Effect of Exogenous Hormones IAA and 6-BA on Photosynthetic Characteristics of 'Bofeng' Walnut(Juglans regia)

Taking ‘Bofeng'walnut of 3-years-old as material,effect of IAA and 6-BA on photosynthetic characteristics in foliar spraying by using portable photosynthesis system LI-6400 were studied.The results showed that spraying 100mg/L IAA to‘Bofeng'walnut could improve their ability to adapt to light environment,while spraying 100mg/L 6-BA role was not very clear.After spraying 100mg/L IAA its diurnal variation of a single peak,the net photosynthetic rate was significantly higher than the the control group,its maximum value higher than the control group 10.699μmol· m-2·s-1;and after spraying 100mg/L 6-BA its diurnal variation curves for the bimodal curve,there was a clear midday depression,but the net photosynthetic rate was closer to the mean of the control group.