Effect of pruned methods on photosynthesis and distribution pattern of assimilate of sweet pepper in solar greenhouse.

This paper studied the effects of 3 pruned methods(2 stems,3 stems and 4 stems pruned method)on photosynthetic gas exchange parameters,transpiration and distribution pattern of assimilate.The result showed that net photosynthetic rate(Pn),stomatal conductance(Gs),stomatal limitation value(Ls),transpiration rate(Tr)and water use efficiency(WUE)were in upper leavesin middle leavesin lower leaves under 3 pruned methods.In middle or lower leaves the decrease of Pn was considered as a result of non-stomata restriction.Compared with 2 stems pruned method,the Tr in upper or middle leaves,and WUE in lower leaves of 3 or 4 stems pruned method increased.Under 3 pruned methods,the distribution pattern of assimilate to fruits was the highest,the next was to stems and leaves,and the distribution of assimilate to root was the lowest.Compared with 2 stems pruned method,per plant yield and weight of single fruit of sweet pepper were significantly increased under 3 or 4 stems pruned method.