花生栽培种与野生种(Arachis oteroi)人工杂交双二倍体的创制和鉴定

花生野生种是改良花生栽培种的重要基因资源。为了利用野生花生的抗性基因,本研究利用花生栽培品种豫花9331与二倍体野生种A.oteroi人工杂交,借助胚拯救和染色体秋水仙素加倍,创制一个双二倍体杂种Am E-4,并利用荧光原位杂交和分子标记技术准确鉴定了该双二倍体。观察结果表明,Am E-4的叶片与豫花9331存在显著差异,而主茎高、侧枝长和总分枝数等性状与豫花9331差异不显著。Am E-4开花期较豫花9331推迟60 d,结实性与荚果发育状况较差,不利于Am E-4的育种利用。同时,开发了57个追踪Am E-4中A.oteroi染色体的显性或共显性SSR标记,为创制和鉴定花生栽培种A.oteroi易位系或渐渗系奠定分子基础。

Development and Characterization of Amphidiploid Derived from Interspecific Cross between Cultivated Peanut and Its Wild Relative Arachis oteroi

Wild Arachis species are important genetic resources. To introgress resistant genes of Arachis species, developed a new amphidiploid AmE-4 through man-made cross between cultivated peanut variety Yuhua 9331 and a diploid Arachis species A. oteroi, with the assistance of following embryo rescue and chromosome doubling by colchicine treatment. AmE-4 was identified and characterized by fluorescence in situ hybridization (FISH) and SSR molecular marker. Morphological observation revealed significant differences in leaves between amphidiploid AmE-4 and Yuhua 9331, while the agronomic traits such as main stem height, length of first lateral branch and number of branches showed less difference between them. The date of first flower appearance in AmE-4 delayed sixty days compared with that in Yuhua 9331, and its pods setting and development were also poor, which would hinder its further utilization. In addition, 57 dominant or co-dominant SSR molecular markers were developed and could be used to identify translocation or introgression lines with A. oteroi chromosome fragment in future studies.