中国农业科学 ›› 2019, Vol. 52 ›› Issue (2): 228-238.doi: 10.3864/j.issn.0578-1752.2019.02.004

• 耕作栽培·生理生化·农业信息技术 • 上一篇    下一篇

青稞抗倒伏性状的基因型差异

白羿雄,姚晓华,姚有华,吴昆仑()   

  1. 青海大学农林科学院(青海省农林科学院)/青海省青稞遗传育种重点实验室/国家麦类改良中心青海青稞分中心,西宁 810016
  • 收稿日期:2018-07-16 接受日期:2018-09-18 出版日期:2019-01-16 发布日期:2019-01-21
  • 通讯作者: 吴昆仑 E-mail:wklqaaf@163.com
  • 作者简介:白羿雄,E-mail: yixiongbai@163.com
  • 基金资助:
    国家现代农业产业技术体系(CAS-05);青海省农林科学院创新基金重大专项(2017-NKY-01);青海大学中青年科研基金(2017-QNY-2);西藏自治区重大科技专项(XZ201801NA01-014);青海省科技支撑项目(2015-NK-114)

Difference of Traits Relating to Lodging Resistance in Hulless Barley Genotypes

BAI YiXiong,YAO XiaoHua,YAO YouHua,WU KunLun()   

  1. Academy of Agriculture and Forestry of Qinghai University (Qinghai Academy of Agriculture and Forestry Sciences)/ Qinghai Provincial Key Laboratory of Hulless Barley Genetics and Breeding/Qinghai Hulless Barley Sub-Center of National Triticeae Improvement Center, Xining 810016
  • Received:2018-07-16 Accepted:2018-09-18 Online:2019-01-16 Published:2019-01-21
  • Contact: KunLun WU E-mail:wklqaaf@163.com

摘要:

【目的】 倒伏是影响青稞生产和产量的主要原因之一。筛选与青稞抗倒伏性密切相关的性状并构建抗倒伏评价体系,是开展青稞抗倒伏品种选育的重要理论依据。【方法】 通过对35份青稞种质资源根系、茎秆和穗部23个农艺性状进行方差分析,明确不同基因型间各性状的差异性。采用相关分析筛选出与青稞抗倒伏性密切相关的指标,并通过主成分分析和线性回归分析构建完成青稞抗倒伏评价体系。【结果】 不同基因型青稞材料在同一性状间表现出较大差异,且农艺性状在基因型间的差异均极显著,农艺性状中倒伏率的遗传变异最丰富;同一参试材料的农艺性状在两个生态区间差异较大,海北高寒生态区试点各基因型的遗传变异较丰富;各性状的基因型与环境因素间存在显著互作效应(P<0.05)。相关分析结果表明茎秆强度同青稞抗倒伏性关系最为密切,并通过抗倒伏指标构建青稞抗倒伏评价体系。青稞分蘖数过多、第三和第四茎节过长易引起植株倒伏。根干重大、茎秆重、茎秆壁厚、茎秆强度大是植株固持能力强、抗倒伏伏性优异的原因。【结论】 分蘖数、穗重、茎长、茎重、茎秆强度适合作为青稞抗倒伏性评价指标,验证结果表明抗倒伏评价体系较可靠,可用于青稞种质的抗倒伏性评价。

关键词: 青稞, 倒伏, 主成分分析, 茎秆强度, 评价体系

Abstract:

【Objective】 Lodging has become one of the main factors affecting the production and yield of hulless barley. Screening the traits closely related to the lodging resistance and constructing the lodging resistance evaluation system is an important theoretical basis for the breeding of hulless barley varieties. 【Method】 23 agronomic traits in roots, stems, and ears related to the lodging of 35 hulless barley germplasms were analyzed by statistical method. The variance analysis was carried out to identify the differences among different traits, and correlation analysis was used to screen out the traits which closely related to the lodging resistance. The indexes were finally constructed by principal component analysis and linear stepwise regression analysis to construct a hulless barley resistance evaluation system. 【Result】 The results showed that different genotypes of barley cultivars had larger differences among the same traits, and the differences of genotypes among the phenotypic traits were extremely significant, among this, the genetic variation of lodging rate was the most abundant. The agronomic traits of the same genotypes were greatly affected between different ecoregion, and the genetic variation of the genotypes in Haibei alpine farming-pastoral ecotone was abundant. There were significant interaction effects between genotypes of various traits and environmental factors (P<0.05). Correlation analysis showed that the stem strength was most closely related to the lodging resistance of the hulless barley, which was used lodging resistance index to construct the lodging resistance evaluation system. When the plant had more tiller numbers, longer third and fourth stem segments, which caused the lodging, and made the number of grains reduced, and the ear weight became lighter. When the root dry weight was heavier, the stem was heavier, the wall thickness was thicker, and the stem strength was larger, which made the plants have the stronger ability to retain and lodging resistance. 【Conclusion】 Based on tiller numbers, ear weight, stem length, stem weight and stem strength, a comprehensive evaluation system for the resistance indexes of barley was constructed. The results showed that the system was reliable and could be used for the evaluation of lodging resistance of hulless barley germplasms.

Key words: hulless barley, lodging, principal component analysis, stem strength, evaluation system