Sweetpotato in China

Zhang, L.; Wang, Q.; Liu, Q.

doi:10.1007/978-1-4020-9475-0_15

Cited by 38 publications

(32 citation statements)

References 42 publications

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“…More than 105 million tonnes of sweet potatoes are produced globally each year, with 95% being grown in developing countries (CIP 2010). China usually accounts for 70% and 85% of total area and yield, respectively (Zhang et al 2009). As one of the most promising bioenergy crops, sweet potato plays an important role in the development of first-generation biofuels in China (Ziska et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Molecular Regulation of Storage Root Formation and Development in Sweet Potato

Ravi¹,

Chakrabarti²,

Makeshkumar³

et al. 2014

Horticultural Reviews: Volume 42

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Storage root formation and development in sweet potato [Ipomoea batatas (L) Lam. Convolvulaceae] is a complex process characterized by the cessation of root elongation, genesis of vascular cambium, anomalous and interstitial cambia, and increase in radial growth by increased cell proliferation and expansion concomitant with the massive deposition of starch and storage proteins that eventually result in storage root enlargement. Phytohormones play a crucial role in the formation of storage roots. Three class I knotted-like homeobox (KNOX1) genes-SRF1, SRF5, and SRF6-modulate carbohydrate metabolism and cell division. The genes Ibkn1 and Ibkn2 activate cytokinin biosynthesis. Transcription factors derived from MADS box genes IbMADS1, IbMADS3, IbMADS4, and IbAGL17 induce signal transduction pathway leading to storage root formation and development. The occurrence of SRD1 transcripts mainly in the actively dividing cells, including the vascular and cambium cells, and the increase in endogenous indole-3-acetic acid (IAA) content and three auxin-inducible AUX/IAA gene transcripts concomitantly with SRD1 transcripts suggest the involvement of SRD1 during the early stage of storage root development. Along with IbMADS1 induction, two storage root marker genes, which encode a major storage protein sporamin and IbAGPase that encodes AGPase for ADP-glucose production in starch biosynthesis, are up-regulated during the early period of storage root development. A class III HD-Zip protein 8 regulating the development of cambia and secondary vascular tissues, a short-root protein that is a key regulator in root 157 radial patterning, meristem maintenance, and asymmetric cell division, the expansin gene IbEXP1 encoding a cell wall loosening protein, genes encoding cyclin A-and cyclin D-like proteins, and five cyclin-dependent kinases are upregulated during storage root formation. Genes encoding ADP-glucose pyrophosphorylase, granule-bound starch synthase, starch synthase, and phosphoglucomutase are up-regulated, whereas genes encoding pyruvate decarboxylase and lactate dehydrogenase are down-regulated during storage root development. The endogenous sucrose levels influence the expression of two AGPase isoforms: ibAGP1 and ibAGP2. The expression of cell wall-bound (extracellular/apoplast) acid invertase activity gene (cwINV) predominates during early period, whereas the expression of cytosolic activity of sucrose synthase gene (SuSy) predominates during later period of storage root enlargement. The competition between lignification and formation of anomalous cambia and the associated starchaccumulating cells determine storage root development. Genes encoding enzymes such as coumaroyl-CoA synthase, caffeoyl-CoA O-methyltransferase, and cinnamyl alcohol dehydrogenase during storage root formation reduce lignification in tissue sections of storage roots.

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Section: Introductionmentioning

confidence: 99%

Molecular Regulation of Storage Root Formation and Development in Sweet Potato

Ravi¹,

Chakrabarti²,

Makeshkumar³

et al. 2014

Horticultural Reviews: Volume 42

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“…ranks as the seventh most important staple crop in in annual production worldwide and the fifth in developing countries after rice, wheat, maize and cassava (Loebenstein, 2009). The crop serves as food, vegetables, animal feed and industrial raw materials for more than 100 countries (Zhang et al, 2009). In Africa and Asia, thousands of people depend on sweetpotato for food security (Loebenstein, 2009;Zhang et al, 2009).…”

mentioning

confidence: 99%

“…The crop serves as food, vegetables, animal feed and industrial raw materials for more than 100 countries (Zhang et al, 2009). In Africa and Asia, thousands of people depend on sweetpotato for food security (Loebenstein, 2009;Zhang et al, 2009). Conventional breeding methods for sweetpotato improvement sweetpotato is limited by the plant's complicated hexaploidy and low seed production as a consequence of compatibility, sterility and special physiological requirements for flowering (Sihachakr et al, 1997).…”

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confidence: 99%

Evaluation of the Phosphomannose Isomerase-Based Selection System for Genetic Transformation of Sweetpotato

et al. 2015

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Article InformationIn response to increased public concern on antibiotic or herbicide resistance genes usage in genetically modified plants, mannose was evaluated as selectable agent for the genetic transformation of sweetpotato. Nontransformed sweetpotato stem explants of cv. KSP36 were cultured on media containing various combinations and concentrations sucrose and mannose ranging from 0 to 30 g/l. Likewise, efficacy of hygromycin and kanamycin as selection agents for transformation of sweetpotato was evaluated on media containing varying concentrations of antibiotics ranging 0 to 100 mg/l. Selection agent effectiveness was determined by detecting the minimal concentration of the selection agent required to fully inhibit sweetpotato calli growth. Hygromycin was the most effective selection agent as it inhibited cell growth at concentrations above 20 mg/l. Kanamycin was moderately effective as it inhibited cell growth at 60 mg/l. Sweetpotato calli were able to grow and even produce embryos even when mannose was the only source of carbohydrates.

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“…In temperate regions sweetpotato can only be grown as a summer annual while storage roots are stored during winter, bedded in early spring, and slips or sprouts are used for propagation. These are asexually produced from whole storage roots sown in heated beds for spring production (Zhang et al 2009). Temperature is maintained at 28°C for maximum slip production either using hot water or electricity (Khan et al 2008).…”

Section: Statement Of Parts Of the Thesis Submitted To Qualify For Thmentioning

confidence: 99%

“…In the temperate regions, sweetpotato can only be grown as a summer annual while storage roots (seed) are stockpiled during the winter, bedded in early spring, and shoots or slips are cut from the sprouts which are used for propagation. In China, however, heated propagation beds are often employed to produce the stock shoots for spring production, while non-heated systems are used for summer and autumn sweetpotato production (Zhang et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Studies on propagation materials and growing conditions for sweetpotato [Ipomoea Batatas (L.) Lam] production

Atu¹

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A thesis submitted for the degree of Master of Philosophy atThe University of Queensland in 2013 School of Agriculture and Food Sciences i ABSTRACTSweetpotato propagation is cultivated through use of sprout (slip) or vine cutting. Production of sprout is increased by best selection of storage root sizes to optimize growth and yield.Cultivars of different storage root sizes produced variable numbers of sprouts, varying in length and thickness and to explore this four storage root sizes in an open field bed were trialed. Beauregard and Northern Star storage roots selected from the large, medium, smallmedium and small storage root category sown in bed and sprouts at three length classes were first measured 47 days after sowing. The next three harvests were measured at 21 days interval while the fifth harvest was at 44 days after the fourth, calculated from the Growing Degree Days (GDD) units. Beauregard produced significantly higher number of sprout at >20 cm but fewer > 35 cm length than Northern Star. The sprout length 20 -35 cm class increased for both varieties after Harvest 1 but Beauregard tended to increase less for this class than Northern Star with progressive harvests. In the fifth harvest 20 -35 cm length class for both varieties had reduced although Northern Star produced more for this class than Beauregard. A significantly higher number of sprouts were produced by large root but not significantly different from the medium root. Sprout categories for < 20 and 20 -35 cm were greater for large and medium roots than smaller roots. The thickness of sprout progressively decreased in numbers as storage roots size decreased. Sprouts longer than 20 cm are considered best propagation material for farmers and to achieve this within the best possible short period is an advantage to farmers.The experiment study on seven sweetpotato varieties for pathogen tested (PT) and nonpathogen tested (NPT) was investigated at 60 days after planting (DAP), 120 DAP and 220 DAP for yield differences. There was no significant difference (P < 0.05) for all varieties for early root growth at 60 (DAP). No significant difference was observed for PT and Non-PT for the marketable yield but a significant increase in non-marketable yield at 120 DAP and 220 DAP for PT and non-PT was presumably due to virus infection.The number of marketable storage root production declined as the crop grew older but the opposite trend occurred for the non-marketable yield which increased three fold in the final harvest compared to the previous harvest. Northern Star produced the highest number and weight of marketable and non-marketable roots compared to the other six varieties.ii LD02 and Beauregard were the second best varieties in terms of marketable roots while L49, Vekeoli and Lola Tonga had the least potential. Northern Star followed by Beauregard and LD02 proved their supremacy by their ability to partition dry matter to bulk storage root.Beauregard was the only variety observed with SPFMV infection in the foliage.High soil temperatures affected the...

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Sweetpotato in China

Cited by 38 publications

References 42 publications

Molecular Regulation of Storage Root Formation and Development in Sweet Potato

Molecular Regulation of Storage Root Formation and Development in Sweet Potato

Evaluation of the Phosphomannose Isomerase-Based Selection System for Genetic Transformation of Sweetpotato

Studies on propagation materials and growing conditions for sweetpotato [Ipomoea Batatas (L.) Lam] production

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