Prof. Dr. Guoquan Lu

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Academic Career Length

25Years (2002-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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30 April 2002 in Field Crops Research

Journal Article

Genotypic variation for potassium uptake and utilization efficiency in sweet potato (Ipomoea batatas L.)

Melvin Sidikie George

Guoquan Lu

Weijun Zhou

30 September 2021 in Nanomaterials

Journal Article

Engineered Nanomaterials Suppress the Soft Rot Disease (Rhizopus stolonifer) and Slow Down the Loss of Nutrient in Sweet Potato

About 45% of the world’s fruit and vegetables are wasted, resulting in postharvest losses and contributing to economic losses ranging from $10 billion to $100 billion worldwide. Soft rot disease caused by Rhizopus stolonifer leads to postharvest storage losses of sweet potatoes. Nanoscience stands as a new tool in our arsenal against these mounting challenges that will restrict efforts to achieve and maintain global food security. In this study, three nanomaterials (NMs) namely C₆₀, CuO, and TiO₂ were evaluated for their potential application in the restriction of Rhizopus soft rot disease in two cultivars of sweet potato (Y25, J26). CuO NM exhibited a better antifungal effect than C₆₀ and TiO₂ NMs. The contents of three important hormones, indolepropionic acid (IPA), gibberellic acid 3 (GA-3), and indole-3-acetic acid (IAA) in the infected J26 sweet potato treated with 50 mg/L CuO NM were significantly higher than those of the control by 14.5%, 10.8%, and 24.1%. CuO and C₆₀ NMs promoted antioxidants in both cultivars of sweet potato. Overall, CuO NM at 50 mg/L exhibited the best antifungal properties, followed by TiO₂ NM and C₆₀ NM, and these results were further confirmed through scanning electron microscope (SEM) analysis. The use of CuO NMs as an antifungal agent in the prevention of Rhizopus stolonifer infections in sweet potatoes could greatly reduce postharvest storage and delivery losses.

21 August 2017 in PLOS ONE

Journal Article

Effects of cooking methods on starch and sugar composition of sweetpotato storage roots

Shuying Wei

Guoquan Lu

Heping Cao

Sweetpotato has rich nutrition, good ecological adaptability and high yield. There is a lack of knowledge about the effects of cooking methods on starch and sugar components in elite Chinese cultivars. In this study, sweetpotato storage roots from four cultivars “Xinxiang”, “Jinyu”, “Zimei” and “Yuzishu 263” were treated by baking, boiling and steaming and subsequently analyzed for starch content, amylase activity and sugar contents including glucose, fructose, sucrose and maltose. Results indicated that cooking reduced starch content and final amylase activity and increased reducing sugar content especially maltose content, but did not have significant influence on non-reducing sugar content. These effects were different among the four cultivars and three cooking methods. Baking led to the least starch reduction. Storage roots of “Jinyu” contained the highest amount of sugar content and thus sweetest. Sugar composition analysis suggested that cultivars “Xinxiang” and “Jinyu” belong to high-maltose cultivars. This study may provide useful information for evaluating the cooking quality of sweetpotato cultivars.

1 November 2020 in Journal of Plant Physiology

Journal Article

Changes in cell wall components and polysaccharide-degrading enzymes in relation to differences in texture during sweetpotato storage root growth

Wei Dong

Ling Li

Ruxia Cao

Shu Xu

Lingling Cheng

Guoquan Lu

1 October 2018 in Journal of Food Protection

Journal Article

Effect of Carnauba Wax–Based Coating Containing Glycerol Monolaurate on Decay and Quality of Sweet Potato Roots during Storage

Huqing Yang

Xia Li

Guoquan Lu

Because of high water loss and rot observed in postharvest sweet potato (Ipomoea batatas (L.) Lam.) roots, a carnauba wax (CW)–based nanoemulsion without or with glycerol monolaurate (CW-GML) was developed by a high-energy emulsification approach. The effects of the two coatings on decay, respiration rate, weight loss, surface color, total soluble sugar, and starch content as well as the sensory quality of sweet potato roots were investigated during storage at 20°C for 50 days. Compared with the control treatment (water) and CW coating alone, CW-GML coating exhibited higher emulsion stability and antifungal activity, and treatment resulted in a uniform and continuous coating on roots. The CW-GML and CW coatings both effectively reduced root weight loss and respiration rate and inhibited decay incidence compared with control roots during storage. The CW-GML coating showed markedly stronger inhibition of root rot than the CW coating. Both the CW-GML and CW coatings promoted an increase in root swee...

30 September 2021 in Frontiers in Plant Science

Journal Article

A New Curve of Critical Leaf Potassium Concentration Based on the Maximum Root Dry Matter for Diagnosing Potassium Nutritional Status of Sweet Potato

Zunfu Lv

Guoquan Lu

Critical leaf nutrient concentrations have often been used to diagnose the nutritional status of crops. Determining critical leaf potassium (K) concentrations for the maximum root dry matter (RDM) will provide a reliable means of linking leaf K nutrient concentrations to the yield of sweet potato. Three field experiments, using varying K application rates (0–300 kg K ha⁻¹) and two sweet potato cultivars, were performed in the Zhejiang Province of China. A new critical leaf K curve (K_leaf) based on the maximum RDM was determined to assess K nutrition in sweet potato and described by the equation

K_{leaf} = 4.55 \times RD M_{max}^{- 0.075}

. A critical root K curve (K_root) based on the maximum RDM was also determined to assess K nutrition and described by the equation

K_{root} = 2.36 \times RD M_{max}^{- 0.087}

. The K nutrition index (KNI) was constructed to identify the situations of K-limiting and non-K-limiting treatments. The leaf KNI (KNI_leaf) ranged from 0.56 to 1.17, and the root K KNI (KNI_root) ranged from 0.52 to 1.35 during the growth period of sweet potato. The results showed that the critical leaf K concentration curve can be used as an accurate leaf K status diagnostic tool at critical growth stages that connected leaf nutrient concentration and sweet potato tuber yield. This K curve will contribute to K management of sweet potato during its growth period in China.

About Me

Guoquan Lu is currently the Director of the Potato Research Institute of Zhejiang Agriculture and Forestry University, Ph.D. supervisor of two Ph.D. programs at Jiangsu Normal University and Zhejiang Agriculture and Forestry University, and Executive Director of the Sweet Potato Professional Committee of the Chinese Crop Society, Vice President of the Sweet Potato Branch of the China Starch Industry Association, and Executive Director of the Potato Branch of the Chinese Cereals and Oils Society. He is a member of the Editorial Board of the Chinese Journal of Cereals and Oils, and a reviewer for several SCI journals. He is mainly engaged in the quality evaluation, storage, and preservation of sweet potatoes and comprehensive development research of the whole industrial chain of sweet potato industrialization. He is now a scientist at the National Sweet Potato Storage and Preservation Industry Technology System. He has presided over or participated in more than 100 projects, including four performed with national funds. He has published more than 350 papers, including more than 30 SCI papers. He has been granted nearly 30 patents. He has edited or co-edited 18 books, including Storage and Comprehensive Utilisation of Agricultural Products, Food Refrigeration and Preservation Technology, and Research on Genotypes and Environmental Influence of Sweet Potato Quality Traits.

Prof. Dr. Guoquan Lu

Prof. Dr. Guoquan Lu

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Representative Publications

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