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種間雜交的主要障礙是F1代的不育性.A major barrier to interspecific hybridization is sterility in the F 1 progeny.因此,向日葵細胞質雄性不育性的研究備受關注.That is why cytoplasmic male sterility ( CMS ) in sunflower is the research focus through years....

“不育性”的英語可以翻譯為：infertility，sterility ...