Effects of Irrigation Modes on Yield and Chlorophyll Fluorescence Characteristics after Heading Stage of Rice

GUO Xiangping; WANG Fu; WANG Zhenchang; HUANG Shuangshuang; LIU Wei

doi:10.13522/j.cnki.ggps.2017.03.001

Abstract：In order to study the influence of yield and chlorophyll fluorescence characteristics after heading stage under different irrigation modes of rice,took Hybrid rice cultivar "Nan-jing 44" as material,four irrigation mode were set as FSI (frequent and shallow irrigation),WI (wet irrigation),CI (controlled irrigation),RC-CI (raincatching and controlled irrigation),and relationships between chlorophyll fluorescence characteristics of leaf and yield characters were also analyzed.The results showed that chlorophyll content (SPAD value) and fluorescence characteristics (the maximum photochemical eff~ciency (Fv/Fm),the actual photochemical efficiency ofphotosystem Ⅱ (φPSⅡ),the photochemical quenching coefficient (qP) and the non-photochemical quenching coefficient (qN)) had no significant difference under different irrigation modes at heading to flowering stage.Where,SPAD value,Fv/Fm,φPSⅡ,qP could be decreased and qN could be increased with the process of the application time,the decreasing and increasing range presented FSI＞WI＞CI＞RC-CI and RC-CI＞CI＞WI＞FSI,respectively.Compared with FSI,the setting percentage increased by 4.45％,5.59％ and 6.77％ under WI,CI and RC-CI treatment,the thousand seed weight increased by 1.86％,3.49％ and 6.08％ under WI,CI and RC-CI treatment,the grain yield per hole was increased by 8.81％,13.78 and 16.44％ under WI,CI and RC-CI treatment,respectively.Correlation analysis showed that SPAD value,fluorescence characteristics (Fv/Fm,φPSⅡ,qP,qN) of leaf were significant (P＜0.05) or highly significant (P＜0.01) positively correlated with setting percentage,thousand seed weight,grain yield per hole at mike ripening stage and yellow ripening stage of rice.The results indicated that appropriate water management could improve the light energy conversion efficiency,potential activity,open proportion and stability of PS Ⅱ reaction center in later growth stage of rice,which improves the setting percentage and thousand seed weight,which would ultimately result in the increase of yield.