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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Comparative Karyomorphological Study between Male and Female Plants of Some Cycas and Zamia Species) ผู้เขียน: ดร.นิตย์ศรี แสงเดือน, ศาสตราจารย์เกียรติคุณ ,  Methanee Toahsakul, ดร.วิภา หงษ์ตระกูล, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThis paper presents the karyotype and the idiogram of known sex plants for five species of Cycas (Cycadaceae) and seven species of Zamia (Zamiaceae). All five species of the genus Cycas had the same chromosome number (2n = 2x = 22) but their karyotype formulae varied into three groups: 10m+10sm+2st, 12m+8sm+2st and 14m+8sm. The karyotype of male and female Cycas plants could be clearly distinguished by the satellite chromosomes. All seven species of the genus Zamia varied in both chromosome numbers (2n = 2x = 16 up to 2n = 2x = 24) and karyotype formulae. It was difficult to differentiate between the male and female plants of the Zamia spp. by karyotyping because of the lack of satellite chromosomes in both sexes. |