Xuzhou Sweetpotato Research Center

Tongshan, China

Xuzhou Sweetpotato Research Center

Tongshan, China
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Tang Z.,Xuzhou Sweetpotato Research Center | Tang Z.,Nanjing Agricultural University | Zhang A.,Xuzhou Sweetpotato Research Center | Chen X.,Xuzhou Sweetpotato Research Center | And 4 more authors.
Scientia Agricultura Sinica | Year: 2017

[Objective] Sweetpotato (Ipomoea batatas (L.) Lam) is a typical K-preferred starchy root crop. Potassium (K) deficiency (namely low potassium), an important abiotic stress in plants, has become a major limiting element for obtaining crop high yield and good quality. However, in China, K deficiency in soils exists commonly in sweetpotato-growing areas. Sweetpotato starch utilization is closely related with its physico-chemical properties. The influence of low potassium on starch physic-chemical properties was investigated in an experiment conducted by using three sweetpotato cultivars with different potassium utilization efficiencies (KUE) in response to low potassium(K) field condition, aiming at providing reference for improving sweetpotato root properties and potassium utilization efficiency. [Method] Three sweetpotato cultivars with different potassium utilization efficiencies (KUE) were chosen and cultivated under different potassium field condition, including two treatments (low potassium treatment, LK, and normal potassium treatment, CK). [Result] The results showed that under low K condition, the main components (amylose, amylopectin, nitrogen, total phosphorus and total lipid) in sweetpotato storage root starch changed to a certain extent. There were some differences among the three cultivars in the main components. Three distribution peaks in ≤2.50 μm, 2.50-5.00 μm and 5.00-30.00 μm were observed in starch granule size obviously. The slight decrease was observed in the whole average granule size under low K, which of Xushu32 had the least decrease in volume distribution. However, there was a significant difference in decrease of average granule size of Ningzishu1. The percentage, average granule size and peak value of different granule sizes in three distributions had some differences among three cultivars. Starch T0 (gelatinization temperature), Tp (peak temperature) and ?H (heat enthalpy) were basicially lower than that in CK treatment, and Ningzishu1 had significant differences in the three characteristic values. Peak viscosity and breakdown viscosity in three genotypes had an obvious decrease. Hot paste viscosity, cool paste viscosity in Xushu18 and Ningzishu1 significantly increased, but Xushu32 was on the contrary. Moisture absorption degree of starches in three genotypes was reduced differently. There was a significant difference in the decline of moisture absorption in Xushu18 and Ningzishu1. In addition, swelling power of starch increased differently in three storage root starchs. There was a significant difference in a rise of swelling power of starch in Ningzishu1. Xushu32 had high starch swelling power, but low K had a little effect on it. Correlation analysis showed that the main physico-chemical indicators of sweetpotato starch are closely related. The low K changes starch compositions and particle sizes in sweetpotato root, which led to different degrees of influence on starch gelatinization properties and thermal properties. [Conclusion] The results of the study findings indicated that potassium is a key plant element influencing sweetpotato starch physico-chemical properties. Some obvious effects on physico-chemical properties and main components exist in storage root starch under low K stress. The responses of sweetpotato genotypes differing in potassium utilization efficiency to low K stress are different.

Yu X.-X.,China Agricultural University | Zhao N.,China Agricultural University | Li H.,China Agricultural University | Jie Q.,China Agricultural University | And 4 more authors.
Journal of Integrative Agriculture | Year: 2014

Sweetpotato (Ipomoea batatas (L.) Lam.) breeding is challenging due to its genetic complexity. In the present study, interval mapping (IM) and multiple quantitative trait locus (QTL) model (MQM) analysis were used to identify QTLs for starch content with a mapping population consisting of 202 F1 individuals of a cross between Xushu 18, a cultivar susceptible to stem nematodes, with high yield and moderate starch, and Xu 781, which is resistant to stem nematodes, has low yield and high starch content. Six QTLs for starch content were mapped on six linkage groups of the Xu 781 map, explaining 9.1-38.8% of the variation. Especially, one of them, DMFN_4, accounted for 38.8% of starch content variation, which is the QTL that explains the highest phenotypic variation detected to date in sweetpotato. All of the six QTLs had a positive effect on the variation of the starch content, which indicated the inheritance derived from the parent Xu 781. Two QTLs for starch content were detected on two linkage groups of the Xushu 18 map, explaining 14.3 and 16.1% of the variation, respectively. They had a negative effect on the variation, indicating the inheritance derived from Xu 781. Seven of eight QTLs were co-localized with a single marker. This is the first report on the development of QTLs co-localized with a single marker in sweetpotato. These QTLs and their co-localized markers may be used in marker-assisted breeding for the starch content of sweetpotato. © 2014 Chinese Academy of Agricultural Sciences.

Zhao N.,China Agricultural University | Zhai H.,China Agricultural University | Yu X.-X.,China Agricultural University | Liu Z.-S.,China Agricultural University | And 4 more authors.
Journal of Integrative Agriculture | Year: 2013

Sequence-related amplification polymorphism (SRAP) markers closely linked to stem nematode resistance gene were developed in sweetpotato, Ipomoea batatas (L.) Lam. Using bulked segregant analysis (BSA), 200 SRAP primer combinations were screened with the resistant and susceptible bulked DNA from the 196 progenies of an F1 single-cross population of resistant parent Xu 781×susceptible parent Xushu 18, 77 of them showed polymorphic bands between resistant and susceptible DNA. Primer combinations detecting polymorphism between the two bulks were used to screen both parents and 10 individuals from each of the bulks. The results showed that primer combination A9B4 produced 3 specific bands in the resistant plants but not in the susceptible plants, suggesting that the markers, named Nsp1, Nsp2 and Nsp3, respectively, linked to a gene for stem nematode resistance. Primer combination A3B6 also produced a SRAP marker named Nsp4 linking to the resistance gene. Amplified analysis of the 196 F1 individuals indicated that the genetic distance between these markers and the resistance gene was 4.7, 4.7, 6.3, and 9.6 cM, respectively. © 2013 Chinese Academy of Agricultural Sciences.

Peng D.,Shandong University | Chen X.,Xuzhou Sweetpotato Research Center | Yin Y.,Shandong University | Lu K.,Shandong University | And 4 more authors.
Field Crops Research | Year: 2014

Lodging is an important constraint limiting wheat yields and quality by bending or breaking stems on wheat (Triticum aestivum L.) production worldwide. This study was conducted to determine whether lignin accumulation and lodging resistance of winter wheat could be affected by application of paclobutrazol (PP333) or gibberellin acid (GA3) at stem elongation stage (DC 3.0). Two winter wheat cultivars, Jimai22 (lodging-tolerant cultivar; JM22) and Shannong16 (lodging-susceptible cultivar; SN16), were used to investigate the effect of exogenous hormones on wheat lodging behavior, lignin accumulation in culms and its relation to lodging resistance. Results showed that application of PP333 significantly reduced plant height and the length of basal second internode, while GA3 had the opposite effect. Lignin accumulation was positively and significantly correlated with the breaking strength of internode and culm lodging resistance index (CLRI). PP333 significantly increased lignin accumulation and its related enzymes activities in the basal second internode, and also increased the diameter, wall thickness, filling degree of the internode, thus the breaking strength and lodging resistance of wheat increased. Whereas, GA3 caused opposite effect on those characteristics. These results suggested that the exogenous PP333 or GA3 application significantly changed the risk of lodging occurred not only by altering the plant height but also by altering the physical strength of the basal part of the culm internode, especially, altering the lignin accumulation and its related enzymes activities in basal internode. © 2013 Elsevier B.V.

Chen E.,Shandong Agricultural University | Wang Z.,Shandong Agricultural University | Yin Y.,Shandong Agricultural University | Guo J.,Shandong Agricultural University | And 8 more authors.
Journal of Agricultural Science | Year: 2013

The high molecular weight glutenin subunits (HMW-GS) and glutenin macropolymer (GMP) in wheat grain are important characteristics that affect the quality of wheat products. Light intensity, as one of the environmental factors affecting grain yield and quality, has been studied extensively; however, little is known about its impact on HMW-GS and distribution of GMP granules in wheat grain. In the present study, two strong-gluten winter wheat cultivars with different subunit compositions were used to evaluate the effect of shading at different grain-filling stages on changes in HMW-GS and distribution of GMP granules in wheat grains. No effects of shading on initial formation time of each individual subunit were found; they responded similarly to shading with an increase in relative content, though the accumulation amount per grain of each individual subunit was decreased due to a decrease in grain weight induced by shading. Shading at different grain-filling stages, especially at the middle grain-filling stage, led to a significant increase in GMP content during grain filling; however, the proportions (by volume, number and surface area) of the larger GMP granules were increased by shading at middle and late grain-filling stages and decreased by shading at early grain-filling stage. It was also found that the content of total HMW-GS was positively correlated with volume proportions of larger GMP granules and negatively correlated with volume proportions of small GMP granules, which indicated that the pattern of response of distribution of GMP granules to shading was closely related to the regulatory effect of shading on the HMW-GS. Copyright © 2012 Cambridge University Press.

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