Effects of water regulation on the growth,development and photosynthetic characteristics of Italian Riesling
[Objective]The Hexi Corridor is one of the most favorable areas for the production of wine grapes.Drought is the main factor affecting the production of wine grape in this area.In order to improve the quality of raw material production of wine grape in this area,it is very important to study the rational water management mode.[Method]Six-year-old Guinness grapevines were used as test material and were placed at 45～117 d after flowering for T1(soil moisture content accounts for 45%～50%of field moisture capacity),T2(soil moisture content accounts for 55%～60%of field moisture capacity),T3(soil moisture content accounts for 75%～80%of field moisture capacity)and CK(soil moisture content accounts for 65%～70%of field moisture capacity).Leaf area,branch third internode length,new shoot base thickness,leaf fluorescence parameters(Fv/Fm,ETR,Fo,qP,qN),leaf photosynthetic parameters(Pn,Gs,Tr,Ci)and fruit quality indexes of Gurenxiang grape were determined.[Result]High level of irrigation(T3)signifi-cantly promoted the growth of increased leaf area,branch internodes and thickness at the base of new shoots,and reduced leaf SPAD values,leaf PS II maximum photochemical efficiency(Fv/Fm),electron trans-fer rate(ETR),leaf transpiration rate(Tr)and intercellular CO2 concentration(Ci),and increased leaf initial fluorescence(Fo).Compared with CK,heavy water stress(T1)inhibited the increase in leaf area,suppressed the growth of internode length and basal thickness of grapevine plants,significantly reduced leaf Fv/Fm,ETR,photochemical quenching coefficient(qP),and non-photochemical quenching coefficient(qN),and de-creased Fo,leaf net photosynthetic rate(Pn)and leaf stomatal conductance(Gs).The values of leaf fluores-cence parameters Fv/Fm,ETR,qP and qN were higher under mild stress(T2)than under CK;the initial fluo-rescence values of leaves were higher than under CK.In addition,each water stress treatment reduced Pn,Gs,Tr and Ci to different extents.Mild water stress(T2)can significantly improve the fruit quality of Gui-renxiang grape.[Conclusion]Mild water stress(T2)can improve the photocontracting efficiency of leaves and the fruit quality of Guirenxiang grapes to a certain extent,whereas severe water stress(T1)can hinder the normal growth and development of grape leaves and fruit quality.Therefore,a certain degree of water stress is veneficial for grape growth and fruit development.
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