Potassium Fertilization Stimulates Sucrose-to-Starch Conversion and Root Formation in Sweet Potato (Ipomoea batatas (L.) Lam.)

Gao, Yang; Tang, Zhonghou; Xia, Houqiang; Sheng, Minfei; Liu, Ming; Pan, Shenyuan; Li, Zongyun

doi:10.3390/ijms22094826

Cited by 14 publications

(19 citation statements)

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“…The N content in leaves and roots showed a quadratic response to K content (Table 1; Figure 2), suggesting that K deficiency affected N metabolism in sweet potatoes, as previously reported in cotton (Gossypium hirsutum L.) (Hu et al, 2016). Gao et al (2021) reported that K affected starch-sucrose metabolism in tuberous roots; in this study, K deficiency increased K + efflux from sweet potato roots, resulting in the decline of K content and accumulation in roots, stems, leaves, and the whole plants (Table 1; Figures 1, 3). These results indicated that K deficiency repressed K absorption in the roots of sweet potatoes and abated long-distance K transport from roots to stems to leaves, and similar results were reported in cotton (Hu et al, 2016).…”

Section: Discussionmentioning

confidence: 55%

“…Sweet potato is widely cultivated in China for its high stability and wide adaptability and has higher K requirements for optimum yield than cereals and oilseeds, followed by N and phosphorus (Tang et al, 2015). Previous studies have reported that K application increased chlorophyll content and net photosynthetic rate in sweet potato leaves (Chen et al, 2013), stimulated sucrose-to-starch conversion and N accumulation, and finally promoted starch accumulation and storage root yield (Wang et al, 2016b;Wang et al, 2017;Gao et al, 2021). Under hydroponic conditions, K deficiency suppressed biomass accumulation in blades, petioles, and roots in all three cultivars with low K-use efficiency, high K-uptake efficiency, and high K-use efficiency, and impaired phloem loading due to K deficiency associated with a decline in photosynthetic rate and decreased carbohydrate supply from blades, resulting in restricted root growth (Wang et al, 2018).…”

Section: Introductionmentioning

confidence: 98%

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Potassium deficiency causes more nitrate nitrogen to be stored in leaves for low-K sensitive sweet potato genotypes

et al. 2022

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In order to explore the effect of potassium (K) deficiency on nitrogen (N) metabolism in sweet potato (Ipomoea batatas L.), a hydroponic experiment was conducted with two genotypes (Xushu 32, low-K-tolerant; Ningzishu 1, low-K-sensitive) under two K treatments (−K, <0.03 mM of K+; +K, 5 mM of K+) in the greenhouse of Jiangsu Normal University. The results showed that K deficiency decreased root, stem, and leaf biomass by 13%–58% and reduced whole plant biomass by 24%–35%. Compared to +K, the amount of K and K accumulation in sweet potato leaves and roots was significantly decreased by increasing root K+ efflux in K-deficiency-treated plants. In addition, leaf K, N, ammonium nitrogen (NH4+–N), or nitrate nitrogen (NO3−–N) in leaves and roots significantly reduced under K deficiency, and leaf K content had a significant quadratic relationship with soluble protein, NO3−–N, or NH4+–N in leaves and roots. Under K deficiency, higher glutamate synthase (GOGAT) activity did not increase amino acid synthesis in roots; however, the range of variation in leaves was larger than that in roots with increased amino acid in roots, indicating that the transformation of amino acids into proteins in roots and the amino acid export from roots to leaves were not inhibited. K deficiency decreased the activity of nitrate reductase (NR) and nitrite reductase (NiR), even if the transcription level of NR and NiR increased, decreased, or remained unchanged. The NO3−/NH4+ ratio in leaves and roots under K deficiency decreased, except in Ningzishu 1 leaves. These results indicated that for Ningzishu 1, more NO3− was stored under K deficiency in leaves, and the NR and NiR determined the response to K deficiency in leaves. Therefore, the resistance of NR and NiR activities to K deficiency may be a dominant factor that ameliorates the growth between Xushu 32 and Ningzishu 1 with different low-K sensitivities.

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Section: Discussionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 98%

Potassium deficiency causes more nitrate nitrogen to be stored in leaves for low-K sensitive sweet potato genotypes

et al. 2022

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“…Low-K + stress affects the growth and development of sweet potato, and it needs more potassium to promote the storage root formation and bulking [50,51,52,53]. The production of sweet potato is remarkably promoted when supplied su cient K [54]. The genome-wide gene expression pro les have been performed in rice [55], [56], wheat [57], pear [58], [59], cotton[60], and tomato [61].…”

Section: Discussionmentioning

confidence: 99%

“…This not only affects yield formation, but also quality parameters, for example in wheat, potato and grape [29]. In sweet potato, it was reported that K + application promoted starch accumulation and storage root yield through regulating the activities and genes transcription in the sucrose-to-starch conversion [30]. A number of studies have shown various effects of different potassium forms on fruits yield, increasing yield of K-treated trees was correlated with an increase in fruit weight [28,31].…”

Section: Introductionmentioning

confidence: 99%

Transcriptome Analysis of Sweet Potato Responses To Potassium Deficiency

Wang

Tan

Song

et al. 2021

Preprint

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Background: Potassium is one of the three essential nutrients and is regarded as a main limited factor for growth and development in plant. Sweet potato (Ipomoea batatas L.) is one of the seven major food crops grown worldwide, and it is both a nutrient-rich food and a bioenergy crop. Sweet potato is a typical “K-favoring” crop, and the level of potassium ion (K+) supplementation directly influences its production. However, little is known about the transcriptional changes in sweet potato genes under low-K+ condition. To uncover the effect of low-K+ stress, we analyzed the transcriptomic profiles of sweet potato roots in response to K+ deficiency.Result: The roots of sweet potato seedlings with or without K+ treatment were harvested and used for transcriptome analyses. The results showed 559 differently expressed genes (DEGs) in low and high K+ groups. Among the DEGs, 336 were upregulated and 223 downregulated. These DEGs were involved in transcriptional regulation, calcium binding, redox-signaling, biosynthesis, transport, and metabolic process. In the result, some new genes were founded that involved in low-K+ stress, which can be further investigated to improve low K+ tolerance in plant. Confirmation of RNA-seq results using qRT-PCR displayed a high level of consistency between the two experiments. Our analysis showed that many auxin-related genes, ethylene-related genes and jasmonic acid-related genes responsed to K+ deficiency, indicated that these hormones may play more important roles in K+ nutrient signaling in sweetpotato. Conclusions: According to the transcriptome data, fewer sweetpotato genes showed transcriptional changes in response to low-K+ stress. However, the expression level of some kinases, transporters, transcription factors, hormone-related genes, and plant defense related genes were markedly changed, suggesting that they play important roles during K+ deficiency. This study identifes potential genes for genetic improvement of low-K+ stress and provides valuable insight into the molecular mechanisms regulating low K+ tolerance in sweet potato. Further research is required to clarify the founction of these significant changed genes under low-K+ stress.

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“…K application is positively correlated with the accumulation of sweet potato starch. K application spurs tuber yield through starch accumulation by setting activity and transcription of several controlling genes in the conversion of sucrose into starch [43].…”

Section: A Production Function Analysis Of Stochastic Frontiermentioning

confidence: 99%

Determination of Effectiveness and Efficiency of Production Factors in Sweet Potato Farming in Lamongan, Indonesia

Hamidah¹,

Rahayu²,

Sutrisno³

et al. 2021

International Journal on Advanced Science, Engineering and Information Technology

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Food crops have a strategic role in agricultural development, covering food security growth, opening up employment opportunities, and income sources in regional and national economies. This research aims to determine the relationship patterns of sweet potato farming production factors. This research utilized a quantitative approach with the survey method. The data were obtained through questionnaires, and the sampling method used a census of 348 respondent farmers in six sweet potato center villages. The Maximum Probability Estimation frontier 4.1 method was employed to calculate the technical efficiency of sweet potato farming. The results showed that the production factors significant at the trust level of 99 percent, 90 percent, and positive value for sweet potato production in Lamongan Regency, Indonesia, were land area production, Urea fertilizer, Phonska fertilizer, ZA fertilizer, and SP36 fertilizer. The technical efficiency attainment level of sweet potato farming was very high, indicating that sweet potato farming in the research was efficient, with an average technical efficiency of 0.90 percent. The achievement level of allocative efficiency on sweet potato farming was relatively low, implying that sweet potato farming was inefficient, with an average localized efficiency of 0.50 percent. The economic efficiency of sweet potato farming was very low, depicting inefficient sweet potato farming, with an average economic efficiency of 0.48 percent. Therefore, sweet potato farmers must optimize land use, ZA, Urea, SP36, and Phonska to produce sweet potatoes optimally to support food security.

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Potassium Fertilization Stimulates Sucrose-to-Starch Conversion and Root Formation in Sweet Potato (Ipomoea batatas (L.) Lam.)

Cited by 14 publications

References 38 publications

Potassium deficiency causes more nitrate nitrogen to be stored in leaves for low-K sensitive sweet potato genotypes

Potassium deficiency causes more nitrate nitrogen to be stored in leaves for low-K sensitive sweet potato genotypes

Transcriptome Analysis of Sweet Potato Responses To Potassium Deficiency

Determination of Effectiveness and Efficiency of Production Factors in Sweet Potato Farming in Lamongan, Indonesia

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