An Attempt to Produce a Photo-neutral Strain of Jute through Interspecific Hybridization

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  • 種間交雑によるジュートアサ不感光性系統の育成に関する研究
  • 種間交雑によるジュートアサ不感光性系統の育成に関する研究〔英文〕
  • シュカン コウザツ ニヨル ジュートアサ フ カンコウセイ ケイトウ ノ イク

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In 1969 an almost sterile hybrid (2n=14) between a short-day variety of 'Tossa' jute (=Corchorus olitorius; 2n=14) and a photo-neutral wild species, C, depressus (2n=14) was obtained. In F3, approximately 80% of the plants were short-day and 20% photo-neutral suggesting that the latter character is probably recessive. A few F3's chosen at random for chromosome counts turned out to be tetraploids (2n=28) indicating that the F2 parents of the F3 population underwent chro-mosome doubling. While characters of the economic importance such as height and nonbranching habit were almost restored in the F4 and the F5, fibre qualities deteriorated in thern. Fibre qualities however improved in sorne backcross progeny. Further the recessive (?) character for photo-neutrality continued to segregate in F4 and in F5' The presence of a paracentric inversion throwing out the gene in the form of a fragment during chromatid bridge formation is suggested to be the cause for the non-fixation of the photo-neutral character in the progeny.

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