盐胁迫与供磷水平对柳枝稷苗期光合特性与总生物量的影响  

Effects of Salt Stress and Phosphorus Supply on Photosynthetic Characteristics and Total Biomass of Switchgrass at Seedling Stage

作　　者：麻仲花 陈娟 吴娜[1] 满本菊 王晓港 者永清 刘吉利[2] MA Zhonghua;CHEN Juan;WU Na;MAN Benju;WANG Xiaogang;ZHE Yongqing;LIU Jili(College of Agriculture,Ningxia University,Yinchuan 750021,China;College of Ecological Environment,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学农学院,银川750021 [2]宁夏大学生态环境学院,银川750021

出　　处：《中国农业科技导报》2023年第6期190-200,共11页Journal of Agricultural Science and Technology

基　　金：宁夏自然科学基金项目(2022AAC03062);国家自然科学基金项目(31860344)。

摘　　要：为探究盐胁迫与供磷水平对不同柳枝稷(Panicum virgatum L.)品种苗期光合特性及总生物量的影响,以八倍体Alamo、Alamo和Pathfinder 3个品种作为水培试验材料,设置2个盐胁迫水平(A1非盐胁迫、A2盐胁迫)和4个供磷水平(B1无磷,B2低磷,B3高磷,B4全磷),分析盐胁迫与供磷水平对3个柳枝稷品种苗期光合指标及总生物量的影响规律,并进一步探究3个柳枝稷品种光合特性与总生物量之间的关系。结果表明,在相同盐处理下,3个柳枝稷品种苗期的净光合速率、气孔导度、蒸腾速率、叶绿素含量及总生物量均随着磷水平的增加而增加,其中,在非盐胁迫和盐胁迫下八倍体Alamo,全磷处理较无磷处理分别提高21.84%、42.86%、21.98%、17.45%、246.52%和14.63%、16.67%、71.10%、115.45%、91.00%;Alamo分别提高15.89%、28.57%、37.62%、95.16%、115.32%和15.28%、100.00%、37.20%、188.33%、113.97%;Pathfinder分别提高18.33%、75.00%、42.60%、86.87%、145.85%和23.35%、100.00%、50.35%、108.20%、405.88%。在相同盐处理下,3个柳枝稷品种苗期的胞间CO_(2)浓度随着磷水平的增加而降低,其中,在盐胁迫下全磷处理较无磷处理分别降低49.68%、40.41%、40.21%;在非盐胁迫下全磷处理较无磷处理分别降低50.12%、68.07%、63.11%。八倍体Alamo总生物量的增加与蒸腾速率、气孔导度、净光合速率呈正相关;Alamo总生物量与叶绿素含量呈正相关;八倍体Alamo和Alamo的总生物量增加均与胞间CO_(2)浓度呈负相关。综合分析表明,八倍体Alamo的适应性较好,更适宜在盐胁迫与低磷胁迫环境下种植。To explore the effects of salt stress and phosphorus supply level on photosynthetic characteristics and total biomass of different switchgrass(Panicum virgatum L.)varieties at seedling stage,octoploid Alamo,Alamo and Pathfinder were used as hydroponic materials,and 2 salt stress levels(A1 non-salt stress,A2 salt stress)and 4 phosphorus supply levels(B1 no phosphorus,B2 low phosphorus,B3 high phosphorus,B4 total phosphorus)were set.The effects of salt stress and phosphorus supply levels on different photosynthetic indexes and total biomass of 3 switchgrass varieties at seedling stage were analyzed,and the photosynthetic characteristics and characteristics of 3 switchgrass varieties were further revealed.Under the same salt treatment,the net photosynthetic rate,stomatal conductance,transpiration rate,chlorophyll content and total biomass of 3 switchgrass varieties at seedling stage all increased with the increase of phosphorus level.Compared with non-phosphorus treatment,the net photosynthetic rate,stomatal conductance,transpiration rate,chlorophyll content,total biomass of octoploid Alamo in total phosphorus treatment under non-salt stress and salt stress increased by 21.84%,42.86%,21.98%,17.45%,246.52%and 14.63%,16.67%,71.10%,115.45%,91.00%,respectively;Alamo increased by 15.89%,28.57%,37.62%,95.16%,115.32%and 15.28%,100.00%,37.20%,188.33%,113.97%,respectively;Pathfinder increased by 18.33%,75.00%,42.60%,86.87%,145.85%and 23.35%,100.00%,50.35%,108.20%,405.88%,respectively.Under the same salt treatment,the intercellular CO_(2)concentrations of 3 switchgrass varieties at seedling stage decreased with the increase of phosphorus level,which decreased by 49.68%,40.41%,40.21%and 50.12%,68.07%,63.11%in total phosphorus treatment under salt stress and non-salt stress compared with no phosphorus treatment.The correlation analysis indicated that the total biomass was positively correlated with transpiration rate,stomatal conductance and net photosynthetic rate in octoploid Alamo,and the total biomass was closely positively

关 键 词：盐胁迫 供磷水平 光合特性 相关性分析 隶属函数分析 

分 类 号：S516[农业科学—作物学]