Effects of partial shading of the potato plant on photosynthesis of treated leaves,leaf area expansion and allocation of nitrogen and dry matter in component plant parts |
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| Institution: | 1. Institute of Agricultural Engineering, Agricultural Research Organization, The Volcani Center, P.O.B 15159, Rishon LeZion 7528809, Israel;2. Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, P.O.B 15159, Rishon LeZion 7528809, Israel;3. Mop Darom, Besor Experimental Station, Mobile Post 4, 85400, Israel;4. HIT – Holon Institute of Technology, POB 305, Holon 58102, Israel;1. Faculty of Medical Sciences, The University of the West Indies, Cave Hill, Bridgetown, Barbados;2. Department of Anatomy, Sree Balaji Medical College and Hospital, BIHER, Chennai 44, India;3. The Queen Elizabeth Hospital, Bridgetown, Barbados;1. Centro de Edafología y Biología Aplicada del Segura, CEBAS-CSIC, Murcia, Spain;2. Physics and Computer Architecture Department, Universitas Miguel Hernandez, Ctra Beniel 3.2, 03312 Orihuela, Alicante, Spain;3. Plant Science and Microbiology Department, Universitas Miguel Hernandez, Ctra Beniel 3.2, 03312 Orihuela, Alicante, Spain;4. Department of Economic and Financial Studies, Universitas Miguel Hernández, Avda. de la Universidad, s/n, 03202, Elche, Alicante, Spain;1. INFN Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 1 -00133 Roma, Italy;2. INFN Sezione di Roma, P.le Aldo Moro, 2 -00185 Roma, Italy;1. Department of Horticultural Science, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch 7602, South Africa;2. Centre for Statistical Consultation, Department of Statistics and Actuarial Sciences, Stellenbosch University, Stellenbosch 7602, South Africa;1. Department of Biomedical Sciences for Health, Functional Anatomy Research Center (FARC), Laboratory of Functional Anatomy of the Stomatognathic System (LAFAS), Faculty of Medicine and Surgery, Università degli Studi di Milano, Milan, Italy;2. Department of Medical and Surgical Specialties, Radiologic Sciences, and Public Health, Dental Clinic, Università degli Studi di Brescia, Brescia, Italy;3. Department of Clinical Sciences and Community Health, Institute of Medical Statistics and Biometry “G.A. Maccacaro,” University of Milan, Milan, Italy;4. Department of Ophthalmology, Otolaryngology, and Head and Neck Surgery, Faculty of Medicine, University of São Paulo, Ribeirão Preto, São Paulo, Brazil;5. Unit of Medical Statistics and Biometry, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy |
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| Abstract: | Literature shows that the distribution of nitrogen (N) over leaf layers tends to follow the distribution of light. Nitrogen is regarded as moving away from poorly illuminated leaves. If operative in plant canopies, such mechanisms affect leaf longevity and the allocation of N and dry matter to plant parts. To examine such mechanisms in potato (Solanum tuberosum L.) we conducted pot experiments with spaced plants in which the primary axis of the plant was subjected to shade treatments (50 or 90% shade), while the apical branches of the plant were illuminated as the control plants. N treatments were a limiting rate of N supply (N1) and a high rate of N supply (N2). Changes in leaf area, dry weight, N content (organic N and nitrate) and light saturated photosynthetic rate (Pmax) were recorded for particular leaf numbers. Leaf area, dry weights and total N content of all component plant parts were determined. Shaded leaves showed a lower specific leaf weight while leaf area was not affected. Fifty percent shade had little effect on age-related changes of leaf properties, but leaves senesced fast when subjected to 90% shade. Shading the primary axis enhanced apical branching, increased sizes of individual leaves and reduced stem:leaf weight ratio of non-shaded apical branches; partitioning of dry matter and nitrogen to tubers was less than in controls. It was concluded that these changes were not associated with enhanced remobilization of N from shaded plant parts; nor were they related to enhanced senescence of shaded leaves. |
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