作　　者： ; ;

机构地区： 中国热带农业科学院热带作物品种资源研究所农业部热带作物种质资源利用重点开放实验室

出　　处： 《热带作物学报》 2010年第1期45-48,共4页

摘　　要： 观测和统计分析了10个狗牙根和8个弯穗狗牙根种源的17个外部形态性状。结果表明:(1)与狗牙根相比,弯穗狗牙根的直立枝和匍匐枝叶片均较宽,节间较粗,差异显著;(2)弯穗狗牙根的叶片浅绿色,柱头紫褐色,而狗牙根的叶片较深,为绿色或深绿色,柱头为紫色、紫红或浅紫色;(3)弯穗狗牙根叶片和叶鞘均无毛,而狗牙根有毛。因此,直立枝和匍匐枝的叶片宽度、节间直径、叶色、柱头颜色、叶片毛况和叶鞘毛况7个外部形态性状可作为鉴别这2个种的形态学指标。 Seventeen morphological characteristics of 10 accessions of Cynodon dactylon （Linnaeus） Persoon and 8 accessions of Cynodon radiatus Roth ex Roemer et Schultes were analyzed and compared. The results showed that C. radiatus had broader leaves in the upright stem and stolon and thicker internodes than C. dactylon, with obvious difference. For C. radiatus, the leaves are light green and the stigma purplish brown, whereas for C. dactylon the leaves are darker, either green or dark green, and the stigma purple, purplish red or light purple. C. radiatus has no hair in their leaves and sheaths but C. dactylon does. Therefore, these 7 morphological characteristics, i.e. leaf width, internodal thickness, color of leaf and stigma, hair of leaf and leaf sheath can be used as morphological indexes to distinguish these two species.

关 键 词： 狗牙根 弯穗狗牙根 形态性状 鉴定

领　　域： [农业科学]