Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (1): 179-187.DOI: 10.11733/j.issn.1007-0435.2024.01.019

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Comprehensive Evaluation of Low Phosphorus Tolerance and Screening of Representative Evaluation Indexes at Sorghum Seedling

ZHANG Jing-long1,2, SHEN Yi-xin1, LIU Xin-bao1, CHI Ying-jun1   

  1. 1. The College of Agro-grassland Science of Nanjing Agrucultural University, Nanjing, Jiangsu Province 210095, China;
    2. Yunnan Normal University, Kunming, Yunnan Province 650500, China
  • Received:2023-08-01 Revised:2023-09-12 Online:2024-01-15 Published:2024-01-30

高粱苗期耐低磷能力的综合评价及代表性评价指标筛选

张景龙1,2, 沈益新1, 刘信宝1, 迟英俊1   

  1. 1. 南京农业大学草业学院, 江苏 南京 210095;
    2. 云南师范大学, 云南 昆明 650500
  • 通讯作者: 迟英俊,E-mail:yingjunchi@njau.edu.cn
  • 作者简介:张景龙(1988-),女,汉族,河南开封人,博士研究生,主要从事植物响应低磷胁迫的生理与分子机制研究,E-mail:zhangjinglong@ynnu.edu.cn
  • 基金资助:
    中央高校基本科研业务费(KYYJ2022005、XUEKEN2022020);云南省基础研究计划项目(202301AU070161);博士科研启动项目(2021ZB008)资助

Abstract: The uneven distribution of phosphorus resources in China leads to the lack of available phosphorus content in large areas of soil, which limits the growth and yield of crops. Sorghum is an important crop for both food and feed, and the breeding of new sorghum varieties with low phosphorus tolerance has a significant impact on the world food security and the development of animal husbandry. In this study, 29 sorghum varieties were evaluated in the two-year pot experiment. Agronomic characters, biomass and phosphorus efficiency correlation indexes of sorghum accessions were measured, and then the low-P tolerance coefficients of them were calculated. The correlation analysis results showed that there was information overlap in the individual indexes used to evaluate sorghum low phosphorus tolerance. Therefore, the low-P tolerance of sorghum accessions was comprehensively evaluated by principal component analysis, which transformed 11 indexes at seedling stage into 3 independent comprehensive indexes. Based on the membership function value of the comprehensive indexes, we calculated the comprehensive evaluation value of low phosphorus tolerance, and identified the low phosphorus tolerance variety ‘Tianxuan7’ and low phosphorus sensitivity variety ‘Sanxiatiangaoliag02’. Finally, according to the correlation analysis results between various individual indexes and the comprehensive evaluation value, the total fresh weight of shoot was selected as a representative index to assess the low phosphorus tolerance of sorghum.

Key words: Sorghum, Low phosphorus tolerance, Comprehensive evaluation, Representative indexes

摘要: 我国磷资源分布极不均匀,导致大面积土壤有效磷含量不足,限制了农作物的生长及产量。高粱(Sorghum bicolor)是重要的粮饲兼用作物,选育耐低磷高粱品种对保障粮食安全以及农区畜牧业的稳定发展都具有重要意义。本研究以29份高粱品种为试验材料,通过两年盆栽试验,测定高粱的农艺性状、生物量及磷吸收利用等相关指标,计算各个指标的低磷耐性系数。相关性分析结果表明,测定的各单项指标的耐低磷系数反映的信息存在一定程度的重叠。因此,本研究利用主成分分析法计算综合低磷耐性指数,综合评价高粱的低磷耐性,将苗期的11个指标转化为3个独立的综合指标;根据综合指标隶属函数关系,计算出各个品种的综合低磷耐性评价值,鉴定出低磷耐性品种'甜选7'和低磷敏感性品种'三峡甜高粱02';根据各单项指标与综合低磷耐性评价值的相关性分析结果,结合实际操作的可行性与简便性,选定地上部总鲜重作为判断高粱低磷耐性的代表性指标。

关键词: 高粱, 低磷耐性, 综合评价, 代表性指标。

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