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Nous fournissons des preuves et des solutions concrètes pour transformer l’utilisation des terres et la production alimentaire : conserver et restaurer les écosystèmes, répondre aux crises mondiales du climat, de la malnutrition, de la biodiversité et de la désertification. En bref, nous améliorons la vie des populations.

CIFOR–ICRAF publishes over 750 publications every year on agroforestry, forests and climate change, landscape restoration, rights, forest policy and much more – in multiple languages.

CIFOR–ICRAF addresses local challenges and opportunities while providing solutions to global problems for forests, landscapes, people and the planet.

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Revealing Rhizosphere of Edelweiss (Anaphalis longifolia), Plant Pioneer Species in the Volcanic Mountain Ecosystem in Indonesia

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Edelweiss (Anaphalis longifolia (Blume) Blume ex DC.) is a pioneer plant on young volcanic soil rich in sulfur (S), developing a mono-specific forb layer. Unfortunately, their population is threatened by illegal over-harvesting. Hitherto, the autecological understanding of its rhizosphere is limited. The study aimed to observe compounds and functional microbial populations that may play important roles in this challenging environment. The study was conducted in the Kelimutu National Park (Flores, Indonesia), between 1200 and 1600 meters above sea level. Soil samples were collected from both bulk soil and root zone. Chemical analysis for soil and plant tissue samples used gas chromatography and mass spectrometry (GCMS). Soil microbial populations were analyzed using plate count and most probable number (MPN) methods. Data revealed that the most abundant root exudates were organic acids, which contribute to the formation of rhizosphere community. Colonization of functional groups is found to be more strongly determined by the rhizosphere assemblage than by elevation. Several substances recognized as phytotoxins may play an important role against pests and diseases in the soil. Data further revealed that rhizosphere assemblage by edelweiss produces substances classified as allelochemical compounds assumedly suppressing other plants. Compounds classified as insect repellents were also found in the leaf tissue. It can be concluded that the success of edelweiss as a pioneer in mono-specific stands on the volcanic soil of high altitude can be attributed to its rhizosphere assisting in reducing availability of S and improving C, K and N.

DOI:
https://doi.org/10.17957/IJAB/15.2107
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