The gain of two chloroplast tRNA introns marks the green algal ancestors of land plants

Nature ◽  
1990 ◽  
Vol 345 (6272) ◽  
pp. 268-270 ◽  
Author(s):  
J. R. Manhart ◽  
J. D. Palmer
Keyword(s):  
Land Plants ◽  
Green Algal

scholarly journals Algal ancestor of land plants was preadapted for symbiosis

2015 ◽  
Vol 112 (43) ◽  
pp. 13390-13395 ◽  
Author(s):  
Pierre-Marc Delaux ◽  
Guru V. Radhakrishnan ◽  
Dhileepkumar Jayaraman ◽  
Jitender Cheema ◽  
Mathilde Malbreil ◽  
...  
Keyword(s):  
Root Colonization ◽  
Land Plant ◽  
Land Plants ◽  
Recent Common Ancestor ◽  
Mycorrhizal Symbiosis ◽  
Specific Expression ◽  
Symbiotic Associations ◽  
Most Recent Common Ancestor ◽  
Green Algal ◽  
Colonization Of Land

Colonization of land by plants was a major transition on Earth, but the developmental and genetic innovations required for this transition remain unknown. Physiological studies and the fossil record strongly suggest that the ability of the first land plants to form symbiotic associations with beneficial fungi was one of these critical innovations. In angiosperms, genes required for the perception and transduction of diffusible fungal signals for root colonization and for nutrient exchange have been characterized. However, the origin of these genes and their potential correlation with land colonization remain elusive. A comprehensive phylogenetic analysis of 259 transcriptomes and 10 green algal and basal land plant genomes, coupled with the characterization of the evolutionary path leading to the appearance of a key regulator, a calcium- and calmodulin-dependent protein kinase, showed that the symbiotic signaling pathway predated the first land plants. In contrast, downstream genes required for root colonization and their specific expression pattern probably appeared subsequent to the colonization of land. We conclude that the most recent common ancestor of extant land plants and green algae was preadapted for symbiotic associations. Subsequent improvement of this precursor stage in early land plants through rounds of gene duplication led to the acquisition of additional pathways and the ability to form a fully functional arbuscular mycorrhizal symbiosis.

The Green Algal Ancestry of Land Plants as Revealed by the Chloroplast Genome

2007 ◽  
Vol 168 (5) ◽  
pp. 679-689 ◽  
Author(s):  
Monique Turmel ◽  
Jean‐François Pombert ◽  
Patrick Charlebois ◽  
Christian Otis ◽  
Claude Lemieux
Keyword(s):  
Chloroplast Genome ◽  
Land Plants ◽  
Green Algal

scholarly journals A contemplation on the secondary origin of green algal and plant plastids

2014 ◽  
Vol 83 (4) ◽  
pp. 331-336 ◽  
Author(s):  
Eunsoo Kim ◽  
Shinichiro Maruyama
Keyword(s):  
Land Plants ◽  
Single Origin ◽  
Phylogenetic Studies ◽  
Green Algal ◽  
Secondary Origin ◽  
Primary Plastid ◽  
Evolutionary Studies ◽  
New Hypothesis ◽  
Existing Data ◽  
Lines Of Evidence

A single origin of plastids and the monophyly of three “primary” plastid-containing groups – the Chloroplastida (or Viridiplantae; green algae+land plants), Rhodophyta, and Glaucophyta – are widely accepted, mainstream hypotheses that form the basis for many comparative evolutionary studies. This “Archaeplastida” hypothesis, however, thus far has not been unambiguously confirmed by phylogenetic studies based on nucleocytoplasmic markers. In view of this as well as other lines of evidence, we suggest the testing of an alternate hypothesis that plastids of the Chloroplastida are of secondary origin. The new hypothesis is in agreement with, or perhaps better explains, existing data, including both the plastidal and nucleocytoplasmic characteristics of the Chloroplastida in comparison to those of other groups.

scholarly journals Antenna arrangement and energy-transfer pathways of PSI–LHCI from the moss Physcomitrella patens

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Qiujing Yan ◽  
Liang Zhao ◽  
Wenda Wang ◽  
Xiong Pi ◽  
Guangye Han ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Physcomitrella Patens ◽  
Excitation Energy Transfer ◽  
Land Plant ◽  
Light Energy ◽  
Land Plants ◽  
Structural Basis ◽  
Light Harvesting Complex ◽  
Photosynthetic Organisms ◽  
Green Algal

AbstractPlants harvest light energy utilized for photosynthesis by light-harvesting complex I and II (LHCI and LHCII) surrounding photosystem I and II (PSI and PSII), respectively. During the evolution of green plants, moss is at an evolutionarily intermediate position from aquatic photosynthetic organisms to land plants, being the first photosynthetic organisms that landed. Here, we report the structure of the PSI–LHCI supercomplex from the moss Physcomitrella patens (Pp) at 3.23 Å resolution solved by cryo-electron microscopy. Our structure revealed that four Lhca subunits are associated with the PSI core in an order of Lhca1–Lhca5–Lhca2–Lhca3. This number is much decreased from 8 to 10, the number of subunits in most green algal PSI–LHCI, but the same as those of land plants. Although Pp PSI–LHCI has a similar structure as PSI–LHCI of land plants, it has Lhca5, instead of Lhca4, in the second position of Lhca, and several differences were found in the arrangement of chlorophylls among green algal, moss, and land plant PSI–LHCI. One chlorophyll, PsaF–Chl 305, which is found in the moss PSI–LHCI, is located at the gap region between the two middle Lhca subunits and the PSI core, and therefore may make the excitation energy transfer from LHCI to the core more efficient than that of land plants. On the other hand, energy-transfer paths at the two side Lhca subunits are relatively conserved. These results provide a structural basis for unravelling the mechanisms of light-energy harvesting and transfer in the moss PSI–LHCI, as well as important clues on the changes of PSI–LHCI after landing.

scholarly journals Evidence-based green algal genomics reveals marine diversity and ancestral characteristics of land plants

BMC Genomics ◽  
2016 ◽  
Vol 17 (1) ◽  
Author(s):  
Marijke J. van Baren ◽  
Charles Bachy ◽  
Emily Nahas Reistetter ◽  
Samuel O. Purvine ◽  
Jane Grimwood ◽  
...  
Keyword(s):  
Land Plants ◽  
Evidence Based ◽  
Green Algal ◽  
Marine Diversity

scholarly journals Patterns of cell division in the filamentous Desmidiaceae, close green algal relatives of land plants

2008 ◽  
Vol 95 (6) ◽  
pp. 643-654 ◽  
Author(s):  
John D. Hall ◽  
Richard M. McCourt ◽  
Charles F. Delwiche
Keyword(s):  
Cell Division ◽  
Land Plants ◽  
Green Algal

Blue-green algal flora on the rock surface of temples and monuments of India

1999 ◽  
Vol 110 (1-2) ◽  
pp. 133-144
Author(s):  
P. Tripathy ◽  
A. Roy ◽  
N. Anand ◽  
S. P. Adhikary
Keyword(s):  
Rock Surface ◽  
Algal Flora ◽  
Green Algal
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