五种土人参属植物（马齿苋科）的倍性水平与CAM之间的关系

RELATIONSHIP BETWEEN PLOIDAL LEVEL AND CAM IN FIVE SPECIES OF TALINUM (PORTULACACEAE).

作者信息

Harris Fred S, Carter M Eloise B, Martin Craig E

机构信息

Department of Botany, University of Kansas, Lawrence, Kansas, 66045.

Department of Biology, Oxford College, Emory University, Oxford, Georgia, 30267.

出版信息

Am J Bot. 1993 May;80(5):533-536. doi: 10.1002/j.1537-2197.1993.tb13836.x.

DOI:10.1002/j.1537-2197.1993.tb13836.x

PMID:30139151

Abstract

Plants (N = 102) from 23 populations of Talinum, representing five morphologically similar species, were examined in a test of the hypothesis that ploidal level may be correlated with levels of Crassulacean acid metabolism. When grouped by species and ploidal level, two groups of tetraploid plants, T. calcaricum and tetraploid individuals of T. calycinum, had significantly greater malic acid accumulations than any other group, including diploid individuals of T. calycinum. Another tetraploid, T. teretifolium, did not show greater malic acid fluctuations than the diploids, including two putative ancestors (T. mengesii and T. parviflorum). Similarly, malic acid fluctuations in tetraploid individuals of T. parviflorum were not different from diploid individuals of the same species. Nonetheless, when all plants were compared, nocturnal accumulations of malic acid in tetraploid plants were significantly greater than those of diploid plants.

摘要

对来自土人参属23个种群的102株植物进行了研究，这些植物代表了5个形态相似的物种，旨在验证多倍体水平可能与景天酸代谢水平相关这一假说。按物种和多倍体水平分组后，两组四倍体植物，即距花土人参和大花土人参的四倍体个体，其苹果酸积累量显著高于其他任何组，包括大花土人参的二倍体个体。另一种四倍体植物，圆叶土人参，其苹果酸波动幅度并不比二倍体植物大，包括两个假定的祖先种（门氏土人参和小花土人参）。同样，小花土人参四倍体个体的苹果酸波动与同物种二倍体个体并无差异。尽管如此，当对所有植物进行比较时，四倍体植物夜间苹果酸的积累量显著高于二倍体植物。