Note on relationship between leaf soluble carbohydrate and chlorophyll concentrations in maize during leaf senescence |
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| Institution: | 1. Department of Plant Agriculture, Crop Science Division, University of Guelph, Guelph, Ontario, Canada N1G 2W1;2. Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada K1A 0C6;1. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;2. International Ecosystem Management Partnership, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100102, China;3. The State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China;4. The Bureau of Agriculture and Rural Affairs in Huantai County, Huantai 256400, China;1. Key Laboratory of Crop Water Use and Regulation, Ministry of Agriculture, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, 380 Hongli road, Xinxiang, Henan 453003, PR China;2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu, 210008, PR China;3. Henan Institute of Science and Technology, Xinxiang, Henan 453003, PR China;1. College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China;2. Center of Agricultural Engineering and Technical Research for Lowland Plain of Hebei, Wuqiao 061802, China;1. Cátedra de Cerealicultura, Departamento de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Argentina;2. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA)- Consejo Nacional de Investigaciones Científicas y Técnicas-(CONICET), Facultad de Agronomía, Universidad de Buenos Aires, Argentina;1. Key Laboratory of Crop Water Use and Regulation, Ministry of Agriculture, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, 380 Hongli road, Xinxiang, Henan 453003, PR China;2. College of Agricultural Equipment Engineering, Henan University of Science and Technology, Luoyang, Henan 471000, PR China;3. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu, 210008, PR China;4. Institute of Agricultural Economics and Information, Henan Academy of Agricultural Sciences, Zhengzhou 450002, PR China;5. INRA Centre Poitou- Charentes Les Verrines CS80006, 86600 Lusignan, France;1. Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Jiangsu Province, China;2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Jiangsu Province, China;3. Jiangxi Key Laboratory of Ecological Research of Red Soil, Experimental Station of Red Soil, Chinese Academy of Sciences, Jiangxi Province, China |
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| Abstract: | Leaf senescence is typically associated with loss of chlorophyll and decline in photosynthetic capacity. The objectives of this study were: (i) to quantify the relationship between chlorophyll (SPAD) and soluble-carbohydrate concentrations in maize (Zea mays L.) leaves during leaf senescence and (ii) to examine whether this relationship differed between an old and a recent maize hybrid. Field experiments were conducted in 1995 at two locations. A range of leaf soluble-carbohydrate concentrations and SPAD values was obtained through various source-manipulation of source activity by defoliation and thinning. Defoliation treatments were imposed at 3, 4, and 5 weeks after silking. The thinning treatment was imposed at 3 weeks after silking. Two maize hybrids were composed: Pride 5 (old) and Pioneer 3902 (recent). Leaves at three leaf positions, near the topmost ear and the ear internode were sampled at weekly intervals, from 3 weeks after silking until visual completion of leaf senescence. Leaf and internode soluble-carbohydrate concentration declined following defoliation, although the response in leaves was delayed compared to that in the stem. SPAD readings and soluble-carbohydrate concentrations were positively correlated below a plateau value of 55 mg glucose equivalents g?1 leaf. The correlation between SPAD and soluble-carbohydrate concentration was similar for the old and recent maize hybrid. |
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