Root growth,aerenchyma development,and oxygen transport in rice genotypes subjected to drought and waterlogging |
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| Authors: | Roel R Suralta Akira Yamauchi |
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| Institution: | 1. Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan;2. Aichi Prefecture Agricultural Research Center, 1-1, Aza-Sagamine, Oaza-Yazako, Nagakute-cho, Aichi-gun 480-1193, Japan;3. Agricultural Production Division, Aichi Prefectural Government, 3-1-2, Sannomaru, Naka-ku, Nagoya 460-8501, Japan;1. College of Agronomy, Northeast Agricultural University, Harbin, 150030, China;2. Institute of Soil Fertilizer and Environment Resources, Heilongjiang Academy of Agricultural Sciences, Harbin, 150086, China;1. Department of Plant Science, The Pennsylvania State University, University Park, PA 16802, USA;2. Department of Crop and Soil Sciences, Lilongwe University of Agriculture and Natural Resources, Bunda College, Lilongwe, Malawi;1. University of Agriculture in Kraków, Faculty of Agriculture and Economics, Department of Plant Physiology, Pod?u?na 3, 30-239 Kraków, Poland;2. The Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Kraków, Poland;1. University of the Philippines Los Baños College, Laguna 4031, Philippines;2. International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines;3. Philippine Rice Research Institute, Murcia, Negros Occidental, Philippines;4. National University of Malaysia, 43600, UKM Bangi, Selangor, Malaysia |
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| Abstract: | Soils under field conditions may experience fluctuating soil water regimes ranging from drought to waterlogging. The inability of roots to acclimate to such changes in soil water regimes may result in reduced growth and function thereby, dry matter production. This study compared the root and shoot growth, root aerenchyma development, and associated root oxygen transport of aerobic and irrigated lowland rice genotypes grown under well-watered (control), waterlogged, and droughted soil conditions for 30 days. The aerobic genotypes were as tolerant as the irrigated lowland genotypes under waterlogging because of their comparable abilities to enhance aerenchyma that effectively facilitated O2 diffusion to the roots for maintaining root growth and dry matter production. Under drought, aerobic genotypes were more tolerant than the irrigated lowland genotypes due to their higher ability to maintain nodal root production, elongation, and branching, thus, less reduction in dry matter production. Aerenchyma was also formed in droughted roots regardless of genotypes, but was resistant to internal O2 transport under O2 deficiency. The ability of roots to resist temporal variations in drought and waterlogging stresses might have strong implications for the adaptation of rice growing in environments with fluctuating soil water regimes. |
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