Effects of TRIA-LDH on physiological characteristics of drought resistance in winter wheat
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 treat-ments 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)Com-pared 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 wa-ter 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.
triacontanollayered double hydroxide nano-carrierwinter wheatwater use efficiencydrought re-sistance
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