Root Morphology, Anatomy, and Mycorrhiza of Peristylus goodyeroides (D.Don) Lindl. (Orchidaceae) in Different Life Stages: Ecological Significance and Implication for Conservation
Gebby Agnessya Esa Oktavia *
Purwodadi Botanic Garden, Research Center for Plant Conservation - National Research and Innovation Agency Jl. Raya Surabaya-Malang Km. 65 Purwodadi, Pasuruan, East Java, 67163, Indonesia and Department of Biology, Faculty of Science and Technology, Universitas Airlangga, Jl. Mulyorejo, Surabaya, East Java 60115, Indonesia.
Siti Nurfadilah
Purwodadi Botanic Garden, Research Center for Plant Conservation - National Research and Innovation Agency Jl. Raya Surabaya-Malang Km. 65 Purwodadi, Pasuruan, East Java, 67163, Indonesia.
Nina Dwi Yulia
Purwodadi Botanic Garden, Research Center for Plant Conservation - National Research and Innovation Agency Jl. Raya Surabaya-Malang Km. 65 Purwodadi, Pasuruan, East Java, 67163, Indonesia.
Ema Hendriyani
Eka Karya Bali Botanic Garden, Research Center for Plant Conservation - National Research and Innovation Agency, Candikuning, Baturiti, Tabanan, Bali, 82191, Indonesia.
*Author to whom correspondence should be addressed.
Abstract
Orchid roots have vital functions for water absorption, nutrient uptake, a place of symbiosis with mycorrhizal fungi, adaptation, and survival. The aim of the present study was to investigate root traits in terms of root morphological, anatomical, and mycorrhizal features of a terrestrial orchid, Peristylus goodyeroides in relation to an ecological significance of root traits in survival of seedlings, juveniles, and adults of the orchid. Results showed that some morphological characters (root length and depth), anatomical features (cortical cell size, xylem number and diameter), and mycorrhizal features (peloton size and number) were significantly different between seedlings, juveniles, and adults. In relation to root functional traits, lowest root length, depth, xylem number and diameter, peloton size and number in seedlings can be associated with low capacity in water and nutrient acquisition that might explain low survival of seedlings relative to juveniles and adults. Present study has implication for orchid conservation suggesting high attention in low survival rate of seedlings related to specificity in some of their morphological, anatomical, and mycorrhizal features which can be associated with low capacity in water and nutrient acquisition. It is vital to ensure water availability for seedlings, particularly, during dry seasons to decrease high mortality of seedlings as such high mortality can have adverse impacts on long-term survival of the orchid population.
Keywords: Root, morphology, anatomy, mycorrhiza, orchid, life stage