-
Figure 1.
Post-harvest storage losses, biochemical and molecular approaches associated with yam tubers.
-
Nutrient Percentage (%) Reference Starch 75.6−84.3 [16,17] Protein 2.62−10 [16,18] Fat 0.22−1.71 [16,19] Crude fibre 0.17−1.8 [16,17] Amylose 15.1−27.0 [20] Aspartic acid 5.21−9.36 [21] Glutamic acid 3.20−8.12 [21] Lipid 0.03−10.2 [10] Ash 2.50−4.90 [22] Vitamin C 0.013−0.025 [17] Phytic acid 0.059−0.20 [17] Total oxalate 0.49 -0.78 [17] K 0.25−0.56 [23] Na 0.0041−0.018 [23] P 0.033−0.062 [23] Ca 0.14−0.047 [23] Mg 0.018−0.027 [23] Cu 0.0001−0.00021 [23] Fe 0.00039−0.0029 [23] Mn 0.00014−0.00035 [23] Zn 0.00022−0.00053 [23] Table 1.
Nutritional and antinutritional content in Dioscorea sp.
-
Dioscorea sp. Disease Reference Dioscorea bulbifera Goiter, skin infections & oncological diseases [36] Dioscorea nipponica Arthritis, cough, asthma, & circulatory disorders, reduce pain & inflammation [37] Dioscorea villosa Intestinal disorders & hormone replacement therapy [24] Dioscorea birmanica Chronic diseases [38] Dioscorea septembola Treatment of gout [39] Dioscorea hispida Chemotherapy, blood glucose [40, 41] Dioscorea batatas, Dioscorea rotundata and Dioscorea communis Antifungal and antioxidant [42, 43] Dioscorea digitata Syphilis, gonorrhoea, hydrocele, goiter, piles, dysentery. [44] Dioscorea alata Piles, weakness, kill stomach worm [45, 46] Dioscorea belophylla (Prain) Fever, malaria, headache, and dysentery [47] Dioscorea dumetorum Jaundice [48] Dioscorea pentaphylla Digestive tract problems,
skin infections[24,49] Dioscorea pubera Weakness [49] Dioscorea hamiltonii Piles [50] Table 2.
Medicinal properties of Dioscorea sp.
-
Species Treatment Parameter Quantitative data Reference Effects of storage structures, storage temperature and duration Dioscorea rotundata Underground pit structure
(25 °C, 24 weeks)Increased wight loss 13.2%−33.4% [70] Dioscorea rotundata cv. Oshei and Dioscorea dumetorum cv. Jakiri Prevailing tropical ambient conditions (18−31 °C, 16 weeks) Increased weight loss
Decreased in starch content31%
3.5%−4.5%[71] Dioscorea alata and Dioscorea esculenta (29 °C, 21 weeks) Increased weight loss
Decreased proteins, starch etc.−
−[74] Dioscorea
roundata cv. GiwaYam barn
(fluctuating temperature, 26 weeks)Increased rotting loss
Increased weight loss
Reduction in nutritional content12%
4.7%
−[75] Dioscorea cayenensis rotundata complex cv. Krenglè and D. alata cv. Florido Heap aired store and stored under prevailing tropical ambient conditions (26.5 °C, 26 weeks) Increased reducing sugars
Increased total sugars7%−9%
1%[80] Dioscorea cayenensis rotundata complex cv. Krenglè and cv. Kangba Heap aired store and stored under prevailing tropical ambient conditions (26.5 °C, 26 weeks) Increased amylase and cellulase
Decreased α-mannosidases and phospatases− [81] Effects of fungicides/pesticides/medicinal plants extracts etc. Dioscorea rotundata cv. Imola and cv. Akpaji Pre-planting treatment with neem extract, pesticides, and hot water
(17 weeks)Decreased rotting loss
Decreased weight lossApprox. 50% reduced
Approx. 50% reduced[69] Dioscorea rotundata cv.
PoirAmbient room temperature
(30 ± 5 °C, 22 weeks)
Trichoderma harzianumControl on fungal pathogens Paired treatments produced 2.22% (T. harzianum × F. oxysporum) and 6.67% (T. harzianum × A. niger) rots [77] Dioscorea rotundata cv. abii Medicinal plants and Apron plus 50DS (16 weeks) Weight loss
Pathogen infestation40% reduction
0 to 5% reduction[79] Dioscorea rotundata Medicinal plants extracts
(28−30 °C, 4 weeks)Rotting loss and
weight lossDecreased losses [82] Dioscorea sp. Medicinal plants extracts (variable temperature and storage structures) Control of diseases and pests Decrease in disease and pest incidence [83] Table 3.
Effects of post-harvest storage on yam tuber quality.
Figures
(1)
Tables
(3)