Abstract
Epiphytic and leafless orchids possess specialized root structures and host diverse associated microorganisms, which may contribute to their adaptation to limited access to water, nutrients, and photosynthetic tissues. Microscopic, anatomical, and molecular analyses of aerial and substrate roots of Chiloschista lunifera (Rchb.f.) J.J.Sm. revealed consistent phototrophic microbial biofilms on the velamen surface. These biofilms comprised filamentous and unicellular cyanobacteria, singular bacterial cells, and green algae. Morphological characterisation identified cyanobacteria belonging to five taxonomic orders, which are Chroococcales, Chroococcidiopsidales, Nostocales, Leptolyngbyales, and Synechococcales. 16S rRNA amplicon sequencing confirmed cyanobacterial dominance, with Chroococcidiopsis thermalis PCC 7203 strongly prevalent in root wash samples (up to 99.99% relative abundance), while root homogenate samples harboured a more diverse assemblage including Phormidiaceae, Leptolyngbya, Scytonema, and Calothrix. In addition, a green alga from Watanabeales (Jaagichlorella sp.) was identified based on morphological characteristics. TEM showed diverse cyanobacterial forms and unicellular green algae with well-developed photosynthetic structures. Root anatomy differed between root types. Substrate roots exhibited an inverted kidney-shaped transverse profile, whereas aerial roots were circular, with differences in velamen distribution reflecting adaptation for water retention and substrate attachment. Branched root hairs occurred on substrate roots, while aerial roots possessed unbranched root hairs, indicating functional specialization. Autofluorescence analysis revealed lignified tissues and abundant cortical chloroplasts, suggesting a photosynthetic role of the roots that may compensate for leaflessness. These findings enhance our understanding of the anatomical and ultrastructural features of epiphytic leafless orchid roots and may support future conservation and propagation efforts.
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Claims 12
Claim · model-written summary
Aerial and substrate orchid roots had phototrophic biofilms on the velamen.
- Taxon
- Chiloschista lunifera
Chiloschista luniferat0 - Organ / stage
- aerial and substrate rootse0
- Outcome
- phototrophic microbial biofilmse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“aerial and substrate roots of Chiloschista lunifera (Rchb.f.) J.J.Sm. revealed consistent phototrophic microbial biofilms on the velamen surface”
t0“Chiloschista lunifera”
Claim · model-written summary
Biofilms included filamentous and unicellular cyanobacteria, bacterial cells and green algae.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Interactor
- cyanobacteriaCyanobacteriotae0symbiont
- Outcome
- filamentous and unicellular cyanobacteria, singular bacterial cells, and green algaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These biofilms comprised filamentous and unicellular cyanobacteria, singular bacterial cells, and green algae”
t0“Chiloschista lunifera”
Claim · model-written summary
Cyanobacteria from five orders were identified on orchid roots.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Interactor
- cyanobacteriaCyanobacteriotae0symbiont
- Outcome
- five taxonomic orderse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cyanobacteria belonging to five taxonomic orders, which are Chroococcales, Chroococcidiopsidales, Nostocales, Leptolyngbyales, and Synechococcales”
t0“Chiloschista lunifera”
Claim · model-written summary
Cyanobacteria dominated root wash samples, with Chroococcidiopsis thermalis PCC 7203 reaching 99.99% relative abundance.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Organ / stage
- root wash samplese0
- Interactor
- Chroococcidiopsis thermalis PCC 7203Chroococcidiopsis thermalis PCC 7203e0symbiont
- Outcome
- relative abundancee0
- Value
- 99.99%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cyanobacterial dominance, with Chroococcidiopsis thermalis PCC 7203 strongly prevalent in root wash samples (up to 99.99% relative abundance)”
t0“Chiloschista lunifera”
Claim · model-written summary
Root homogenates held a more diverse cyanobacterial assemblage.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Organ / stage
- root homogenate samplese0
- Interactor
- PhormidiaceaeOscillatoriaceaee0symbiont
- Outcome
- more diverse assemblagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root homogenate samples harboured a more diverse assemblage including Phormidiaceae, Leptolyngbya, Scytonema, and Calothrix”
t0“Chiloschista lunifera”
Claim · model-written summary
The green alga Jaagichlorella sp. was identified.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Interactor
- Jaagichlorella sp.Jaagichlorellae0symbiont
- Outcome
- Jaagichlorella sp.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a green alga from Watanabeales (Jaagichlorella sp.) was identified based on morphological characteristics”
t0“Chiloschista lunifera”
Claim · model-written summary
TEM showed cyanobacteria and green algae with developed photosynthetic structures.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Interactor
- cyanobacterial formse0symbiont
- Outcome
- well-developed photosynthetic structurese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TEM showed diverse cyanobacterial forms and unicellular green algae with well-developed photosynthetic structures”
t0“Chiloschista lunifera”
Claim · model-written summary
Substrate roots had an inverted kidney-shaped cross section, while aerial roots were circular.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Organ / stage
- Substrate rootse0
- Outcome
- inverted kidney-shaped transverse profilee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Substrate roots exhibited an inverted kidney-shaped transverse profile, whereas aerial roots were circular”
t0“Chiloschista lunifera”
Claim · model-written summary
Velamen distribution differed between aerial and substrate roots.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Organ / stage
- velamene0
- Outcome
- differences in velamen distributione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences in velamen distribution reflecting adaptation for water retention and substrate attachment”
t0“Chiloschista lunifera”
Claim · model-written summary
Substrate roots had branched root hairs, while aerial roots had unbranched hairs.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Organ / stage
- substrate rootse0
- Outcome
- Branched root hairse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Branched root hairs occurred on substrate roots, while aerial roots possessed unbranched root hairs”
t0“Chiloschista lunifera”
Claim · model-written summary
Roots showed lignified tissues and abundant cortical chloroplasts.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Outcome
- lignified tissues and abundant cortical chloroplastse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Autofluorescence analysis revealed lignified tissues and abundant cortical chloroplasts”
t0“Chiloschista lunifera”
Claim · model-written summary
The authors inferred that orchid roots may photosynthesize to compensate for leaflessness.
- Taxon
- Chiloschista luniferaChiloschista luniferat0
- Organ / stage
- rootse0
- Outcome
- photosynthetic role of the rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting a photosynthetic role of the roots that may compensate for leaflessness”
t0“Chiloschista lunifera”