Chromosome Counts of Aquatic and Wetland Plants Growing in Acid Sulfate Soil from the Central Plain, Thailand

Abstract

Chromosome numbers were counted in root tip cells of 13 aquatic and wetland plants growing in acid sulfate soil in central Thailand. Results were as follows: Cyperus haspan, 2n = 26; Eleocharis dulcis, 2n = ca. 212; Fimbristylis alboviridis, 2n = 20; Pycreus polystachyos, 2n = 106 (Cyperaceae); Blyxa aubertii, 2n = 40 (Hydrocharitaceae); Digitaria ciliaris, 2n = 54; Imperata cylindrica, 2n = 20; Panicum repens, 2n = 45; Paspalum orbiculare, 2n = 40 (Poaceae); Cleome rutidosperma, 2n = 32 (Capparaceae); Ludwigia adscendens, 2n = 32; Ludwigia hyssopifolia, 2n = 16 (Onagraceae); Melochia corchorifolia, 2n = 36 (Sterculiaceae). Most chromosome numbers were confirmed in the previous reports, but they are reported here for the first time using plant materials from Thailand. The result of Fimbristylis alboviridis (2n = 20) is first report for the species.