Effects Of Mixed Sowing On Photosynthetic Characteristics And Yield In Wheat Of Different Plant Types

Sowing patterns significantly affected canopy light interception in wheat populations,which in turn affected population photosynthetic characteristics.Therefore,in this experiment,the sowing pattern of widening the seedling band was used to optimize the canopy structure of the wheat population,improve the light energy utilization efficiency,and then increase the yield to achieve the goal of high yield and efficiency.This experiment was conducted at the Agricultural Experiment Station of Shandong Agricultural University from 2018 to 2019.The planting varieties were the compact variety SN20 and the loose line F287.The main area of this experiment is four mixed planting patterns of random mixed sowing(M),one row of SN20 and one row of F287(1:1),unicast Shannong 20(SN20),and unicast Fu 287(F287).There are four seedling widths: normal sowing(T1),two rows of 5 cm(T2),four rows of 24cm(T3),and six rows of 40 cm(T4).The main findings are as follows:1 Effect of mixed sowing on dry matter accumulation and transportation and yield of wheatT3 treatment significantly increased the grain weight and dry matter accumulation after anthesis of winter wheat variety SN20 and F287 at maturity,while 1:1 treatment significantly increased the grain weight and dry matter accumulation after anthesis of SN20 and compared with F287 had no significant effect.T3 treatment significantly increased the weight and yield of SN20 and its line of F287 thousand grains,while 1: 1 treatment significantly increased the weight and yield of SN20 thousand grains and had no significant effect on F287.2 Effects of mixed sowing on canopy structure of wheatThe 1: 1 treatment significantly increased the light energy transmittance of the upper layer of the winter wheat population,and at the same time ensured the middle layer light interception of the winter wheat group,so that the winter wheat group had a more reasonable light energy distribution in the vertical direction.And T3 treatment significantly enhanced the side effect of winter wheat population,making the population light distribution more reasonable in the horizontal direction.3 Effect of mixed sowing on flag leaf gas exchange parameters of wheatT3 treatment significantly increased the winter photosynthetic rate(Pn),stomatal conductance(Gs),and transpiration rate(Tr)of flag leaves after anthesis of SN20 and line F287 of winter wheat.Leaf intercellular carbon dioxide concentration(Ci).The 1:1 treatment significantly increased the Pn,Gs,and Tr flag leaf of SN20 after flowering,and significantlyreduced the Ci leaf of SN20 after flowering.Among them,the effect of 1:1+T3 treatment is the most significant,and it has no significant effect on F287.4 Effect of mixed sowing on flag leaf fluorescence parameters of wheatT3 treatment significantly reduced the maximum photochemical efficiency(Fv/Fm)and actual photochemical efficiency(ΦPSⅡ)of flag leaves after anthesis of winter wheat variety SN20 and line F287.The 1:1 treatment also significantly reduced the reduction in Fv/Fm andΦPSⅡ of SN20 after flowering,and had no significant effect on the winter wheat line F287.5 Effects of Mixed Sowing on Broad Seedling Belts on Photosynthetic Pigments in Wheat Flag LeavesT3 treatment significantly increased the chlorophyll content(Chl),chlorophyll a / b value,and carotenoid content(Car)of flag leaves of winter wheat variety SN20 and line F287 after flowering,and significantly reduced the decline.The 1:1 treatment significantly increased the flag leaf Chl,chlorophyll a/b value,and Car of SN20 after flowering,and had no significant effect on F287.6 Effects of Mixed Sowing on Key Enzymes in Calvin Cycle of WheatT3 treatment significantly increased flag leaf ribulose-1,5-bisphosphate carboxylase(Rubisco),glyceraldehyde 3-phosphate dehydrogenase(GAPDH),and fructose-1,6-bisphosphate esterase(FBPase),fructose-1,6-bisphosphate aldolase(Aldolase)activity.The1:1 treatment also significantly increased Rubisco,GAPDH,FBPase,and Aldolase after flowering of the winter wheat variety SN20,and had no significant effect on F287.