中间偃麦草和长穗偃麦草染色体核型分析、

摘要

选用从国外引进的中间偃麦草（Elytrigiaintermedia）和长穗偃麦草（E．elongata）种子为材料，采用根尖压片法进行细胞染色体核型分析。结果表明，中间偃麦草染色体数目为2n=6x=42，染色体相对长度组成为：10L＋IOM2＋12M1＋10S，核型公式为：K（2n）=6x=42=34m＋8sm，属于“2B”类型。长穗偃麦草染色体数目为2n=10x=70，染色体相对长度组成为：10L＋22M2＋30Ml＋8S，核型公式为：K（2n）=10x=70=38m＋22sm＋8st＋2t，属于“2B%The chromosome karyotypes of Elytrigia intermedia and E. elongata were determined by the root tip squash method. This study showed that the chromosome type of E. intermedia was K （2n）=6x=42=34m＋ 8sm, and the composition of relative length chromosomes was 10L＋10M2 ＋ 12M1 ＋ 10S, belonging to 2B type. The chromosome type of E. elongata was K（2n）= 10x=70=38m＋ 22sm＋8st＋ 2t, and the composition of rela- tive length chromosomes was 10L＋22M2 ＋30M1 ＋8S, belonging to 2B type. These results would provide theoretical basis for their cytological characteristics and genetic mechanism research.