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Monitoring Flue-Cured Tobacco Leaf Chlorophyll Content under Different light Qualities by Hyperspectral Reflectance

American Journal of Plant Sciences 2020年第8期11卷 1217-1234页

作者： Fangfang Jia Shuang Han Dong Chang Haitao Yan Yueqi Xu Wenna Song School of Life Sciences Shangqiu Normal University Shangqiu China School of Information Engineering Zhengzhou University Zhengzhou China Henan Pingdingshan Municipal Tobacco Company Pingdingshan China

Rapid assessment of foliar chlorophyll content in tobacco is critical for assessment of growth and precise management to improve quality and yield while minimizing adverse environmental impact. Our objective is to develop a precise agricultural practice predicting tobacco-leaf chlorophyll-a content. Reflectance experiments have been conducted on flue-cured tobacco over 3 consecutive years under different light quality. Leaf hyperspectral reflectance and chlorophyll-a content data have been collected at 15-day intervals from 30 days after transplant until harvesting. We identified the central band that is sensitive to tobacco-leaf chlorophyll-a content and the optimum wavelength combinations for establishing new spectral indices (simple ratio index, RVI;normalized difference vegetation index, NDVI;and simple difference vegetation index, DVI). We then established linear and BackPropagation (BP) neural network models to estimate chlorophyll-a content. The central bands for leaf chlorophyll-a content are concentrated in the visible range (410 - 680 nm) in combination with the shortwave infrared range (1900 - 2400 nm). The optimum spectral range for the spectral band combinations RVI, NDVI, and DVI are 440 and 470 nm, 440 and 470 nm, and 440 and 460 nm, respectively. The linear RVI, NDVI, and DVI models, SMLR model and the BP neural network model have respective R2

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Research Progress on the Effect of light on Plant Growth

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Agricultural Biotechnology 2022年第3期11卷 38-44页

作者： Xuejing DONG Liba XU Miao ZHANG Ying WANG Hua ZHU Guangxi University of Chinese Medicine Nanning 530200China Guangxi Key Laboratory of Zhuang and Yao Ethnic Medicine Nanning 530200China

light is one of the important factors affecting plant growth and has an important impact on plant growth and *** this paper,the effects of light on plant growth,development,and physiological and biochemical functions were reviewed from three aspects:light intensity and light quality on plant biomass,photosynthesis,and chemical components.

关键词： light intensity light quality Biomass Photosynthesis Chemical composition

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Research Progress of Dendrobium officinale Kimura et Migo

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Agricultural Biotechnology 2022年第5期11卷 8-14页

作者： Ying WANG Miao ZHANG XueJing DONG Liba XU Yongpeng WEI Hua ZHU Science Experimental Center of Guangxi University of Traditional Chinese Medicine Nanning 530200China

The effects of light on the quality and related genes of Dendrobium officinale were summarized, and the main chemical components and pharmacological effects of D. officinale were analyzed. The biomass accumulation of D. officinale is related to light quality and light intensity. Monochromatic light quality can make polysaccharide accumulate, and mixed light quality can promote cell proliferation and component accumulation of D. officinale. Under different light intensity, the polysaccharide content of D. officinale is different, and it changes with the change of light intensity. When a certain intensity is exceeded, the polysaccharide content decreases with the increase of light intensity. The chemical components of D. officinale are polysaccharides, alkaloids, amino acids, volatile components, etc. The analysis of the growth and components of D. officinale provides reference and basis for improving the quality and chemical components of D. officinale and promotes the research and development of related products of D. officinale.

关键词： Dendrobium officinale Kimura et Migo light quality Illumination intensity Chemical composition

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Effects of Different light Qualities on Activity and Gene Expression of Caspase-like Proteases in Tobacco Leaves

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Agricultural Science & Technology 2012年第2期13卷 276-279,338页

作者：赵娟柯学徐超华李军营龚明云南师范大学生命科学学院云南昆明650092 生物能源持续开发利用教育部工程研究中心云南昆明650092 云南省生物质能与环境生物技术重点实验室云南昆明650092 中国农业大学水利与土木工程学院北京100083 云南省烟草农业科学研究院云南玉溪653100

[Objective] The study aimed to investigate the activity and gene expression of caspase-like proteases in tobacco leaves growing under different light qualities. [Method] By covering tobacco plants with white, red, yellow, blue and purple films to obtain different light quality, the changes of chlorophyll content, activity and gene expression of caspase-like proteases in the tobacco leaves were studied. [Results] Compared with treatments of white, red and yellow film, blue and purple films delayed the decrease of chlorophyll content and senescence of tobacco leaves at the late growth stage, and relatively lowered the activity and gene expression of caspase-like proteases during growth, development and senescence periods. [Conclusion] Different light qualities exhibited various effects on the growth, development and senescence of tobacco leaves, possibly by affecting the activity and gene expression of caspase-like proteases to some extent.

关键词： light quality Tobacco leaves Growth and development Caspase-like proteases

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The Effect of the Novel "light fertilizer" on the Environment Factor in High Tunnel and Growth of Brassica Chinensis

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Agricultural Science & Technology 2014年第12期15卷 2245-2248页

作者：李文秀周宁琳陈园园王佳朱晓玲王振江徐磊冯伟民江苏省生物功能材料协同创新中心南京师范大学化学与材料科学学院江苏南京210023 江苏省生物医药功能材料工程研究中心江苏省生物功能材料重点实验室江苏南京210023 南京周宁琳新材料科技有限公司江苏南京211505 江苏省农业科学院农业设施与装备研究所江苏省农业科学院蔬菜研究所

[Objective] The aim was to study the properties of novel ＂light fertilizer＂, photo-conversion film, in order to evaluate its effect on the environmental factors and morphogenetic process of crops in the high tunnel. [Method] Photo-conversion film and Iongevous anti-dropping film were compared in terms of light, air and soil temperature utilizing the Facilities of leafy agriculture high tunnel intelligent monitoring system. Verifying the results by farmland experiment. [Result] Photo- conversion film indeed improved the light quality of high tunnel compared with the Iongevous anti- dripping film. The air and soil temperature was raised several degrees. Results of farmland experiment show that the average value of brassica chinensis fresh weight increased 19.15% compared to the control. [Conclusion] Photo-conversion film promotes more crop growth than Iongevous anti-dropping film due to improvement of light quality, air and soil temperature.

关键词： Photo-conversion film Environmental factors light quality Warming light quality Yield increase Brassica chinensis

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