Trichomes related to an unusual method of water retention and protection of the stem apex in an arid zone perennial species

Lusa, Makeli Garibotti; Cardoso, Elizabeth; Machado, Sílvia Rodrigues; Appezzato‐da‐Glória, Beatriz

doi:10.1093/aobpla/plu088

Cited by 27 publications

(17 citation statements)

References 34 publications

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“…Numerous studies have shown plant trichomes are involved in water protection, absorbing UV radiation, and attracting pollinators by releasing specific chemicals (Skaltsa et al, 1994 ; Moraes et al, 1998 ; Paré and Tumlinson, 1999 ; Benz and Martin, 2006 ; Lusa et al, 2014 ). However, the most notable function of plant trichomes is their role in plant defense.…”

Section: Introductionmentioning

confidence: 99%

Genetic Architecture of Capitate Glandular Trichome Density in Florets of Domesticated Sunflower (Helianthus annuus L.)

et al. 2018

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Capitate glandular trichomes (CGT), one type of glandular trichomes, are most common in Asteraceae species. CGT can produce various secondary metabolites such as sesquiterpene lactones (STLs) and provide durable resistance to insect pests. In sunflower, CGT-based host resistance is effective to combat the specialist pest, sunflower moth. However, the genetic basis of CGT density is not well understood in sunflower. In this study, we identified two major QTL controlling CGT density in sunflower florets by using a F4 mapping population derived from the cross HA 300 × RHA 464 with a genetic linkage map constructed from genotyping-by-sequencing data and composed of 2121 SNP markers. One major QTL is located on chromosome 5, which explained 11.61% of the observed phenotypic variation, and the second QTL is located on chromosome 6, which explained 14.06% of the observed phenotypic variation. The QTL effects and the association between CGT density and QTL support interval were confirmed in a validation population which included 39 sunflower inbred lines with diverse genetic backgrounds. We also identified two strong candidate genes in the QTL support intervals, and the functions of their orthologs in other plant species suggested their potential roles in regulating capitate glandular trichome density in sunflower. Our results provide valuable information to sunflower breeding community for developing host resistance to sunflower insect pests.

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Section: Introductionmentioning

confidence: 99%

Genetic Architecture of Capitate Glandular Trichome Density in Florets of Domesticated Sunflower (Helianthus annuus L.)

et al. 2018

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“…Lychnophorinae are one of the most representative subtribes of Vernonieae in Brazil (Keeley & Robinson, ), comprising 18 genera and 104 species including shrubs, subshrubs, trees and treelets, which are nearly all restricted to the Cerrado Domain, occurring predominantly in campos rupestres (Loeuille et al ., ) and exhibiting morphological and anatomical adaptations to these arid zones (Lusa et al ., , ). Findings of recent phylogenetic analysis for Lychnophorinae based on molecular and morphological data show that the subtribe is monophyletic (Loeuille, Keeley & Pirani, ).…”

Section: Introductionmentioning

confidence: 99%

Histolocalization of chemotaxonomic markers in Brazilian Vernonieae (Asteraceae)

2016

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Vernonieae are well represented in South America by subtribe Lychnophorinae, with 104 Brazilian species, some of them rare and endangered. Lychnophorinae are well known for producing metabolites of high pharmaceutical and chemotaxonomic value. Despite the importance of secondary metabolites in Lychnophorinae, there is still little evidence regarding the secretory structures responsible for producing these compounds. Therefore, in this study we investigated 15 species representative of the main lineages of Lychnophorinae, with the following objectives: to identify where the chemotaxonomic markers of Lychnophorinae are secreted and stored and in which developmental stage of the organ these metabolites are found. Samples of stems and leaves were processed according to the usual techniques in plant anatomy. It was found that the main sites of secondary metabolite biosynthesis are glandular trichomes, epidermal cells and parenchyma tissues. Metabolites from glandular trichomes, especially sesquiterpene lactones (STL), are prevalent in the early developmental stages of organs. The metabolite compounds stored in parenchyma tissues are mainly terpenoids, flavonoids and other phenolic compounds; young and expanded leaves are equally rich in metabolites. Thus, the information obtained in this study is essential for conducting chemotaxonomic studies in this group, helping to promote selective collection and conservation of species.

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“…They produce hydrophilic substances that help to retain water, thereby preventing drying out and promoting the growth of young organs. This hyaline material contained mainly carbohydrates derived from the partial degradation of the trichome cell wall (Lusa et al 2015). The secretion of colleters on the surface of buds and floral elements protects against water loss as well (Mayer et al 2013).…”

Section: Micromorphologymentioning

confidence: 99%

“…The secretion of colleters on the surface of buds and floral elements protects against water loss as well (Mayer et al 2013). Some glandular trichomes provide food for pollinators (Pansarin and Maciel 2017), while others secrete terpenoids, phenolic compounds, and insect-repellent proteins (Lusa et al 2015). Accumulation of e.g.…”

Section: Micromorphologymentioning

confidence: 99%

Histochemical assays of secretory trichomes and the structure and content of mineral nutrients in Rubus idaeus L. leaves

Chwil

Kostryco

2019

Protoplasma

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Leaves of Rubus idaeus are a raw material, ingredients of herbal blend, and a source of antioxidants. There are no data concerning histochemistry of trichomes, and little is known about the leaf structure of this species. The aim of this study was to determine the histochemistry of active compounds and the structure of glandular trichomes, micromorphology, anatomy, and ultrastructure of leaves as well as content of elements. To determine the histochemistry of glandular trichomes, different chemical compounds were used. The leaf structure was analysed using light, scanning, and transmission electron microscopes. The content of elements was determined with atomic absorption spectrometry, and the microanalysis of the epidermis ultrastructure was carried out with a transmission electron microscope equipped with a digital X-ray analyser. In glandular trichomes, polyphenols, terpenes, lipids, proteins, and carbohydrates were identified. The main elements in the ultrastructure of the epidermis were Na, Mo, Se, Ca, and Mg. In dry matter of leaves, K, Mg, Ca, P, and Fe were dominant. Infusions from leaves are safe for health in terms of the Cd and Pb concentrations. Leaves can be a valuable raw material. Non-glandular trichomes prevent clumping of mixed raw materials in herbal mixtures.

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Trichomes related to an unusual method of water retention and protection of the stem apex in an arid zone perennial species

Cited by 27 publications

References 34 publications

Genetic Architecture of Capitate Glandular Trichome Density in Florets of Domesticated Sunflower (Helianthus annuus L.)

Genetic Architecture of Capitate Glandular Trichome Density in Florets of Domesticated Sunflower (Helianthus annuus L.)

Histolocalization of chemotaxonomic markers in Brazilian Vernonieae (Asteraceae)

Histochemical assays of secretory trichomes and the structure and content of mineral nutrients in Rubus idaeus L. leaves

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