Onobrychis viciifolia; a comprehensive literature review of its history, etymology, taxonomy, genetics, agronomy and botany

Abstract

Onobrychis viciifolia(sainfoin) is a forage legume crop with many positive agronomic, environmental, nutritional and nutraceutical attributes. Farmers also benefit from its drought tolerance in areas of low rainfall and light free draining soil, mainly due to its deep taproot. It is resistant to most common pest and diseases and is a valuable resource for pollinators, specifically cultivated for honey production in some regions. It has many benefits for animals, being highly palatable and without danger of bloat, which can be life-threatening to livestock. Its decline in Northern Europe started during the Green Revolution and was impacted by changes towards more intensive farming. Unlike other forage legume crops such as red clover and lucerne, sainfoin does not respond well to inputs and is difficult to establish and maintain. Sainfoin could be classified as an ‘orphan crop’ with very little genetic improvement or agronomic studies in the past 60 years. In the past 5–10 years, however, there has been a resurgence in interest and this has given rise to a number of studies and initiation of systematic improvement of the crop, which is indispensable to its reintroduction into the farmed environment. Interest has been driven in part by considerable evidence to suggest that condensed tannins present in the legume foliage, together with other polyphenol compounds, have positive effects on animal nutrition together with anthelmintic properties. These compounds are also thought to play a role in environmental benefits. There remain many challenges to address in order to optimize the potential for cultivation of sainfoin and its use as a beneficial forage crop. This review makes particular reference to a recently completed project; ‘Legume Plus’, funded by the European Union and embracing a multi-disciplinary approach to both understand and improve the crop for farmers. The present review covers results from both this project and other studies during the past 5 years, also drawing on historic studies of etymology, taxonomy, genetics, agronomy and botany, aiming to be a useful resource for research and for practical plant breeders and agronomists.

May the Inclusion of a Legume Crop Change Weed Composition in Cereal Fields? Example of Sainfoin in Aragon (Spain)

“…The results of lower crop cover in S3 compared to S2 suggest a decay of the crop as shown by other authors [4,46,47] (Table 6). The lack of significant differences in crop cover between cereals and sainfoin at flowering/earing shows that both types of crops probably compete similarly with weeds at this stage.…”

“…However, in these mixed crops sainfoin may also suffer from competition of grasses [23] so that these mixtures need to be selected carefully. Very little genetic improvement has been carried out in the last 60 years [4,5] despite the characterisation of many local accessions in different countries [24], thus there is a limited availability of well performing varieties [25]. It is generally accepted that sainfoin as well as other legumes should be more promoted in agriculture so that research generating new information around this crop is welcome.…”

Neophyte invasions in European grasslands

“…The most frequent neophyte in our data set was Onobrychis viciifolia , a perennial species native to southern and southeastern Europe and western Asia, from where it was intentionally introduced to the rest of Europe as a forage crop (Mora‐Ortiz & Smith, 2018). The second most frequent species was Erigeron canadensis , an annual or overwintering species native to North America.…”

Canadian sainfoin and fenugreek as forage and functional foods

“…Usually, the sainfoin cultivars grown in western Canada are taller than alfalfa grown in this region. The compound leaves of sainfoin are borne alternately on the stem and comprise 11 to 29 leaflets, which are narrow at the tip and wide at the base and are paired up the entire leaf, except for a single terminal leaflet at the tip and the flowers that grow on a long, spike-like terminal head (Mora-Ortiz & Smith., 2018). Conversely, in alfalfa, trifolate or multifoliate leaves form alternately on the stem and secondary and tertiary stems can develop from leaf axils (Teuber & Brick, 1988).…”