烟草根系柠檬酸分泌特性的遗传规律分析

目的]改善烟草根系对土壤钾的活化能力,提高对钾的吸收效率。方法]以农大202、中烟101、NC628、K358、NX232共5个烟草品种为亲本,采用双列杂交试验研究了烟草根系柠檬酸分泌特性的遗传规律。结果]不同品种间烟草根系柠檬酸分泌特性存在显著差异。在柠檬酸分泌特性上,农大202的一般配合力效应值和农大202×NC628特殊配合力效应值均为正,对改善后代钾吸收效率有较高的利用价值。烟草根系柠檬分泌酸特性的遗传规律符合"加性-显性"遗传模型。缺钾敏感性不符合"加性-显性"遗传模型。结论]该研究为进一步研究烟草根系柠檬酸分泌特性奠定了理论基础。

Genetic Regular Pattern Analysis on Citric Acid Secretion Characteristics in Tobacco Root

Objective] To improve the activation of tobacco root on soil potassium,and to enhance the absorption efficiency on potassium.Method] With Nongda 202,Zhongyan 101,NC628,K358,NX232 as the parents,diallel crossing test was used to study genetic regularity of citric acid secretion characteristics in tobacco root.Result]There were significant differences in citric acid secretion characteristic between different cultivars.General combining ability (GCA) values of Nongda 202 and specific combining ability (SCA) values of Nongda 202 × NC628 were positive in citric acid secretion characteristics,and the results had high use value to improve the offspring potassium uptake efficiency.Genetic regularity of citric acid secretion characteristic in tobacco root accorded with "additive-dominant" genetic model,but sensitivity to potassium deficiency did not accord with "additive-dominant" genetic model.Conclusion] This research lays theoretical basis for the further research on citric acid secretion characteristics of tobacco root..