Abstract
Peristylus goodyeroides is a terestrial orchid that scattered around Southeast Asia. Morphological characters of P. goodyeroides can vary, depending on the ecological factors and habitat. Cytological characters in the form of chromosome configurations can be used as a taxonomic tool for the process of identifying and understanding variations in taxa. The purpose of this study was to determine the morphological characters and chromosome configuration of the P. goodyeroides from Curug Setawing, Kulonprogo. The method used was morphological characterization and plant chromosome preparation by squash method with the main steps of fixation, maceration, staining and observation. Data were analyzed with the help of Image raster 3, Corel Draw X7, and Microsoft Excel 2013. P. goodyeroides from Curug Setawing has the morphological characters of root tubers, cylindrical stems, ovate leaf shape, convolutive leaf arrangement and creamy white flowers. The orchid has a number of chromosomes 2n = 10 with a karyotype formula of 2n = 2x = 8m + 2t. Metacentric chromosomes are found on chromosomes 1-8 and telocentric chromosomes 9-10. The absolute arm length of the chromosomes has a range of 2.03-3.44 μm, the relative arm length of the chromosomes is 2.21-3.32 μm, the length of the p arm is 1.13-1.58 μm and the q arm is 1.23-2.12 μm.
Highlights
Orchids are flowering plants with high diversity and economic value (Zhang et al, 2018; Pamarthi et al, 2019)
Peristylus goodyeroides collected from Curug Setawing, Kulonprogo is included in the subfamily Orchidoideae, tribe
Based on the result of study, it can be concluded that the morphological characters observed in
Summary
Orchids are flowering plants with high diversity and economic value (Zhang et al, 2018; Pamarthi et al, 2019). Curug Setawing is a tourist park area located in the Menoreh Mountains, Kulonprogo, Special Region of Yogyakarta. This area has latosol and grumusol types of soil (Nagara & Buchori, 2013), dry soil condition and humid air. There are 15 species of orchids found with three types of habitus, namely terrestrial, amoebophyte and epiphyte. P. goodyeroides is an orchid commonly found in teak forests and grasslands with an altitude of about 1,750 meters above sea level. The characters of this orchid are white flowers with a diameter of 7-8 mm. The phenotypic characters of P. goodyeroides appeared due to the interaction between genotype and environmental factors (Gienapp et al, 2017; Bocianowski et al, 2019)
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