The Effects Of Plant Growth Regulators On Chlorophyll Fluorescence And Root Growth Of Neem And Tuber

In order to solve the problem of low survival rate of seedlings in the process of transplanting,three plant growth regulators(NAA,IAA,and abt-3)with different concentrations(50mg/L,100mg/L,and 150mg/L)were applied to root irrigation treatment of Evodia glabrifolia and Elaeocarpus sylvestris Determination of chlorophyll fluorescence(PSII actual quantum yield(Y(II)),relative electron transfer efficiency(ETR),non photochemical quenching coefficient(NPQ),root activity,root morphology index(root length,root surface area,root volume,root average diameter),to study the effects of plant growth regulators on the physiology of Evodia glabrifolia and Elaeocarpus sylvestris.The method of principal component analysis was used to comprehensively evaluate different treatments,and the best plant growth regulator species and the corresponding concentration were screened out,so as to improve the transplant survival rate of these two species and provide technical support for their application in landscaping.The main research results were as follows:(1)ABT-3 and NAA can promote the actual photoenergy conversion efficiency of fructus chinensis at all treatment concentrations,while the plant growth regulator at low concentration can significantly promote the photoprotection ability of the body of Evodia glabrifolia.There was a significant positive correlation between YII and ETR.NAA and ABT-3 were superior to IAA in promoting root activity,while IAA and ABT-3 were superior to NAA in promoting root length,root surface area and average root diameter.The effect of NAA on the utilization of light energy and the growth of root system was not as good as that of IAA and ABT-3.The comprehensive sequence showed that 50mg/L IAA was the best treatment,which could significantly increase the root growth of Evodia glabrifolia,especially promote the reduction strength of roots,and promote the utilization and protection of light energy,and promote the growth and development of Evodia glabrifolia.(2)The application of three plant growth regulators at three concentrations all promoted the photoprotection ability of Elaeocarpus sylvestris,but only ABT-3 at 50mg/L and IAA at 50mg/L and 100mg/L promoted the photoprotection ability of Elaeocarpus sylvestris.NAA had a better effect on the photoprotection ability,while IAA had a better effect on the photoprotection ability.In terms of root indexes,the results were consistent with those of Evodia glabrifolia,and all 3 concentrations of the 3 plant growth regulators could promote the increase of root vitality.On the contrary,IAA was significantly superior to NAA in promoting root vitality.The effects of IAA and ABT-3 on root length,root surface area,root volume and average root diameter were better than NAA,and the effects of IAA and ABT-3 on root length,root surface area,root volume and average root diameter were better than NAA.The effect of plant growth regulators on the root growth was mainly the lateral growth of root system,but the longitudinal thickening effect was not obvious.Comprehensive sequencing showed that 50 mg/L of IAA was the best treatment,can significantly increase the root growth,especially the intensity of root,root length,root surface area,root volume,has a good promoting effect,and can promote mountain blueberry tree’s ability to use light and light protection ability,promoting plant growth and development.To sum up,50mg/L IAA was the best treatment to promote the growth of seedlings of Evodia glabrifolia and Elaeocarpus sylvestris,which can promote the utilization of light energy and the growth of root system of Evodia glabrifolia and Elaeocarpus sylvestris.To some extent,it can improve the survival rate and promote its application in landscaping.