關鍵詞：inheritance pythium helicoides resistance rose 

摘要：Rose root rot disease caused by Pythium helicoides Drechsler has brought heavy damage to cut rose production in Japan,and it has became apparent that Rosa multiflora showed resistance to this disease.Roses have been bred by interspecies crossing with Rosa species including of R.multiflora,and many progenies of R.multiflora have been bred as determined cluster-flowered roses.However,the genetic architecture of this resistance remains.So,in this study,four kinds of R.multiflora and 21 rose cultivars that have been clarified in the cross-fertilization genealogy with R.multiflora were used as plant materials,and the inheritability of resistance to root rot disease was investigated.Four kinds of R.multiflora had all high resistance,and the resistance to root rot disease in R.multiflora was inherent characteristic of species.Five varieties not less than 50% in relatedness with R.multiflora were shown as varied ‘resistant’ and ‘moderately resistant’.Therefore,the inherent resistant characteristic in R.multiflora was not controlled by single major gene,and the resistibility in R.multiflora was not cytoplasmic but nuclear heredity.Although there was significant negative relation between relative root rot severity and relatedness with R.multiflora,the variance of relative root rot severity had tendency to expand as relatedness with R.multiflora reduced.This result,therefore,indicated that the contingency of resistance expression increased as the relatedness with R.multiflora was reduced.The varieties having low degree of relatedness with R.multiflora had similar relative root rot severity with R.multiflora.These results indicated that we would be able to select resistant roses from progenies crossed with R.multiflora.

生物技術雜志要求:

{1}借喻詞一般需用“”號；課題名用“”號，不用“《》”。

{2}來稿一般在1個月內提出處理意見，請不要一稿兩投，若1個月后仍未收到稿件處理通知，作者有權自行處理來稿。

{3}參考文獻著錄采用數字加方括號編序集中列于文后，其著錄格式如下：序號、主要作者、文獻及載體、出版項（出版者、出版年月）。

{4}中、英文關鍵詞3～8個，中文關鍵詞間空1個字距，不用任何標點符號，英文關鍵詞用分號(；)隔開。

{5}作者姓名的漢語拼音應姓前名后，姓氏全部字母為大寫，名字的首字母大寫，雙名中間不加連字符不間隔；漢語拼音的作者姓名寫在英文表示的工作單位之前；多位作者的署名之間以逗號隔開；不同單位的作者姓名右上角加注序號。

注：因版權方要求，不能公開全文，如需全文，請咨詢雜志社