The embryo structure of two apomictir lines 296B and SSA-1 has been com-pared in present paper. The apomictic embryo has the same character of lacking (or short) sus-pensor in sorghum,otherwise,the sexual embryo has a...The embryo structure of two apomictir lines 296B and SSA-1 has been com-pared in present paper. The apomictic embryo has the same character of lacking (or short) sus-pensor in sorghum,otherwise,the sexual embryo has a long suspensor in the same species. This character as an index of judgement on apomxis was discussed. The same of unsexual embryos in the lack of suspensor suggested that there were some relationships between non-zagotic embryos.展开更多
The presence of facultative apomixis In line 296B was proved by the embryologicalstudy.The twin embryosacs were observed at florescence.The autonomous development of em-bryo was confirmed by multiple cell proembryo ex...The presence of facultative apomixis In line 296B was proved by the embryologicalstudy.The twin embryosacs were observed at florescence.The autonomous development of em-bryo was confirmed by multiple cell proembryo existing with undeveloped polar nuclei In one embryosac.Cell structure and size of apomictic proembryo were different from sexual proembryo.The structural feature of proembryo can be used to distinguish apomictic proembryo with devel-oped endosperm from sexual embryo.The apomictic development in this line is attributed toaposporous type.The frequency of apomixis Is at least 16—21%.The apomictic characters andthe potential for fixing heterosis in line 296B was dlscussed in the present paper.展开更多
文摘The embryo structure of two apomictir lines 296B and SSA-1 has been com-pared in present paper. The apomictic embryo has the same character of lacking (or short) sus-pensor in sorghum,otherwise,the sexual embryo has a long suspensor in the same species. This character as an index of judgement on apomxis was discussed. The same of unsexual embryos in the lack of suspensor suggested that there were some relationships between non-zagotic embryos.
文摘The presence of facultative apomixis In line 296B was proved by the embryologicalstudy.The twin embryosacs were observed at florescence.The autonomous development of em-bryo was confirmed by multiple cell proembryo existing with undeveloped polar nuclei In one embryosac.Cell structure and size of apomictic proembryo were different from sexual proembryo.The structural feature of proembryo can be used to distinguish apomictic proembryo with devel-oped endosperm from sexual embryo.The apomictic development in this line is attributed toaposporous type.The frequency of apomixis Is at least 16—21%.The apomictic characters andthe potential for fixing heterosis in line 296B was dlscussed in the present paper.
