Airampoa ayrampo

Name, range and habitat

The accepted name is Airampoa ayrampo (Haenke) Doweld. POWO also includes A. soehrensii, Tunilla soehrensii and Opuntia soehrensii among its synonyms. The natural range includes Peru, Bolivia, northern Chile and northwestern Argentina. The commercial term “ayrampo” does not replace botanical identification of a sample. [2-WWW] [Caldas-Cueva et al. 2016]

In the account of northern Chilean cactus fruits, the species was associated with elevations of 3700–4200 m above sea level. It grows as a low, widely spreading cactus. Plants were presented as clumps 30–60 cm in diameter and 10–20 cm tall. High-mountain origin means strongly variable daily conditions, but site elevation alone does not define the frost-resistance limit of a specific specimen in a wet winter. [Prat et al. 2025]

Segments, fruits and pollen

Segments in the northern Chilean description are 4–8 cm long with numerous areoles. The authors give 40–60 areoles per segment and 2–12 needle-like spines, reaching 7 cm in the material described. The fruit is about 2–3 cm in diameter, with pink-purple skin and dark purple flesh. These figures describe the authors' material and treatment, encompassing distinctly variable plants. [Prat et al. 2025]

Pollen of Tunilla soehrensii was analysed both in the northern Chilean study and in a comparison of Argentine Opuntioideae. Grains have numerous openings distributed over the surface and no clear polar axis. Scanning microscopy described a perforated exine with small spines. In palynological atlases, this set of traits helps recognise the group but does not replace assessment of the whole plant when distinguishing closely related taxa. [Miesen et al. 2015] [Garralla and Cuadrado 2007]

Germination after scarification

Jara-Peña and colleagues studied seeds from ripe fruits collected in Arequipa. After poor preliminary results, seed coats were abraded with fine no. 180 sandpaper. In the main experiment, 25 seeds were sown in each of five dishes per treatment. The substrate was 1% agar, temperature varied within 18–25°C, and observations lasted 30 days. Germination was defined as the appearance of a radicle 2 mm long. [Jara-Peña et al. 2024, pp. 4–5]

The illuminated treatment received 12 hours of light and 12 hours of darkness daily. The second treatment was kept in darkness. Seeds germinated only in the illuminated treatment, reaching a mean of 32%. The result in table 2 takes precedence over the discussion sentence in which the figures for two species were reversed. [Jara-Peña et al. 2024, table 2, p. 8]

A practical inference is to retain light access when attempting to sow similarly prepared seeds. The figure 32% describes the batch and procedure studied, rather than an expected result for every sowing. The agar experiment does not establish soil-to-aggregate proportions, pricking-out timing or a complete greenhouse seedling-management method. [Jara-Peña et al. 2024]

Fruit variation in the INIA gene bank

The study published in 2026 compared 13 fruiting accessions, separately maintained collection materials, out of 36 available in the INIA bank. Plants grew in Santa Rita, Arequipa, at 1292 m above sea level under drip irrigation. Fruits were taken from three plants per accession, four fruits per plant. The sample thus comprised 12 fruits per accession. Collection took place from February to May 2025. [Dadther-Huaman et al. 2026, p. 265–267]

Betalains were measured in extract from flesh and seeds dried at 40°C. Concentration results were expressed per 100 g dry mass of this material. Fruit mass in the adjacent column refers to the whole fresh fruit. Accession PER018775 had the greatest fruit mass, but its pigment concentration was much lower than in PER018767 and PER018751. Fruit size alone is therefore insufficient for selecting pigment-rich material. [Dadther-Huaman et al. 2026, tab. 2, p. 269]

The table presents means without extending them to yield per plant. Material was selected from accessions that fruited, and the experiment concerned one site and season. Differences do not demonstrate that accession ranking will remain the same in another climate, substrate or maturity stage. The authors also analysed betacyanins and betaxanthins separately. [Dadther-Huaman et al. 2026]

Application studies

Research on material of this species is presented in Ayrampo pigments in food and optoelectronic devices, in the “Biotechnology and applications” section. [Caldas-Cueva et al. 2016] [Rivera Tito et al. 2020] [Flint et al. 2024]