1
|
Yamashita H, Nishina Y, Komori N, Kamoshita M, Oya Y, Okuno K, Morita A, Ikka T. Cesium uptake and translocation from tea cutting roots (Camellia sinensis L.). J Environ Radioact 2021; 235-236:106655. [PMID: 34034207 DOI: 10.1016/j.jenvrad.2021.106655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 05/13/2021] [Accepted: 05/15/2021] [Indexed: 06/12/2023]
Abstract
To estimate the uptake of radiocesium (137Cs) by tea plant roots, 1-year-old rooted tea cuttings (Camellia sinensis L. cv. Yabukita) at the time of bud opening were cultivated hydroponically for 27 days in pots containing nutrient solutions with or without 137CsCl (600 Bq mL-1). Total 137Cs radioactivity of whole tea plants were 6.1 kBq g-1 dry weight. The plant/solution 137Cs transfer factors of different tissues were in the range of 2.6 (in mature leaves) to 28.2 mL g-1 dry weight (in roots), which were lower than those reported in wheat and spinach. In total, 69% of 137Cs remained in roots and 31% was transported from roots to shoots. The results indicated that 137Cs was preferentially translocated to new shoots, which are used for manufacturing tea, over mature leaves.
Collapse
Affiliation(s)
- Hiroto Yamashita
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan; United Graduate School of Agricultural Science, Gifu University, 1-1 Yanagito, Gifu, 501-1193, Japan
| | - Yoshifumi Nishina
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Naho Komori
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Mizuho Kamoshita
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Yasuhisa Oya
- Radioscience Research Laboratory, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Kenji Okuno
- Radioscience Research Laboratory, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Akio Morita
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan; Institute for Tea Science, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan
| | - Takashi Ikka
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan; Institute for Tea Science, Shizuoka University, 836 Ohya, Shizuoka, Shizuoka, 422-8529, Japan.
| |
Collapse
|
2
|
Ikka T, Nishina Y, Kamoshita M, Oya Y, Okuno K, Morita A. Radiocesium uptake through leaf surfaces of tea plants (Camellia sinensis L.). J Environ Radioact 2018; 182:70-73. [PMID: 29197749 DOI: 10.1016/j.jenvrad.2017.11.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Revised: 11/09/2017] [Accepted: 11/21/2017] [Indexed: 06/07/2023]
Abstract
To clarify the source of radiocesium detected in newly emerged tea leaves contaminated just before the time of bud opening by fallout of radionuclides from Fukushima Dai-ichi Nuclear Power Plant, 137CsCl solution (0.185 M Bq mL-1) was applied to the front or the backside surfaces of mature leaves of tea plant (Camellia sinensis L. cv. Yabukita) at the time of bud opening. A 21 days after foliar application, the buds had grown and developed to the three- or four-leaf stage. In the front treatment, almost all (95%) of the applied 137Cs was present in the mature leaves (hot mother leaves). In the backside treatment, 68% of applied 137Cs also remained in hot mother leaves, but 22% and 10% was found in the new shoots attached to hot mother leaves and the other parts (non-applied mature leaves, stems and roots), respectively. The images of a hot leaf and its attached new shoots by imaging plate analysis revealed that the results coincided with those of the 137Cs distribution above. These suggested that radiocesium was primarily absorbed from the backside surface of tea leaves through the stoma, and then the greater part was transported to newly emerged tea organs during the new shoot growth period.
Collapse
Affiliation(s)
- Takashi Ikka
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
| | - Yoshifumi Nishina
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
| | - Mizuho Kamoshita
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
| | - Yasuhisa Oya
- Radioscience Research Laboratory, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
| | - Kenji Okuno
- Radioscience Research Laboratory, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan
| | - Akio Morita
- Laboratory of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan.
| |
Collapse
|