摘要
研究表明,尽管(小偃7430×烟农15)和(小偃7430×鲁麦1号)两个杂种F_1花粉母细胞减数分裂过程非常紊乱,但小孢子能正常发生,其可育花粉分别为87.95%和86.80%,能够满足传粉受精的需要。(小偃7430×烟农15)杂种F_1 91.20%的雌配子体发育正常,其中80.35%发生了正常的双受精。无论在发育正常的种子中,还是瘪小或中途停止发育的种子中,胚的分化基本能够完成,但在正常受精的子房中仅有12.10%的胚乳能正常发育。因此胚乳败育是导致八倍体小偃麦与普通小麦杂种F_1自交结实率降低的主要原因。
The reason of low fertility of F_1 of(octoploid Agrotriticum × T.aestivum L.)was studied cytoembryologically in this pa-per.The results show:the meioses of PMCof F_1 in both(Xiaoyan 7430 × Yannong15)and(Xiaoyan 7430 × Lumai No.1)were quite chaotic,but the rates of fertilepollens in 3-nucleated stage were 87.95%and 86.80% respectivelly.In all of the em-bryo sacs observed at anthesis in(Xiaoyan7430 × Yannong 15),91.00% of the fe-male gamates were normal,double fertili-zation occured in 80.00% of the normalembryo sacs.12.00% of endosperms develo-ped normally,the others were degeneratedin various ways at different stages,but allembryos developed normally.So the lowfertility of F_1 between octoploid Agrotriti-cum and T.aestivum L.is mainlly causedby the degeneration of endosperms.
出处
《实验生物学报》
CSCD
1992年第3期273-281,共9页
Acta Biologiae Experimentalis Sinica
关键词
八倍体小偃麦
小麦
细胞胚胎学
Octoploid Agrotriticum.T.aestivum L..Cytoembryology.Development.
