Relationships between C/N metabolism and rice growth related indicators under alternating drought and flooding stress
The increasing frequency of drought and flooding events due to climate change exposes rice to intensified alternating drought and flooding stress during different growth stages. To elucidate the impacts of alternating drought and flooding stress on rice growth and carbon (C) and nitrogen (N) metabol...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-12-01
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| Series: | Agricultural Water Management |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0378377424004876 |
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| author | Zhenchang Wang Yuexiong Wang Rangjian Qiu Xiangping Guo Bingqi Xiao Jinjing Liu Cheng Hong Minghao Tian Xiaoman Qiang |
| author_facet | Zhenchang Wang Yuexiong Wang Rangjian Qiu Xiangping Guo Bingqi Xiao Jinjing Liu Cheng Hong Minghao Tian Xiaoman Qiang |
| author_sort | Zhenchang Wang |
| collection | DOAJ |
| description | The increasing frequency of drought and flooding events due to climate change exposes rice to intensified alternating drought and flooding stress during different growth stages. To elucidate the impacts of alternating drought and flooding stress on rice growth and carbon (C) and nitrogen (N) metabolism, five irrigation regimes were established: alternating cycle of light drought-flooding-light drought during the tillering stage (T-LD), heavy drought-flooding-heavy drought during the tillering stage (T-HD), light drought-flooding-light drought during the jointing stage (J-LD), heavy drought-flooding-heavy drought during the jointing stage (J-HD), and frequent irrigation with shallow water depth (0–5 cm) for growth stages except for the maturation stage (CK). The results indicated that the tiller numbers, K+ concentrations in leaves, and above-ground biomass subjected to T-HD and T-LD treatments were significantly lower than in CK, J-HD and J-LD. Compared to CK, T-LD enhanced chlorophyll content and nitrate reductase activity (NRA) in rice leaves, leading to elevated photosynthetic rates (Pn) and improved δ13C values. The δ15N values under the CK, T-HD, and T-LD treatments were significantly greater than those under the J-HD and J-LD treatments (p<0.05). Additionally, NRA showed a significant positive correlation with leaf N concentration during the jointing stage. Path analysis indicates that δ13C, leaf water content, tiller number, leaf area, K⁺ concentration, and N concentration were directly related to above-ground biomass, whereas photosynthetic parameters indirectly affected biomass through N-metabolism related indicators. This result offers a theoretical support for the scheduling of irrigation and drainage practices in the field. |
| format | Article |
| id | doaj-art-29df1746167342eaac9dcf6dd96fd39b |
| institution | OA Journals |
| issn | 1873-2283 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Agricultural Water Management |
| spelling | doaj-art-29df1746167342eaac9dcf6dd96fd39b2025-08-20T02:39:08ZengElsevierAgricultural Water Management1873-22832024-12-0130610915110.1016/j.agwat.2024.109151Relationships between C/N metabolism and rice growth related indicators under alternating drought and flooding stressZhenchang Wang0Yuexiong Wang1Rangjian Qiu2Xiangping Guo3Bingqi Xiao4Jinjing Liu5Cheng Hong6Minghao Tian7Xiaoman Qiang8College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China; Corresponding author.College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, ChinaState Key Laboratory of Water Resources Engineering and Management, School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, ChinaCollege of Agricultural Science and Engineering, Hohai University, Nanjing 210098, ChinaCollege of Agricultural Science and Engineering, Hohai University, Nanjing 210098, ChinaCollege of Agricultural Science and Engineering, Hohai University, Nanjing 210098, ChinaCollege of Agricultural Science and Engineering, Hohai University, Nanjing 210098, ChinaCollege of Agricultural Science and Engineering, Hohai University, Nanjing 210098, ChinaKey Laboratory of Crop Water Use and Regulation, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Science, Ministry of Agriculture and Rural Affairs, Xinxiang 453003, ChinaThe increasing frequency of drought and flooding events due to climate change exposes rice to intensified alternating drought and flooding stress during different growth stages. To elucidate the impacts of alternating drought and flooding stress on rice growth and carbon (C) and nitrogen (N) metabolism, five irrigation regimes were established: alternating cycle of light drought-flooding-light drought during the tillering stage (T-LD), heavy drought-flooding-heavy drought during the tillering stage (T-HD), light drought-flooding-light drought during the jointing stage (J-LD), heavy drought-flooding-heavy drought during the jointing stage (J-HD), and frequent irrigation with shallow water depth (0–5 cm) for growth stages except for the maturation stage (CK). The results indicated that the tiller numbers, K+ concentrations in leaves, and above-ground biomass subjected to T-HD and T-LD treatments were significantly lower than in CK, J-HD and J-LD. Compared to CK, T-LD enhanced chlorophyll content and nitrate reductase activity (NRA) in rice leaves, leading to elevated photosynthetic rates (Pn) and improved δ13C values. The δ15N values under the CK, T-HD, and T-LD treatments were significantly greater than those under the J-HD and J-LD treatments (p<0.05). Additionally, NRA showed a significant positive correlation with leaf N concentration during the jointing stage. Path analysis indicates that δ13C, leaf water content, tiller number, leaf area, K⁺ concentration, and N concentration were directly related to above-ground biomass, whereas photosynthetic parameters indirectly affected biomass through N-metabolism related indicators. This result offers a theoretical support for the scheduling of irrigation and drainage practices in the field.http://www.sciencedirect.com/science/article/pii/S0378377424004876Water-saving irrigationδ13Cδ15NNitrate reductase activityK+ |
| spellingShingle | Zhenchang Wang Yuexiong Wang Rangjian Qiu Xiangping Guo Bingqi Xiao Jinjing Liu Cheng Hong Minghao Tian Xiaoman Qiang Relationships between C/N metabolism and rice growth related indicators under alternating drought and flooding stress Agricultural Water Management Water-saving irrigation δ13C δ15N Nitrate reductase activity K+ |
| title | Relationships between C/N metabolism and rice growth related indicators under alternating drought and flooding stress |
| title_full | Relationships between C/N metabolism and rice growth related indicators under alternating drought and flooding stress |
| title_fullStr | Relationships between C/N metabolism and rice growth related indicators under alternating drought and flooding stress |
| title_full_unstemmed | Relationships between C/N metabolism and rice growth related indicators under alternating drought and flooding stress |
| title_short | Relationships between C/N metabolism and rice growth related indicators under alternating drought and flooding stress |
| title_sort | relationships between c n metabolism and rice growth related indicators under alternating drought and flooding stress |
| topic | Water-saving irrigation δ13C δ15N Nitrate reductase activity K+ |
| url | http://www.sciencedirect.com/science/article/pii/S0378377424004876 |
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