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当前位置: 首页 > 文章 > 不同甜玉米品种苗期耐镉胁迫响应分析 分子植物育种 2022,20 (1) 276-284
Position: Home > Articles > Analysis of Sweet Corn Varieties in Response to Cadmium Stress at Seedling Stage Molecular Plant Breeding 2022,20 (1) 276-284

不同甜玉米品种苗期耐镉胁迫响应分析

作  者：
徐天成;宿惠渊;黄允;陈李金;林思远;高紫微;刘鹏飞;孙伟
单  位：
仲恺农业工程学院农业与生物学院广州市特色作物种质资源研究与利用重点实验室
关键词：
镉胁迫;耐镉指数;品种;幼苗;甜玉米
摘  要：
为筛选耐镉性强的甜玉米品种并探究不同耐受性品种响应镉胁迫的差异,本研究以华南地区主推的12个甜玉米品种为材料,采用沙培的方法研究镉(Cd~(2+))处理对不同甜玉米品种两叶一心时期的苗高、主根长、总根数、鲜重、干重、叶片SPAD值等性状的影响。结果表明,不同遗传背景的甜玉米品种间耐镉性存在较大差异,测量的8个指标的耐镉指数间存在显著相关性。利用主成分分析得到1个综合指标可有效评价不同品种甜玉米的耐镉性,其贡献率为73.42%。采用聚类分析法将12个甜玉米品种分为敏感型(1个品种)、中间型(8个品种)和耐受型(3个品种)。其中,‘仲鲜甜102’、‘珠玉甜1号’和‘佛甜10号’3个品种耐镉性较强,可从中筛选镉低富集型品种运用于农业生产。同时,通过比较分析两个存在镉胁迫响应差异的品种间的表型变异,发现镉胁迫会破坏敏感型甜玉米玉米幼苗叶片中叶绿素的稳定,影响光合作用,进而减少生物量的积累,抑制生长发育。本研究为进一步解析甜玉米耐镉响应机制提供一定的参考。
译  名：
Analysis of Sweet Corn Varieties in Response to Cadmium Stress at Seedling Stage
作  者：
Xu Tiancheng;Su Huiyuan;Huang Yun;Chen Lijin;Lin Siyuan;Gao Ziwei;Liu Pengfei;Sun Wei;Guangzhou Key Laboratory for Research and Development of Crop Germplasm Resources, College of Agriculture and Biology, Zhongkai University of Agriculture and Engineering;
关键词：
Cadmium stress;;Cadmium tolerance index;;Variety;;Seedling;;Sweet corn
摘  要：
In order to screen the sweet corn varieties with strong cadmium tolerance and explore the differences in response to cadmium stress,12 sweet corn varieties mainly selected in South China were used to study the effects of cadmium treatment.The seedling grew in sand culture until they initiated three leaves in total with two leaves expanded and treated with cadmium ion (Cd~(2+)) solution,and then phenotypic investigation of seedling height,main root length,total root number,fresh weight,dry weight,and SPAD value of the first leaf.The results showed that there were significant differences under cadmium tolerance to those sweet corn varieties with different genetic backgrounds,and most of the eight characters measured had significant correlations between cadmium tolerance indices.A comprehensive index obtained by principal component analysis can effectively evaluate the cadmium tolerance of different varieties of sweet corn,and its contribution rate is 73.42%.Cluster analysis was used to classify 12 sweet corn varieties into sensitive (1 variety),intermediate (8 varieties) and tolerant (3 varieties).Among them,three varieties including'Zhongxiantian102','Zhuyutian1'and'Fotian10'had strong cadmium tolerance,which could be further screened for low-cadmium-accumulating varieties to be used in agricultural production.At the same time,by comparing and analyzing the phenotypic variation between two varieties with different responses to cadmium stress,it was found that cadmium stress would break the stability of chlorophyll in the leaves of sensitive sweet corn seedlings,affecting photosynthesis,and then reducing the accumulation of biomass and inhibiting growth and development.This study provides reference for further analysis of cadmium-resistant response mechanism of sweet corn.

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