煙草黑脛病抗性遺傳分析
Genetic Analysis on Tobacco Resistance to Black Shank Disease
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摘要: 選用中煙90(高抗)、革新3 號(高抗),、L8(中抗),、Burley21(中抗)、KBM20(高感),、KY14(高感)等6 個煙草品種作為雜交親本,，按Griffing 雙列雜交的第1 種方法設(shè)計36 個雜交組合。用DPS 數(shù)據(jù)處理系統(tǒng)對煙草黑脛病病情指數(shù)的配合力和遺傳力進(jìn)行了分析,，結(jié)果表明,不同品種,、不同組合間抗病性存在極顯著差異，不同親本抗病性能穩(wěn)定表現(xiàn)出來,。6 個品種間黑脛病的一般配合力和特殊配合力存在極顯著差異,，一般配合力效應(yīng)分析,，中煙90 為第一負(fù)效應(yīng),，KBM20 為第一正效應(yīng)，說明中煙90 在黑脛病抗性育種中有較好的潛力,，KBM20 不利于黑脛病抗性育種,，6 個品種年度間一般配合力表現(xiàn)有一定的差異，主要是在親本Burley21 上,，中煙90,、革新3 號一般配合力表現(xiàn)比較穩(wěn)定，為黑脛病抗性高值親本,，較適宜作為黑脛病抗性親本來源,，Ky14、KBM20 一般配合力表現(xiàn)為低值親本,，不適宜作為抗黑脛病抗性來源的親本,；雜交組合 Burley21和KBM20 特殊配合力較高,，抗性上有進(jìn)一步研究利用價值。煙草黑脛病遺傳以顯性效應(yīng)為主,，加性效應(yīng)也較大,，抗性表達(dá)還受環(huán)境影響。黑脛病抗性遺傳規(guī)律穩(wěn)定,，親本抗性對后代影響較大,，但在早世代進(jìn)行抗性改良效果不好。Abstract: 36 hybrid combinations were obtained based on six tobacco cultivars Zhongyan90 (high resistance), Gexin3 (high resistance), L8 (middle resistance), Burley21 (middle resistance), KBM20 (high susceptibility) and Ky14 (high susceptibility) by the first method of C=P*P of Griffing diallel analysis. The combining ability of resistance to tobacco black shank were analyzed by DPS software. Results showed that there was great significant resistance difference among combinations. The resistance of different parents could be exhibited stably. General combining ability (GCA) and special combining ability (SCA) of resistance to black shank of six cultivars differed significantly. Zhongyan90 and KBM20 respectively showed the first negative and positive effect which indicated that Zhongyan90 could be better than KBM20 in resistance breeding. There was some difference of GCA among six parents. Zhongyan90 and Gexin3 used as high resistance parents could exhibit steady GCA when combined with Burley21. However, Ky14 and KBM20 had low GCAs and were not appropriate parents resistant to black shank. The combination of Burley21 and KBM20 with a high SCA should be further studied. Furthermore, dominant effect was the main part in the heritance of black shank resistance also with large additive effect. Meanwhile, environmental factors will affect resistance expression to some extent. The resistance of parents had one great influence on combinations though there was a stably heritance. As a result, it is not suitable to select objective lines in the early generation.
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