The BCSS Research Committee invites applications for grants for research projects that will provide new information on the biology, propagation or cultivation of succulent plants. Research proposals with immediate and direct application to the interests of the BCSS membership are a priority. Grants will normally be limited to a maximum of £2,000, though larger grants will be considered for exceptional projects. For details of how to apply and the conditions associated with the grants please follow this link.

Over the last decade, the Society has supported many research projects, helping to gather fundamental knowledge about the succulent plants we love, and also to nurture specialists in the field to benefit both science and the hobby. Each project is summarised in either CactusWorld or Bradleya so that members can learn about the discoveries.

The committee judges projects on their scientific value and relevance to the interests of the Society's members. If you would like to contribute to the effort to understand species, how they grow and where they are threatened, you can do so by donating through PayPal. It doesn't matter how small your donation is - everything helps!

 

Delimiting the genus Opuntia (Cactaceae)

César Ramiro Martínez-González & José de Jesús Morales-Sandoval

Universidad Nacional Autónoma de México, México (This email address is being protected from spambots. You need JavaScript enabled to view it.)

The genus Opuntia belongs to the Cactaceae that is characterized by having flattened stems known as cladodes, each one being similar in shape to a tennis racket. Plants of this genus are commonly known as nopales (in Spanish) or prickly pear (in English), which are used for human consumption as well as their fruits, which can be sweet (tunas) or acid (xoconostles). Similarly they are widely used as livestock feed, various industrial applications (adhesives, resin and waterproofing) and medically as precursors of some drugs. Prickly pears like all cacti are distributed naturally throughout the American continent and naturalized in many countries of the world. It is thought that prickly pears have their centre of origin and diversification in Mexico, where there is no consensus on how many species there are, since this depends on the specialized literature that is consulted.

Using a grant funded by the British Cactus and Succulent Society, Opuntia lasiacantha (Figure 1) and Opuntia rzedowskii (Figure 2) were studied, two species that are different, but for a long time some authors believed that they were the same species. We write "they believe" because detailed work had never been done on the two species to determine whether they were the same or two different species.

We analyzed morphological characters such as cladode size, spines, flower colour and fruit size, as well as their DNA to examine their relationship. The results obtained confirmed that they are two different prickly pear-producing species (Figures 1B–C and 2B–C). This research will be published in greater detail in the scientific journal Bradleya.

We thank all the members of the society since through the British Cactus and Succulent Society we received the finances to be able to carry out the fieldwork, characterize the entire life cycle of the two species (habit, mature cladode, juvenile cladode, flower and fruit) and obtained their genetic material. In order to be able to conserve these species it was first necessary to obtain the knowledge about which species exist.

We invite all readers interested in the subject to learn a little more about this fascinating and difficult plant group. For this we recommend the following publications, where you will find detailed information about the characteristics, habits, classification, distribution and uses of these prickly pears:

  • Barbera, G., Inglese, P. & Pimienta Barrios, E., (eds.) (1995). Agro−ecology, cultivation and uses of cactus pear. FAO Plant Production and Protection Paper No. 132. FAO, Rome.
  • Bravo Hollis, H. (1978) Las cactáceas de México. Vol. 1. National Autonomous University of Mexico, Mexico City.
  • Bravo Hollis, H. & Scheinvar, L. (1995). El interesante mundo de las cactáceas. National Council of Science and Technology, Mexico.
  • Hunt, D. (ed.) (2014). Further Studies in Opuntioideae (Cactaceae). Succulent Plant Research. Vol. 8.
  • Inglese, P., Saenz, C., Mondragon, C., Nefzaoui, A. & Louhaichi, M. (eds.) (2017). Crop ecology, cultivation and uses of cactus pear. ICARCA-FAO, Rome, Italy.
  • Majure, L., Puente, R., Griffith, M.P., Judd, W.S., Soltis, P.S. & Soltis, D.E. (2012). Phylogeny of Opuntia s.s. (Cactaceae): clade delineation, geographic origins, and reticulate evolution. American Journal of Botany 99(5):847-864.

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Figure 1. Opuntia lasiacantha. (A) Arborescent habit, 2.30 m high with fruit. (B) Red elliptical fruit. (C) Longitudinal section of the fruit, orange-red funicles.

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Figure 2. Opuntia rzedowskii. (A). Shrub habit, 1.20 m high with fruit. (B) Reddish-pink globular fruit. (C) Longitudinal section of the fruit, yellow funicles with pink tones.

 

Pollination biology of Stenocereus queretaroensis and the importance of bat pollination services

Connie Tremlett, University of Southampton, UK

Techaluta de Montenegro is a small town nestled in an incredible landscape in Jalisco, Mexico, framed on one side by forest-clad mountains and on the other by a seasonal lagoon which generates impressive dust-bathed red sunsets during the dry season. Columnar cacti play a keystone role throughout this landscape, providing food and structural resources to animals such as bats, birds and rodents. One such is a species of arborescent columnar cactus endemic to this region of central western Mexico, Stenocereus queretaroensis, which has been hugely important for the subsistence of local people for centuries, and is now cultivated commercially for its fruit (the pitaya), providing one of the main income streams for the town.

Figure 1 Medium

Figure 1. A pitaya plantation framed by mountains. © César Guzmán

With the help of a research grant from the BCSS, I visited the town to find out more about the pollination biology of this cactus to help inform local management. In 2016 we set up exclusion experiments on cacti in pitaya plantations and on ranches, by placing bags of different mesh sizes over flowers during the day and/or night to expose the flowers to certain pollinators only. So, for example, the bags could prevent birds and insects from accessing flowers during the day, but allow bats to reach them at night – or vice versa. We monitored the flowers to record whether they successfully developed into fruits, and collected the fruits to weigh them and count the number of seeds they contained.

Though many people think of bees and other insects when picturing pollinators, bats are important pollinators in tropical regions, and many species of columnar cacti in Mexico have a close relationship with nectar-feeding bats. In our study, we found that pollination by bats not only increased fruit yield for pitaya farmers, but also increased the size of fruits (thereby increasing the value of fruits as bigger fruits are sold at higher prices) and seed set. The principal pollinator is Leptonycteris yerbabuenae, the lesser long-nosed bat, a migratory species which travels along ‘nectar corridors’ between Mexico and the USA, pollinating many species of cacti and agaves en route.

Figure 2 Medium

Figure 2. A Leptonycteris bat visiting a Stenocereus queretaroensis flower to feed on nectar and pollen. © César Guzmán

Figure 3 Medium

Figure 3. A Leptonycteris yerbabuenae bat covered in pollen, demonstrating one reason why they are such effective pollinators – they get completely covered in it and then deliver large quantities to the next flower. © César Guzmán

This has important implications in a region where bats are commonly persecuted, due in part to the mistaken belief that all bats are ‘vampiros’, vampire bats, which can transmit rabies to cattle. Our research has shown local farmers and landowners that in order to maintain both fruit production on farms, and wild populations of Stenocereus queretaroensis (whose population in the area is already suffering the negative impacts of agricultural activities), then bat populations must be conserved, and the use of pesticides - which are toxic to bats - avoided.

Figure 4 MediumFigure 4. The final product! Baskets of pitayas for sale at market. © César Guzmán

You can read more about this research in our open access paper published in the Journal of Applied Ecology, “Pollination by bats enhances both quality and yield of a major cash crop in Mexico” found at https://doi.org/10.1111/1365-2664.13545.

Our grant from the BCSS also helped my research team (a collaboration between the University of Southampton, UK, and CIIDIR Durango, Instituto Politécnico Nacional, Mexico) carry out research to explore how the economic benefits of bat pollination to pitaya production are distributed between different social groups; and also to investigate which other species of cactus are pollinated by nectar-feeding bats and the implications for pollination networks. Stay tuned for the results!

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