Propagation is an inseparable process of plant conservation. Thus, in order to optimize conservation effort, the germination process of targeted species has to be fully understood, including germination and seedling development types. This research aimed to determine the germination and seedling development types of Pinanga arinasae Witono and Euchresta horsfieldii (Lesch.) Benn. Germination experiment was conducted at the Seed Bank Laboratory, Eka Karya Botanic Garden, Bali. Seeds of both species was sown in petri dishes with straw paper medium and incubated in the growth chamber. Qualitative-descriptive data analysis was used to describe both plant germination and seedling development types. The result showed that both P. arinasae and E. horsfielldii have hypogeal germination type, with P. arinasae germination type further described as adjacent ligular. Seedling development type of P. arinasae and E. horsfieldii were cryptocotylar hypogeal with reserve storage or absorption cotyledons (CHR) and phanerocotylar hypogeal with reserve storage or absorption cotyledons (PHR), respectively. The germination and seedling development types provide information about plant adaptation that can be used to optimize conservation efforts of P. arinasae and E. horsfielldii.
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