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长久以来植物学界认定稻 (OryzasativaL .)是单子叶植物。作者从稻胚发育的研究中确认稻胚具二型子叶 ,并非单子叶。稻属其他种的胚胎形态与O .sativa是否相同 ?是否具二型子叶 ?根据扫描电子显微镜的观察结果 ,稻属 (Oryza) 2 2个种和亚种的胚的形态结构可以分为两种类型。O .sativa等 16个种胚具腹鳞和侧鳞 ,属第一类型 ;O .meyeriana (Zoll.etMor.exSteud .)Baill.ssp .tuberculataW .C .WuetY .G .Lu ,G .C .Wang等 6个种 (亚种 )胚缺腹鳞和侧鳞 ,属第二类型。O .sativa和O .meyerianassp .tuberculata的胚胎发育过程所出现的盾片原基、胚根鞘原基、胚芽鞘原基和生长锥均来自原胚 ,前二者发育成胚套 ,是外围子叶 ;胚芽鞘原基发育成围在生长锥外并盖住生长锥的空心的倒锥状胚芽鞘 ,是顶生子叶。第一类型与第二类型稻胚都具有二型子叶。第二类型稻胚在盾片原基发育过程中并不分化出腹鳞和侧鳞 ,因而造成第二类型稻胚缺腹鳞与侧鳞。稻的二型子叶源于原胚的背腹极性分化
Oryza sativa L. has long been a monocot. The authors identified rice embryos as type II cotyledons, not monocotyledons, from studies on rice embryo development. Are other embryos of Oryza species identical to O. sativa? Is there a type II cotyledon? According to the observation by scanning electron microscopy, the morphological structure of embryos of 22 species and subspecies of Oryza can be divided into two types Types of. O.Sativa and other 16 kinds of embryos with abdominal scales and lateral scales, is the first type; O. Meyeriana (Zoll.etMor.exSteud.) Baill.ssp.tuberculataW.C.WuetY.G.Lu, G.C.Wang Six other species (subspecies) lack of abdominal scales and lateral scales, is the second type. O.sativa and O. Meyerianassp. Tuberculata embryonic development occurred in the scutellum primordia, radicle sheath primordia, coleoptile and growth cone are derived from the original embryo, the former two embryos developed into the outer cotyledons ; Coleoptile primordium developed into a growth cone around the growth cone and hollow inverted cone coleoptile, is the top born cotyledons. Both Type I and Type II rice embryos have type II cotyledons. The second type of rice embryo did not differentiate into abdominal scales and lateral scales during the development of scutellum primordium, resulting in the lack of abdominal scales and lateral scales in the second type of rice embryos. Type II cotyledons of rice originate from the dorsoventral polarization of the proembryo