopersicon hirsutum f. hirsutum Humb. and Bonpl. is resistant to several arthropod pests, including the Colorado potato beetle (Leptinotarsa decemlineata Say), although the degree of resistance may vary in different environments and with different genetic backgrounds. Resistance to this pest has been associated with the presence of type VI trichomes, capitate glandular hairs, 0.2 to 0.5 mm long, which contain a four-celled head. The secretory head cells of the type VI trichomes from resistant genotypes contain high amounts of the sesquiterpene zingiberene (2, 9). Because L. esculentum contains type VI trichomes and can be successfully crossed with L. hirsutum, it may be possible to transfer this trait. To better understand the effect of environment on trichome density, zingiberene content, and insect resistance, the following research was undertaken to determine whether temperature and photoperiod modify the expression of the genes for type VI trichomes and zingiberene production.

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Section: Resultsmentioning

confidence: 99%

Temperature and Photoperiod Influence Trichome Density and Sesquiterpene Content of Lycopersicon hirsutum f. hirsutum

Gianfagna¹,

Carter²,

Sacalis³

1992

Plant Physiol.

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“…In drier environments, the density of trichomes on leaves can be higher than in plants of the same species growing in wetter situations (Pérez-Estrada et al 2000). Similarly, light intensity can positively influence the glandular trichomes (Pérez-Estrada et al 2000, Yamaura et al 1989). According to Pérez-Estrada et al (2000), in addition to playing a defensive role against biotic agents, glandular trichomes can help to reflect sunlight and minimize water loss.…”

Section: Discussionmentioning

confidence: 99%

Glandular trichome density and essential oil composition in leaves and inflorescences of Lippia origanoides Kunth (Verbenaceae) in the Brazilian Cerrado

Tozin

Marques

Rodrigues

2015

An. Acad. Bras. Ciênc.

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The essential oils from leaves and inflorescences of Lippia origanoides Kunth present aromatic and medicinal potential and have been used to treat several diseases, including melanoma. In Brazil, L. origanoides is commonly found in campo cerrado and cerrado stricto sensu, physiognomies featured mainly by the differential light conditions to which short and medium-sized plants are subjected. Our aim was to investigate the glandular trichome density and the yield and chemical composition of the essential oils in leaves and inflorescences of L. origanoides from campo cerrado and cerrado stricto sensu. For glandular density analysis, leaves and inflorescences were processed according to conventional techniques for scanning electron microscopy. The essential oils of leaves and inflorescences were obtained by hydrodistillation and identified with gas chromatography. Bracts and sepals showed the highest glandular density, followed by petals and leaves. The glandular density in the abaxial leaf surface was higher in individuals from the campo cerrado. In both populations the essential oil yield was higher in inflorescences than in leaves. The chemical composition of the essential oils varied among individuals from different areas and inside a same population. Our results demonstrated the chemical plasticity of L. origanoides suggesting the importance of monitoring its popular use.

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“…Foi demonstrado, por ex., que no manjericão (Ocimum basilicum) e no tomilho (Thymus vulgaris), duas plantas utilizadas na medicina popular e como condimentos, o completo desenvolvimento de tricomas glandulares, onde os óleos essenciais são armazenados, é luz-dependente 123,126 .…”

Section: Radiação Ultravioletaunclassified

Plantas medicinais: fatores de influência no conteúdo de metabólitos secundários

Gobbo‐Neto¹,

Lopes²

2007

Quím. Nova

921

364

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. do Café, s/n, 14040-903 Ribeirão Preto -SP, BrasilRecebido em 7/7/05; aceito em 11/4/06; publicado na web em 31/10/06 MEDICINAL PLANTS: FACTORS OF INFLUENCE ON THE CONTENT OF SECONDARY METABOLITES. Since secondary metabolites represent a chemical interface between plants and surrounding environment, their syntheses are frequently affected by environmental conditions. Thus, variations in the total content and/or of the relative proportions of secondary metabolites in plants can take place. We review the main environmental factors that can streamline or alter the production or concentration of secondary metabolites in plants. How seasonality, circadian rhythm, developmental stage and age, temperature, water availability, UV radiation, soil nutrients, altitude, atmospheric composition and tissue damage influence secondary metabolism are discussed.Keywords: variations in secondary metabolites; medicinal plants; chemical ecology. INTRODUÇÃODesde o quarto século a.C. existem relatos de normas para a coleta de plantas medicinais. Os carrascos gregos, por ex., coletavam suas amostras do veneno cicuta (Conium maculatum) pela manhã, quando os níveis de coniina são maiores 1,2 . Variações temporais e espaciais no conteúdo total, bem como as proporções relativas de metabólitos secundários em plantas ocorrem em diferentes níveis (sazonais e diárias; intraplanta, inter-e intraespecífica) e, apesar da existência de um controle genético, a expressão pode sofrer modificações resultantes da interação de processos bioquímicos, fisiológicos, ecológicos e evolutivos 3-7 . De fato, os metabólitos secundários representam uma interface química entre as plantas e o ambiente circundante, portanto, sua síntese é freqüentemente afetada por condições ambientais 8 .Os principais fatores que podem coordenar ou alterar a taxa de produção de metabólitos secundários estão expostos a seguir. Deve ser enfatizado, porém, que os estudos sobre influência destes fatores na produção de metabólitos secundários geralmente têm se limitado a um grupo restrito de espécies, predominantemente ocorrentes em regiões temperadas, muitas das quais são comercialmente importantes e podem ter sofrido fortes pressões seletivas antrópicas visando certas características desejadas. Seu comportamento, portanto, nem sempre é representativo de plantas selvagens ou de outros tipos de habitat.Também deve ser ressaltado que, muitas vezes, as variações podem ser decorrentes do desenvolvimento foliar e/ou surgimento de novos órgãos concomitante a uma constância no conteúdo total de metabólitos secundários. Isto pode levar à menor concentração destes metabólitos por diluição, podendo, no entanto, resultar em maior quantidade total, devido ao aumento de biomassa 9,10 . Além disso, alguns dos fatores discutidos apresentam correlações entre si e não atuam isoladamente, podendo influir em conjunto no metabolismo secundário, como por ex.: desenvolvimento e sazonalidade; índice pluviométrico e sazonalidade; temperatura e altitude, entre outros. FATORES QUE INFLUENCIAM O CONTEÚDO DE M...

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Light-dependent formation of glandular trichomes and monoterpenes in thyme seedlings

Cited by 57 publications

References 10 publications

Temperature and Photoperiod Influence Trichome Density and Sesquiterpene Content of Lycopersicon hirsutum f. hirsutum

Temperature and Photoperiod Influence Trichome Density and Sesquiterpene Content of Lycopersicon hirsutum f. hirsutum

Glandular trichome density and essential oil composition in leaves and inflorescences of Lippia origanoides Kunth (Verbenaceae) in the Brazilian Cerrado

Plantas medicinais: fatores de influência no conteúdo de metabólitos secundários

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