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Lupinus mutabilis
Pisac, Peru
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
Genus:	Lupinus
Subgenus:	Lupinus subg. Platycarpos
Species:	L. mutabilis
Binomial name
Lupinus mutabilis Sweet
Synonyms
Lupinus cruckshankii Hook

Lupinus mutabilis is a species of lupin grown in the Andes, mainly for its edible bean. Vernacular names include tarwi (in Quechua II, pronounced tarhui), chocho, altramuz, Andean lupin, South American lupin, Peruvian field lupin, and pearl lupin. Its nutrient-rich seeds are high in protein, as well as a good source for cooking oil. However, their bitter taste has made L. mutabilis relatively unknown outside the Andes, though modern technology makes removing the bitter alkaloids easier. Like other species of lupin beans, it is expanding in use as a plant-based protein source.

Origin and dissemination

The origin of L. mutabilis has been identified in the Andean region of Ecuador, Peru, and Bolivia. In this area, the greatest genetic variability of this species was found. The plant has been domesticated for over 1500 years because of its high protein content.

Biology

L. mutabilis is an annual plant. The stem is hollow and highly branched. Plant height reaches from 0.5 to 2.8 metres (1 ft 8 in to 9 ft 2 in), depending on the environmental conditions and the genomic properties. Due to the high vegetative growth, species from northern South America are taller than species from the southern Andean region. Its highly variable genome contains 2n = 48 chromosomes, which leads to significant differences in morphology. Several architectural types of L. mutabilis exist. The most common is the branching in V-form, which has the highest biomass production. The basal branching type has the positive feature that its infructescence is at the same level. This species is preferably promoted because of its early ripening, stability, and homogeneity in seed quality.

Morphology

The fruit is a 5 to 12 cm (2–5 in) long pod, depending on the amount of seed. One pod contains on average 2–3 seeds, but can have up to 9 seeds per pod. The thousand-seed weight (TSW) is around 200 g. Leaves are palmate and have a typical appearance: one leaf is divided into five to twelve leaflets with an oval or lanceolate form. The form is typical for Faboideaes. The corolla reaches 1 to 2 cm (3⁄8–3⁄4 in) and contains five petals. Variation in coloration is high and reaches from white to purple. The white coloration is recessive to purple. L. mutabilis has a strong taproot reaching 3 metres (3 yd) length. Like all Leguminosae, secondary roots build nodules containing bacteria for nitrogen fixation.

Development

The growing cycle varies from 150 to 360 days, depending on the genotype, altitude, and environmental conditions. Phenological phases are emergence, first true leaf, formation of the raceme on the central stem, flowering, podding, pod ripening, and physiological maturity.

Use

Human consumption

The bone-white seed contains more than 40% protein and 20% fat and has been used as a food by Andean people since ancient times, especially in soups, stews, salads and by itself mixed with boiled maize. Like other legumes, its protein is rich in the essential amino acid lysine. The distribution of essential fatty acids is about 28% linoleic acid (omega-6) and 2% linolenic acid (omega-3). It has a soft seed coat for easy cooking. It may not have been more widely used because of its bitter taste due to the alkaloid content. It contains unusually high amounts of sparteine, which make up nearly half of its alkaloid content. However, the alkaloids are water-soluble and can be removed by soaking the seeds in water for a few days. QAs are heat-stable toxins; cooking alone does not remove the alkaloids. Like other species of lupin beans, chocho beans are expanding in use as a plant-based protein source in the world marketplace.

Compounds

L. mutabilis contains 42% protein and 18% fat on average. The high fat content has allowed commercial oil pressing. The protein digestibility and nutritional value are similar to those in soybeans.

Contents in the seed:

As with all Lupinus spp., L. mutabilis produces compounds called Bandas de Lupinus albus doce (BLADs). Also, as with the rest of the genus, it produces oligomers called BLAD-containing oligomers (BCOs). BCOs have a fungicidal action with multiple MoAs. BCOs were previously classified by the Fungicide Resistance Action Committee (FRAC) into group M 12, but are as of 2021 in group BM 01 (short for "Biological, Multiple modes of action").

Wild populations of L. mutabilis contain toxic, bitter quinolizidine alkaloids. Cultivars also contain QAs but at much lower levels thanks to breeding programs begun in Germany in the 1930s.

Green manure and soil improver

L. mutabilis can fix nitrogen from the air. Therefore, succeeding cultures can profit from 60 to 140 kg (130 to 310 lb) of nitrogen per hectare. Incorporation in the flowering stage leads to a higher quantity of organic matter and an improved soil structure.

Agricultural aspects

Soil and climate requirements

L. mutabilis is a crop for cool climates and exists mainly in valleys at high altitudes, such as the Andes at tropical latitudes. The crop can be grown at an altitude that ranges from 800 to 3,000 metres (2,625 to 9,843 ft). The crop withstands exceptional levels of drought. Mature plants are resistant to frost, whereas seedlings are sensitive to low temperatures.

Cultivation technique

Sowing

In traditional farming practices, minimum tilling is done before sowing. 100 to 120 kg/ha (89–107 lb/acre) of unselected seeds is sown.

Improved cultivation practices:

It is recommended to apply 80 kg (180 lb) phosphorus and 60 kg (130 lb) of potassium as fertilization before sowing. The sowing of 90 kg (200 lb) selected seeds in a distance of 60 to 80 cm (24–31 in), either by hand or by seed drill, follows. Plants germinate fast due to the high-fat content in the seeds.

Crop rotation aspects

Early varieties of L. mutabilis, with a growing period of about 150 days, can be cultivated in rotation with potatoes and cereals. Nematode disease of potato can be controlled by alkaloids when cultivated after L. mutabilis.

Harvest

In traditional farming practices, harvest occurs when plants have reached full maturity and the water content of seeds is between 8-12%. From peasant plots average yield is about 500 to 1,000 kg (1,100–2,200 lb) per hectare under suitable conditions yield reaches up to 3,500 kg (7,700 lb) per hectare.

Disease control

Alkaloids can act as pesticides, but breeding goals aim to achieve a low alkaloid content. Therefore, other disease control methods must be applied. Since L. mutabilis is a low-input crop, disease control is mainly done by phytosanitary methods. Reducing soil-born saprophytes can be reached by removing a dry straw from the field. Instead of green manure, the plant residues can be used as fuel. Seed-borne diseases can be reduced by translocation of seed production and by using certificated seed. If the cultivator does seed production, diseases can be controlled by reducing the number of infected seeds and permanently controlling diseases in the field. Another possibility is to treat the seed with a fungicide before sowing.

Breeding goals

Since species with low alkaloid content are already available, a further step would be to make them more stable, and low alkaloid content is inherited. Other breeding goals are tolerance to diseases and insects, improvement in yield, early maturing, and synchronous ripening. Higher resistance could be reached by breeding a variety with high alkaloid content in leaves but not in the seeds.

References

1. "Lupinus mutabilis - names". Encyclopedia of Life. Retrieved 2020-08-23.
2. Teofilo Laime Ajacopa (2007). Diccionario Bilingüe: Iskay simipi yuyayk’anch: Quechua – Castellano / Castellano – Quechua (PDF). La Paz, Bolivia: futatraw.ourproject.org.
3. ^ Lost crops of the Incas: little-known plants of the Andes with promise for worldwide cultivation. Washington, D.C.: National Academy Press. 1989. pp. 180–9. doi:10.17226/1398. ISBN 978-0-309-07461-2.
4. ^ Poinski, Megan (2021-02-25). "Why chocho may be the next big plant-based protein". FoodDive. Retrieved 2021-02-27.
5. ^ Neglected crops: 1492 from a different perspective (1994). Ed.: J.E. Hernándo Bermejo and J. León; publ. in collab. with the Botanical Garden of Córdoba (Spain)
6. ^ Rainer Gross (1982). El cultivo y la utilización del tarwi: Lupinus mutabilis sweet. Rome: Organización de las Naciones Unidas para la Agricultura y la Alimentación. ISBN 978-92-5-301197-1.
7. "Invisible KILLERS :: Health Focus: Toxins from Plants".
8. "Strong Growth Predicted for Lupin Protein Market as Demand for Plant-Based Foods Increases". vegconomist. 2020-09-07. Retrieved 2021-02-27.
9. 2.1.2. Composición química y valor nutricional de Lupinus mutabilis
10. Gulisano, Agata; Alves, Sofia; Martins, João Neves; Trindade, Luisa M. (2019-10-30). "Genetics and Breeding of Lupinus mutabilis: An Emerging Protein Crop". Frontiers in Plant Science. 10. Frontiers: 1385. doi:10.3389/fpls.2019.01385. ISSN 1664-462X. PMC 6831545. PMID 31737013. S2CID 204938901.
11. FRAC (Fungicide Resistance Action Committee) (March 2021). "FRAC Code List ©*2021: Fungal control agents sorted by cross resistance pattern and mode of action (including coding for FRAC Groups on product labels)" (PDF). pp. 1–17. Archived from the original (PDF) on 2021-11-05. Retrieved 2021-07-04. p. 16
12. ^ Kaiser, N.; Douches, D.; Dhingra, A.; Glenn, K.; Herzig, Philip Reed; Stowe, Evan C.; Swarup, S. (2020). "The role of conventional plant breeding in ensuring safe levels of naturally occurring toxins in food crops". Trends in Food Science & Technology. 100: 51–66. doi:10.1016/j.tifs.2020.03.042. ISSN 0924-2244. S2CID 216391401.

External links

• The ancient Ecuadorean legume being hailed as a new superfood – BBC
• Plants for a Future
• Lupins - geography, classification, genetic resources
• 'From the Andes: First Potato, Then Quinoa, Now Tarwi?' in The Natural Farmer, Fall 2004 (p. 40)
• 'Tarwi' chapter, in "Lost Crops of the Incas"

• Lupinus
• Flora of the Andes
• Flora of Bolivia
• Flora of Ecuador
• Flora of Peru
• Crops originating from South America
• Crops originating from Ecuador
• Crops originating from Peru
• Peruvian cuisine