Megasporogenesis and Development of Female Gametophyte in the Apomictic Monosomic Addition Line M14 of Beta corolliflora in Sugar Beet
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摘要: 利用常规石蜡制片法,对甜菜单体附加系M14(Beta vulgarisL.VV+1C、2n=18+1)雌配子体的发生与发育进行了研究,结果表明:二倍体孢子生殖雌配子体为韭型(Allium odorum-type)和蝶须型(Antennaria-type),有性生殖雌配子体为蓼型(Polygonum-type)。韭型和蝶须型的大孢子母细胞发育成为二倍体雌配子体,蓼型大孢子母细胞形成单倍体的雌配子体。在二倍体孢子生殖雌配子体发育过程中,出现发育迟缓,胚囊败育等情况,正常发育的雌配子体只有25%。讨论了二倍体孢子生殖雌配子体发生与发育特点。
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关键词:
- 甜菜单体附加系(VV+1C /
- 2n=18+1) /
- 兼性无融合生殖 /
- 雌配子体 /
- 韭型(Alliumodorum-type) /
- 蝶须型(Antennaria-type) /
- 蓼型(Polygonum-type)
Abstract: The megasporogenesis and development of female gametophyte were studied by paraffin sections in line M14,a chromosome 9 monosomic addition line of Beta corolliflora Zoss.in sugar beet,in which revealed that the egg cell could been produced through diplospory or sexuality.The results are as follows:sexuality is of Polygonum-type,and diplospory is of two types,Allium odorum-type and Antennatia-type in M14.The megasporocyte of Allium odorum-type and Antennatia-type turn into a mature diplosporous female gametophyte.The Megasporocyte Polygonum-type turns into a mature monoplontic female gametophyte.Compared with the sexual female gametophyte,bradygenesis and abortion can be frequently observed during the development of diplosporous female gametophyte.Only 25% of them are normal.The characteristic of diplosporous reproduction is discussed. -
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