荞麦基因型间的耐铅性研究

Research on Pb^(2+) Tolerance of Different Buckwheat Genotypes

[目的]筛选出耐铅性较强的荞麦资源。[方法]用水培法对19份荞麦资源的耐铅性进行研究。以发芽的荞麦种子在3 d内的根伸长量及根系活力衡量荞麦耐铅性的程度。[结果]低浓度的Pb2+处理能促进T352、L2081、T308、T442、T393根系生长量和根系活力增加,但根系生长量和根系活力均随Pb2+处理浓度的进一步增加而下降,说明上述荞麦材料抗铅胁迫能力较强。不同地区之间荞麦材料的耐铅能力存在差异,以威宁地区材料的耐铅能力较强。[结论]荞麦基因型间的耐铅胁迫能力存在差异,以原产于威宁地区的荞麦材料T352、T308、T442、T393耐铅能力较强,值得在荞麦耐铅性育种和耐铅机制研究中开发利用。

[Objective] The research aimed to select the buckwheat accessions with higher Pb2＋ tolerance.[Method] Using 19 buckwheat accessions as materials,the Pb2＋ tolerance were studied by means of solution culture method.The length of root and the activity of root were used to evaluate the degree of Pb2＋ tolerance.[Result] Root growth and activity of root of T352,L2081,T308 and T393 were promoted under the low concentration of Pb2＋.However,with the concentration of Pb2＋ increasing,their root growth and activity decreased,indicating that these genotypes have the higher Pb2＋ tolerance.There were great variations of Pb2＋ tolerance of buckwheat in different areas.[Conclusion] There are different Pb2＋ tolerance in buckwheat,T352,T308,T442 and T393 which were originated from Weining had much higher Pb2＋ tolerance than the others,which can be used for researching on the buckwheat breeding and the mechanism of the buckwheat Pb2＋ tolerance.