''Jaborosa'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of flowering plants in the family

Solanaceae The Solanaceae , or nightshades, are a family of flowering plants that ranges from annual and perennial herbs to vines, lianas, epiphytes, shrubs, and trees, and includes a number of agricultural crops, medicinal plants, spices, weeds, and orn ...

, the nightshades. There are about 23 species, all native to

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southe ...

, where they are distributed from

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...

Patagonia Patagonia () refers to a geographical region that encompasses the southern end of South America, governed by Argentina and Chile. The region comprises the southern section of the Andes Mountains with lakes, fjords, temperate rainforests, and gl ...

. Most occur in the

Andes The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S ...

. Most can be found in

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...

and ten are

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the country.

Description

Most ''Jaborosa'' are

rhizomatous In botany and dendrology, a rhizome (; , ) is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow hori ...

perennial herbs except '' J. bergii'' and '' J. sativa'', which are annual or biennial.

Ecology

'' J. rotacea'' is

pollinated Pollination is the transfer of pollen from an anther of a plant to the stigma of a plant, later enabling fertilisation and the production of seeds, most often by an animal or by wind. Pollinating agents can be animals such as insects, birds, ...

flies Flies are insects of the order Diptera, the name being derived from the Greek δι- ''di-'' "two", and πτερόν ''pteron'' "wing". Insects of this order use only a single pair of wings to fly, the hindwings having evolved into advanced ...

, and '' J. runcinata'' is pollinated by

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...

s. Sphingid moths feed on the

nectar Nectar is a sugar-rich liquid produced by plants in glands called nectaries or nectarines, either within the flowers with which it attracts pollinating animals, or by extrafloral nectaries, which provide a nutrient source to animal mutualists ...

of '' J. integrifolia''.

Chemistry

Like plants in several other Solanaceae genera, many ''Jaborosa'' species contain

steroid A steroid is a biologically active organic compound with four rings arranged in a specific molecular configuration. Steroids have two principal biological functions: as important components of cell membranes that alter membrane fluidity; and a ...

-derived compounds called

withanolide Withanolides are a group of at least 300 naturally occurring steroids built on an ergostane skeleton. They occur as secondary metabolites primarily in genera of the Nightshade family, for example in the tomatillo. Structurally, withanolides co ...

s. Many of the withanolides isolated from ''Jaborosa'' have been dubbed jaborosalactones. Some withanolides are

phytotoxic Phytotoxins are substances that are poisonous or toxic to the growth of plants. Phytotoxic substances may result from human activity, as with herbicides, or they may be produced by plants, by microorganisms, or by naturally occurring chemical react ...

, having effects on other plants such as inhibiting

germination Germination is the process by which an organism grows from a seed or spore. The term is applied to the sprouting of a seedling from a seed of an angiosperm or gymnosperm, the growth of a sporeling from a spore, such as the spores of fungi, fer ...

and

radicle In botany, the radicle is the first part of a seedling (a growing plant embryo) to emerge from the seed during the process of germination. The radicle is the embryonic root of the plant, and grows downward in the soil (the shoot emerges from the ...

growth. Some have antifeedant effects, deterring insects such as

mealworm Mealworms are the larval form of the yellow mealworm beetle, ''Tenebrio molitor'', a species of darkling beetle. Like all holometabolic insects, they go through four life stages: egg, larva, pupa, and adult. Larvae typically measure about or ...

s (''Tenebrio molitor''), the

Mediterranean fruit fly ''Ceratitis capitata'', commonly known as the Mediterranean fruit fly or medfly, is a yellow-and-brown fly native to sub-Saharan Africa. It has no near relatives in the Western Hemisphere and is considered to be one of the most destructive fr ...

(''Ceratitis capitata''), and the African cotton leafworm (''Spodoptera littoralis'') from consuming the plant.

Diversity

Species include:''Jaborosa''.
Solanaceae Source. Retrieved 6 July 2013. *'' Jaborosa ameghinoi'' *'' Jaborosa araucana'' *'' Jaborosa bergii'' *'' Jaborosa cabrerae'' *'' Jaborosa caulescens'' *'' Jaborosa chubutensis'' *'' Jaborosa integrifolia'' *'' Jaborosa kurtzii'' *'' Jaborosa lanigera'' *'' Jaborosa leucotricha'' *'' Jaborosa magellanica'' *'' Jaborosa odonelliana'' *'' Jaborosa oxipetala'' *'' Jaborosa parviflora'' *'' Jaborosa pinnata'' *'' Jaborosa reflexa'' *'' Jaborosa riojana'' *'' Jaborosa rotacea'' *'' Jaborosa runcinata'' *'' Jaborosa sativa'' *'' Jaborosa squarrosa'' *'' Jaborosa volkmannii''

References

{{Taxonbar, from=Q144712 Solanoideae Solanaceae genera Flora of South America