Morpho-Agronomic Variation among Phaseolus vulgaris Landraces: A Review

Phaseolus vulgaris L. of the family Fabaceae is widely grown for essential nutrients in its edible leaves, immature pods, and mature seeds. Landraces are local crops with wide morphological and genetic diversity. Morpho-agronomically, P. vulgaris landraces vary exceptionally in their vegetative and reproductive traits. These landraces vary in their germination rate and final percentage. Their growth form varies from bushy to vining type. Flowers range in their time to flowering, color, and size. Pods also vary widely in their time to pod formation; pod size, color, and shape; number of pods per plant; and time to pod maturity. Seeds also vary in their size, shape, color, and mass, as well as their number per pod and per plant. These landraces also vary in their resistance to pests and diseases from seed germination, plant growth and yield, and seed storage duration. A review on variation among P. vulgaris landraces forms basis for their future breeding as they are a good source of genetic diversity. This enables a possible selection for leaf, pod, and seed consumption, as well as resistance toward pests and diseases during the entire growth

Genetic diversity in Cucurbita pepo landraces from northern KwaZulu-Natal, South Africa, revealed by random amplified polymorphic DNA (RAPD) markers

Genetic variation in seven selfed and unselfed Cucurbita pepo landraces from districts in KwaZulu- Natal Province was investigated using the random amplified polymorphic DNA (RAPD). Out of 36 primers screened nine were selected, which gave 100 clear and bright fragments, out of which 94 (94%) fragments were considered polymorphic. The sizes of bands ranged from 75 to 1800 bp. The number of bands per primer ranged between nine and 14. The genetic differentiation coefficient between populations (GST) varied between 0.0022 and 0.0100, while the gene flow ranged between 49.4545 and 223.7226. The effective number of alleles, Nei’s gene diversity index and Shannon’s information index were the highest in the selfed population from Zululand (yellow) district (ZS) population (Ne= 1.2046; H=0.1677; I=0.3060) and the lowest in unselfed population from uThungulu (yellow) (TNS) population (Ne=1.1512; H=0.1301; I=0.2518). The production of specific RAPD markers by different primers indicated gene diversity between: Selfed and unselfed populations from the same geographic origin; populations with yellow/orange mature fruit from a population with green mature fruit; and also among different populations in general. The selfed population from uThungulu (yellow) (TS) and TNS populations, both from uThungulu district, were the highest in genetic identity (IN = 0.9996) and the closest in the genetic distance (D = 0.0004). The unselfed population from Umkhanyakude (green) (CPSP) and unselfed population from Umkhanyakude (yellow (MNS) populations as well as CPSP and TNS populations were the lowest in genetic identity (IN = 0.9985) and the furthest in genetic distance (D = 0.0015). The dendrogram mainly grouped the populations according to their mature fruit colour, and then according to their geographical origin. All genetic parameters indicated that there was plentiful genetic diversity in C. pepo landraces of northern KwaZulu-Natal, South Africa.Key words: Cucurbita pepo landraces, genetic variation, self-pollination, random amplified polymorphic DNA (RAPD) markers, northern KwaZulu-Natal

The use of African traditional medicines amongst Zulu women during childbearing in northern KwaZulu-Natal

In Africa, some women are still heavily depending on traditional medicine during childbearing to maintain healthy pregnancy, postpartum recovery and for infant care. This study was designed to assess the prevalence of traditional medicine use and associated factors of its use during childbearing. Data were collected using structured questionnaires and individual interviews were conducted with 140 women. The results indicated that majority of women (79%) were still using traditional medicine during childbearing for different purposes even with the availability of free health care services. The most commonly used traditional medicine used during pregnancy was isihlambezo. Umhlabelo herbal mixture was the most cited remedy used for post-partum recovery. For infant care, imbiza was the only used traditional remedy. The results of this study highlight the need for health care workers to be aware of this practice and be able to provide mediation during ante-natal care classe

Morphological Variation of <i>Strychnos spinosa</i> Lam. Morphotypes: A Case Study at Bonamanzi Game Reserve, KwaZulu-Natal, South Africa

Strychnos spinosa Lam. of the Loganiaceae family is associated with versatility, poverty eradication, and rural economic development. However, the morphological diversity of S. spinosa is not well documented. This limits efforts toward its improvement and commercial exploitation. This study aimed to characterize the variability, vegetative and reproductive traits, and heritability of S. spinosa morphotypes at Bonamanzi Game Reserve. The majority of the morphotypes had green, rough, round immature fruits with dark green, elongated, open fully developed leaves. Fruits varied between roundish and pyriform shape as well as green and purple colour. Positive correlation was mainly seen between fruit and seed traits. Principal component analysis indicated fruit and seed traits as major discriminating factors for morphotypes, followed by leaf size and seed thickness. A dendrogram primarily grouped morphotypes according to fruit texture. Genotypic variance and genotypic coefficient of variation were higher than environmental variance and environmental coefficient variation in reproductive traits of S. spinosa. A rough pericarp texture and purple tinge on the immature leaves of some morphotypes was recorded for the first time. Differences in morphological features across S. spinosa morphotypes indicate a high level of diversity that could be utilized by breeders to generate new cultivars. This first report on variability and heritability among S. spinosa morphotypes forms the basis of available germplasm essential for future breeding programs

Participatory Selection of Amaranthus Genotypes in the KwaMbonambi Area, KwaZulu-Natal, South Africa

Participatory variety selection (PVS) is a process that tests promising genotypes in farmers’ fields through a close farmer–researcher collaboration approach, which enhances the acceptance of new varieties by farmers. However, limited studies have been conducted to select Amaranthus genotypes that have potential for future breeding programmes in South Africa. Therefore, this study was aimed at selecting Amaranthus genotype(s) that is/are preferred by farmers in northern KwaZulu-Natal, using the PVS approach. Seedlings of fifteen Amaranthus genotypes were each planted in separate 10 × 10 m plots. Fourteen local farmers managed these genotypes and also determined the preferred traits to be used to evaluate them. These traits were: mild taste; profuse stem branching; big and numerous leaves; soft texture; and longer shelf life. Plants at four months after transplant were then evaluated and ranked according to farmers’ preferred traits using score sheets designed on a four-point Likert scale or five-point hedonic scale. However, genotype ACAT seed fair had the best scoring for appealing taste and aroma, and profuse branching. The TOT 8789 genotype had the largest and softest leaves. Again, A. thunbergii had the most numerous leaves of them all. These genotypes are thus recommended for multi-environment testing, seed multiplication, genetic improvement, and promotion for cultivation in South Africa