关键词: 菊花, 属间杂种, 杂交, 回交, 耐盐性

Abstract: In allied genera of chrysanthemum，many wild species possess elite attributes such as resistance to to disease，insect，virus and environment，Crossostephium chinense（L.）Makino is one of them. It is mostly found in the coastal forest，mainly distributed in the cracks of bed rock，and possesses high salt tolerance. But it is usually difficult to obtain hybrids between these allied genera species and chrysanthemum cultivars. Bridge parent is an effective way to overcome distant hybridization and transfer useful genetic variation to elite germplasm. Here，three intergeneric hybrids，[Chrysanthemum nankingense（Hand.-Mazz.）Y. R. Ling × Tanacetum vulgare L.]F1（short for JJ），[Chrysanthemum crassum（Kitam.）Kitam. × Ajania myriantha（Franchet）Ling ex Shih] F1（short for DD），[Chrysanthemum crassum（Kitam.）Kitam. × Crossostephium chinense（L.）Makino] F1（short for DF），as bridge parent，were hybrided with chrysanthemum to study the possibility of transfer useful genetic variation to chrysanthemumcultivars and innovate chrysanthemum germplasm. The main results showed that：No seed was obtained between C. morifolium‘Xiumandaihua’，‘6045-7’and JJ. The seed set of cross and backcross between C. morifolium‘Maoyan’and DD was very low，only one cross hybrid and three single backcross hybrids using C. morifolium‘Maoyan’as paternal parent were obtained. The seed set of cross between C. morifolium‘T1012’，‘Han 2’（both female parent）and DF was comparatively higher，and single backcross hybrids using C. morifolium‘T1012’as paternal parent were successfully obtained. The cross hybrids and backcross hybrids differentiated obviously from their parents in many morphological characters and chromosome number and salt tolerance，and there existed transgressive individuals and aneuploids. The results of salt tolerance identification showed that using intergenneric hybrids as bridge parent can successfully introduce the salt tolerance of A. myriantha and Cr. chinense into chrysanthemum cultivars，and improve its salt tolerance.

Key words: chrysanthemum, intergeneric hybrids, cross, backcross, salt tolerance