Sexual reproduction requires recognition between the male and female gametes.In animals,the sperms swim to the egg a......

报道了Ｃ．ｐａｎｚｈｉｈｕａｅｎｓｉｓ胚珠的结构，发育和受精前的雌配子体及颈卵器的发育，幼小胚朱由珠被，珠心组织组成，珠心组织内的功能大孢子经多次分裂形成游离核......

采取不同发育阶段烤烟云烟87的花器官,采用常规石蜡切片法对其解剖结构进行研究。结果表明:烤烟云烟87花药壁发育类型为基本型,分......