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中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： Le CHANG,Shi-Gang HE~* State Key Laboratory of Brain and Cognitive Sciences,Institute of Biophysics,Chinese Academy of Sciences,Beijing 100101,China

＜正＞Objective light adaptation is a prominent feature of visual *** gain and accelerated kinetics are commonly accepted as the basic characteristics of light adaptation,but most of the jobs were done by a simple stimulus （brief light pulse imposed on different backgrounds） that might overlook the complexity of adaptation *** explore this issue,we used a set of stimuli that could better characterize the response ability of retinal *** Retinal ganglion cells are recorded in whole mount preparation by patch clamp technique（on-cell and whole-cell recording）. Bipolar cells are recorded in slice ***（1） A square flicker pattern will postpone the rising phase of light responses to individual flicker in On-alpha ganglion cells.（2） This delay is not inconsistent with previous descriptions of accelerated kinetics in light adapted condition,and it could be observed more directly in the recovery phase（after the switch from high light background to darkness）.（3） With whole-cell recordings from ganglion cells and bipolar cells,we found that threshold-type nonlinearity at bipolar-ganglion synapse contributes to this delay of rising *** Conventional non-spiking neurons in retina could also produce threshold-type nonlinearity,and it imposes constraints on light adaptation strategy in visual neurons.

关键词： retina light adaptation temporal coding nonlinearity alpha ganglion cells bipolar cells.

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Differences in leaf physiological and morphological traits between Camellia japonica and Camellia reticulata

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Plant Diversity 2020年第3期42卷 181-188页

作者： Ji-Hua Wang Yan-Fei Cai Shi-Feng Li Shi-Bao Zhang Flower Research Institute of Yunnan Academy of Agricultural Sciences KunmingChina Key Laboratory for Economic Plants and Biotechnology Kunming Institute of BotanyChinese Academy of SciencesKunmingChina National Engineering Research Center for Ornamental Horticulture KunmingChina

Plants of the genus Camellia are widely cultivated throughout the world as ornamentals because of their bright and large *** widely cultivated varieties are mainly derived from the mutant lines and hybrid progenies of Camellia japonica *** Camellia reticulata *** their geographical distributions and environmental adaptabilities are significantly different,no systematic comparison has been conducted between these two *** investigate differences in how these plants have adapted to their environments,we measured photosynthesis and 20 leaf functional traits of *** and *** grown under the same *** with ***,*** showed higher values for light saturation point,light-saturated photo synthetic rate,leaf dry mass per unit area and stomatal area,but lower values for apparent quantum efficiency,leaf size,stomatal density and leaf nitrogen content per unit *** area was positively correlated with light-saturated photosynthetic rate and light saturation point,but negatively correlated with stomatal *** differences between *** and *** were mainly reflected in their adaptations to light intensity and leaf morphological *** is better adapted to high light intensity than *** difference is related to the two species’ differing life fo ***,leaf morphological traits have played an important role in the light adaptation of *** and ***,and might be first noticed and selected during the breeding *** findings will contribute to the cultivation of camellia plants.

关键词： Camellia light adaptation Leaf traits Ornamental plant Photosynthesis

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维普期刊数据库

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Growth and photosynthetic responses of Fraxinus mandshurica seedlings to various light environments

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Journal of Forestry Research 2011年第3期22卷 341-346页

作者： WANG Kai ZHU Jiao-jun YAN Qiao-ling YU Li-zhong SUN Yi-rong Qingyuan Experimental Station of Forest Ecology Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 P. R. China Graduate University of Chinese Academy of Sciences Beijing 100039 P. R. China Qingyuan Experimental Station of Forest Ecology Institute of AppliedEcology Chinese Academy of Sciences Shenyang 110016 P. R. China

To determine light requirement and adaptability of Fraxinus mandshurica seedlings, the seasonal variations of photosynthetic variables were measured in 3-year-old seedlings grown under four light levels （100%, 60%, 30%, and 15% of full sunlight） with a LI-6400 portable photosynthesis system. The leaf chlorophyll content, special leaf weight, annual height and basal diameter increment of seedlings were also observed. The maximum and minimum values of net photosynthetic rate, maximum rate of carboxylation, and maximum rate of electron transport of F. mandshurica seedlings were detected with 60% and 15% of full sunlight treatments, respectively. With the decrease of light level, both light saturation point and special leaf weight significantly declined （p 0.05）, but leaf chlorophyll content significantly increased （p 0.05）. Annual height and basal diameter increments of seedlings grown under 60% of full sunlight treatment were significantly greater than those of seedlings under other treatments （p 0.05）. It was concluded that F. mandshurica seedlings can adapt to a wide range of light environments from 15% to 100% of full sunlight by adjusting light saturation point, leaf chlorophyll content and special leaf weight. According to the maximum of relative growth, 60% of full sunlight treatment is the optimum light level for the growth of 3-year-old F. mandshurica seedlings.

关键词： Fraxinus mandshurica light adaptation plasticity seasonal dynamics secondary forest

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