State Key Laboratory of Crop Biology

Taian, China

State Key Laboratory of Crop Biology

Taian, China
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PubMed | University of Turku and State Key Laboratory of Crop Biology
Type: | Journal: Scientific reports | Year: 2016

Ultraviolet-B radiation (UV-B) is generally considered to negatively impact the photosynthetic apparatus and plant growth. UV-B damages PSII but does not directly influence PSI. However, PSI and PSII successively drive photosynthetic electron transfer, therefore, the interaction between these systems is unavoidable. So we speculated that UV-B could indirectly affect PSI under chilling-light conditions. To test this hypothesis, the cucumber leaves were illuminated by UV-B prior or during the chilling-light treatment, and the leaves were then transferred to 25C and low-light conditions for recovery. The results showed that UV-B decreased the electron transfer to PSI by inactivating the oxygen-evolving complex (OEC), thereby protecting PSI from chilling-light-induced photoinhibition. This effect advantages the recoveries of PSI and CO

Fang X.,Shandong Agricultural University | Fang X.,State Key Laboratory of Crop Biology | Wang J.,Shandong Agricultural University | Wang J.,State Key Laboratory of Crop Biology | And 3 more authors.
Journal of Separation Science | Year: 2010

An optimized microwave-assisted extraction (MAE) method and an efficient HPLC analysis method were developed for fast extraction and simultaneous determination of oleanolic acid and ursolic acid in the fruit of Chaenomeles sinensis. The open vessel MAE process was optimized by using a central composite experimental design. The optimal conditions identified were microwave power 600 W, temperature 52°C, solvent to material ratio 32 mL/g and extraction time 7 min. The results showed that MAE is a more rapid extraction method with higher yield and lower solvent consumption. The HPLC-photodiode array detection analysis method was validated to have good linearity, precision, reproduction and accuracy. Compared with conventional extraction and analysis methods, MAE-HPLC-photodiode array detection is a faster, convenient and appropriate method for determination of oleanolic acid and ursolic acid in the fruits of C. sinensis. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA.

Liu L.,Dezhou University | Liu L.,State Key Laboratory of Crop Biology
Journal of Pure and Applied Microbiology | Year: 2013

ZmPP2C (AY621066) is a protein phosphatase 2C mRNA that we cloned from maize previously. TMpred program analysis indicated this protein contains a significant transmembrane helix of about 20 amino acid residues; however SVMtm predicted it is not a transmembrane protein. STRIDE, Modeller and RasMol program analysis suggested the ZmPP2C protein is a globular protein containing seven alpha helixes, fourteen beta sheets, twenty-two turns and one 310 helix. The coding region of ZmPP2C mRNA was subcloned into expression vectors, pET30a-c(+), and introduced into E. coli BL21 (DE3) for expression. SDS-PAGE analysis indicated ZmPP2C was highly expressed at 37°C for 4 h with induction by 1 mM IPTG. Ultrasonic extraction experiment showed this recombinant protein was soluble in lysis buffer solution. The hexahistidine-tagged ZmPP2C fusion protein were purified and used to immunize rat for producing antibody. Protein gel blot analysis stated clearly that a specific polyclonal antibody against the protein was produced and can be used for further study about the ZmPP2C gene. Subcellular localization suggested that ZmPP2C protein was located in cell nucleus.

Zhang Z.,State Key Laboratory of Crop Biology | Zhang Z.,Shandong Agricultural University | Li G.,State Key Laboratory of Crop Biology | Li G.,Shandong Agricultural University | And 10 more authors.
PLoS ONE | Year: 2012

The net photosynthetic rate, chlorophyll content, chlorophyll fluorescence and 820 nm transmission were investigated to explore the behavior of the photosynthetic apparatus, including light absorption, energy transformation and the photoactivities of photosystem II (PSII) and photosystem I (PSI) during senescence in the stay-green inbred line of maize (Zea mays) Q319 and the quick-leaf-senescence inbred line of maize HZ4. The relationship between the photosynthetic performance and the decrease in chlorophyll content in the two inbred lines was also studied. Both the field and laboratory data indicated that the chlorophyll content, net photosynthetic rate, and the photoactivities of PSII and PSI decreased later and slower in Q319 than in HZ4, indicating that Q319 is a functional stay-green inbred line. In order to avoid the influence of different development stages and environmental factors on senescence, age-matched detached leaf segments from the two inbred lines were treated with ethephon under controlled conditions to induce senescence. The net photosynthetic rate, light absorption, energy transformation, the activities of PSII acceptor side and donor side and the PSI activities decreased much slower in Q319 than in HZ4 during the ethephon-induced senescence. These results suggest that the retention of light absorption, energy transformation and activity of electron transfer contribute to the extended duration of active photosynthesis in Q319. Although the chlorophyll content decreased faster in HZ4, with decrease of chlorophyll content induced by ethephon, photosynthetic performance of Q319 deteriorated much more severely than that of HZ4, indicating that, compared with Q319, HZ4 has an advantage at maintaining higher photosynthetic activity with decrease of chlorophyll although HZ4 is a quick-leaf-senescence inbred line. We conclude that attention should be paid to two favorable characteristics in breeding long duration of active photosynthesis hybrids: 1) maintaining more chlorophyll content during senescence and 2) maintaining higher photosynthetic activity during the loss of chlorophyll. © 2012 Zhang et al.

Zhan K.,Shandong Agricultural University | Zhan K.,State Key Laboratory of Crop Biology | Xu K.,State Key Laboratory of Crop Biology | Xu K.,Shandong Agricultural University | Yin H.,Shandong Agricultural University
Food Chemistry | Year: 2011

A novel method for purifying gingerols from ginger was developed using a high-speed counter-current chromatography (HSCCC). The two-phase solvent system such as light petroleum (bp 60-90 °C)-ethyl acetate-methanol-water (5:5:6.5:3.5, v/v/v/v) was applied to the separation and purification of 6-, 8- and 10-gingerol from a crude extract of ginger. The experiment yielded 30.2 mg of 6-gingerol, 40.5 mg of 8-gingerol, 50.5 mg of 10-gingerol from 200 mg of crude extract in one-step separation. And the purity of these compounds was 99.9%, 99.9% and 99.2%, respectively, as determined by high-performance liquid chromatography (HPLC). Their structures were identified by gas chromatography-mass spectrometry (GC/MS) and 1H, 13C nuclear magnetic resonance (NMR). © 2010 Elsevier Ltd. All rights reserved.

Luo Y.,East China Normal University | Gao Y.M.,East China Normal University | Wang W.,Shandong Agricultural University | Wang W.,State Key Laboratory of Crop Biology | Zou C.J.,East China Normal University
Biologia Plantarum | Year: 2014

Trehalose was supplied to wheat (Triticum aestivum L.) seedlings just before a high temperature (40 °C) treatment and some physiological parameters were measured during the heat stress and recovery. The application of trehalose decreased the net photosynthetic rate (PN) of wheat seedlings under the heat stress, but to a small extent increased the dry mass (DM) and leaf water content (LWC) after recovery from the heat stress. The trehalose-induced decrease in PN under the heat stress was not associated with a stomatal response. The heat stress slightly decreased the maximal efficiency of photosystem II (PS II) photochemistry (the variable to maximum chlorophyll a fluorescence ratio, Fv/Fm) similarly in the trehalose treated or non-treated plants. Under the heat stress, the actual efficiency of PS II photochemistry (ΦPSII) and the efficiency of excitation energy capture by open reaction centers (Fv′/Fm′) were lower in the trehalose-pretreated seedlings, whereas they were higher after the recovery. The patterns of changes in nonphotochemical quenching (NPQ) were contrary to those of φ{symbol}PS II and Fv′/Fm′. The chlorophyll content was lower, whereas the β-carotene content and the degree of de-epoxidation (DEPS) of xanthophyll cycle pigments were higher in the trehalose-pretreated wheat seedlings under the heat stress. These results suggest that exogenous trehalose partially promotes recovery of wheat by the increase of NPQ, β-carotene content, and DEPS. © 2014 Springer Science+Business Media Dordrecht.

An H.,Shandong Agricultural University | Yang K.,Shandong Agricultural University | Yang K.,State Key Laboratory of Crop Biology
Euphytica | Year: 2014

Walnut (Juglans regia L.) resistance gene analogs (RGAs) of 35 nucleotide binding site RGAs (jrRGAPGs), 47 leucine-rich repeat RGAs (jrRGANLs), and 45 serine/threonine kinase RGAs (jrRGAPTs) conferring resistance to the pathogen Colletotrichum gloeosporioides (Penz.) Penz. and Sacc. were isolated from the resistant cultivar 'Qing Lin', the susceptible cultivar 'Yuan Lin', and their F1 hybrids using a polymerase chain reaction-based strategy. The jrRGAPGs and jrRGAPTs occurred only in 'Qing Lin', whereas the jrRGANLs were found in both parent cultivars. In 85 F1 hybrid progeny, the jrRGAPGs were found only in resistant individuals, while the jrRGANLs and jrRGAPTs were present more frequently in resistant individuals than in susceptible ones. The jrRGAPGs were highly homologous to nucleotide binding site genes from other species. Multiple alignments revealed that jrRGAPGs had P-loop, kinase-2, kinase-3, and hydrophobic GLPL motifs. Phylogenetic analysis resolved the inferred jrRGAPG amino acid sequences into distinct TIR and non-TIR clades. The jrRGANLs had no matches in GenBank and were classified into multiple subfamilies in the phylogeny. The jrRGAPTs were similar to known kinase receptor/regulators and formed two major phylogenetic clades. These results will facilitate molecular breeding strategies for walnut anthracnose resistance. © 2013 Springer Science+Business Media Dordrecht.

Xue Z.,State Key Laboratory of Crop Biology | Xue Z.,Shandong Agricultural University | Gao H.,State Key Laboratory of Crop Biology | Gao H.,Shandong Agricultural University | And 2 more authors.
Environmental Science and Pollution Research | Year: 2014

Cadmium (Cd) is a widely spread pollutant and can be easily taken up by crop from soil, resulting in a serious health issue for humans. The objective of this study was to comparatively investigate the photosynthetic activity, chlorophyll a fluorescence, chlorophyll contents, and spectral reflectance in mature and young leaves of soybean plants after being treated with different concentrations of Cd for 10 days. The photosynthetic rate, chlorophyll contents, actual photochemical efficiency of PSII, and photochemical quenching in the young leaves decreased more significantly with increasing concentrations of Cd in the nutrient solution, compared with those in the mature leaves, though the young leaves had less Cd concentrations. Thus, there was more excessive excited energy produced in the young leaves than that in the mature leaves. In the young leaves, due to more excessive excited energy, more reactive oxygen species may be generated, which further damaged the photosynthetic apparatus. It was supported by the fact that the decrease of reflectance in near-infrared wavelengths of the young leaves was more noticeable than that of the mature leaves. In addition, the chlorophyll a fluorescence transients of the young leaves was significantly different from that in the mature leaves, indicating that the electron transport of young leaves were inhibited much more severely than that of the mature leaves. These observations imply that the responses of photosynthetic activity of soybean leaves to Cd stress depend on their growth stage, and the Cd-induced inhibition of photosynthetic activity might be attributed to the decrease in chlorophyll contents and the decrease in mesophyll CO2 assimilation ability cause by the Cd, which further decreased the consumption of ATP and NADPH, leading to accumulation of NADPH on the acceptor sides of the PSI, and then feedback inhibited electron transport in chloroplasts. © 2013 Springer-Verlag Berlin Heidelberg.

Feng J.,Shandong Agricultural University | Shi Q.,Shandong Agricultural University | Shi Q.,State Key Laboratory of Crop Biology | Wang X.,Shandong Agricultural University | And 6 more authors.
Scientia Horticulturae | Year: 2010

The effects of silicon (Si) application on plant growth, pigments, photosynthetic parameters, chlorophyll a (Chl a) fluorescence parameters and nitrogen metabolism were studied in Cucumis sativus L. under cadmium (Cd) toxicity. Compared with the control, 100 μM CdCl2 treatment caused dramatic accumulation of Cd in cucumber leaves, greatly induced chlorosis, and the transmission electron microscope (TEM) analysis indicated that Cd treatment cucumber chloroplast showed obvious swollen, thylakoids and chloroplast membrane were seriously damaged, and could not be observed clearly. Application of Si reversed the chlorosis, protected the chloroplast from disorganization, and significantly increased the pigments contents, which might be mainly responsible for the higher photosynthetic rate and accumulation of biomass under Cd stress. Further investigation of chlorophyll a fluorescence indicated that Cd treatment decreasing photosynthesis was not due to stomatal restriction, while was closely related integrity damage or function lost of the photosynthetic machinery which can be concluded from the higher intercellular CO2 concentration (Ci) and lower Fv/Fm and ΦPSII. Application of Si alleviated the inhibited level of photosynthesis and Fv/Fm and ΦPSII by Cd, which might imply that Si plays important roles in protecting photosynthetic machinery from damaging. The Cd treatment also greatly inhibited the enzymes of nitrogen metabolism including nitrogen reductase (NR), glutamine synthetase (GS), glutamate synthase (GOGAT) and glutamate dehydrogenase (GDH), and Si supply decreased the inhibiting effects of Cd. Crown Copyright © 2009.

PubMed | State Key Laboratory of Crop Biology
Type: | Journal: Scientific reports | Year: 2015

Although root-to-shoot communication has been intensively investigated in plants under drought, few studies have examined root-to-shoot communication under chilling. Here we explored whether root-to-shoot communication contributes to the chilling-light tolerance of cucumber shoots and clarified the key signal involves in this communication. After leaf discs chilling-light treatment, the photoinhibitions of Photosystem I (PSI) and Photosystem II (PSII) were similar in leaf discs of two cucumber varieties (JY-3 and JC-4). When the whole plants, including roots, were chilled under light, the photosynthetic performances in JC-4 leaves decreased more seriously than that in JY-3 leaves. However, when the water status of leaves was maintained by warming roots or floating the attached leaves on water, the PSII activity and amount of PSI in the leaves of the two varieties were similar after chilling-light treatment. In addition, the differences of PSII activities and amount of PSI between the two varieties under whole plant chilling-light treatment were independent of ABA pretreatment. Above results indicate that (1) the better water status in leaves under chilling contributes to the higher chilling tolerance of JY-3; (2) the water status, rather than an ABA signal, dominates root-to-shoot communication under chilling and the chilling tolerance of cucumber shoot.

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