生物技术通报 ›› 2022, Vol. 38 ›› Issue (4): 174-183.doi: 10.13560/j.cnki.biotech.bull.1985.2021-0843

• 研究报告 • 上一篇    下一篇

大豆耐盐种质的筛选及其耐盐生理特性分析

石广成1(), 杨万明2, 杜维俊1, 王敏1()   

  1. 1.山西农业大学农学院,太谷 030801
    2.晋中学院生物科学与技术学院,榆次 030600
  • 收稿日期:2021-07-06 出版日期:2022-04-26 发布日期:2022-05-06
  • 通讯作者: 王敏,女,博士,副教授,研究方向:大豆遗传与种质创新;E-mail: wangmin3502@126.com
  • 作者简介:石广成,男,硕士研究生,研究方向:大豆遗传与种质创新;E-mail: 2297616181@qq.com
  • 基金资助:
    山西省重点研发一般项目(201703D221004-5);山西省重点研发计划重点(201703D211001);山西省自然科学基金(201801D121247);山西农业大学育种工程项目(YZGC096)

Screening of Salt-tolerant Soybean Germplasm and Physiological Characteristics Analysis of Its Salt Tolerance

SHI Guang-cheng1(), YANG Wan-ming2, DU Wei-jun1, WANG Min1()   

  1. 1. College of Agronomy,Shanxi Agricultural University,Taigu 030801
    2. School of Biological Science and Technology,Jinzhong College,Yuci 030600
  • Received:2021-07-06 Published:2022-04-26 Online:2022-05-06

摘要:

盐害是一种主要的非生物胁迫,严重影响大豆的产量和品质,筛选大豆耐盐种质对耐盐性研究具有重要意义。本研究以332份栽培大豆品种为研究对象,以苗期NaCl致死浓度为评价指标,初步评价其耐盐性。从中选择3份不同耐盐等级的材料为供试材料,公认的耐盐材料Lee68和盐敏材料Jackson为对照材料,用150 mmol/L NaCl溶液处理后,测定表型性状、生理指标及光合指标等,分析不同耐盐种质与这些指标间的关系,进一步探究耐盐生理特性。结果表明:(1)供试种质耐盐性差异较大,筛选出6份敏盐品种和18份耐盐品种。(2)形态性状分析表明不同耐盐等级的品种在盐胁迫下植株干重、株高和根长均下降,其中汾豆105和Lee68的相对干重、相对株高和相对根长较高,晋大70次之,陕西八月黄和Jackson的相对干重、相对株高和相对根长较低。(3)不同组织离子含量分析表明汾豆105、Lee68的根和茎中Na+、Cl-积累较多,叶片中较少,而陕西八月黄和Jackson与其相反。(4)叶片光合特性分析表明盐胁迫下陕西八月黄和Jackson的SPAD均下降,晋大70、Lee68和汾豆105上升;净光合速率均降低,其中汾豆105和Lee68的降幅小,陕西八月黄和Jackson的降幅较大。综合形态和生理指标分析发现5个品种在盐胁迫下的耐盐能力:汾豆105和Lee68>晋大70>陕西八月黄和Jackson,与初筛结果一致,表明致死浓度可作为苗期耐盐性鉴定简便、可靠的指标,同时这些材料为大豆耐盐育种提供了基础材料。

关键词: 大豆, 耐盐性, 苗期, 离子分布, 光合特性

Abstract:

Salt injury is a major abiotic stress,which seriously affects the yield and quality of soybean. Thus it is important to screen soybean salt-tolerant germplasm for the study of salt-tolerance. In this study,332 cultivated soybean varieties were used as the research objects,and their salt tolerance was preliminarily evaluated using the lethal concentration of NaCl at seedling stage as the evaluation index. Three materials with different salt tolerance levels were selected as the experimental materials,and the recognized salt-tolerant material Lee68 and salt-sensitive material Jackson were selected as the control material. After treatment with 150 mmol/L NaCl solution,phenotypes,physiological indexes and photosynthetic indexes were determined to analyze the relationship between different salt tolerant germplasm and these indexes,so as to further explore the salt tolerance mechanism. The results showed that:1)There were great differences in salt tolerance of the germplasm tested. Six salt-sensitive varieties and 18 salt-tolerant varieties were screened out. 2)Morphological analysis showed that the plant dry weight,plant height and root length of the varieties with different salinity tolerance levels all decreased under salt stress. The relative dry weight,plant height and root length of Fendou105 and Lee68 were higher,followed by Jinda70,Shanxibayuehang and Jackson were lower. 3)Analysis of ion content in different tissues showed that the accumulation of Na+and Cl- in the roots and stems of Fendou 105 and Lee68 was higher than that in the leaves,while it was opposite for Shanxibayuehang and Jackson. 4)The photosynthetic characteristics of leaves showed that under salt stress,the SPAD of Shanxibayuehang and Jackson decreased,while that of Jinda70,Lee68 and Fendou105 increased. The net photosynthetic rates of Fendou105 and Lee68 decreased less,while those of Shanxibayuehang and Jackson decreased more. Based on morphological and physiological analysis,the salt tolerance of 5 soybean varieties under salt stress was found to be as Fendou105 and Lee68>Jinda70>Shanxibayuehang and Jackson,which were consistent with the preliminary screening results. The results indicated that the lethal concentration could be used as a simple and reliable indicator for the identification of salt tolerance at seedling stage. Meanwhile,these materials provide basic materials for soybean salt tolerance breeding.

Key words: soybean, salt resistance, seedling stage, ion distribution, the photosynthetic characteristics