Aeroterrestrial<i>Coleochaete</i>(Streptophyta, Coleochaetales) models early plant adaptation to land

Graham, Linda E.; Arancibia-Ávila, Patricia; Taylor, Wilson A.; Strother, Paul K.; Cook, Martha E.

doi:10.3732/ajb.1100245

Cited by 54 publications

(45 citation statements)

References 106 publications

(151 reference statements)

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“…The remaining extant orders of charophyte algae ended up secondarily aquatic where they were able to compete more effectively than on land (Stebbins and Hill 1980). Although this idea is difficult to test directly, the finding that a nominally aquatic charophyte species, Coleochaete orbicularis, can grow in terrestrial environments and even show adaptive changes in body plan under these conditions supports this idea (Graham et al 2012). It has also been argued that early streptophytes were preadapted to the colonization of land by being the first algal group to conquer freshwater habitats, whereas chlorophyte algae, which predominate in marine environments, moved into freshwater much later (Becker and Marin 2009).…”

Section: Overviewsupporting

confidence: 61%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

107

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The green lineage of chlorophyte algae and streptophytes form a large and diverse clade with multiple independent transitions to produce multicellular and/or macroscopically complex organization. In this review, I focus on two of the best-studied multicellular groups of green algae: charophytes and volvocines. Charophyte algae are the closest relatives of land plants and encompass the transition from unicellularity to simple multicellularity. Many of the innovations present in land plants have their roots in the cell and developmental biology of charophyte algae. Volvocine algae evolved an independent route to multicellularity that is captured by a graded series of increasing cell-type specialization and developmental complexity. The study of volvocine algae has provided unprecedented insights into the innovations required to achieve multicellularity.

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Section: Overviewsupporting

confidence: 61%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

107

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“…Responses of erect axial gametophores of the moss Sphagnum compactum, dorsiventral thalloid liverworts Blasia pusilla and Marchantia polymorpha, and the dorsiventral aquaticgrown streptophyte alga Coleochaete orbicularis were studied. 5,26 The thalloid liverwort species were also employed to test a second hypothesis that direction of white light illumination is not more important than surface contact in controlling orientation of mature gametophytes. In addition, the axial gametophores of Sphagnum moss were used to examine the effects of directional illumination under supersaturating (high fluence) levels of photosynthetically active radiation.…”

Section: Introductionmentioning

confidence: 99%

Direction of illumination controls gametophyte orientation in seedless plants and related algae

Cardona-Correa

Ecker

Graham

2015

Plant Signaling & Behavior

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The environmental influences that determine dorsiventral or axial gametophyte orientation are unknown for most modern seedless plants. To fill this gap, an experimental laboratory system was employed to evaluate the relative effects of light direction and gravity on body orientation of the dorsiventral green alga Coleochaete orbicularis, and gametophytes of liverworts Blasia pusilla and Marchantia polymorpha, early-diverging moss Sphagnum compactum, and fern Ceratopteris richardii, the latter functioning as experimental control. Replicate clonal cultures were experimentally illuminated only from above, only from below, or from multiple directions, with the same near-saturation PAR level for periods brief enough to minimize nutrient limitation effects, and orientation of new growth was evaluated. For all species tested, direction of illumination exerted stronger control over gametophyte body orientation than gravity. When illuminated only from below: 1) axial Sphagnum gametophores that had initially grown into an overlying air space inverted growth by 180, burrowing into the substrate; 2) new growth of dorsiventral Blasia, Marchantia, and Ceratopteris gametophytes-whose ventral rhizoids initially penetrated agar substrate and dorsal surfaces initially faced overlying airspace-twisted 180 so that ventral surfaces bearing rhizoids faced overlying air space and rhizoids extended into the air; and 3) Coleochaete lost typical dorsiventral organization and diagnostic dorsal hairs. Direction of illumination also exerted stronger control over orientation of liverwort new growth than surface contact did. These results indicate that early land plants likely inherited light-directed gametophyte body orientation from ancestral streptophyte algae and suggest a mechanism for reorientation of gametophyte-dominant land plants after spatial disturbance.

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“…It is likely that the first organisms to transition from fully aquatic habitats to a subaerial existence were photosynthetic prokaryotes such as cyanobacteria, followed by fully aquatic eukaryotic algae adapted to life in muddy lake margins (Graham et al, 2012(Graham et al, , 2014. These algae occurred in organic-poor soils, with reduced accessibility to water and excess light, where they had to distinguish between subaerial and aquatic conditions and adjust their developmental processes and body morphology accordingly and reversibly (Graham et al, 2012(Graham et al, , 2014.…”

Section: Plant Evolution and Dtmentioning

confidence: 99%

“…These algae occurred in organic-poor soils, with reduced accessibility to water and excess light, where they had to distinguish between subaerial and aquatic conditions and adjust their developmental processes and body morphology accordingly and reversibly (Graham et al, 2012(Graham et al, , 2014. DT allowed these algae to more effectively adapt to habitats and periods of limited hydration.…”

Section: Plant Evolution and Dtmentioning

confidence: 99%

“…DT allowed these algae to more effectively adapt to habitats and periods of limited hydration. Therefore, DT evolved during the water-toland transition and was carried forward together with other physiological traits useful in terrestrial habitats, such as the production of resistant walls by vegetative cells, which reduce UV-and desiccation-induced cellular damage (Graham et al, 2012).…”

Section: Plant Evolution and Dtmentioning

confidence: 99%

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