Site amelioration for direct seeding of Caladenia tentaculata improves seedling recruitment and survival in natural habitat

Wright, Magali; French, G. W.; Cross, R. J.; Cousens, Roger; Andrusiak, Sascha M.; McLean, Cassandra B.

doi:10.15517/lank.v7i1-2.19653

Cited by 4 publications

(5 citation statements)

References 6 publications

(7 reference statements)

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“…In terrestrial taxa, soil structure affects the ability of seeds to trickle down to a required depth before germination (Wright et al, 2007), and it also affects the efficiency by which mycelia spread in the ground (Otten et al, 2001). Seed packet experiments investigating depth of sowing may show differential germination in different strata of the soil, the best result being found surprisingly deep at 10 cm below the surface (Van der Kinderen, 1995).…”

Section: Abiotic Factorsmentioning

confidence: 99%

“…Many of these interactions remain largely unexplored and clearly need to be considered if a site is to be ameliorated for recruitment of seedlings (Wright et al, 2007). Even with establishment of an enduring orchid mycorrhiza, few seedlings may survive the early seedling establishment phase (McKendrick et al, 2000), so presumably seedling mortality is often high in nature.…”

Section: Biotic Factors (Other Than the Mycobionts)mentioning

confidence: 99%

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Germination and seedling establishment in orchids: a complex of requirements

Rasmussen

Dixon

Jersáková

et al. 2015

Ann Bot

249

200

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A better understanding of germination and seedling establishment is needed for conservation of orchid populations. Due to the obligate association with a mycobiont, the germination niches in orchid species are extremely complex and varied. Microsites suitable for germination can be small and transient, and direct observation is difficult. An experimental approach using several levels of environmental manipulation/control is recommended.

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Section: Abiotic Factorsmentioning

confidence: 99%

Section: Biotic Factors (Other Than the Mycobionts)mentioning

confidence: 99%

Germination and seedling establishment in orchids: a complex of requirements

Rasmussen

Dixon

Jersáková

et al. 2015

Ann Bot

249

200

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“…The entry of mycelium through the micropyle into the degenerated suspensor of the embryo is one of the preferred pathways (Yeung et al 2019 ), ensures the 'planned' sequence of events, such as peloton formation, can occur, resulting in protocorm growth and development. In Caladenia tentaculate , the embryo produces a UV autofluorescing substance which gradually recedes towards the suspensor region near the micropyle (Wright et al 2005 ). Although the nature and function are unknown, this substance may interact with compatible mycorrhizal fungi, establishing symbiotic interactions.…”

Section: Seed Coat Functions During Seed Development and Germination ...mentioning

confidence: 99%

The orchid seed coat: a developmental and functional perspective

Lee,

Yeung

2023

Bot Stud

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Orchid seeds are 'dust-like.' The seed coat is usually thin, with only one to a few cell layers. It originates from the integuments formed during ovule development. In orchids, the outer integument is primarily responsible for forming a mature seed coat. The inner integument usually fails to develop after fertilization, becomes compressed, and collapses over the expanding embryo. Hence, the seed coat is formed from the funiculus, chalaza, and outer integumentary cells. The outermost layer of the seed coat, the testa, is lignified, usually at the radial and inner tangential walls. The subepidermal thin-walled layer(s), the tegmen, subsequently cold, resulting in seeds having only a single layer of seed coat cells. In some species, cells of the inner integument remain alive with the ability to synthesize and accumulate lipidic and or phenolic compounds in their walls covering the embryo. This cover is called the 'carapace,' a protective shield contributing to the embryo's added protection. A developmental and functional perspective of the integuments and seed coat during seed development and germination is presented in this review.

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“…On the other hand, pelotons were found in the epidermal cells of the protocorm when co-cultured with P. florida (Figure 4G), while only few pelotons in the protocorm were present when co-cultured with L. tigrinus (Figure 4D). Accordingly, the protocorm responds to the fungal hyphae that enters the embryo at the basal end by further development of rhizoid and epidermal cells, which act as a site of hyphal entry (Wright et al 2005;Yeung 2017), during which the enzymatic process takes place without alteration or degradation of the plant cell wall.…”

Section: Seedling Stagementioning

confidence: 99%

Symbiotic propagation of Dendrobium bigibbum Lindl. with selected saprophytic Basidiomycota

Bautista

Valentino

2023

Biodiversitas

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Abstract. Bautista NS, Valentino MJG. 2023. Symbiotic propagation of Dendrobium bigibbum Lindl. with selected saprophytic Basidiomycota. Biodiversitas 24: 3519-3527. Compatible mycorrhizal association of orchids with fungi is required for the germination and seedling development. In the present study, the mycorrhizal association of Dendrobium bigibbum with three species of saprophytic Basidiomycota, in particular, Volvariella volvacea, Lentinus tigrinus, and Pleurotus florida were evaluated. Co-culture technique was carried out during rhizoid and seedling development of D. bigibbum. Results revealed that the growth of D. bigibbum in rhizoid and seedling stages was enhanced when symbiotically grown with V. volvacea and L. tigrinus. D. bigibbum grown with V. volvacea had the highest mean length of the 1st leaf during the rhizoid stage. In seedling stage, V. volvacea and L. tigrinus significantly increased the growth of D. bigibbum in terms of length of 2nd leaf and fresh weight of the seedlings. For the length of root, increase in mean length was observed only in D. bigibbum co-cultured with L. tigrinus. In addition, the presence of peloton colonization was observed both in rhizoid and seedling stages. Thus, both V. volvacea and L. tigrinus formed compatible mycorrhizal association with D. bigibbum.

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Site amelioration for direct seeding of Caladenia tentaculata improves seedling recruitment and survival in natural habitat

Cited by 4 publications

References 6 publications

Germination and seedling establishment in orchids: a complex of requirements

Germination and seedling establishment in orchids: a complex of requirements

The orchid seed coat: a developmental and functional perspective

Symbiotic propagation of Dendrobium bigibbum Lindl. with selected saprophytic Basidiomycota

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