Phaseolus acutifolius

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Phaseolus acutifolius
Phaseolusacutifolius.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Genus: Phaseolus
Species:
P. acutifolius
Binomial name
Phaseolus acutifolius
Synonyms [2] [3]
  • Phaseolus acutifolius var. tenuifoliusA.Gray
  • Phaseolus tenuifolius(A. Gray) Wooton & Standl.

Phaseolus acutifolius, also known as the tepary bean, is a legume native to the southwestern United States and Mexico and has been grown there by the native peoples since pre-Columbian times. It is more drought-resistant than the common bean (Phaseolus vulgaris) and is grown in desert and semi-desert conditions from Arizona through Mexico to Costa Rica. The water requirements are low. The crop will grow in areas where annual rainfall is less than 400 mm (16 in).

Contents

Description

The tepary bean is an annual and can be climbing, trailing, or erect, with stems up to 4 m (13 ft) long. The specific epithet, acutifolius, is derived from Latin acutus (pointed, acute), and -folius (-leaved). [4] A narrow leafed, variety tenuifolius, and a broader leafed, variety latifolius, are known. Domestic varieties are derived from latifolius. Observation of "a limited number" of wild specimens suggested that "the flowers concur with the summer rains, first appearing in late August, with the pods ripening early in the fall dry season, most of them in October". [5] :6 The beans can be of nearly any color. There are many local landraces. Beans vary in size but tend to be small. They mature 60 to 120 days after planting. [6]

Other names for this native bean include Pawi, Pavi, Tepari, Escomite, Yori mui, Yorimuni and Yori muni. The name tepary may derive from the Tohono O'odham phrase tʼpawi or "It's a bean". [7] The name for a small bean was recorded in the 17th century, in the now extinct Eudeve language of northern Mexico, as tépar (accusative case, tépari). [8] Names that contain yori in them typically refer to non-native species of beans, since those names mean "non-Indian person's bean". [9]

Cultivation

Tepary beans have been grown by Native Americans for thousands of years; cultivated beans have been found dating to 500 BCE in the Tehuacán Valley in Mexico. Tepary beans appear to have been domesticated in a single event in northern Mexico, based on genetic evidence. [10]

Tepary beans are very drought tolerant. Germination requires wet soil, but plants will flourish in dry conditions once established. [10] Too much water inhibits bean production. They were cultivated by various methods, most commonly after an infrequent rain in the desert or after flood waters along a river or ephemeral stream had subsided. The tepary bean is relatively disease free, except under conditions of high humidity.

The tepary bean was a major food staple of natives in the Southwestern United States and northern Mexico. In addition to being grown in floodplains, it was often grown alongside squash and corn. Growing these plants together, known as Three Sisters agriculture, enhances their growth and provides more balanced nutrition.

In the United States, the tepary bean was introduced to Anglo farmers in the 19th century by Tohono O'Odham (Papago) farmers. [5] :8–15[ failed verification ] The Native American method of planting in the American Southwest was to plant three to five seeds in hills six to eight feet apart. Beans were planted in arroyos that had been recently flooded by summer rain. [11]

Cultivation of tepary beans is possible under the most extreme conditions. The Sand Papago (Hia C-eḍ O'odham) were mainly hunter-gatherers but cultivated tepary beans and other crops when moisture made it possible for them to do so. In 1912, ethnographer Carl Lumholtz found small cultivated fields primarily of tepary beans in the Pinacate Peaks area of Sonora. In the Pinacate, with an average annual precipitation of 75 mm (3.0 in) and temperatures up to 48 °C (118 °F), Papago and Mexican farmers utilized runoff from sparse rains to grow crops. In the 1980s, author Gary Paul Nabhan visited this area, and found one farm family taking advantage of the first large rain in six years, planting seeds in the wet ground and harvesting a crop two months later. The most successful crops were tepary beans and a drought-adapted squash. Nabhan calculated that the cultivation in the Pinacate was the most arid area in the world where rain-fed agriculture is practiced. [12]

Northwestern Mexico is the primary area of production for tepary beans. The tepary is also cultivated in many countries in Africa, Australia, and Asia. In India, tepary beans are an ingredient in the snacks "bhujia" and Punjabi Tadka by Haldiram's. [7]

As of 2015, the International Center for Tropical Agriculture in Colombia is testing crossbreeds of the tepary bean and common bean, in order to impart the tepary's drought and heat resistance. The latter could be especially helpful given climate change's effects on agriculture. [13]

Heat stress resistance

P. acutifolius is a sister species of P. vulgaris; genomic studies estimate that it diverged from P. vulgaris around ~2.1 Mya. As part of this divergence, the species duplicated genes that supported resistance to abiotic stress in arid zones: binding genes coding for chitin-binding proteins, kinase activity, cell wall macromolecule catabolic/metabolic processes and amino sugar metabolism (Example: Glucosamine). The tepary bean uses these amino sugars as a protection mechanism against heat stress, preventing proteins within the body of the plant from starting a denaturation process. [14]

A study, published in 2021, showed that when the tepary bean plant is exposed to high temperatures there is a negative regulation of the genes involved in cell division (GO:0048523; GO:0045786) and a positive regulation of those involved in arrest (GO: 0007050). This suggests that above 37°C cells that are in the cell division cycle is arrested in the G1-S phase; it seems that this is done by the cell in order to avoid the development of organism and thus conserve energy. Trehalose synthesis genes were also found to be overexpressed; trehalose is a sugar that in high concentrations is capable of protecting cell membranes and proteins from the denaturation process. A synteny analysis revealed that there is an intrachromosomal rearrangement on chromosomes 2 and 9; this could be a factor in the difficulties in developing fertile hybrids [14]

Medical uses

Research in the United States and Mexico suggests that lectin toxins and other compounds from tepary beans may be useful in chemotherapy for treating cancer. However, further research is needed. [7]

Related Research Articles

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References

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  7. 1 2 3 "Tepary Bean". agriculturalproductsindia.com. Agro Products. Archived from the original on 2012-07-06. Retrieved 2012-07-08.
  8. Pennington, Campbell W. (1981). Arte y vocabulario de la lengua dohema, heve o eudeva (in Spanish). Mexico City: UNAM. p. 230.
  9. Felger, Richard Stephen; Beck Moser, Mary (1985). People of the Desert and Sea: Ethnobotany of the Seri Indians. Tucson: University of Arizona Press. p. 342.
  10. 1 2 Gray, A. (September 2018). "Plant Guide for Tepary Bean, Phaseolu acutifolius" (PDF). plants.USDA.gov. Natural Resources Conservation Service.
  11. "Tepary: the Bean that Laughs at Drought". Mother Earth News. July–August 1983. Retrieved 2012-07-08.
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  13. Charles, Dan (25 March 2015). "Meet The Cool Beans Designed To Beat Climate Change". NPR.org. Retrieved 25 March 2015.
  14. 1 2 Moghaddam, Samira Mafi; Oladzad, Atena; Koh, Chushin; et al. (2021-05-11). "The tepary bean genome provides insight into evolution and domestication under heat stress". Nature Communications. 12 (1): 2638. doi:10.1038/s41467-021-22858-x. ISSN   2041-1723. PMC   8113540 . PMID   33976152. S2CID   234472801.