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Changes in the photosynthetic pigment Contents and Transcription Levels of Phycoerythrin-Related Genes in Three Gracilariopsis lemaneiformis Strains Under Different Light Intensities

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Journal of Ocean University of China 2021年第3期20卷 661-668页

作者： CAO Xuexue WANG Haitao ZANG Xiaonan LIU Zhu XU Di JIN Yuming ZHANG Feng WANG Zhendong Key Laboratory of Marine Genetics and Breeding(Ocean University of China) Ministry of EducationQingdao 266003China

Three Gracilariopsis lemaneiformis strains,including wild type and high-temperature-resistant cultivars 981 and 2007,were studied with the changes in their photosynthetic pigment contents and related gene transcription levels under different light intensities(10,60,100,and 200μmolm^(−2)s^(−1)).The three *** strains had the following photosynthetic pigments with high-to-low contents:phycoerythrin(PE),phycocyanin(PC),allophycocyanin(APC),and chlorophyll a(Chl a).Among the three strains,cultivar 981 had the highest PE content,followed by cultivar *** PC and APC contents were similar among the three strains,but they were higher in cultivars 981 and 2007 than in the wild *** Chl a contents in the three *** strains were equal.A low light intensity(10μmolm^(−2)s^(−1))promoted photosynthetic pigment accumulation in *** and improved the relative PE gene transcription(peA and peB)in a short period(≤6 d).A high light intensity decreased the PE *** and PebB,which catalyzed phycoerythrobilin synthesis,showed no compensatory upregulation at a low light intensity among the strains except for the wild *** a high light intensity,transcription levels of pebA and pebB in the three strains were *** study provided an experimental basis for elucidating the photosynthesis of *** key genes of algal growth,photo-synthesis-related genes served as useful gene markers for screening elite varieties with good traits in *** 2007 was superior to cultivar 981 in terms of maintaining high pigment levels in a wide range of light intensities,which is the most suitable for aquaculture.

关键词： Gracilariopsis lemaneiformis light intensity photosynthetic pigment PE gene transcription

Effects of drought stress on antioxidant enzyme,photosynthetic pigment and flavonoid pathway in two desert shrubs

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Research in Cold and Arid Regions 2011年第4期3卷 332-338页

作者： YuBing Liu MeiLing Liu Bo Cao Laboratory of Plant Stress Ecophysiology and Biotechnology Shapotou Desert Research and Experiment Station Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China

Antioxidant enzyme activity, photosynthetic pigment content, and free malondialdehyde （MDA）, as well as flavonoid content and the key enzyme activity in the flavonoid pathway were determined in two desert shrubs, Caryopteris mongolica Bunge and Reaumuria soongorica （Pall.） Maxim. under drought stress. The free MDA content was enhanced during the experimental period, which may be an indicator of oxidative stress. Superoxide dismutase （SOD）, peroxidase （POD）, and ascorbate peroxidase （APX） activities in C. mongholica showed a significant increase during the experiment, but catalase （CAT） activity was slightly decreased. On the other hand, POD and APX activities showed a significant increase and SOD and CAT activity data had no significant changes in R. soongorica. APX, SOD, and CAT activities were higher in R. soongorica than in C. mongholica, but MDA content was lower, indicating that the lower values of MDA were attributed to higher activities of antioxidant enzyme in R. soongorica. Chlorophyll content decreased significantly in the two shrubs during the experiment, which indicated that there was a photoprotection mechanism through reducing light absorbance by decreasing pigments content. Caretonoids content increased in C. mongholica and decreased in R. soongorica. The ratio of Chla/Chlb decreased significantly but caretonoids/Chl revealed a significant increase in the two shrubs, which could be explained as no decrease of peripheral light-harvesting complexes and a higher tolerance to drought. Total flavonoid content and the activities of phenylalanine ammonialyase （PAL） and chalcone isomerase （CHI） showed different changes between C. mongholica and R. soongorica after treatment. These values decreased in R. soongorica and increased in C. mongholica except for PAL activity. However, anthocyanin content increased in the two shrubs, indicating that there was a different regulation response in the ftavonoid pathway in the two shrubs under drought stress, and anthocya

关键词： antioxidant enzyme photosynthetic pigment flavonoid Caryopteris mongolica Bunge Reaumuria soongorica (Pall.) Maxim.

Effects of Different Light Qualities on the Growth Characteristics of Populus trinervis

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Phyton-International Journal of Experimental Botany 2024年第5期93卷 1043-1056页

作者： Jiaqi Li Zhensheng Qiao Dan Zong Chengzhong He Key Laboratory for Forest Genetics and Tree Improvement and Propagation in Universities of Yunnan Province Southwest Forestry UniversityKunmingChina Key Laboratory of Biodiversity Conservation in Southwest China State Forestry AdministrationSouthwest Forestry UniversityKunmingChina Key Laboratory for Forestry Resources Conservation and Utilization in the Southwest Mountains of China Ministry of EducationSouthwest Forestry UniversityKunmingChina

Populus trinervis is native to China and plays an irreplaceable role in maintaining the ecological balance of boreal and temperate *** mainly grows in high-altitude *** present,there are limited studies on the response of *** to different light qualities,so it is necessary to investigate the photosynthetic physiological changes of *** in different light *** our study,*** was grown for 8 months under light filtered by three different colored *** three treatments were blue film,green film,and white plastic *** effects of blue(B),green(G),and white(W)light on photosynthetic pigment content,absolute growth,photosynthetic parameters,soluble sugar content,and chlorophyll fluorescence parameters were studied,*** to the Wtreatment,the chlorophyll a and b,carotenoids,total chlorophyll content(a+b),absolute growth of seedling height,net photosynthetic rate(PN),water use efficiency(WUE),total soluble sugars,sucrose,and nonphotochemical quenching(NPQ)of *** were significantly increased under B ***,chlorophyll a and b,carotenoids,total chlorophyll(a+b),transpiration rate(Tr),intercellular CO_(2) concentration(Ci),stomatal conductance(gs),absolute growth of seedling height and leaf length,reducing sugar,total soluble sugar content,and NPQ were significantly increased under G *** results showed that the absolute growth and chlorophyll content of *** were increased under B light,while the sugar and photosynthetic parameters were increased under G *** studies may look into how B light impacts absolute growth and promotional mechanisms,as well as how G light affects the accumulation of sugar levels.

关键词： Blue light green light white light photosynthetic pigment soluble sugar

An in Vitro Approach to Investigate the Role of Abscisic Acid in Alleviating the Negative Effects of Chilling Stress on Banana Shoots

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Phyton-International Journal of Experimental Botany 2023年第6期92卷 1695-1711页

作者： Ibrahim Hmmam Ali Raza Ivica Djalovic Nagwa Khedr Abdou Abdellatif Pomology Department Faculty of AgricultureCairo UniversityGiza2613Egypt College of Agriculture Fujian Agriculture and Forestry UniversityFuzhou350002China Institute of Field and Vegetable Crops National Institute of the Republic of SerbiaNovi SadSerbia

Banana is a tropical crop cultivated in warm *** stress in Egypt is making banana crops less *** acid(ABA),a key plant hormone,regulates metabolic and physiological processes and protects plants from a variety of *** vitro growing banana shoots were pre-treated with ABA at four concentrations(0,25,50,and 100 mM)and chilled at 5℃for 24 h,followed by a six-day recovery period at 25℃.By comparing ABA treatments to both positive and negative controls,physiological and biochemical changes were *** stress(5℃)caused a considerable increase in lipid peroxidation and ion leakage and reduced photosynthetic pigments in cold-treated *** the concentration of ABA to 100μM enhanced the response to chilling *** had a major effect on mitigating chilling injury in banana shoots by keeping cell membranes stable and lowering the amount of ion leakage and lipid ***,ABA significantly maintained the photosynthetic pigment concentration of banana shoots;accumulated higher amounts of total soluble carbohydrates and proline;and increased DPPH radical scavenging ***,ABA treatment enhanced cold tolerance in chilling-stressed banana shoots through the regulation of antioxidant enzyme ***,the results show that ABA is a good choice for protecting banana shoots from the damage caused by chilling stress.

关键词： Abiotic stress antioxidant cold stress plant hormone photosynthetic pigment

Comparative Analysis of the photosynthetic Characteristics and Active Compounds of Semiliquidambar cathayensis Chang Heteromorphic Leaves

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Phyton-International Journal of Experimental Botany 2023年第3期92卷 837-850页

作者： Xiaoming Tian Guangfeng Xiang Hao Lv Jing Peng Lu Zhu Hunan Botanical Garden Changsha410116China

In the present study,the variation patterns of leaf shape in different populations of individual Semiliquidambar cathayensis plants were analyzed to investigate the relationship among leaf shape variation,photosynthetic properties,and active compounds to understand the genetic characteristics of *** and screen elite *** leaf shape of 18 offspring from three natural *** populations was analyzed to investigate the level of diversity and variation patterns of leaf ***,photosynthetic pigment content,physiological parameters of photosynthesis,and the active compounds in leaves of different shapes were *** analysis showed that the leaf shape variation in *** indicated a high level of genetic diversity among and within the *** analysis showed that the three natural populations formed two clusters,one whose offspring was dominated by entire leaves and another characterized by palmately trifoliate *** differences in photosynthetic characteristics and active compounds of leaves of three different shapes were comprehensively evaluated using principal component *** principal components with a cumulative contribution rate of 92.768%were extracted,of which the highest comprehensive score was for asymmetrically lobed *** leaf shape in different *** germplasms exhibited distinct patterns,and there were some correlations between the photosynthetic properties and active compounds in leaves of different ***,the leaf shape can be used to predict active compound content,and in turn,select varieties based on that purpose;it also provides a simple and effective method to classify *** germplasms.

关键词： Semiliquidambar cathayensis leaf shape photosynthetic pigment photosynthetic property active compound

Characterization and Genetic Analysis of a Light-and Temperature-sensitive Spotted-leaf Mutant in Rice

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Journal of Integrative Plant Biology 2011年第8期53卷 671-681页

作者： Qi-Na Huang Yong-Feng shi Yang Yang Bao-Hua Feng Yan-Lin Wei Jie Chen Marietta Baraoidan Jian-Li Wu State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006 China College of Life and Environmental Sciences Hangzhou Normal University Hangzhou 310036 China International Rice Research Institute DAPO Box 7777 Metro Manila Philippines

A rice spotted-leaf mutant was isolated from an ethane methyl sulfonate （EMS）-induced IR64 mutant bank. The mutant, designated as spl30 （spotted-leaf 30）, displayed normal green leaf color under shade but exhibited red-brown lesions under natural summer field conditions. Initiation of the lesions was induced by light and the symptom was enhanced at 33 ° C relative to 26°C. Histochemical staining did not show cell death around the red-brown lesions. Chlorophyll contents in the mutant were significantly lower than those of the wild type while the ratio of chlorophyll a/b remained the same, indicating that spl30 was impaired in biosynthesis or degradation of chlorophyll. Disease reaction patterns of the mutant to Xanthomonas oryzae pv. oryzae were largely unchanged to most races tested except for a few strains. Genetic analysis showed that the mutation was controlled by a single recessive gene, tentatively named spl30（t）, which co-segregated with RM15380 on chromosome 3, and was delimited to a 94 kb region between RM15380 and RM15383. Spl30（t） is likely a novel rice spotted-leaf gene since no other similar genes have been identified near the chromosomal region. The genetic data and recombination populations provided in this study will enable further fine-mapping and cloning of the gene.

关键词： rice disease resistance gene mapping photosynthetic pigment spotted-leaf.

Effect of Silver Nanoparticles on Growth of Eukaryotic Green Algae

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Nano-Micro Letters 2012年第3期4卷 158-165页

作者： Anjali Dash Anand P.Singh Bansh R.Chaudhary Sunil K.Singh Debabrata Dash Department of Biochemistry Institute of Medical SciencesBanaras Hindu University Centre of Advanced Study in Botany Banaras Hindu University

Silver nanoparticles,endowed with powerful antimicrobial property,are the most widely used nanomaterial in consumer products,with associated risk of their easy access to environment and freshwater ecosystems by surface *** toxic effects of nanosilver on bacterial,fungal and mammalian cells have been documented,its impact on algal growth remains *** oedogonia and Chara vulgaris are predominant members of photosynthetic eukaryotic algae,which form major component of global aquatic *** we report for the first time that nanosilver has significant adverse effects on growth and morphology of these filamentous green algae in a dose-dependent *** of algal thalli to increasing concentrations of silver nanoparticles resulted in progressive depletion in algal chlorophyll content,chromosome instability and mitotic disturbance,associated with morphological malformations in algal *** micrographs revealed dramatic alterations in cell wall in nanoparticle-treated algae,characterized with cell wall rupture and degradation in *** these observations underscore severe deleterious effects of nanosilver on aquatic environment,the information can also be exploited as a bioengineering strategy to control unwanted and persistent growth of noxious algal weeds that clog the municipal water supply and water channels and produce fouling of water bodies.

关键词： Silver nanoparticles Green algae Algal growth photosynthetic pigment Nanotoxicity

Contrasting altitudinal patterns of leaf UV reflectance and absorbance in four herbaceous species on the Qinghai-Tibetan Plateau

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Journal of Plant Ecology 2019年第2期12卷 245-254页

作者： Xin Li Xinran Ke Huakun Zhou Yanhong Tang Department of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityNo.5 Yiheyuan RoadHaidian DistrictBeijing 100871China Key Laboratory of Cold Regions Restoration Ecology Qinghai ProvinceNorthwest Plateau Institute of BiologyChinese Academy of SciencesNo.23 Xinning RoadXining 810008China

Aims Alpine plants have to cope with intense ultraviolet(UV)radiation and its altitudinal *** has been argued that leaf UV reflec-tance and absorbance should play a central role in acclimation and adaptation to changes in UV radiation,but evidence is lim-ited from high altitudinal *** this study,we assessed whether leaf UV reflectance and leaf pigments jointly vary with altitude in alpine broadleaved herbaceous *** primary hypothesis is that leaves with higher UV reflectance should have lower UV absorbance and/or lower contents of photosynthetic *** Leaf UV reflectance,leaf UV absorbance and photosynthetic pig-ments(chlorophyll a and b,carotenoids)were examined in four broadleaved herbaceous species in relation to their habitat *** leaf surface reflectance and leaf extract absorbance at wavelengths of 305 and 360 nm were measured to examine the leaf optical and photochemical characteristics in the UV-B and UV-A bands,*** species included Saussurea katochaete Maxim.,Saussurea pulchra Lipsch.,Anaphalis lactea *** Rheum pumilum Maxim.,which are distributed along the same slope from 3200 to 4200 m in the Qilian Mountains,Qinghai-Tibetan *** Findings The leaf UV absorbance was approximately twice as high at 305 nm(UV-B)than at 360 nm(UV-A)for all species except *** the four species,the leaf UV absorbance was the highest and almost all values were within 2-6 Abs cm^(−2)(absorbance cm^(−2))in ***,but the lowest(frequentlyphotosynthetic pigments tended to decrease with an increase in leaf UV refl

关键词： altitudinal pattern leaf UV reflectance UV absorbance photosynthetic pigment UV environment

Effects of Exogenous Cinnamic Acids on the Growth and Physiological Characteristics of Cucumber Seedlings

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Agricultural Sciences in China 2005年第10期4卷 747-751页

作者： CHEN Li-xin WU Feng-zhi MA Feng-ming Northeast Agricultural University Harbin 150030 P.R.China Heilongjiang Academy of Agricultural Sciences Horticultual Sub-Academy Harbin 150069 P.R.China

In order to study the effects of exogenous cinnamic acids on plant growth, contents of photosynthetic pigment, root activities and ATPase activities of root membrane at cucumber seedling stage, the seedlings of Shandong Mici cucumber were tested. The results showed that seedlings growth, contents of photosynthetic pigment, root activities and ATPase activities of root membrane were inhibited by cinnamic acids. The growth and root activities of seedlings were significantly （P〈0.05） lower in the soil amended with 100 mg kg^-1 cinnamic acids compared to the control. The contents of chlorophyll a, chlorophyll a＋b and carotenoid of seedlings significantly （P〈0.05） decreased in the soil amended with 200 mg kg^-1 cinnamic acids, whereas ATPase activities exhibited a higher sensitivity and greatly decreased in the soil amended with 50 mg kg^-1 cinnamic acids. These results suggested that cinnamic acids could induce a stress condition, and the stress intensities increased with enhanced cinnamic acid concentration.

关键词： Cucumber Cinnamic acids photosynthetic pigment Root activities ATPase