被子植物根的形态和结构

1、实验三 被子植物根的形态和结构实验内容1. 根尖的形态及分区2. 根的初生结构双子叶植物根的初生结构单子叶植物根的初生结构3. 双子叶植物根的次生结构4. 侧根的发生5. 根瘤和菌根1. 根尖的形态及分区实验材料和方法萝卜根尖从外部形态上观察根尖4个分区的特点。小麦根尖纵切片观察根尖各区的内部结构和细胞特点。思考：1）根毛是如何发生的？2）最短的根毛在什么部位？3）根尖各区在外部形态和内部结构上有无明显的界限？萝卜根尖的外部形态植物根尖纵切2.根的初生结构-双子叶植物实验材料和方法蚕豆幼根横切片2. 根的初生结构-单子叶植物实验材料和方法鸢尾根横切片芋头幼根横切面临时装片（示凯氏点）鸢尾根横切

2、片鸢尾根横切片芋头幼根横切面临时装片（观察凯氏点）3. 双子叶植物根的次生结构实验材料和方法桑老根横切片桑老根横切片木栓形成层桑老根横切片维管形成层4. 侧根的发生实验材料和方法蚕豆根横切面切片 侧根的发生5. 根瘤和菌根实验材料和方法根瘤：观察花生、楹树、田菁、紫云英等新鲜或液浸标本。花生根瘤横切片菌根：带根的马尾松幼苗松外生菌根横切片根瘤豆科植物根瘤的形态花生根瘤横切片松外生菌根实验报告1、绘鸢尾根横切面（1/2）简图，示根的初生结构。2、绘桑老根横切面（1/2）简图，示双子叶植物老根的次生结构。实验材料1、萝卜根尖2、洋葱根尖纵切片3、蚕豆幼根横切片（示根初生结构及侧根） 4、鸢尾根横切

3、片5、芋头幼根横切面临时片（示范凯氏点）6、桑老根横切片7、花生、楹树、田菁、紫云英等新鲜或液浸标本（示范根瘤）8、花生根瘤横切片9、带根松树幼苗（示范菌根）SgPdMaI7F3C0z)v&s!pXmUiRfOcK9H6E2B+y(u%rZoWlThQeNbJ8G4D1A-w*t$qYnVjSgPdLaI7F3C0y)v&s#pXmUiRfNcK9H5E2B+x(u$rZoWkThQeMbJ7G4D1z-w*t!qYmVjSgOdLaI6F3C0y)v%s#pXlUiRfNcK8H5E2A+x(u$rZnWkThPeMbJ7G4C1z-w&t!qYmVjRgOdL9I6F3B0y(v%s#oX

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10、lUiQfNcK8H5E2A+x*u$rZnWkThPeMaJ7G4C1z-w&t!pYmVjRgOdL9I6E3B0y(v%s#oXlTiQfNbK8H5D2A-x*u$qZnWkShPdMaJ7F4C1z)w&s!pYmUjRgOcL9I6E3B+y(v%r#oXlTiQeNbK8G5D2A-x*t$qZnVkShPdMaI7F4C0z)w&s!pXmUjRfOcL9H6E2B+y(u%r#oWlThQeNbJ8G5D1A-x*t$qYnVkSgPdMaI7F3C0z)v&s!pXmUiRfOcK9H6E2B+x(u%rZoWlThQeMbJ8G4D1A-w*t!qYnVjSgPdLaI6

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