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草业学报 ›› 2024, Vol. 33 ›› Issue (11): 161-171.DOI: 10.11686/cyxb2024065

• 研究论文 • 上一篇    

38份饲用燕麦品种苗期磷利用效率综合评价

余静菠(), 张慧丽, 李进, 关皓, 周青平, 陈仕勇()   

  1. 西南民族大学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
  • 收稿日期:2024-02-27 修回日期:2024-04-08 出版日期:2024-11-20 发布日期:2024-09-09
  • 通讯作者: 陈仕勇
  • 作者简介:E-mail: chengshi8827@163.com
    余静菠(1999-),男,藏族,四川汶川人,在读硕士。E-mail: swunyujingbo@163.com
  • 基金资助:
    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);西南民族大学中央高校基本科研业务费专项资金(ZYN2023012)

A multi-trait evaluation of phosphorus efficiency of 38 forage oat cultivars at the seedling stage

Jing-bo YU(), Hui-li ZHANG, Jin LI, Hao GUAN, Qing-ping ZHOU, Shi-yong CHEN()   

  1. Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station,Southwest Minzu University,Chengdu 610041,China
  • Received:2024-02-27 Revised:2024-04-08 Online:2024-11-20 Published:2024-09-09
  • Contact: Shi-yong CHEN

摘要:

为探讨饲用燕麦在低磷环境下的变化及响应机制,筛选出磷高效饲用燕麦品种,以38份饲用燕麦品种为材料,采用水培法,在低磷(0.02 mmol·L-1 KH2PO4, LP)和正常磷(1 mmol·L-1 KH2PO4, NP)处理下,测定和分析供试燕麦品种苗期形态、根系等相关的15个指标。通过主成分分析、相关性分析、回归分析,结合隶属函数法和聚类分析,综合评价各燕麦品种的磷效率类型。结果表明,在低磷胁迫下,根冠比、总根长、根尖数、磷素利用效率均值显著升高(P<0.05);株高、地上部干重、地下部干重、生物量、根直径、磷含量和磷累积量显著下降(P<0.05)。低磷胁迫下,根尖数、根分叉数、根冠比等根系相关指标的变异系数较高,分别为49.24%、55.24%、46.11%。通过隶属函数法计算耐低磷综合评价值(D),将其与15个指标的耐低磷系数进行相关性分析,其中地上部干重、地下部干重、生物量、总根长、根表面积、根体积、根投影面积、根尖数、根分叉数、磷素利用效率的耐低磷系数与综合评价值D值之间呈显著相关关系。结合相关分析和多元回归分析,筛选了7个耐低磷鉴定指标,建立了耐低磷综合评价值D值回归方程。聚类结果将38份燕麦划分为磷高效型、磷中效型、磷低效型3类,其中优牧1号、科纳、甜燕1号饲用燕麦为磷高效型。

关键词: 饲用燕麦, 低磷胁迫, 磷效率, 根系

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.

Key words: forage oat, low phosphorus stress, phosphorus efficiency, root system