接合zygosome接合染色体zygosperm接合孢子zygospore接合孢子zygote接合子zygotenucleus接合子核zygotenestage偶线期zygoticinduction接合子诱导zygoticlethality合子致死zygoticsterility二倍体不育zygotonucleus合子核...