Durch ihre Umwelt- und Nährwertvorteile erweckten Afrikanische indigene Blattgemüse – „African Indigenous Vegetables“ (AIV) in letzter Zeit Aufmerksamkeit als „Supergemüse“ (Cernansky 2015). Da mehrere Spezies aus unterschiedlichen botanischen Familien innerhalb der AIVs vertreten sind, ist ein besseres Verständnis Spezies spezifischer Eigenschaften, wie z.B. Ernährungswert und agronomischem Management nötig, um diese Vorteile voll ausschöpfen zu können. In dieser Arbeit haben wir Afrikanisch indigene Blattgemüsearten aus fünf Familien, inklusive C3 and C4 Spezies und Leguminosen und nicht-Leguminosen (Brassica carinata/Cruciferae - Ethiopian Kale, Amaranthus cruentus/Amaranthaceae - Amaranth, Vigna unguiculata/Leguminosae - Cowpea, Solanum scabrum/Solanaceae - African Nightshade, Cleome gynandra/Capparaceae - Spiderplant) mit einer importierten und in Kenia häufig angebauten Gemüseart (Brassica oleracea acephala/Cruciferae - Exotic Kale) verglichen. Wir betrachteten die Pflanzenarten hinsichtlich ihrer Konzentrationen an wertgebenden und toxischen Elementen in Blättern als Index für den Nährwert, ihrer Reaktionen auf unterschiedliche zur Verfügung gestellten Mengen und Formen an Phosphor (P) als Index für die Adaptation an suboptimale chemische Bodenbedingungen und ihre erntebedingten Nährstoffausfuhren aus dem Boden als Index für den Düngerbedarf. Die Arbeit war in das interdisziplinäre Forschungsprogramm HORTINLEA (Horticultural Innovation and Learning for Improved Nutrition and Livelihood in East Africa) eingebunden. / African Indigenous Vegetables (AIVs) have recently captured considerable attention as “super vegetables” due to their nutritional and environmental benefits (Cernansky 2015). As AIVs include many species belonging to different botanical families, more species-specific knowledge e.g. on nutritional value and agronomic management is needed to fully exploit those benefits. In this thesis we compared leafy AIV species from five families including C3 and C4 species, and a legume and non-legume species (Brassica carinata/Cruciferae - Ethiopian kale, Amaranthus cruentus/Amaranthaceae - amaranth, Vigna unguiculata/Leguminosae cowpea, Solanum scabrum/Solanaceae - African nightshade, Cleome gynandra/Capparaceae - spider plant) with a non-indigenous species, which is commonly grown in Kenya (Brassica oleracea acephala/Cruciferae - “exotic kale”). We compared the leaf concentrations of beneficial nutrients and heavy metals as an index for the nutritional value, the performance under different rates and forms of phosphorus (P) supply as an index for adaptation to suboptimal chemical soil conditions, and the harvest-related nutrient outflow from soil as an index for fertilizer need. The thesis was embedded in the interdisciplinary research program HORTINLEA (Horticultural Innovation and Learning for Improved Nutrition and Livelihood in East Africa).

Thesis (PhD)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: South Africa is rich in biodiversity among which are semi-domesticated vegetable species which are known as wild or indigenous vegetables. These wild indigenous vegetables have been reported to be good in nutritional qualities such as macro and micronutrients. However, there is still a high prevalence of malnutrition; especially micronutrient deficiencies among low or marginal income bracket of the population. The use of indigenous vegetables has been proposed as part of the solutions to the problems of micronutrient malnutrition among these populations. Indigenous vegetables are an important source of food in the maize based subsistence farming sector of rural South Africa. Their main role is as relish as they are used as an accompaniment for staple cereal based diets. They are also generally reported to be rich in micronutrients. Although they may be consumed in small quantities, they influence the intake of cereal staples, manage hunger and play a central role in household food security for the poorer rural groups. Mixing several indigenous vegetables species in one meal contributes to dietary diversity in terms of more vegetable types as well as in terms of choice of relish. For some very poor families indigenous vegetables are substitutes for some food crops. The seasonal occurrence of these vegetables leaves many families without a food source during the off-season. Indigenous vegetables increase agro-biodiversity at the household level. This agro-biodiversity helps in buffering against the accumulation and multiplication of pests and diseases and provides important cover for the soil. Further research on agronomic, social and economic dimensions is required to understand the roles of IV in subsistence farming systems in South Africa. The survey study revealed that indigenous vegetables were important in the diets of most rural people in the study area. They were consumed as relish although they were not being cultivated. Their method of acquisition was gathering from homesteads and the wild. These vegetables were also believed to be medicinal. The local naming of wild vegetables varied among villages in the same district such that a vegetable in one village was assigned to a different species of vegetable in another village. They were reportedly abundant during summer and there was a decrease in availability off-season leaving vulnerable people who rely on them with a food shortage. The utilisation of wild vegetables among South Africans is reported to be declining due to over reliance on introduced temperate species. Efforts to domesticate and cultivate wild vegetables could be hampered by several factors including seed dormancy and premature flowering. In this present study dormancy was observed in C. olitorius. The response of wild genotypes of C. olitorius with different seed sizes to various dry heat and hot water treatments was evaluated. Steeping seeds in boiling water (95oC) for ten seconds and soaking seeds in a hot water bath at 80oC for ten minutes resulted in the highest response to germination in this species. The study also recorded significant interactions between heat treatment and seed sizes. We concluded that C. olitorius seeds of different sizes require diverse durations of exposure to heat treatment methods to break dormancy caused by an impermeable seed coat. Cleome gynandra is another species that is consumed as a vegetable in various parts of the world including Africa. The plant is also used as a medicinal herb for the treatment of various human diseases. Among the wild vegetables, C. gynandra has been reported to flower prematurely, a phenomenon known as bolting and common in many vegetable crops. Premature flowering (bolting) can be as a response to temperature extremes and photoperiod and affects many other leafy vegetables such as lettuce (Lactuca sativa), spinach (Spinacea oleracea) and mustard rape (Brassica juncea). Bolting leads to production losses in leaf vegetable crops as they flower before they have produced an economic yield. The removal of flowers and nitrogen application resulted in significant increases in the fresh and dry weight of cleome leaves. Removal of flowers resulted in a 46% increase in fresh weight of leaves. The observed positive response of leaf yield to removal of flowers offers a possible way to deal with the problem of bolting. The continuous removal of the flowers leads to increased utilisable leaf yield. The application of incremental amounts of nitrogen top dressing results in increased leaf yield in C. gynandra. The response of selected indigenous vegetables (Corchorus olitorius and Amaranthus cruentus) to micronutrients added to the soil was compared with the response of a reference crop; Swiss chard (Beta vulgaris var. cicla). For all the levels of micronutrients applied, Swiss chard accumulated Cu, Zn and Mn in the leaves at significantly (p<0.01) higher concentrations than the wild vegetables. Variations between the vegetables in the micronutrients were greater for Zn (72–363 ppm) and Mn (97.9–285.9 ppm) for Cu (8.8–14 ppm). C. olitorius had the least capacity to concentrate Mn and Zn in the leaf, which suggested that this vegetable is a less attractive candidate for agronomic bio-fortification of these elements. However, C. olitorius accumulated Fe at a significantly higher concentration (327 ppm) in the leaves than did Amaranthus (222 ppm) or Swiss chard (295 ppm). Sulphur as a macronutrient varied little in the plant species tested. The mean S concentration in the leaves ranged from 0.26% in C. olitorius to 0.34% in Amaranthus cruentus and Swiss chard. We concluded that the different vegetables have different abilities to take up Cu and Zn in the order Swiss chard > Amaranthus > Corchorus, and that they responded to micronutrients added to the soil but only up to certain limits of supplementation. The results from this current study seem to contradict the belief that wild vegetables have the inherent ability to concentrate mineral micronutrients in their tissue. Factors such as environment, anti-nutrients, dietary diversity, plant parts, plant age, and varieties result in differences in reported nutritional composition of indigenous vegetables. Post-harvest handling, storage, cooking and preservation also alter the composition. The need to optimise protocols for each vegetable type and for different laboratories makes analysis expensive. Equipment and methods of analysis are varied and may not be comparable, making it difficult to generalise on the composition of these vegetables. The Agricultural Research Council of South Africa and other stake holders are conducting studies on some aspects of these vegetables. There are still many information gaps regarding many aspects of these vegetables which require research attention. These include; the selection and improvement of genotypes, seed biology and germination studies, agronomic (population, fertiliser, crop mixtures) studies and phyto-chemical evaluation of these important species in order to encourage the overall use of these important indigenous resources. Finally, there is need to promote their increased utilisation. / AFRIKAANSE OPSOMMING: Suid- Afrika is ryk aan biodiversiteit waaronder half-mak groente spesies, wat as wilde of inheemse groente bekend is, voorkom. Hierdie wilde inheemse groente is aangedui om goed in voedingswaarde te wees met voldoende makro-en mikrovoedingstowwe. Daar is egter nogsteeds 'n hoë voorkoms van wanvoeding, veral tekorte aan mikronutriënte onder die lae of marginale inkomstegroep van die bevolking. Die gebruik van inheemse groente word voorgestel as deel van die oplossing van die probleem van wanvoeding onder hierdie bevolkings. Inheemse groente is 'n belangrike bron van voedsel in die mielie gebaseerde bestaansboerdery sektor van landelike Suid-Afrika. Hul vernaamste rol is as smoor waar dit gebruik word tesame met stapelvoedsel in ʼn graan-gebaseerde dieet. Hierdie groentes was oor die algemeen ook aangedui om ryk te wees in mikrovoedingstowwe. Hoewel hulle verteer kan word in klein hoeveelhede, beïnvloed hulle die inname van graan stapelvoedsel, en speel 'n sentrale rol in huishoudelike voedselsekuriteit vir die armer landelike groepe. Vermenging van verskeie inheemse groente spesies in een maaltyd dra by tot die dieet diversiteit in terme van meer groentesoorte sowel as in terme van die keuse van smaak. Vir 'n paar baie arm gesinne is inheemse groentes die plaasvervanger vir gewone groente gewasse. Die seisoenale voorkoms van hierdie groente laat baie gesinne sonder 'n bron van voedsel gedurende die af-seisoen. Inheemse groente verhoog landbou-biodiversiteit op ʼn huishoudelike vlak . Hierdie landbou-biodiversiteit help buffer teen die opbou en vermeerdering van peste en siektes en bied belangrike dekking vir die grond. Verdere navorsing op akkerbou-, maatskaplike en ekonomiese aspekte is nodig om die rolle van inheemse groentes in bestaansboerdery in Suid-Afrika te verstaan. Die studie opname het getoon dat inheemse groente belangrik was in die dieet van die meeste mense van die platteland in die studie area. Hierdie groentes was gebruik as smoor hoewel hulle nie gekweek word nie. Hul metode van verkryging is deur dit te versamel van huise en die natuur. Die groentes word ook as medisinaal beskou. Die plaaslike benaming van wilde groente het gewissel tussen dorpe in dieselfde distrik, tot so 'n mate dat die benaming van groente tussen dorpe verskil. Hulle was na bewering volop in die somer, en daar was 'n afname in die beskikbaarheid af-seisoen, wat kwesbare mense, wat staatmaak op hul voorkoms, met 'n tekort aan kos laat. Die benutting van wilde groente onder Suid-Afrikaners daal as gevolg van die afhanklikheid in nuwe spsies. Pogings om te mak en wilde groente te kweek, kan belemmer word deur verskeie faktore, insluitend saaddormansie en voortydige blom. In hierdie studie was dormansie waargeneem in C. olitorius. Die reaksie van wilde genotipes van C. olitorius met verskillende saad groottes op verskeie droë hitte en warm water behandelings, was geëvalueer. Sade was geweek in kookwater ( 95oC ) vir tien sekondes en ander in 'n warm water bad by 80oC vir tien minute, en het gelei tot die hoogste reaksie op ontkieming in hierdie spesie. Die studie het ook belangrike interaksies tussen hitte behandeling en saad groottes getoon. Ons het tot die gevolgtrekking gekom dat C. olitorius sade van verskillende groottes diverse duur van blootstelling vereis en ook so m.b.t. die ondeurdringbare saadhuid. Cleome gynandra is nog 'n spesie wat as 'n groente in verskeie dele van die wêreld, insluitend Afrika verbruik word. Die plant word ook gebruik as 'n medisinale plant vir die behandeling van verskeie siektes van die mens. Onder die wilde groente, was C. gynandra aangedui om vroeg te blom, 'n verskynsel wat bekend staan as “bolting” en is algemeen in baie groente gewasse. Voortydige blom (vas) kan wees as 'n reaksie op die temperatuur uiterstes en fotoperiode en raak ook baie ander groen groente soos blaarslaai (Lactuca sativa) , spinasie (Spinacea oleracea) en mosterd (Brassica juncea ) . “Bolting” lei ook tot produksie verliese in blaar groentegewasse as hulle blom voordat hulle 'n ekonomiese opbrengs opgelewer het. Die verwydering van blomme en stikstof toediening het gelei tot 'n aansienlike toename in die vars en droë gewig van Cleome blare. Verwydering van blomme het gelei tot 'n toename van 46% in vars gewig van die blare. Die waargenome positiewe reaksie van die blaar opbrengs deur verwydering van blomme bied 'n moontlike manier om die “bolting” probleem te hanteer. Die voortdurende verwydering van die blomme lei tot verhoogde bruikbare blaar opbrengs. Die toepassing van toenemende stikstof topbemesting het verhoogde blaar opbrengs in C. gynandra tot gevolg. Die reaksie van geselekteerde inheemse groente (Corchorus olitorius en Amaranthus spp ) met mikrovoedingstowwe toegevoeg tot die grond, is in vergelyk met die reaksie van 'n verwysings gewas; spinasiebeet (Beta vulgaris var cicla . ). Vir al die vlakke van mikronutriente toegepas, was die spinasiebeet opgehoopte Cu , Zn en Mn in die blare, in beduidend (p <0.01 ) hoër konsentrasies as die wilde groente.

MSCPNT / Department of Nutrition / Hypertension remains a major public health problem that needs different comprehensive health strategies to deal with it. Indigenous vegetables, Blackjack in particular, have been shown to possess anti-hypertensive properties that are attributed to bioactive chemical substances such as phytochemicals, fiber, antioxidants as well as micronutrients that include potassium, magnesium, calcium, vitamin C, zinc, iron and copper. The use of indigenous vegetables in combination with the conventional hypertension treatment may reduce hypertensive conditions; hence, the purpose of this study was to determine Blackjack nutritional knowledge and consumption by hypertensive patients. A cross-sectional study employing both quantitative and qualitative methods was conducted on 275 hypertensive participants at Mphambo and Mutale Health Centers, Vhembe District of Limpopo Province, South Africa. A questionnaire was used to collect data on participants’ Blackjack nutritional knowledge, Blackjack availability around their households as well as their Blackjack consumption patterns and nutritional status. The Blackjack nutritional knowledge data was triangulated with focus group discussions and participants’ nutritional status was assessed by anthropometric and dietary intake methods. The body mass index (BMI) was calculated and dietary intake frequency from selected foods was determined. Blood pressure was measured using Microlife automatic blood pressure monitor. The findings indicated that most hypertensive participants had poor knowledge of the nutritional importance of Blackjack and its associated medicinal contribution on hypertension management. Participants were unable to mention different diseases that can be prevented or managed by Blackjack, which was mostly consumed once a week with porridge during the summer season. Hypertensive patients were consuming high amounts of sodium and less amounts of minerals that are known to regulate blood pressure, such as potassium and magnesium. Hypertensive patients had high prevalence of overweight and obesity and most were either in hypertension stage 1 or stage 2. Lack of Blackjack nutritional knowledge may have contributed to a decreased consumption of Blackjack by hypertensive patients. The health professionals should promote the nutritional benefits of Blackjack in rural areas, particularly to hypertensive patients to raise awareness of Blackjack’s benefits in disease prevention and management. / NRF