The responses of trichome mutants to enhanced ultraviolet-B radiation in Arabidopsis thaliana

An, Yan; Pan, Jianbin; An, Lizhe; Gan, Yinbo; Feng, Hao

doi:10.1016/j.jphotobiol.2012.04.011

Cited by 96 publications

(79 citation statements)

References 38 publications

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“…Trichomes, indeed, play a role in the UV stress response, and their density is increased in plants exposed to UV-B (Yan et al, 2012). UV-B-induced trichome cell wall thickening is in accordance with these results.…”

Section: Role Of the Or And The Autofluorescent Secondary Cell Wall Lsupporting

confidence: 84%

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Cell Wall Maturation of Arabidopsis Trichomes Is Dependent on Exocyst Subunit EXO70H4 and Involves Callose Deposition

et al. 2015

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Arabidopsis (Arabidopsis thaliana) leaf trichomes are single-cell structures with a well-studied development, but little is understood about their function. Developmental studies focused mainly on the early shaping stages, and little attention has been paid to the maturation stage. We focused on the EXO70H4 exocyst subunit, one of the most up-regulated genes in the mature trichome. We uncovered EXO70H4-dependent development of the secondary cell wall layer, highly autofluorescent and callose rich, deposited only in the upper part of the trichome. The boundary is formed between the apical and the basal parts of mature trichome by a callose ring that is also deposited in an EXO70H4-dependent manner. We call this structure the Ortmannian ring (OR). Both the secondary cell wall layer and the OR are absent in the exo70H4 mutants. Ecophysiological aspects of the trichome cell wall thickening include interference with antiherbivore defense and heavy metal accumulation. Ultraviolet B light induces EXO70H4 transcription in a CONSTITUTIVE PHOTOMORPHOGENIC1-dependent way, resulting in stimulation of trichome cell wall thickening and the OR biogenesis. EXO70H4-dependent trichome cell wall hardening is a unique phenomenon, which may be conserved among a variety of the land plants. Our analyses support a concept that Arabidopsis trichome is an excellent model to study molecular mechanisms of secondary cell wall deposition.

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Section: Role Of the Or And The Autofluorescent Secondary Cell Wall Lsupporting

confidence: 84%

“…Arabidopsis trichomes functions are mostly associated with herbivore defense and UV protection (Yan et al, 2012). Corresponding with this, it was indicated that EXO70H4 is up-regulated by UV-B irradiation in a CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1)-dependent manner (Oravecz et al, 2006) and that it is down-regulated by methyl jasmonate (MeJA; Hruz et al, 2008).…”

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confidence: 93%

Cell Wall Maturation of Arabidopsis Trichomes Is Dependent on Exocyst Subunit EXO70H4 and Involves Callose Deposition

et al. 2015

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“…The functions of trichomes are dependent on the trichome type and its location (Wagner et al 2004), and their density may evolve in response to a variation in several environmental factors. Trichomes also play an important role in maintaining plant function upon exposure to environmental stress (Yan et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Micromorphology, histochemistry and ultrastructure of the foliar trichomes of Withania somnifera (L.) Dunal (Solanaceae)

Munien

Naidoo

2015

Planta

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The leaves of Withania somnifera contained four morphologically distinct trichome types: glandular capitate, non-glandular dendritic (branched), non-glandular bicellular and non-glandular multicellular trichomes. Major phytochemical compounds present within glandular and non-glandular trichomes were alkaloids and phenolic compounds. The aim of this study was to characterize the micromorphology of the foliar trichomes of Withania somnifera as well as to elucidate the location and composition of the secretory products. Trichome density and length was also determined in three developmental stages of the leaves. Light microscopy and scanning electron microscopy showed the presence of four morphologically distinct trichome types: glandular capitate, non-glandular dendritic, non-glandular bicellular and non-glandular multicellular. The dendritic trichomes exhibited cuticular warts which are involved in the "Lotus-Effect". Glandular capitate and non-glandular dendritic trichomes were aggregated on the mid-vein of young and mature leaves, possibly to protect underlying vasculature. Histochemical staining also revealed the presence of two major classes of phytochemical compounds that are of medicinal importance, i.e. alkaloids and phenolic compounds. These compounds are used to treat a wide variety of ailments and also act as chemical deterrents in plants. The results of this study explain possible roles of four morphologically distinct trichome types based on their morphology, foliar distribution and content.

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“…1). As we known, fungi and bacteria are generally more sensitive to damage by UV-B radiation in direct sunlight than are plants (Braga et al 2001;Mühlenberg and Stadler 2005;Yan et al 2012), however, sunlight scarcely penetrates the soil surface (Aucamp 2007;Avery et al 2004), less than 0.3 % of light is transmitted through to 2 mm soil depth (Jeffery et al 2009). So the bacteria may receive the direct effects of UV-B radiation scarcely.…”

Section: Discussionmentioning

confidence: 99%

“…Numerous studies reported the effects of UV-B on various living organisms and the majority focused on the response of plants to UV-B radiation (Robinson et al 2005;Ruhland et al 2005;Searles et al 2001;Xiong and Day 2001;Yan et al 2012), which were grown indoor, greenhouse or chamber particularly. Recently, an increasing number of researches on animals (Robson et al 2005;Bao et al 2013) and microorganisms (Avery et al 2004;Piccini et al 2009;Rinnan et al 2005;Zaller et al 2002) have been reported.…”

Section: Introductionmentioning

confidence: 99%

Effects of enhanced UV-B radiation on the diversity and activity of soil microorganism of alpine meadow ecosystem in Qinghai–Tibet Plateau

Niu

Zhang

et al. 2014

Ecotoxicology

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The effects of enhanced UV-B radiation on abundance, community composition and the total microbial activity of soil bacteria in alpine meadow ecosystem of Qinghai-Tibet Plateau were investigated. Traditional counting and 16S rRNA gene sequencing were used to investigate the culturable bacteria and their composition in soil, meanwhile the total microbial activity was measured by microcalorimetry. The population of soil culturable bacteria was slightly reduced with the enhanced UV-B radiation in both of the two depths, 2.46 × 10(6) CFU/g in upper layer (0-10 cm), 1.44 × 10(6) CFU/g in under layer (10-20 cm), comparing with the control (2.94 × 10(6) CFU/g in upper layer, 1.65 × 10(6) CFU/g in under layer), although the difference was not statistically significant (P > 0.05). However, the bacteria diversity decreased obviously due to enhanced UV-B, the number of species for upper layer was decreased from 20 to 13, and from 16 to 13 for the lower layer. The distribution of species was also quite different between the two layers. Another obvious decrease induced by enhanced UV-B radiation was in the total soil microbial activities, which was represented by the microbial growth rate constant (k) in this study. The results indicated that the culturable bacteria community composition and the total activity of soil microbes have been considerably changed by the enhanced UV-B radiation.

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The responses of trichome mutants to enhanced ultraviolet-B radiation in Arabidopsis thaliana

Cited by 96 publications

References 38 publications

Cell Wall Maturation of Arabidopsis Trichomes Is Dependent on Exocyst Subunit EXO70H4 and Involves Callose Deposition

Cell Wall Maturation of Arabidopsis Trichomes Is Dependent on Exocyst Subunit EXO70H4 and Involves Callose Deposition

Micromorphology, histochemistry and ultrastructure of the foliar trichomes of Withania somnifera (L.) Dunal (Solanaceae)

Effects of enhanced UV-B radiation on the diversity and activity of soil microorganism of alpine meadow ecosystem in Qinghai–Tibet Plateau

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