Sweet potato leaf tips have high nutritional value,and exploring the differences in the metabolic profiles of leaf tips among different sweet potato varieties can provide information to improve their qualities.In this...Sweet potato leaf tips have high nutritional value,and exploring the differences in the metabolic profiles of leaf tips among different sweet potato varieties can provide information to improve their qualities.In this study,a UPLC-Q-Exactive Orbitrap/MS-based untargeted metabolomics method was used to evaluate the metabolites in leaf tips of 32 sweet potato varieties.Three varieties with distinct overall metabolic profiles(A01,A02,and A03),two varieties with distinct profiles of phenolic acids(A20 and A18),and three varieties with distinct profiles of flavonoids(A05,A12,and A16)were identified.In addition,a total of 163 and 29 differentially expressed metabolites correlated with the color and leaf shape of sweet potato leaf tips,respectively,were identified through morphological characterization.Group comparison analysis of the phenotypic traits and a metabolite-phenotypic trait correlation analysis indicated that the color differences of sweet potato leaf tips were markedly associated with flavonoids.Also,the level of polyphenols was correlated with the leaf shape of sweet potato leaf tips,with lobed leaf types having higher levels of polyphenols than the entire leaf types.The findings on the metabolic profiles and differentially expressed metabolites associated with the morphology of sweet potato leaf tips can provide useful information for breeding sweet potato varieties with higher nutritional value.展开更多
The effects of fermenting, boiling, and steaming processes on the levels of free amino acids, organic acids, antioxidant properties （FRAP and DPPH）, phenolic compounds, and angiotensine converting enzyme （ACE） inh...The effects of fermenting, boiling, and steaming processes on the levels of free amino acids, organic acids, antioxidant properties （FRAP and DPPH）, phenolic compounds, and angiotensine converting enzyme （ACE） inhibition of sweet potato tips were investigated. Seventeen free amino acids were found in the tips. Fermenting, boiling, and steaming processes significantly reduced total free amino acid contents and steaming processes caused smaller losses than fermenting and boiling processes. Five organic acids were investigated in the tips. In comparison with the total organic acid content of unprocessed sweet potato tips, steaming and boiling processes significantly reduced it, while fermenting process increased it. Chlorogenic acid, rutin, and quercetin were investigated in the tips. The total phenolic compounds contents of sweet potato tips significantly increased by steaming and boiling processes, but a substantial loss was caused by fermenting process. A similar result was shown in FRAP value. The result of ACE inhibitory activity indicated that boiling, steaming, and fermenting processes significantly increased ACE inhibitory activity.展开更多
In Zimbabwe sweet potato (Ipomoea batatas L.) production is practiced under different tillage systems with varying vine orientations, which contribute to variable yields. Limited research on yield loss due to these di...In Zimbabwe sweet potato (Ipomoea batatas L.) production is practiced under different tillage systems with varying vine orientations, which contribute to variable yields. Limited research on yield loss due to these different practices is available despite that the majority of farmers are growing sweet potatoes to sustain their livelihoods. A field study was carried out at Midlands State University in the 2013/14 rainy season, to determine the effect of tillage systems and vine orientation on yield of sweet potato. A 2 × 3 factorial treatment structure in a randomized complete block design (RCBD), with three replications was used. Tillage systems had two factors (ridge and mound) and three vine orientations were used (horizontal, fold and loop). Data on storage root length, storage root diameter and storage root weight was subjected to Analysis of Variance (ANOVA) at 5% significance level. There was no interaction (p < 0.05) between tillage systems and vine orientations on storage root diameter, storage root length and storage root yield. The horizontal vine orientation gave statistically significant (p < 0.05) storage roots diameter of width 405 mm. Conversely the loop vine orientation had statistically the least (316 mm) storage root diameter. Horizontal vine orientation had significantly (p < 0.05) wider storage roots than the loop vine orientation. The ridge recorded longer (134.2 mm) mean storage root length, while those from mounds had shorter (115.9 mm) root length. The loop and the horizontal vine orientations recorded statistically the highest (35.5 t/ha and 34.8 t/ha respectively) sweet potato storage root yield. On the other hand, the fold vine orientation obtained significantly the lowest (28.7 t/ha) storage root yield. The research concluded that the horizontal and fold vine orientations had the widest storage root diameter and the ridge had longer storage root lengths. The loop and horizontal vine orientations are recommended in sweet potato production if high yields are to be achieved.展开更多
Sweet potato is an important food crop which contributes to food security. Storage roots are stored in the ground and harvested when needed. In coastal Kenya, the production of the crop is limited by lack of adaptable...Sweet potato is an important food crop which contributes to food security. Storage roots are stored in the ground and harvested when needed. In coastal Kenya, the production of the crop is limited by lack of adaptable varieties and shortage of planting materials at the onset of long rains. The prevailing prices of sweet potato vines for planting present a hindrance for sweet potato cultivation culminating to low acreages by farmers. This study was carried out during the long rains of 2011 to 2013 to determine the effect of variety and size of sweet potato cutting on root yield. Four sweet potato varieties were planted under four stem cutting sizes of four, six, eight and 10 nodes. The four varieties were K135, Bungoma, SPK004 and Mtwapa 8 （check）. The experimental design was a split plot with varieties assigned to main plots and cutting sizes to sub-plots. The number of roots per plant for Bungoma variety was significantly （P 〈 0.05） less than that for the check, and variety K135 showed significantly （P 〈 0.05） higher number of marketable root per plant than the check. The same trend was observed for root yield per hectare. The check variety had the highest percent of dry matter and was significantly higher than that of SPK004 and Bungoma varieties. There were no significant （P 〈 0.05） differences among the stem cutting sizes as regards to number of roots per plant, number of marketable root per plant and percent of dry matter. The cutting size of six nodes gave similar root yield as the recommended eight nodes, and therefore farmers can adopt shorter vines than the recommended, hence saving on the cost of planting materials.展开更多
基金This work was supported by grants from the construction and operation of the Food Nutrition and Health Research Center of Guangdong Academy of Agricultural Sciences,China(XTXM 202205)the earmarked fund for CARS-10Sweetpotato,and the Guangdong Modern Agro-industry Technology Research System,China(2022KJ111).
文摘Sweet potato leaf tips have high nutritional value,and exploring the differences in the metabolic profiles of leaf tips among different sweet potato varieties can provide information to improve their qualities.In this study,a UPLC-Q-Exactive Orbitrap/MS-based untargeted metabolomics method was used to evaluate the metabolites in leaf tips of 32 sweet potato varieties.Three varieties with distinct overall metabolic profiles(A01,A02,and A03),two varieties with distinct profiles of phenolic acids(A20 and A18),and three varieties with distinct profiles of flavonoids(A05,A12,and A16)were identified.In addition,a total of 163 and 29 differentially expressed metabolites correlated with the color and leaf shape of sweet potato leaf tips,respectively,were identified through morphological characterization.Group comparison analysis of the phenotypic traits and a metabolite-phenotypic trait correlation analysis indicated that the color differences of sweet potato leaf tips were markedly associated with flavonoids.Also,the level of polyphenols was correlated with the leaf shape of sweet potato leaf tips,with lobed leaf types having higher levels of polyphenols than the entire leaf types.The findings on the metabolic profiles and differentially expressed metabolites associated with the morphology of sweet potato leaf tips can provide useful information for breeding sweet potato varieties with higher nutritional value.
基金supported by the Independent Innovation of Agricultural Sciences in Jiangsu Province, China (CX [09] 628)
文摘The effects of fermenting, boiling, and steaming processes on the levels of free amino acids, organic acids, antioxidant properties （FRAP and DPPH）, phenolic compounds, and angiotensine converting enzyme （ACE） inhibition of sweet potato tips were investigated. Seventeen free amino acids were found in the tips. Fermenting, boiling, and steaming processes significantly reduced total free amino acid contents and steaming processes caused smaller losses than fermenting and boiling processes. Five organic acids were investigated in the tips. In comparison with the total organic acid content of unprocessed sweet potato tips, steaming and boiling processes significantly reduced it, while fermenting process increased it. Chlorogenic acid, rutin, and quercetin were investigated in the tips. The total phenolic compounds contents of sweet potato tips significantly increased by steaming and boiling processes, but a substantial loss was caused by fermenting process. A similar result was shown in FRAP value. The result of ACE inhibitory activity indicated that boiling, steaming, and fermenting processes significantly increased ACE inhibitory activity.
文摘In Zimbabwe sweet potato (Ipomoea batatas L.) production is practiced under different tillage systems with varying vine orientations, which contribute to variable yields. Limited research on yield loss due to these different practices is available despite that the majority of farmers are growing sweet potatoes to sustain their livelihoods. A field study was carried out at Midlands State University in the 2013/14 rainy season, to determine the effect of tillage systems and vine orientation on yield of sweet potato. A 2 × 3 factorial treatment structure in a randomized complete block design (RCBD), with three replications was used. Tillage systems had two factors (ridge and mound) and three vine orientations were used (horizontal, fold and loop). Data on storage root length, storage root diameter and storage root weight was subjected to Analysis of Variance (ANOVA) at 5% significance level. There was no interaction (p < 0.05) between tillage systems and vine orientations on storage root diameter, storage root length and storage root yield. The horizontal vine orientation gave statistically significant (p < 0.05) storage roots diameter of width 405 mm. Conversely the loop vine orientation had statistically the least (316 mm) storage root diameter. Horizontal vine orientation had significantly (p < 0.05) wider storage roots than the loop vine orientation. The ridge recorded longer (134.2 mm) mean storage root length, while those from mounds had shorter (115.9 mm) root length. The loop and the horizontal vine orientations recorded statistically the highest (35.5 t/ha and 34.8 t/ha respectively) sweet potato storage root yield. On the other hand, the fold vine orientation obtained significantly the lowest (28.7 t/ha) storage root yield. The research concluded that the horizontal and fold vine orientations had the widest storage root diameter and the ridge had longer storage root lengths. The loop and horizontal vine orientations are recommended in sweet potato production if high yields are to be achieved.
文摘Sweet potato is an important food crop which contributes to food security. Storage roots are stored in the ground and harvested when needed. In coastal Kenya, the production of the crop is limited by lack of adaptable varieties and shortage of planting materials at the onset of long rains. The prevailing prices of sweet potato vines for planting present a hindrance for sweet potato cultivation culminating to low acreages by farmers. This study was carried out during the long rains of 2011 to 2013 to determine the effect of variety and size of sweet potato cutting on root yield. Four sweet potato varieties were planted under four stem cutting sizes of four, six, eight and 10 nodes. The four varieties were K135, Bungoma, SPK004 and Mtwapa 8 （check）. The experimental design was a split plot with varieties assigned to main plots and cutting sizes to sub-plots. The number of roots per plant for Bungoma variety was significantly （P 〈 0.05） less than that for the check, and variety K135 showed significantly （P 〈 0.05） higher number of marketable root per plant than the check. The same trend was observed for root yield per hectare. The check variety had the highest percent of dry matter and was significantly higher than that of SPK004 and Bungoma varieties. There were no significant （P 〈 0.05） differences among the stem cutting sizes as regards to number of roots per plant, number of marketable root per plant and percent of dry matter. The cutting size of six nodes gave similar root yield as the recommended eight nodes, and therefore farmers can adopt shorter vines than the recommended, hence saving on the cost of planting materials.
