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Gene Expression and Activities of SOD in cucumber seedlings Were Related with Concentrations of Mn^(2+),Cu^(2+),or Zn^(2+) Under Low Temperature Stress

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Agricultural Sciences in China 2009年第6期8卷 678-684页

作者： GAO Jun-jie LI Tao YU Xian-chang The lnsititute of Vegetables and Flowers Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China College of Horticulture Science and Engineering State Key Laboratory of Crop Biology Shandong Agricultural University Tai＇an 271018 P.R. China Municipal Bureau of Agriculture Tai＇an 271000P.R.China Yantai Academy of Agricultural Sciences Yantai 265500 P.R.China

Effects of increasing Mn^2＋, Cu^2＋, or Zn^2＋ on SOD expressions were studied in cucumber seedlings under low temperature stress. Both gene expressions and activities of Cu/Zn-SOD and Mn-SOD in cucumber seedling leaves were induced by increasing Mn^2＋, Cu^2＋, or Zn^2＋ under low temperature stress, especially 48 h afterwards. The activities of Cu/Zn-SOD and Mn-SOD at 0 and 48 h after treatment were in accordance with their gene expression levels, which implied that the transcriptional regulation plays key roles in regulating their activities at the early stage of low temperature stress. Gene expressions of Cu/Zn-SOD and Mn-SOD declined at 96 h, but Cu/Zn-SOD and Mn-SOD activities still remain high, which suggested that Cu/Zn-SOD and Mn-SOD activities might be regulated by other factors after transcription at the later stage of low temperature stress. Therefore, we concluded that the increasing Mn^2＋, Cu^2＋, or Zn^2＋ could increase the capacity of scavenging ROS in cucumber seedlings under low temperature stress by inducing gene expressions of Cu/ Zn-SOD and Mn-SOD, elevating activities of Cu/Zn-SOD, Mn-SOD, or regulating other factors after transcription.

关键词： real-time quantitative PCR cucumber seedlings SOD low temperature stress manganese copper zinc

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Interactive Effects of Drought Stresses and Elevated CO_2 Concentration on Photochemistry Efficiency of cucumber seedlings

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Journal of Integrative Plant Biology 2008年第10期50卷 1307-1317页

作者： Qing-Ming Li Bin-Bin Liu Yang Wu Zhi-Rong Zou College of Horticulture Northwest A&F University Yangling 712100 China State Key Laboratory of Soil Erosion and Dryland Farming of the Loess Plateau Institute of Soil and Water Conservation the Chinese Academy of Sciences Yangling 712100 China College of Horticultural Science and Engineering Shandong Agricultural University Tai'an 271018 China

To reveal and quantify the interactive effects of drought stresses and elevated CO2 concentration [CO2] on photochemistry efficiency of cucumber seedlings, the portable chlorophyll meter was used to measure the chlorophyll content, and the Imaging-PAM was used to image the chlorophyll fluorescence parameters and rapid light response curves （RLC） of leaves in two adjacent greenhouses. The results showed that chlorophyll content of leaves was reduced significantly with drought stress aggravated. Minimal fluorescence （Fo） was increased while maximal quantum yield of PSII （Fv/Fm） decreased significantly by severe drought stress. The significant decrease of effective quantum yield of PSII （Y（Ⅱ）） accompanied by the significant increase of quantum yield of regulated energy dissipation （Y（NPQ）） was observed under severe drought stress condition, but there was no change of quantum yield of nonregulated energy dissipation （Y（NO））. We detected that the coefficient of photochemical quenching （qP） decreased, and non-photochemical quenching （NPQ） increased significantly under severe drought stress. Furthermore, we found that maximum apparent electron transport rate （ETRmax） and saturating photosynthetically active radiation （PPFDsat） decreased significantly with drought stress aggravated. However, elevated [CO2] significantly increased FvlFm, qP and PPFDsat, and decreased NPQ under all water conditions, although there were no significant effects on chlorophyll content, Fo, Y（Ⅱ）, Y（NPQ）, Y（NO） and ETRmax. Therefore, it is concluded that CO2-fertilized greenhouses or elevated atmospheric [CO2] in the future could be favorable for cucumber growth and development, and beneficial to alleviate the negative effects of drought stresses to a certain extent.

关键词： chlorophyll fluorescence cucumber seedlings drought stresses elevated CO2 concentration photochemistry efficiency.

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Effects of light quality on growth and development of cucumber seedlings in controlled environment

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 312-318页

作者： Song Jinxiu Meng Qingwu Du Weifen He Dongxian Key Laboratory of Agricultural Engineering in Structure and Environment of Ministry of Agriculture China Agricultural UniversityBeijing 100083China

Conventional light sources have been successfully used to cultivate a wide variety of horticultural ***,they are of limited use due to uncontrollability of spectra and energy ***-emitting diodes(LEDs)emerged with tremendous potential in controlled environment agriculture due to their energy efficiency,longevity,and spectral specificity,but the effects of different types of LEDs on plant growth and development must be *** this study,cucumber(Cucumis sativus *** 26)seedlings were grown under four different lighting treatments that each delivered a photosynthetic photon flux density of 200μmol/m2·s at plant canopy including triphosphate fluorescent lamps(TF),high-frequency fluorescent lamps(HF),white LEDs(WL),and red and blue LEDs(RBL).cucumber seedlings were grown in a growth chamber at(25.0±1.5)℃with 12-hour light and 12-hour dark for 30 days after sowing,and data were subsequently *** grown under the WL were 45%,12%,and 40%taller than those grown under the TF,HF and RBL,*** leaf area was 23%smaller under the TF than under the *** shoot dry weight was 16%-22%lower under the TF than under the other lighting *** transplants grown under the RBL had the lowest root dry weight and root to shoot *** seedling quality index was similar among all the lighting *** LEDs treatment yielded more total dry weight with unit electric power compared to the fluorescent *** chlorophyll content was 13%-15%higher in plants grown under the HF and WL than that under the TF and *** grown under the WL and RBL had greater photosynthetic rate,transpiration rate,and stomatal conductance than those grown under the TF and *** was concluded that high quality cucumber seedlings can be efficiently produced under the broad-spectrum WL that emit a reasonable amount of blue,green and red light,and the lack of green light and/or high ratio of red to blue light under the RBL may cause und

关键词： blue light chlorophyll cucumber seedlings controlled environment gas exchange green light light-emitting diode red light

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Effects of phosphate solubilization and phytohormone production of Trichoderma asperellum Q1 on promoting cucumber growth under salt stress

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Journal of Integrative Agriculture 2015年第8期14卷 1588-1597页

作者： ZHAO Lei ZHANG Ya-qing College of Life Science Shandong Normal University

Salinity is one of the major abiotic stresses limiting crop growth and *** study investigated the underlying mechanisms of Trichoderma asperellum Q1 in promoting cucumber growth under salt stress, including the abilities of the strain to solubilize phosphate and to produce *** results showed that *** Q1 could solubilize inorganic or organic phosphate and the activities of phosphatases and phytase could be detected in the culture *** hydroponic experiments, the growth of cucumber seedlings was increased in the hydroponic system treated by culture filtrate of strain Q1 with tricalcium phosphate or calcium phytate under salt *** strain also exhibited the ability to produce indole acetic acid（IAA）, gibberellic acid（GA） and abscisic acid（ABA） in liquid medium without any *** levels of those three phytohormones in cucumber seedling leaves also increased after inoculated with this strain, along with increased root growth and root activities of the *** results demonstrated the mechanisms of *** Q1 in alleviating the suppression effect of salt stress involving the change of phytohormone levels in cucumber plant and its ability of phosphate solubilization.

关键词： Trichoderma asperellum Q1 cucumber seedlings phosphate solubilization phytohormone salt stress

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