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70 results for “gametophyte”
Fig. 6. Homalia trichomanoides gametophore bud development. Day 148 in Preliminary Study Of Moss Homalia Trichomanoides (Hedw.) Brid. Gametophyte Development From Spores In Vitro
Fig. 6. Homalia trichomanoides gametophore bud development. Day 148 after inoculation (A) and day 158 after inoculation (B).
Polytrichum juniperinum (Polytrichaceae) - whole gametophyte - unspecified
Image of Polytrichum juniperinum (Polytrichaceae) - whole gametophyte - unspecified
Pleurochaete squarrosa (Pottiaceae) - whole gametophyte - unspecified
Image of Pleurochaete squarrosa (Pottiaceae) - whole gametophyte - unspecified
Pleurochaete squarrosa (Pottiaceae) - whole gametophyte - unspecified
Image of Pleurochaete squarrosa (Pottiaceae) - whole gametophyte - unspecified
Pleurochaete squarrosa (Pottiaceae) - whole gametophyte - unspecified
Image of Pleurochaete squarrosa (Pottiaceae) - whole gametophyte - unspecified
Isothecium myosuroides (Brachytheciaceae) - whole gametophyte - unspecified
Image of Isothecium myosuroides (Brachytheciaceae) - whole gametophyte - unspecified
Isothecium myosuroides (Brachytheciaceae) - whole gametophyte - unspecified
Image of Isothecium myosuroides (Brachytheciaceae) - whole gametophyte - unspecified
Isothecium myosuroides (Brachytheciaceae) - whole gametophyte - unspecified
Image of Isothecium myosuroides (Brachytheciaceae) - whole gametophyte - unspecified
Data from: Life cycle matters: DNA barcoding reveals contrasting community structure between fern sporophytes and gametophytes
Ferns are the only major lineage of vascular plants that have nutritionally independent sporophyte (diploid) and gametophyte (haploid) life stages. However, the implications of this unique life cycle for fern community ecology have rarely been considered. To compare patterns of community structure between fern sporophytes and gametophytes, we conducted a survey of the ferns of the islands of Moorea and Tahiti (French Polynesia). We first constructed a DNA barcode library (plastid rbcL and trnH–psbA) for the two island floras including 145 fern species. We then used these DNA barcodes to identify more than 1300 field-collected gametophytes from 25 plots spanning an elevational gradient from 200 to 2000 m. We found that species richness of fern sporophytes conforms to the well-known unimodal (i.e., mid-elevation peak) pattern, reaching a maximum at ca. 1000 – 1200 m. Moreover, we found that fern sporophyte communities become increasingly phylogenetically clustered at high elevations. In contrast, species richness of fern gametophytes was consistent across sites, and gametophytes showed no correlation of phylogenetic community structure with elevation. Turnover of sporophyte and gametophyte communities was closely linked with elevation at shallow phylogenetic levels, but not at deeper nodes in the tree. Finally, we found several species for which gametophytes had broader ranges than sporophytes, including a vittarioid fern with abundant gametophytes but extremely rare sporophytes. Our study highlights the importance of including diverse life history stages in surveys of community structure, and has implications for the possible impacts of climate change on the distribution of fern diversity.
Fig. 5. Homalia trichomanoides protonema day 127 in Preliminary Study Of Moss Homalia Trichomanoides (Hedw.) Brid. Gametophyte Development From Spores In Vitro
Fig. 5. Homalia trichomanoides protonema day 127 after inoculation.
Fig. 1 in Preliminary Study Of Moss Homalia Trichomanoides (Hedw.) Brid. Gametophyte Development From Spores In Vitro
Fig. 1. Homalia trichomanoides spores before inoculation.
Antheridiogen controls spatial dynamics of sex‐expression in naturally occurring gametophytes of the tree fern Cyathea multiflora
<p>Background and aims: Antheridiogen systems are an important and widespread mechanism by which sex expression is controlled and genetic diversity maintained in fern gametophyte populations. However, antheridiogens have rarely been studied outside of the laboratory and little is known about their function in natural populations. Combining predictions based on field and laboratory study, we document the sexual structure of tree fern gametophyte populations and test the effects of antheridiogen <em>in situ</em>. </p> <p>Key results: In all populations, sex ratios indirectly indicate antheridiogen activity. No hermaphroditic gametophytes were identified in any population. Female gametophytes are randomly distributed in each population while male gametophytes tend to cluster. In two of the populations, male sex expression is spatially dependent on females, providing direct evidence of antheridiogen function <em>in situ</em>.</p> <p>Conclusions: This study provides the first documentation of spatial sex expression in natural gametophyte populations of an antheridiogen-producing tree fern species. The profound impact of antheridiogen on gametophyte sex expression in field settings suggests this system is intimately tied to mating systems, fitness, and genetic diversity in <em>Cyathea multiflora</em>.</p>
Reproductive transcriptome of Nicotiana tabacum male gametophyte unveils decreasing number of new transcription factors during pollen ontogeny
<p>Plants with highly reduced male gametophytes represent a successful adaptation to sexual reproduction, which plays an important role in the colonization and radiation of terrestrial ecosystems. During pollen maturation, microsporocytes to mature pollen grain cells switch from mitosis to meiosis and ultimately form a haploid male gametophyte, a widely used model to study plant development. We performed RNASeq analysis of <em>Nicotiana tabacum</em> at six developmental stages from microspores to mature pollen grain to characterize in detail key transcription factor (TF) genes involved in pollen ontogeny. Our results provide the most complete transcriptomic data during pollen development in the important model plant <em>Nicotiana tabacum. </em>We have identified DEGs associated with six ontogenetic stages of the male gametophyte, providing insights into the molecular regulation of reproductive development by TFs that have a high potential for agronomic research investigating molecular networks associated with pollen sterility and related issues.</p>
Data from: Clonality, local population structure, and gametophyte sex ratios in cryptic species of the Sphagnum magellanicum complex
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Antheridiogen controls spatial dynamics of sex‐expression in naturally occurring gametophytes of the tree fern Cyathea multiflora
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Data from: Life cycle matters: DNA barcoding reveals contrasting community structure between fern sporophytes and gametophytes
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Data from: Breakdown of gametophytic self-incompatibility in subdivided populations
In many hermaphroditic flowering plants self-fertilization is prevented by self-incompatibility (SI), often controlled by a single locus, the S-locus. In single isolated populations, the maintenance of SI depends chiefly on inbreeding depression and the number of SI alleles at the S-locus. In subdivided populations, however, population subdivision has complicated effects on both the number of SI alleles and the level of inbreeding depression, rendering the maintenance of SI difficult to predict. Here, we explore the conditions for the invasion of a self-compatible mutant in a structured population. We find that the maintenance of SI is strongly compromised when a population becomes subdivided. We show that this effect is mainly caused by the decrease of the local diversity of SI alleles rather than by a change in the dynamics of inbreeding depression. Strikingly, we also find that the diversity of SI alleles at the whole population level is a poor predictor of the maintenance of SI. We discuss the implications of our results for the interpretation of empirical data on the loss of SI in natural populations.
Krieg et al. (2024) Fern gametophytes exhibit distinct patterns of niche exploration and global convergence in ecophysiological functioning
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Supplements - Apomictic fern fathers: An experimental approach to the reproductive characteristics of sexual, apomict and hybrid fern gametophytes
<p>Supplementary files for the article "Apomictic fern fathers: An experimental approach to the reproductive characteristics of sexual, apomict and hybrid fern gametophytes" published in American Journal of Botany</p>
Supporting Information - An experimental assessment of competitive interactions between sexual and apomictic fern gametophytes using Easy Leaf Area
<p>Supporting Information for the paper titled <strong>An experimental assessment of competitive interactions between sexual and apomictic fern gametophytes using Easy Leaf Area</strong> published in Applications in Plant Sciences.</p>
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