| Using Yangmai13 as the material,we investigated the impacts of asymmetric warming on the photosynthesis and yield of wheat based on field study with FATI (Free Air Temperature Increased) facility.During the winter (November 13 to March 14 next year),three kinds of treatments of the day and night warming (DN),night (N) and day (D) warming were set up to analyze the changes of photosynthetic parameters and yield under different warming treatments during over wintering stage and booting stage.The results showed that,during wintering stage,the apparent quantum yield,light saturation point,and actual photochemical efficiency of PSⅡwere higher in DN treatment than CK with the increase of 28.21%,16.32% and 43.78%,respectively;Compared with CK,the apparent quantum yield,light saturation point,and actual photochemical efficiency of PSⅡ in N and D treatments increased by 15.38%,13.67%,81.93% and 7.69%,0.99% and 1.61%,respectively;The apparent quantum yield,light saturation point,and actual photochemical efficiency of PSⅡ in N treatment reached their minimum values at booting stage.And these indexes were decreased by 3.33%,1.87% and 4.91%,compared with CK,respectively;DN and N treatments significantly improved the photosynthetic capacity of winter wheat at wintering stage.Three warming treatments leaded to a decline in photosynthetic capacity at booting stage,but compared with CK,there was no significant difference in the grain number per spike and 1 000 grain weight of winter wheat among three warming treatments.Warming winter increased the number of spike.The yield of D and DN treatments were increased,but that of N treatment was reduced. |
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