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  • 1.
    Ni, Junbei
    et al.
    Department of Horticulture, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China; The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, The Ministry of Agriculture of China, Hangzhou, Zhejiang, People's Republic of China; Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, Zhejiang, People's Republic of China.
    Bai, Songling
    Department of Horticulture, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China; The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, The Ministry of Agriculture of China, Hangzhou, Zhejiang, People's Republic of China; Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, Zhejiang, People's Republic of China.
    Zhao, Yuan
    Department of Horticulture, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China; The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, The Ministry of Agriculture of China, Hangzhou, Zhejiang, People's Republic of China; Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, Zhejiang, People's Republic of China.
    Qian, Minjie
    Örebro University, School of Science and Technology.
    Tao, Ruiyan
    Department of Horticulture, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China; The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, The Ministry of Agriculture of China, Hangzhou, Zhejiang, People's Republic of China; Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, Zhejiang, People's Republic of China.
    Yin, Lei
    Department of Horticulture, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China; The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, The Ministry of Agriculture of China, Hangzhou, Zhejiang, People's Republic of China; Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, Zhejiang, People's Republic of China.
    Gao, Ling
    ACON Biotech (Hangzhou) Co., Ltd., Hangzhou, Zhejiang, People's Republic of China.
    Teng, Yuanwen
    Department of Horticulture, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China; The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, The Ministry of Agriculture of China, Hangzhou, Zhejiang, People's Republic of China; Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, Zhejiang, People's Republic of China.
    Ethylene response factors Pp4ERF24 and Pp12ERF96 regulate blue light-induced anthocyanin biosynthesis in 'Red Zaosu' pear fruits by interacting with MYB1142019In: Plant Molecular Biology, ISSN 0167-4412, E-ISSN 1573-5028, Vol. 99, no 1-2, p. 67-78Article in journal (Refereed)
    Abstract [en]

    KEY MESSAGE: Pp4ERF24 and Pp12ERF96 fine tune blue light-induced anthocyanin biosynthesis via interacting with PpMYB114 and promoting the interaction between PpMYB114 and PpbHLH3, which enhances the expression of PpMYB114-induced PpUFGT.

    The red coloration of pear fruit is attributed to anthocyanin accumulation, which is transcriptionally regulated by the MYB-bHLH-WD40 complex. A number of ethylene response factors (ERF) have been identified to regulate anthocyanin biosynthesis in different plants. In pear, several ERF transcription factor genes were identified to be potentially involved in the light-induced anthocyanin biosynthesis according to transcriptome data. But the molecular mechanism of these ERFs underlying the regulation of anthocyanin accumulation is unknown. In this study, exposure of 'Red Zaosu' pear, a mutant of 'Zaosu' pear, to blue light significantly induced the anthocyanin accumulation by increasing the expression levels of anthocyanin biosynthetic genes. Gene expression analysis confirmed that the expression of Pp4ERF24 and Pp12ERF96 genes were up-regulated in the process of blue light-induced anthocyanin biosynthesis. Yeast two-hybrid and bimolecular fluorescence complementation assay revealed that Pp4ERF24 and Pp12ERF96 interacted with PpMYB114, but not with PpMYB10. Bimolecular fluorescence complementation assay demonstrated that the interaction between these two ERFs and PpMYB114 enhanced the interaction between PpMYB114 and PpbHLH3. Further analysis by dual luciferase assay verified that these two ERFs increased the up-regulation of PpMYB114-mediated PpUFGT expression. Furthermore, co-transformation of Pp12ERF96 with PpMYB114 and PpbHLH3 in tobacco leaves led to enhanced anthocyanin accumulation. Transient overexpression of Pp4ERF24 or Pp12ERF96 alone in 'Red Zaosu' pear fruit also induced anthocyanin biosynthesis in pear peel. Our findings provide insights into a mechanism involving the synergistic interaction of ERFs with PpMYB114 to regulate light-dependent coloration and anthocyanin biosynthesis in pear fruits.

  • 2.
    Qian, Minjie
    et al.
    Örebro University, School of Science and Technology. Department of Horticulture, The State Agricultural Ministry Key Laboratory of Horticultural Plant Growth, Development & Quality Improvement, Zhejiang University, Hangzhou, Zhejiang Province, China.
    Kalbina, Irina
    Örebro University, School of Science and Technology.
    Rosenqvist, Eva
    Section of Crop Sciences, Department of Plant and Environmental Sciences, Copenhagen University, University of Copenhagen, Copenhagen, Denmark.
    Jansen, Marcel A. K.
    School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland.
    Teng, Yuanwen
    Department of Horticulture, The State Agricultural Ministry Key Laboratory of Horticultural Plant Growth, Development & Quality Improvement, Zhejiang University, Hangzhou, Zhejiang Province, China.
    Strid, Åke
    Örebro University, School of Science and Technology.
    UV regulates expression of phenylpropanoid biosynthesis genes in cucumber (Cucumis sativus L.) in an organ and spectrum dependent manner2019In: Photochemical and Photobiological Sciences, ISSN 1474-905X, E-ISSN 1474-9092, Vol. 18, no 2, p. 424-433Article in journal (Refereed)
    Abstract [en]

    Expression of cucumber (Cucumis sativus) genes encoding the phenylpropanoid and flavonoid biosynthetic enzymes phenylalanine ammonia lyase (PAL), cinnamic acid 4-hydroxylase (C4H), and chalcone synthase (CHS), was studied under control light conditions (photosynthetically active radiation, PAR) in root, stem, and leaf. Furthermore, expression was quantified in leaves illuminated with PAR and supplemental ultraviolet-A (315-400nm) or ultraviolet-B (280-315 nm) radiation. The expression pattern of all twelve CsPAL, threeCsC4H, and three CsCHS genes was established. Among the genes regulated by UV two general expression patterns emerge. One pattern applies to genes primarily regulated by enriched UV-A illumination (pattern 1). Another (pattern 2) was found for the genes regulated by enriched UV-B. Three of the pattern 2 genes (CsPAL4, CsPAL10, CsCHS2) displayed a particular sub-pattern (pattern 2b) with transcription enriched by at least 30 fold. In contrast to the other genes studied, the promoters of the genes regulated according to pattern 2b contained a combination of a number of cis-acting regulatory elements (MREs, ACEs, and G-boxes) that may be of importance for the particularly high enhancement of expression under UV-B- containing light. The regulation of phenylpropanoid and flavonoid biosynthesis genes in cucumber resembles that of a number of other plants. However, cucumber, due to its greater size, is an attractive species for more detailed studies of the fine regulation of spatial and temporal expression of key genes. This in turn, can facilitate the quantitative investigation of the relationships between different promotor motifs, the expression levels of each of these three genes, and metabolite accumulation profiles.

  • 3.
    Rodriguez-Calzada, Tania
    et al.
    Biosystems Engineering Group, School of Engineering, Autonomous University of Queretaro-Campus Amazcala, Querétaro, Mexico.
    Qian, Minjie
    Örebro University, School of Science and Technology.
    Strid, Åke
    Örebro University, School of Science and Technology.
    Neugart, Susanne
    Department of Quality, Leibniz Institute for Ornamental and Horticultural Crops, Großbeeren, Germany.
    Schreiner, Monika
    Department of Quality, Leibniz Institute for Ornamental and Horticultural Crops, Großbeeren, Germany.
    Torres-Pacheco, Ireno
    Biosystems Engineering Group, School of Engineering, Autonomous University of Queretaro-Campus Amazcala, Querétaro, Mexico.
    Guevara-Gonzales, Ramon
    Biosystems Engineering Group, School of Engineering, Autonomous University of Queretaro-Campus Amazcala, Querétaro, Mexico.
    Effect of UV-B radiation on morphology, phenolic compound production, gene expression, and subsequent drought stress responses in chili pepper (Capsicum annuum L.)2019In: Plant physiology and biochemistry (Paris), ISSN 0981-9428, E-ISSN 1873-2690, Vol. 134, p. 94-102Article in journal (Refereed)
    Abstract [en]

    It has been suggested that accumulation of flavonoids could be a key step in development of plant tolerance to different environmental stresses. Moreover, it has been recognized that abiotic stresses such as drought and UV-B radiation (280-315 nm) induce phenolic compound accumulation, suggesting a role for these compounds in drought tolerance. The aim of the present study was to evaluate the effect of UV-B exposure on chili pepper (Capsicum annuum, cv. ‘Coronel’) plant performance, phenolic compound production, and gene expression associated with response to subsequent drought stress. Additionally, the phenotypic response to drought stress of these plants was studied. UV-B induced a reduction both in stem length, stem dry weight and number of floral primordia. The largest reduction in these variables was observed when combining UV-B and drought. UV-B-treated well-watered plants displayed fructification approximately 1 week earlier than non-UV-B-treated controls. Flavonoids measured epidermally in leaves significantly increased during UV-B treatment. Specifically, UV-B radiation significantly increased chlorogenic acid and apigenin 8-C-hexoside levels in leaves and a synergistic increase of luteolin 6-C-pentoside-8-C-hexoside was obtained by UV-B and subsequent drought stress. Gene expression of phenylalanine ammonia lyase (PAL) and chalcone synthase (CHS) genes also increased during UV-B treatments. On the other hand, expression of genes related to an oxidative response, such as mitochondrial Mn-superoxide dismutase (Mn-SOD) and peroxidase (POD) was not induced by UV-B. Drought stress in UV-B-treated plants induced mitochondrial Mn-SOD gene expression. Taken together, the UV-B treatment did not induce significant tolerance in plants towards drought stress under the conditions used.

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