Trichome morphology provides phylogenetically informative signal for generic delimitation in tribe Marrubieae (Lamiaceae)

1992 ◽

Vol 50 (1) ◽

pp. 840-841

Author(s):

Kyle T. Thornham ◽

R. Jay Stipes ◽

Randolph L. Grayson

Keyword(s):

Acid Deposition ◽

Disease Incidence ◽

Natural Populations ◽

Tree Disease ◽

Flowering Dogwood ◽

Discula Destructiva ◽

Disease Induction ◽

Dogwood Anthracnose ◽

Trichome Morphology ◽

Precipitation Events

Dogwood anthracnose, caused by Discula destructiva (1), is another new catastrophic tree disease that has ravaged natural populations of the flowering dogwood (Cornus florida) in the Appalachians over the past 15 years, and the epidemic is prognosticated to continue (2). An estimated 9.5 million acres have been affected, primarily in the Appalachian Mountains, from VA southwards, alone, and an estimated 50% of all dogwoods in PA have been killed. Since acid deposition has been linked experimentally with disease induction, and since the disease incidence and severity are more pronounced at higher elevations where lower pH precipitation events occur, we investigated the effect of acidic foliar sprays on moiphologic changes in the foliar cuticle and trichomes (3), the initial sites of infection and foci of Discula sporulation.

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Trichome morphology relates to taxonomic diversity in Monardella (Lamiaceae) in the lower Snake River Watershed of Idaho and Oregon, USA: Taxonomic studies in Monardella (Lamiaceae) VI

The Journal of the Torrey Botanical Society ◽

10.3159/torrey-d-18-00059.1 ◽

2019 ◽

Vol 146 (4) ◽

pp. 299 ◽

Cited By ~ 1

Author(s):

Mark A. Elvin ◽

Ronald B. Kelley ◽

Bryan T. Drew

Keyword(s):

Taxonomic Diversity ◽

Snake River ◽

River Watershed ◽

Taxonomic Studies ◽

Trichome Morphology

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The Foreign Exchange Quoting Activity as an Informative Signal

SSRN Electronic Journal ◽

10.2139/ssrn.488724 ◽

2004 ◽

Author(s):

Walid Ben Omrane ◽

Andréas Heinen

Keyword(s):

Foreign Exchange ◽

Informative Signal

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Introgression of the sesquiterpene biosynthesis from Solanum habrochaites to cultivated tomato offers insights into trichome morphology and arthropod resistance

Planta ◽

10.1007/s00425-021-03651-y ◽

2021 ◽

Vol 254 (1) ◽

Author(s):

Rodrigo Therezan ◽

Ruy Kortbeek ◽

Eloisa Vendemiatti ◽

Saioa Legarrea ◽

Severino M. de Alencar ◽

...

Keyword(s):

Glandular Trichomes ◽

Pest Resistance ◽

Chromosome 8 ◽

Cavity Size ◽

Solanum Habrochaites ◽

Genetic Components ◽

Internal Storage ◽

In The Wild ◽

Low Levels ◽

Trichome Morphology

Abstract Main conclusion Cultivated tomatoes harboring the plastid-derived sesquiterpenes from S. habrochaites have altered type-VI trichome morphology and unveil additional genetic components necessary for piercing-sucking pest resistance. Abstract Arthropod resistance in the tomato wild relative Solanum habrochaites LA1777 is linked to specific sesquiterpene biosynthesis. The Sesquiterpene synthase 2 (SsT2) gene cluster on LA1777 chromosome 8 controls plastid-derived sesquiterpene synthesis. The main genes at SsT2 are Z-prenyltransferase (zFPS) and Santalene and Bergamotene Synthase (SBS), which produce α-santalene, β-bergamotene, and α-bergamotene in LA1777 round-shaped type-VI glandular trichomes. Cultivated tomatoes have mushroom-shaped type-VI trichomes with much smaller glands that contain low levels of monoterpenes and cytosolic-derived sesquiterpenes, not presenting the same pest resistance as in LA1777. We successfully transferred zFPS and SBS from LA1777 to cultivated tomato (cv. Micro-Tom, MT) by a backcrossing approach. The trichomes of the MT-Sst2 introgressed line produced high levels of the plastid-derived sesquiterpenes. The type-VI trichome internal storage-cavity size increased in MT-Sst2, probably as an effect of the increased amount of sesquiterpenes, although it was not enough to mimic the round-shaped LA1777 trichomes. The presence of high amounts of plastid-derived sesquiterpenes was also not sufficient to confer resistance to various tomato piercing-sucking pests, indicating that the effect of the sesquiterpenes found in the wild S. habrochaites can be insect specific. Our results provide for a better understanding of the morphology of S. habrochaites type-VI trichomes and paves the way to obtain insect-resistant tomatoes.

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Taxonomic notes on the genus Hedyotis sensu lato (Rubiaceae) in China

Phytotaxa ◽

10.11646/phytotaxa.414.3.1 ◽

2019 ◽

Vol 414 (3) ◽

pp. 121-128

Author(s):

RUI-JIANG WANG

Keyword(s):

New Combination ◽

Morphological Comparison ◽

Generic Delimitation ◽

New Synonyms ◽

Flora Of China

The genus Hedyotis sensu lato was splitted into several genera on basis of morphological and molecular evidences. Under this generic delimitation, seven new taxonomic treatments, including six new synonyms and one new combination, are proposed for the Flora of China. The name Hedyotis tenelliflora that misapplied to Scleromitrion angustifolium is also corrected with morphological comparison.

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