Effects of TRIA-LDH on physiological characteristics of drought resistance in winter wheat
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DOI:10.7606/j.issn.1000-7601.2024.01.14
Key Words: triacontanol  layered double hydroxide nano\|carrier  winter wheat  water use efficiency  drought resistance
Author NameAffiliation
ZHANG Xin Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation, Key Laboratory of Dryland Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100081, China 
WANG Chong Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation, Key Laboratory of Dryland Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100081, China 
LI Li Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation, Key Laboratory of Dryland Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100081, China 
WANG Chao Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation, Key Laboratory of Dryland Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100081, China 
MA Haiyang Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation, Key Laboratory of Dryland Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100081, China 
XING Jiayi Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation, Key Laboratory of Dryland Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100081, China 
WANG Yaosheng Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation, Key Laboratory of Dryland Agriculture, Ministry of Agriculture and Rural Affairs, Beijing 100081, China 
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Abstract:
      A pot experiment in the climatic chamber was conducted with the variety ‘XR4347’ of winter wheat. The experiment included three spraying types with commercial triacontanol microemulsion (TRIA, T1), LDH-loaded triacontanol nano\|preparation (TRIA-LDH, T2) and blank control (T3), and three water treatments with 90% (well\|watered, W1), 60% (moderately water-stressed, W2) and 40% (severely water\|stressed, W3) of the field capacity. The reslut showed that: (1) Under the same water treatment, TRIA and TRIA-LDH treatments had a positive impact on the net photosynthetic rate of wheat. Compared with the control treatment, under the moderate water stress, TRIA and TRIA-LDH treatments increased the above\|ground dry biomass of wheat by 69.9% and 32.7%, and the WUE by 32.2% and 16.4%, respectively. Particularly under severe water stress, the TRIA-LDH treatment significantly decreased water consumption by 24.0% compared with the TRIA treatment. It concurrently increased above\|ground dry biomass, leading to a significant improvement in WUE by 13.6%. (2) Compared with the TRIA treatment, the activity of catalase (CAT) and superoxide dismutase (SOD) under moderate water stress in wheat leaves sprayed with TRIA-LDH significantly increased by 2 folds, and SOD under severe water stress in wheat leaves sprayed with TRIA-LDH significantly increased by 1 fold, indicating that TRIA-LDH had a higher effect on antioxidant enzyme activities than TRIA. (3) Under severe water stress, the ABA content of wheat leaves sprayed with TRIA-LDH and TRIA decreased significantly by 21.8% and 30.9% compared with the control, indicating that exogenous triacontanol (TRIA-LDH and TRIA) effectively alleviated the water stress on plant growth by reducing the ABA content of leaves under severe water stress. (4) Under severe water stress, wheat plants sprayed with TRIA presented a large Ca2+ efflux in guard cells, while the Ca2+ influx in guard cells of wheat plants sprayed with TRIA-LDH was observed, demonstrating that plants had better absorption and utilization of TRIA-LDH. Under water stress, TRIA-LDH enhanced the drought resistance and improved the WUE of wheat. Therefore, LDH nano\|carrier can be used to load triacontanol and achieve the efficient and sustainable regulation of triacontanol to plants.