Barbarea vulgaris, also called as Bittercress, Herb Barbara, Rocketcress, Yellow Rocketcress, Winter Rocket, and Wound Rocket, is a biennial herb of the genus Barbarea, belonging to the family Brassicaceae.
The genus name Barbarea derives from Saint Barbara, the patron saint of artillerymen and miners, as this plant in the past was used to soothe the wounds caused by explosions. The species Latin name vulgaris means “common”.
This plant grows to about 30–60 centimetres (12–24 in) of height, with a maximum of 1 metre (3 ft 3 in). The stem is ribbed and hairless, branched at the base. It has a basal rosettes of shiny, dark green leaves. The basal leaves are stalked and lyre-pinnatifid, that is with a large terminal lobe and smaller lower lobes. The cauline leaves are smaller, ovate, toothed or lobed. The flowers are borne in spring in dense terminal clusters above the foliage. They are 7–9 millimetres (0.28–0.35 in) long, with four bright yellow petals.The flowering period extends from about April through July. The fruit is a pod of about 15–30 millimetres (0.59–1.2 in).
Natural insect resistance and its potential use in agriculture
Most Barbarea vulgaris genotypes are naturally resistant to some insect species that are otherwise specialized on the crucifer family. In the case of diamondback moth (Plutella xylostella) and the flea beetle Phyllotreta nemorum, the resistance is caused by saponins. Glucosinolates such as glucobarbarin and glucobrassicin are used as a cue for egg-laying by female cabbage white butterflies such as Pieris rapae. Indeed, the larvae of this butterfly thrive well on this plant. Diamond back moth females are also stimulated by these chemicals, but the larvae die due to the content of saponins which are apparently not sensed by the moths. This phenomenon has been tested for biological insect control: B. vulgaris plants are placed in a field and attract much of the diamondback moth egg load. As the larvae die shortly after hatching, this kind of insect control has been named "dead-end trap cropping".
The plant prefers fresh or moist places, on roadsides, along rivers, or on the slopes and in ditches, at an altitude of 0–1,600 metres (0–5,200 ft) above sea level.
Natural chemotypes with distinct ecology
A pubescent type (the "P-type") has been described from S. Scandinavia. This type has atypical chemistry and is devoid of resistance to the diamondback moth and the flea beetle Phyllotreta nemorum. The P-type belongs morphologically to the variety B. vulgaris var. arcuata, but may also be identical to the subspecies originally described as Barbaraea Beck arcuata Rchb. ssp. pubescens N. Busch. In this context, the usual type of B. vulgaris var. arcuata is called the "G-type" (for Glabrous (hairless) leaves).
A chemotype with deviating glucosinolate content has been described from W. Europe and named the "NAS-type" (because it is dominated by the glucosinolate glucoNASturtiin. This type has increased resistance to some specialized insects. In this context, the usual chemotype of B. vulgaris is called the "BAR" type (because it is dominated by glucoBARbarin).
- Barbarea vulgaris var. arcuata (Opiz ex J. Presl & C. Presl) Fr.
- Barbarea vulgaris var. brachycarpa Rouy & Foucaud
- Barbarea vulgaris var. longisiliquosa Carion
- Barbarea vulgaris var. sylvestris Fr.
- Dalby-Brown, Lea; Olsen, Carl Erik; Nielsen, Jens Kvist; Agerbirk, Niels (2011). "Polymorphism for Novel Tetraglycosylated Flavonols in an Eco-model Crucifer, Barbarea vulgaris". Journal of Agricultural and Food Chemistry 59 (13): 6947–56. doi:10.1021/jf200412c. PMID 21615154.
- Agerbirk, Niels; Olsen, Carl Erik (2011). "Isoferuloyl derivatives of five seed glucosinolates in the crucifer genus Barbarea". Phytochemistry 72 (7): 610–23. doi:10.1016/j.phytochem.2011.01.034. PMID 21354584.
- Agerbirk, Niels; Ørgaard, Marian; Nielsen, Jens Kvist (2003). "Glucosinolates, flea beetle resistance, and leaf pubescence as taxonomic characters in the genus Barbarea (Brassicaceae)". Phytochemistry 63 (1): 69–80. doi:10.1016/S0031-9422(02)00750-1. PMID 12657300.
- Kuzina, V.; Ekstrom, C. T.; Andersen, S. B.; Nielsen, J. K.; Olsen, C. E.; Bak, S. (2009). "Identification of Defense Compounds in Barbarea vulgaris against the Herbivore Phyllotreta nemorum by an Ecometabolomic Approach". Plant Physiology 151 (4): 1977–90. doi:10.1104/pp.109.136952. PMC 2785962. PMID 19819983. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2785962.
- Kuzina, Vera; Nielsen, Jens Kvist; Augustin, Jörg Manfred; Torp, Anna Maria; Bak, Søren; Andersen, Sven Bode (2011). "Barbarea vulgaris linkage map and quantitative trait loci for saponins, glucosinolates, hairiness and resistance to the herbivore Phyllotreta nemorum". Phytochemistry 72 (2–3): 188–98. doi:10.1016/j.phytochem.2010.11.007. PMID 21130479.
- Nielsen, Nikoline J.; Nielsen, John; Staerk, Dan (2010). "New Resistance-Correlated Saponins from the Insect-Resistant CruciferBarbarea vulgaris". Journal of Agricultural and Food Chemistry 58 (9): 5509–14. doi:10.1021/jf903988f. PMID 20387830.
- Shinoda, Tetsuro; Nagao, Tsuneatsu; Nakayama, Masayoshi; Serizawa, Hiroaki; Koshioka, Masaji; Okabe, Hikaru; Kawai, Akira (2002). "Identification of a triterpenoid saponin from a crucifer, Barbarea vulgaris, as a feeding deterrent to the diamondback moth, Plutella xylostella". Journal of Chemical Ecology 28 (3): 587–99. doi:10.1023/A:1014500330510. PMID 11944835.
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