盐胁迫下玉米苗期最适鉴定体系及自交系筛选
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1.中国农业科学院作物科学研究所;2.黑龙江八一农垦大学农学院;3.吉林省农业科学院洮南综合试验站

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山东省重点研发计划(2023LZGC010);中国农业科学院科技创新工程项目(CAAS-ZDRW202201)


Optimum Identification System and Inbred Lines Screening of Maize Seedling under Salt Stress
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Key R&D program of Shandong(2023LZGC010);Agricultural Science and Technology Innovation Program of CAAS(CAAS-ZDRW202201)

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    摘要:

    本研究为筛选玉米苗期耐盐鉴定的最适NaCl浓度,选取16份代表性自交系进行0、100、150、200、250、300 mmol/L NaCl处理7天,设置株高、根长、地上部和地下部鲜重、地上部和地下部干重6个指标,并记录苗情。结果表明,150 ~ 200 mmol/L NaCl为适宜范围,150 mmol/L NaCl处理下除根长变异系数外,其他5个指标变异系数均大于200 mM NaCl,据此本研究建立了玉米苗期150 mmol/L NaCl处理下多指标综合评价的耐盐鉴定体系。利用该体系对76份玉米自交系进行分析,通过加权隶属函数法计算耐盐综合评价指数D并聚类分析,将76份玉米自交系划分为高耐盐、耐盐、盐敏感及盐高感4个类群,其中明71、中106、四-287和8112耐盐能力最强,可作为玉米耐盐育种的优异资源;地上部鲜重耐盐系数与D值相关性最高,可作为玉米自交系苗期耐盐性评价的主要指标。

    Abstract:

    To determine the optimal concentration of NaCl for identifying salt tolerance in maize seedlings, 16 representative inbred lines were selected. These lines were treated with NaCl concentrations of 0, 100, 150, 200, 250, and 300 mmol/L for 7 days. Six indicators, including shoot height, root length, shoot and root fresh weight, and shoot and root dry weight, were measured and the seedling conditions were recorded. The results indicated that the appropriate range was between 150-200 mmol/L of NaCl, with variations in the indicators greater than 200 mmol/L except for root length at 150 mmol/L NaCl treatment. Based on these findings, a salt tolerance identification system was established for maize seedlings, which involved evaluating multiple indicators under the optimal NaCl concentration. Using this system, 76 maize inbred lines were analyzed. A comprehensive salt tolerance evaluation index (D) was calculated using the weighted subordinate function method, and the lines were clustered into four groups: high salt tolerance, salt tolerance, salt sensitivity, and high salt susceptibility. Among these, Ming71, Zhong106, Si-287, and 8112 showed the highest salt tolerance, making them valuable resources for breeding salt tolerance in maize. The correlation between the salt tolerance coefficient of shoot fresh weight and the D value was found to be the strongest, suggesting that it can be used as the primary indicator for evaluating salt tolerance in maize inbred lines during the seedling stage.

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  • 收稿日期:2024-02-27
  • 最后修改日期:2024-04-14
  • 录用日期:2024-08-19
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