6个饲用燕麦品种苗期对低磷胁迫的响应及耐低磷评价  

Response of seedling growth and root morphology of six forage oat varieties to low phosphorus stress and evaluation of low phosphorus tolerance

作　　者：张昌兵[1] 唐梅玲 周洋 张慧丽 余静菠 陈仕勇 ZHANG Changbing;TANG Meiling;ZHOU Yang;ZHANG Huili;YU Jingbo;CHEN Shiyong(Sichuan Academy of Grassland Sciences,Chengdu 611731,China;Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station,Southwest Minzu University,Chengdu 610041,China;School of Animal and Veterinary Sciences,Southwest Minzu University,Chengdu 610041,China)

机构地区：[1]四川省草原科学研究院,四川成都611731 [2]四川若尔盖高寒湿地生态系统国家野外科学观测研究站,四川成都610041 [3]西南民族大学畜牧兽医学院,四川成都610041

出　　处：《西南民族大学学报(自然科学版)》2025年第1期1-7,共7页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：国家重点研发计划课题(2017YFC0504806);四川省“十四五”饲草育种攻关项目(2021YFYZ0013);四川省农业科技成果转化项目(2023NZZJ0002)。

摘　　要：为了探讨不同燕麦品种苗期对低磷胁迫的响应,筛选出耐低磷能力强的品种,选用6个燕麦品种,采用水培试验,对常量磷(1 mmol·L^(-1))和低磷胁迫(0.02 mmol·L^(-1))下燕麦苗期形态及根系性状进行测定.研究结果表明:在低磷胁迫下,各燕麦品种株高、茎粗、叶长、叶宽大都显著下降(P<0.05);除青引1号外,供试品种的总根长、根系表面积大都显著增加(P<0.05),根体积、根直径及根系活力大都显著下降(P<0.05);供试品种的地上干重和植株总干重都呈现不同程度的下降;根冠比除太阳神外都显著增加(P<0.05);根系的干重各品种间则表现出不同的反应,其中青海444和牧王在低磷下显著增加(P<0.05),青引2号和骏马则显著下降(P<0.05).采用综合耐低磷系数评价6种燕麦品种的耐低磷能力依次为:太阳神>骏马>青引2号>牧王>青海444>青引1号.To investigate the seedling response of various oat varieties to low phosphorus stress and to identify those with high tolerance to such conditions,six oat varieties were selected for this experiment.Hydroponic tests were employed to assess the seedling morphology and root traits of oats under normal phosphorus(1 mmol·L^(-1))and low phosphorus stress(0.02 mmol·L^(-1)).The results indicated that plant height,stem thickness,leaf length,and leaf width significantly decreased(P<0.05)under low phosphorus stress.Conversely,total root length and root surface area increased significantly(P<0.05),while root volume,root diameter,and root vigor decreased significantly(P<0.05)in most test varieties,with the exception of Qingyin No.1.Above-ground dry weight and total plant dry weight exhibited varying degrees of decrease,while the root-crown ratio significantly increased(P<0.05)except for the Titan oat.The dry weight of the root system displayed different responses among the varieties;specifically,Qinghai 444 and Haymaker showed significant increases(P<0.05)under low phosphorus conditions,whereas Qingyin No.2 and Cayuse experienced significant decreases(P<0.05).The integrated low phosphorus tolerance coefficient was utilized to evaluate the low phosphorus tolerance of the six oat varieties,revealing the following order of tolerance:Titan>Cayuse>Qingyin No.2>Haymaker>Qinghai 444>Qingyin No.1.

关 键 词：饲用燕麦 低磷胁迫 根系形态 主成分分析 

分 类 号：S543.7[农业科学—作物学]