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Degeneration of photosynthetic capacity in mixotrophic plants, Chimaphila japonica and Pyrola decorata (Ericaceae)

The evolution of photosynthesis is an important feature of mixotrophic plants. Previous inferences proposed that mixotrophic taxa tend to retain most genes relating to photosynthetic functions but vary in plastid gene content. However, no sequence data are available to test this hypothesis in Ericac...

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Autores principales: Yu, Jiaojun, Wang, Chaobo, Gong, Xun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: KeAi Publishing 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6112300/
https://www.ncbi.nlm.nih.gov/pubmed/30159495
http://dx.doi.org/10.1016/j.pld.2016.11.005
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author Yu, Jiaojun
Wang, Chaobo
Gong, Xun
author_facet Yu, Jiaojun
Wang, Chaobo
Gong, Xun
author_sort Yu, Jiaojun
collection PubMed
description The evolution of photosynthesis is an important feature of mixotrophic plants. Previous inferences proposed that mixotrophic taxa tend to retain most genes relating to photosynthetic functions but vary in plastid gene content. However, no sequence data are available to test this hypothesis in Ericaceae. To investigate changes in plastid genomes that may result from a transition from autotrophy to mixotrophy, the plastomes of two mixotrophic plants, Pyrola decorata and Chimaphila japonica, were sequenced at Illumina's Genome Analyzer and compared to the published plastome of the autotrophic plant Rhododendron simsii, which also belongs to Ericaceae. The greatest discrepancy between mixotrophic and autotrophic plants was that ndh genes for both P. decorata and C. japonica plastomes have nearly all become pseudogenes. P. decorata and C. japonica also retained all genes directly involved in photosynthesis under strong selection. The calculated rate of nonsynonymous nucleotide substitutions and synonymous substitutions of protein-coding genes (dN/dS) showed that substitution rates in shade plants were apparently higher than those in sunlight plants. The two mixotrophic plastomes were generally very similar to that of non-parasitic plants, although ndh genes were largely pseudogenized. Photosynthesis genes under strong selection were retained in the two mixotrophs, however, with greatly increased substitution rates. Further research is needed to gain a clearer understanding of the evolution of autotrophy and mixotrophy in Ericaceae.
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spelling pubmed-61123002018-08-29 Degeneration of photosynthetic capacity in mixotrophic plants, Chimaphila japonica and Pyrola decorata (Ericaceae) Yu, Jiaojun Wang, Chaobo Gong, Xun Plant Divers Article The evolution of photosynthesis is an important feature of mixotrophic plants. Previous inferences proposed that mixotrophic taxa tend to retain most genes relating to photosynthetic functions but vary in plastid gene content. However, no sequence data are available to test this hypothesis in Ericaceae. To investigate changes in plastid genomes that may result from a transition from autotrophy to mixotrophy, the plastomes of two mixotrophic plants, Pyrola decorata and Chimaphila japonica, were sequenced at Illumina's Genome Analyzer and compared to the published plastome of the autotrophic plant Rhododendron simsii, which also belongs to Ericaceae. The greatest discrepancy between mixotrophic and autotrophic plants was that ndh genes for both P. decorata and C. japonica plastomes have nearly all become pseudogenes. P. decorata and C. japonica also retained all genes directly involved in photosynthesis under strong selection. The calculated rate of nonsynonymous nucleotide substitutions and synonymous substitutions of protein-coding genes (dN/dS) showed that substitution rates in shade plants were apparently higher than those in sunlight plants. The two mixotrophic plastomes were generally very similar to that of non-parasitic plants, although ndh genes were largely pseudogenized. Photosynthesis genes under strong selection were retained in the two mixotrophs, however, with greatly increased substitution rates. Further research is needed to gain a clearer understanding of the evolution of autotrophy and mixotrophy in Ericaceae. KeAi Publishing 2017-01-12 /pmc/articles/PMC6112300/ /pubmed/30159495 http://dx.doi.org/10.1016/j.pld.2016.11.005 Text en © 2017 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Article
Yu, Jiaojun
Wang, Chaobo
Gong, Xun
Degeneration of photosynthetic capacity in mixotrophic plants, Chimaphila japonica and Pyrola decorata (Ericaceae)
title Degeneration of photosynthetic capacity in mixotrophic plants, Chimaphila japonica and Pyrola decorata (Ericaceae)
title_full Degeneration of photosynthetic capacity in mixotrophic plants, Chimaphila japonica and Pyrola decorata (Ericaceae)
title_fullStr Degeneration of photosynthetic capacity in mixotrophic plants, Chimaphila japonica and Pyrola decorata (Ericaceae)
title_full_unstemmed Degeneration of photosynthetic capacity in mixotrophic plants, Chimaphila japonica and Pyrola decorata (Ericaceae)
title_short Degeneration of photosynthetic capacity in mixotrophic plants, Chimaphila japonica and Pyrola decorata (Ericaceae)
title_sort degeneration of photosynthetic capacity in mixotrophic plants, chimaphila japonica and pyrola decorata (ericaceae)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6112300/
https://www.ncbi.nlm.nih.gov/pubmed/30159495
http://dx.doi.org/10.1016/j.pld.2016.11.005
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