Breeding period to the islands on the litter size.

繁殖时期到海岛上产仔.

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Somatic hybridization technique can overcome some difficulties in traditional breeding and shorten breeding period in tobacco.

利用体细胞杂交技术,可以克服传统的有性杂交遇到的诸多育种障碍,加速烟草品种选育进程.

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