TY - JOUR AU - Soontornchainaksaeng, Puangpaka AU - Chantaranothai, Pranom AU - Senakun, Chadaporn PY - 2014/12/08 Y2 - 2024/03/29 TI - Cytological Investigation of Macaranga in Comparison to Mallotus (Euphorbiaceae) in Thailand JF - Thai Forest Bulletin (Botany) JA - Thai Forest Bull., Bot. VL - 0 IS - 35 SE - Articles DO - UR - https://li01.tci-thaijo.org/index.php/ThaiForestBulletin/article/view/24206 SP - 89-93 AB - Eight species of <em>Macaranga</em> (Euphorbiaceae) in Thailand were investigated cytologically. The results indicated that, for all species, their pollen mother cells have 2n = 22 and x = 11 consistently. Chromosomes are very well stained with propionocarmine and highly distinctively paired as bivalents at<br />diakinesis and separated to 11:11 at anaphase I. Bivalent length was found to be in the range of 1.3 to 6.0 µm in pollen mother cells of about 8.7–28.0 µm. Hence <em>Macaranga</em> species may be fertile in the wild. From a cytological point of view, <em>Macaranga</em>  resembles <em>Mallotus</em> in chromosome numbers and stainability but differs in cell size. Pollen mother cells and nucleoli of <em>Macaranga</em> are on average smaller than those<br />of <em>Mallotus</em>. Therefore, cytological data support the distinction of these two genera. Moreover the results also pointed out that <em>Mallotus</em> is more variable than <em>Macaranga</em>. ER -