1. The critical problem encountered in the breeding work of autotetraploid rice is the low and unstable fertility.
结实低而不稳是四倍体水稻育种遇到的重要障碍。
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2. This paper studied the fertilization of the hybrid between autotetraploid sorghum and Johnson grass and the genetic characters of the hybrid generation.
本试验研究了高粱同源四倍体与约翰逊草远缘杂交的结实性及其后代表现。
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3. The seed setting rate has no obvious difference between autotriploid and autotetraploid, but it will rise with the increase of the self-bred generations.
③同源三倍体和同源四倍体之间的自交结实率没有明显的区别，结实率会随着自交代数的增加而上升。
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4. The formation of the aleuronic layer cell wall in autotetraploid and its original diploid rice was studied by using the technique of fluorescence microscopy.
5. Compared with diploid control, the pollen fertility and seed set of autotetraploid declined dramatically, especially in preliminary generations, and they were only 59.
与二倍体对照相比，同源四倍体材料的花粉育性、结实率均不同程度下降，尤其低代材料的花粉育性59。
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6. The values of total erythrocyte volume and total surface area per milliliter blood are significantly(Plower in autotetraploid than those in interploid 3n and 2n control.
团头鲂同源四倍体每毫升血液红细胞的总体积和总表面积，均明显低于二倍体和倍间三倍体团头鲂（P
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7. The values of total erythrocyte volume and total surface area per milliliter blood are significantly(Plower in autotetraploid than those in interploid 3n and 2n control.
团头鲂同源四倍体每毫升血液红细胞的总体积和总表面积，均明显低于二倍体和倍间三倍体团头鲂（P
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We successfully obtained autotetraploid of oriental melon using colchicine. 获得了同源四倍体材料。
The low seed setting percentage is the most important reason that limits the application of the autotetraploid rice. 同源四倍体水稻结实率偏低是影响其在育种中直接应用的重要原因。
