中国生态农业学报（中英文）2024，Vol.32Issue(1)：141-152,12.DOI:10.12357/cjea.20230227
盐胁迫对食用型向日葵现蕾期叶片光合性能与冠层结构的影响
Effects of salt stress on photosynthetic characteristics and canopy structure of edible sunflower leaves at budding stage
摘要
Abstract
To explore the effects of the degree of salt-stress on the photosynthesis of edible sunflowers(hereafter referred to as"ed-ible sunflower")at the budding stage,the photosynthetic characteristics of the leaves and their canopy structures were obtained after three degrees of salt stress classed as lower(LS),medium(MS),and higher(HS)total dissolved solids values(1.00,2.68,and 4.93 g·kg-1,respectively).The results showed that the three salt stress treatments dramatically decreased the net photosynthetic rate(Pn)of the leaves and reduced the number of leaves with high Pn.When compared with that in the LS treatment,the maximum Pn in the MS and HS treatments decreased by 5.09％and 38.69％,respectively.In addition,salt stress reduced the Pn of the top leaves.The maxim-um Pn values of the top leaves in the MS and HS treatments were 8.08％and 14.66％lower than those in the LS treatment,respect-ively.The Pn of all leaves was mainly affected by the synergistic effects of stomatal and non-stomatal factors in the LS treatment,whereas it was mainly affected by non-stomatal factors in the MS and HS treatments.Salt stress also changed the plant type of the ed-ible sunflowers.The canopy structure of LS treatment had a pagoda shape;however,the canopy structures of MS and HS treatments were flat and cylindrical,respectively.Salt stress reduced the total and main functional leaf areas of edible sunflower.Compared with the LS and MS treatments,the total leaf area of the HS treatment decreased by 56.03％and 47.74％,respectively;the maximum single leaf area of the HS treatment also decreased by 38.71％and 49.46％,respectively.Contrarily,the maximum leaf inclination angle of the HS treatment increased by 30.92％and 14.59％compared to those of the LS and MS treatments,respectively.Concludingly,salt stress significantly reduced the photosynthetic performance and leaf area of the main functional leaves of edible sunflowers,causing the canopy structure to change from extended to contracted,thereby inhibiting normal plant growth.关键词
食用型向日葵/盐胁迫/光合速率/冠层结构Key words
Edible sunflower/Salt stress/Photosynthetic rate/Canopy structure分类
农业科技引用本文复制引用
董睿潇,王婧,王永庆,王鑫博,李玉义,王希全,张宏媛,宋佳珅,于茹,逄焕成..盐胁迫对食用型向日葵现蕾期叶片光合性能与冠层结构的影响[J].中国生态农业学报（中英文）,2024,32(1):141-152,12.基金项目
国家重点研发计划项目(2021YFD1901002)、内蒙古自治区科技计划项目(2022YFDZ0067,2021GG0065)和中央级公益性科研院所基本科研业务费专项资金(Y2021YJ20)资助 This study was supported by the National Key Research and Development Program(2021YFD1901002),Inner Mongolia Autonomous Region Sci-ence and Technology Planning Project(2022YFDZ0067,2021GG0065)and the Fundamental Research Funds for Central Non-profit Scientific Institu-tion of China(Y2021YJ20). （2021YFD1901002）
