| Analysis of Disequilibrium Hybridization in Hybrid and Backcross Progenies of Saccharum officinarum × Erianthus arundinaceus |
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| 作者单位： | DENG Zu-hu,ZHANG Mu-qing,LIN Wei-le,LI Yu-chang,LAI Li-ping,LIN Yan-quan,CHEN Ru-kai(Key Lab of Genetic Improvement for Sugarcane,Ministry of Agriculture,Fuzhou 350002,P.R.China);CHENG Fu,ZHANG Chui-ming(Guangzhou Sugarcane Industry Research Institute,Guangzhou 510642,P.R.China) |
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| 摘 要： | Erianthus arundinaceus is an important, closely related genus of Saccharum officinarum L. It is therefore important to understand how the chromosomes are transmitted when it hybridizes with sugarcane. The hybrids and backcross progenies of S. officinarum and E. arundinaceus and their parents were used for Karyotype analysis and to study the law of chromosome transmission. The results showed that the somatic chromosome number of both of the E. arundinaceus Hainan92-105 and Hainan92-77 were 2n = 60 = 60sm, belonging to type 1 A, and the BC1 YC01-21 was 2n = 104 = 100m ＋ 4sm, belonging to type 2C. The other six tested clones belonged to type 2B. The both F1s YC96-66 and YC96-40 that originated from Badila （2n = 80 = 70m ＋ 10sm） with E. Arundinaceus were 2n = 70 = 68m ＋ 2sm, which suggests an n ＋ n transmission. The cross between YC96-66 （female parent） and CP84-1198 （male parent, 2n = 120 = 114m ＋ 6sm） also followed the same genetic law and the somatic chromosome number of their progeny, YC01-3 （2n = 105 = 95m ＋ 10sm）. The cross derived from YC96- 40 （female） and CP84-1198 （male）, YC01-21 had 2n = 104 = 100m ＋ 4sm chromosomes, following the same genetic law of n ＋ n. However, YC01-36 had 2n = 132 = 130m ＋ 2sm chromosomes, which suggests a 2n ＋ n chromosome transmission. It can be inferred that the inheritance of chromosomes was very complex in the BC1. The difference in chromosome number between clones was as high as 28. This could be explained by the 2n ＋ n transmission of chromosomes. In addition, as there was not be a regular number of haploids, this phenomenon is termed as disequilibrium hybridization.
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| 关 键 词： | 杂交后代 回交后代 甘蔗属 体细胞染色体数目 斑茅 网络传输 失衡 遗传规律 |
| 收稿时间： | 26 August 2009 |
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