摘要
本文分析的麦吊云杉、峨眉冷杉等４种２变种松科植物属我国特有种，主产中国西部，观察到的根尖细胞核型有５种为首次报导。麦吊云杉（Ｐｉｃｅａｂｒａｃｈｙｔｙｌａ）和变种油麦吊云杉（Ｐ．ｂ．ｖａｒ．ｃｏｍｐｌａｎａｔａ）为２Ａ核型，Ｋ（２ｎ）＝２４＝２０ｍ＋４ｓｍ；天山云杉（Ｐ．ｓｃｈｒｅｎｋｉａｎａｖａｒ．ｆｉａｎｓｈａｎｉｃａ）为２Ｂ核型，Ｋ（２ｎ＝２４＝１６ｍ＋８ｓｍ；峨眉冷杉（Ａｂｉｅｓｆａｂｒｉ）为２Ａ模型，Ｋ（２ｎ）＝２４＝１４ｍ＋８ｓｍ＋２ｓｔ；红杉（Ｌａｒｉｘｐｏｔａｎｉｎｉｉ）为２Ａ核型，ｋ（２ｎ）＝２４＝１２ｍ＋１０ｓｍ＋２ｓｔ；高山松（Ｐｉｎｕｓｄｅｎｓａｔａ）为１Ａ核型，ｋ（２ｎ）＝２４＝２４ｍ。试材来源于原始林区的自然居群，根据核型资料，结合各种的生态、地理分布，进行了遗传变异及进化程度的讨论。
This work deals with the karyotypic analysis on somatic chromosomes of 6 endemic species of Pinaceae in China, in which there are 5species concerned for the first time. The studies materials come from the natural forest in the West Sichuan, West Tianshan Moutain. (See Table 1) The chromosomes in root-tip cells of the plants are found to be 2n=24, the karyotypic formulas and karyotypes: Picea brachytyla 2n=24=20m+45m & 2A; P. brachytyla var. complanata 2n=24=20m+4sm & 2A; P. shrenkiana var. fianshanica 20=24=16m+8sm & 2B, Abies fabri 2n =24=14m+8sm+2st & 2A; Larix potaninii 2n=24=12m+10sm+2st & 2A; Pinus densata 2n =24=24m & 1A; Th3 lengths,arm ration and karyotypic symmetries of the species are given in th Table 2. Based on the evidence from the karyotypic analysis, ecology and geographic distribution,the probable centres of genetic diversity and the probable evolutionary pattern of Pinus-Picea-Abies-Larix have been discussed.
出处
《四川农业大学学报》
CSCD
1994年第1期84-91,共8页
Journal of Sichuan Agricultural University
关键词
红杉
高山松
核型
细胞地理学
PICEA BRACHYTYLA
P. BRACHYTYLA VAR. COMPLANATA
P. SCHRENKIANA VAR. TIANSHANICA
ABIES FABRI
LARIX POTANINII
PINUS DENSATA
KARYOTYPE
CYTOGEOGRAPHS.
