摘要
利用多个生化标记系统对一个抗小麦黄矮病新种质（ＨＧ２９５）进行了分析鉴定。胚乳水溶蛋白等电聚焦表明，在ｐＨ８．０－１０．２范围内，中５有３条在其小麦亲本南大２４１９、克强中均不存在的特异带，其中只有第２条在ＨＧ２９５中得到表达。在ＨＧ２９５中，２ＤＳ控制的那条水溶蛋白带发生了缺失。ＨＧ２９５中２ＤＳ的缺失在Ｐｅｒ－５与Ｅｓｔ－６电泳分析中进一步得到确证。Ｅｓｔ－７酶谱表明，中５与ＨＧ２９５均表达１条来源于中间偃麦草［Ｔｈｉｎｏｐｙｒｕｍｉｎｔｅｒｍｅｄｉｕｍ（Ｈｏｓｔ）ＢａｒｋｗｏｒｔｈａｎｄＤｅｗｅｙｏｒＡｇｒｏｐｙｒｕｍｉｎｔｅｒｍｅｄｉｕｍ（Ｈｏｓｔ）Ｂｅａｕｖ］的特异带，在ＨＧ２９５中可能发生２ＤＬ的缺失。过氧化物的歧化酶分析表明，在ＨＧ２９５中确实发生了２ＤＬ的缺失，并且与中５一样表达１条可能来源于中间偃麦草的特异带。各种结果都表明ＨＧ２９５是一个２Ｅ（Ｘ）／２Ｄ双体异代换系。
Several biochemical marker systems were used to characterize a BYDV resistant wheat germplasm, HG295. IEF phenotype of water soluble protein from endosperm indicated that Zhong 5 expressed three novel bands in the pH range 8.0-10.2, the second of them was also expressed in HG295. Moreover, the 2DS WSP band was missing in HG295. The absence of 2DS in HG295 was also confirmed by Per-5 and Est-6 analysis. The phenotype of Est-7 indicated that the 2DL was possibly missingin HG295. The absence of 2DL was further confirmed by Superoxide dismutase (SOD-1) phenotype of HG295, Moreover, both Zhong 5 and HG295 expressed a novel SOD-1 band other than their wheat background. Various results provided convincing evidences that HG295 is a 2E (X)/2D substitution line.
