Variation in macro-elements and protein contents of roselle (<i>Hibiscus sabdariffa</i> L.) from Niger

Abstract

Roselle is an important part of the human diet in many countries, particularly in the Sahel zone of West Africa. The leaves of Roselle are consumed as a green vegetable and in sauce. Nevertheless, little attention has been paid to their nutrient composition at different stages of plant growth. Therefore, the experiment was carried out under rainfall conditions from July to September 2006 at the experimental station of the Agrhymet Regional Centre in Niamey (Niger). The contents of Ca, K, Mg, P and protein in leaves of three ecotypes (A3, A7 and A9) were determined at stages I, II and III, corresponding, respectively to vegetative, flowering and mature stages. The experimental design was a randomized complete block with four replicates and one variable (ecotype). For ecotype A7, the protein content of the leaves decreased significantly (p<0.05) between stage I and II, than remained relatively constant up to stage III. In contrast for A3 and A9, protein content in leaves decreased significantly (p<0.05) between stage II and III. From stage I to III, the decrease of protein content in leaves was 41% for ecotype A3, 50% for A7 and 66% for A9. For all ecotypes, the P content of the leaves decreased progressively during plant growth. For A7 and A9, the reduction in P content from stage I to II and from II to III was about the same, namely 30%. However, for ecotype A3, the decrease was greater, respectively, 37% and 46%. The Mg content of the leaves was relatively constant for all three ecotypes at a given stage of plant development. However, the Mg content of the leaves decreased significantly (p<0.05) from flowering to maturity: 28% for A3, 23% for A9 and 14% for A7. For the three ecotypes, the Ca content of the leaves remained relatively constant from stage I to II, than increased markedly from stage II to III, to about 150% for A7, 85% for A3 and 50% for A9. From stage I to II, the leaves' K content decreased significantly for all three ecotypes, about 67% for A9, 62% for A3 and 44% for A7. The data indicated that Roselle can contribute useful amounts of essential nutrients such as Ca K, Mg, N and P mainly at vegetative stage in the diets of people who inhabit the western Sahel.

Agronomic Behavior of Mexican Roselle Cultivars Produced under Protected Agricultural Conditions

“…Several antecedents have exhibited variability in the height of roselle plants, with values of 30 to 192 cm under open-field cultivation conditions [ 29 , 30 , 31 , 32 ], and between 83 and 114 cm in a greenhouse cultivation setting [ 33 ]. The cultivars of roselle in this study have similar or greater heights than those reported previously ( Table 2 ).…”

Réponse au Di-Ammonium Phosphate des Rendements en Feuilles, en Calices et en Graines des Écotypes d’oseille de Guinée (Hibiscus sabdariffa L.) au Niger

“…Du point de vue nutritionnelle, les feuilles sont riches en Ca, K, Mg, N et P (Atta et al, 2010a). Les calices sont plus riches en Ca, K, Mn, Na et Fe que les graines (Atta et al, 2013).…”

Sparkling ′′wine′′ production tests from extract of Hibiscus sabdariffa L. flowers

“…La plante est très répandue dans les régions tropicales et en particulier en Afrique de l'Ouest où elle est beaucoup consommée (Sié et al, 2009). Les calices rouges sont beaucoup utilisés dans la production de boisson rafraîchissante tandis que les calices et les feuilles de type vert très riches en vitamine C et en calcium (Atta et al, 2010 ;Diouf et al 2017) sont utilisées dans les soupes et les ragoûts de légumes (Babalola, 2001). Plusieurs études ont été menées pour l'amélioration de la croissance végétative des différents organes de la plante de Hibiscus sabdariffa L qui jouent d'importants rôles dans la sécurité alimentaire en Afrique (Lepengue et al, 2012a ;Lepengue et al, 2012b ;Kaka Kiari et al, 2019).…”