Gibberellin-enhanced elongation of inverted Pharbitis nil shoot prevents the release of apical dominance |
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| Institution: | 1. State Key Laboratory of Chemical Engineering, Institute of Pharmaceutical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;2. School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, USA;3. College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;4. ZJU-Hangzhou Global Scientific and Technological innovation Center, Hangzhou 311215, China;1. Department of Plant Sciences, Quaid-i-Azam University, Islamabad, 45320, Pakistan;2. Department of Soil Science and Plant Nutrition, Cukurova University, Adana, 1150, Turkey;3. Department of Soil Science, The University of Haripur, Haripur, 22630, Khyber Pakhtunkhwa, Pakistan;4. Department of Environmental Sciences and Engineering, Government College University, Allama Iqbal Road, Faisalabad, 38000, Pakistan;1. Instituto de Agrobiotecnología del Litoral (CONICET, Universidad Nacional del Litoral, FBCB), Colectora Ruta Nacional 168, km 0, 3000 Santa Fe, Argentina;2. Centro Nacional de Biotecnología (CNB) - CSIC, Madrid, Spain;1. State Key Laboratory of Protein and Plant Gene Research, School of Advanced Agricultural Sciences and School of Life Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China;1. Institute of Science and Technology (IST) Austria, 3400 Klosterneuburg, Austria;2. Department of Plant Systems Biology, VIB and Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Gent, Belgium;3. Key Laboratory of Protected Horticulture of Liaoning Province, Shenyang Agriculture University, Shenyang 110161, P.R.C.;4. Mendel Centre for Genomics and Proteomics of Plants Systems, CEITEC MU - Central European Institute of Technology, Masaryk University, 625 00 Brno, Czech Republic;1. National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Ethylene evolution resulting from the gravity stress of shoot inversion appears to induce the release of apical dominance in Pharbitis nil (L.) by inhibiting elongation of the inverted shoot. It has been previously demonstrated that this shoot inversion release of apical dominance can be prevented by promoting elongation in the inverted shoot via interference with ethylene synthesis or action. In the present study it was shown that apical dominance release can also be prevented by promoting elongation of the inverted shoot via treatment with gibberellic acid (GA3). A synergistic effect was observed when AgNO3, the ethylene action inhibitor, was applied with GA3. Both GA3 and AgNO3 increased ethylene production in the inverted shoot. These results are consistent with the view that it is ethylene-induced inhibition of elongation and not any direct effect of ethylene per se which is responsible for the outgrowth of the highest lateral bud. |
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