Subtree analysis and three area satements (TASS) procedure are used to deal with the area relationship in historical biogeography. On the basis of the taxon cladogram, the procedure could identify and eliminate the ...Subtree analysis and three area satements (TASS) procedure are used to deal with the area relationship in historical biogeography. On the basis of the taxon cladogram, the procedure could identify and eliminate the paralogy node and determine the informative subtree. The area relationships are generally illustrated in several subtrees and the consensus tree. The distribution pattern of the genus Caragana comprising about 72 species and occurring in 13 areas, was analyzed by using subtree method and TASS procedure in this study. The results showed seven subtrees representing the area relationships of section and series of the genus, and the consensus tree provided the 13 area relationships. These results are congruent with our former result using component analysis for Caragana.展开更多
文摘以内蒙古中间锦鸡儿(Caragana intermedia)、小叶锦鸡儿(Caragana microphylla),新疆北部粉刺锦鸡儿(Caragana pruinosa)、多刺锦鸡儿(Caragana spinosa)为材料,探讨4种植物叶脉特征是否存在差异,是否促进干旱胁迫下叶忍耐的最低水势的分化。结果表明:中间锦鸡儿、小叶锦鸡儿叶忍耐的最低水势分别为-6.0 MPa和-6.5 M Pa,粉刺锦鸡儿、多刺锦鸡儿忍耐的最低水势分别为-4.0 M Pa和-4.4 M Pa;最低水势与一级脉密度、二级脉密度无线性关系,但随三级叶脉密度和细脉密度的增加而线性增加;最低水势随一级脉、二级脉、三级脉和细脉导管壁厚与导管腔直径比值的三次方(t/b)3增加而增加,但只与细脉(t/b)3显著线性相关。和新疆分布种相比,内蒙古分布种三级脉和细脉密度的增加,细脉抗塌陷能力的增强促进了叶干旱胁迫下忍耐的最低水势的下降。
文摘Subtree analysis and three area satements (TASS) procedure are used to deal with the area relationship in historical biogeography. On the basis of the taxon cladogram, the procedure could identify and eliminate the paralogy node and determine the informative subtree. The area relationships are generally illustrated in several subtrees and the consensus tree. The distribution pattern of the genus Caragana comprising about 72 species and occurring in 13 areas, was analyzed by using subtree method and TASS procedure in this study. The results showed seven subtrees representing the area relationships of section and series of the genus, and the consensus tree provided the 13 area relationships. These results are congruent with our former result using component analysis for Caragana.
