Comparison of Drought-Resistance about Three Wild Rocky-Grasses

In this experiment, using the methods of drought-stress in the pot and PEG simulative drought-stress, three native rocky-slope grasses Pogonatherum panideum（Lam.） Hack, Erioophorum comosum nees and Cynodon dactylon cultivated in the pots were selected as materials to study their drought-resistance by analyzing the indexes such as the leaf area index, the drying roots accumulation, the holding water ability of leaf, the relative conductance of leaf, the soluble protein, chlorophyll. At the same time, by comparing with membership function value of each index, the order of each grass drought-resistance was decided. The results showed that the drought-resistance of Erioophorum comosum nees was stronger than Cynodon dactylon and drought-resistance of Cynodon dactylon was stronger than Pogonatherum panideum （Lam.） Hack. The purpose of the experimental results was to find theoretical foundations for selecting and cultivating native protecting-slope vegetations to adapt to rocky slopes.     

吊兰及其变种叶片结构的比较解剖学研究

吊兰及其变种(银心吊兰、银边吊兰)是重要的室内观赏、园艺装饰植物。采用徒手切片、显微观察与测量及数理统计等方法,比较其叶的解剖结构。结果表明:①吊兰、银心吊兰和银边吊兰均为等面叶;叶的结构由表皮、叶肉、叶脉组成。上下表皮由1层细胞组成;气孔器均分布于下表皮,且呈带状排列;叶肉没有栅栏组织和海绵组织之分;叶脉结构简单,由木质部、韧皮部和机械组织组成。②吊兰及其变种叶外观色彩区别明显,叶面积显著差异;上表皮细胞厚度约为下表皮细胞的两倍;上下表皮细胞径向厚度、切向长度、角质层厚度、气孔密度差异明显;叶肉细胞形态和叶绿体数量差异显著;叶脉维管束在横切面上的长度差异极显著;这些特征可以作为吊兰及其变种间的分类学指标。     

唐菖蒲对铅、镉的吸收和利用

用不同浓度(50～300mg/L)的pb2+、Cd2+培养液培养唐菖蒲,发现唐菖蒲对Pb2+的吸收积累作用明显大干对Cd2+的吸收积累作用.其中当Pb2+的浓度为100mg/L时吸收积累量最大,低于或高于此浓度,吸收量均减少.Pb2+在体内的积累与分布规律是根＞球茎＞叶.     

金边吊兰叶细胞超微结构的观察

用透射电镜对金边吊兰地细胞进行了观察，发现同一叶片绿色部分细胞的叶绿体结构正常，黄色部分的细胞没有正常的叶绿体，只有停止发育和退化解体的质体，并对此现象进行了分析。     

百合科植物比较形态解剖学研究——Ⅱ、万年青、吉祥草、紫花玉簪、芦荟、吊兰后生木质部管状分子的比较解剖

根据V.L.Cheadla关于单子叶植物解剖性状演化观点,即(1)根、茎、叶中均存在导管较根、根状茎中具导管或仅根中有导管进化;(2)导管分子短而宽较导管分子长而细进化;(3)单穿孔板类型较梯状穿孔板类型高级,而梯状穿孔板模隔数越少越高级.用上述3条标准对百合科(Liliaceae)中铃兰族(Conval-lavrieae)万年青属(Robdea Roth)万年青(R.japonica(Thunb.)Roth),吉祥草属(Reineckja Kunth)吉祥草(R.carnea(Andr.)Kunth.);萱草族(Hemero ca-lleae)玉簪属(Hosta Tratt.)紫花玉簪(H。albo-marginata(Hook.)Ohwi)芦荟族(Aloeae)芦荟属(Aloe L.)芦荟(A.vera L.var.chinensis(Haw.)Berg.);吊兰族(Asphodeleae),吊兰属(Chlorophytum Ker-Gawl.)吊兰(C.comosum(Thunb.)Peker)等植物的后生木质部管状分子进行比较解剖研究.结果表明:吊兰、芦荟、紫花玉簪较吉祥草、万年青进化.