草业学报2024，Vol.33Issue(11)：161-171,11.DOI:10.11686/cyxb2024065
38份饲用燕麦品种苗期磷利用效率综合评价
A multi-trait evaluation of phosphorus efficiency of 38 forage oat cultivars at the seedling stage
摘要
Abstract
This research investigated the response of forage oats to low phosphorus levels to identify phosphorus-efficient cultivars.A study was conducted on 38 forage oat varieties at the seedling stage,and 15 traits were measured and analyzed,including morphological and root traits,under low phosphorus(0.02 mmol·L-1 KH2PO4,LP)and normal phosphorus(1 mmol·L-1 KH2PO4,NP)treatments,using a hydroponic system.Phosphorus efficiency types were determined using principal component analysis,correlation analysis,multiple regression analysis,membership function analysis and cluster analysis.The results indicated that under low phosphorus stress,certain traits like root:shoot ratio,total root length,root tip number,and phosphorus use efficiency increased significantly(P<0.05),while plant height,shoot dry weight,root dry weight,total dry weight,root diameter,phosphorus content,and phosphorus accumulation decreased significantly(P<0.05).Under the low-phosphorus treatment,the coefficients of variation of the root-related indexes including the number of root tips,root forks,and root∶shoot ratio were all higher than in the normal phosphorus treatment,which were 49.24%,55.24%and 46.11%,respectively.A correlation analysis was carried out between the integrated low phosphorus tolerance value(D)and the low phosphorus stress tolerance indices for the 15 traits using membership function analysis,and the low phosphorus tolerance coefficients of shoot dry weight,root dry weight,total dry weight,total root length,root surface area,root volume,root projected area,root tip,root fork,and phosphorus use efficiency showed a significant correlation with the D value.Using multiple regression analysis,seven indicators for the identification of low phosphorus tolerance were evaluated,and a regression equation for the D value was established.Finally,the cluster analysis divided the 38 forage oats into three categories:high-,medium-,and low-efficiency of phosphorus utilization.Of the tested varieties,three were phosphorus-efficient,namely Youmu No.1,Kona and Sweet oat No.1.关键词
饲用燕麦/低磷胁迫/磷效率/根系Key words
forage oat/low phosphorus stress/phosphorus efficiency/root system引用本文复制引用
余静菠,张慧丽,李进,关皓,周青平,陈仕勇..38份饲用燕麦品种苗期磷利用效率综合评价[J].草业学报,2024,33(11):161-171,11.基金项目
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)和西南民族大学中央高校基本科研业务费专项资金(ZYN2023012)资助. （2021YFYZ0013）
