Mitochondrial genome of the nonphotosynthetic mycoheterotrophic plant Hypopitys monotropa, its structure, gene expression and RNA editing

被引:18
作者
Shtratnikoya, Viktoria Yu [1 ]
Schelkunov, Mikhail, I [2 ,3 ]
Penin, Aleksey A. [3 ]
Logacheva, Maria D. [2 ]
机构
[1] Lomonosov Moscow State Univ, AN Belozersky Inst Physicochem Biol, Moscow, Russia
[2] Skolkovo Inst Sci & Technol, Moscow, Russia
[3] Russian Acad Sci, Lab Plant Genom, Inst Informat Transmiss Problems, Moscow, Russia
来源
PEERJ | 2020年 / 8卷
基金
俄罗斯科学基金会;
关键词
Mitochondrial genome; Mycoheterotrophic plants; Hypopitys monotropa; RNA editing; Non-photosynthetic plants; GROUP-I INTRON; HORIZONTAL TRANSFER; PARASITIC PLANT; PLASTID GENOME; MESSENGER-RNA; EVOLUTION; SEQUENCE; FREQUENT; NUCLEAR; TRANSCRIPTOME;
D O I
10.7717/peerj.9309
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Heterotrophic plants-plants that have lost the ability to photosynthesize-are characterized by a number of changes at all levels of organization. Heterotrophic plants are divided into two large categories-parasitic and mycoheterotrophic (MHT). The question of to what extent such changes are similar in these two categories is still open. The plastid genomes of nonphotosynthetic plants are well characterized, and they exhibit similar patterns of reduction in the two groups. In contrast, little is known about the mitochondrial genomes of MHT plants. We report the structure of the mitochondrial genome of Hypopitys monotropa, a MHT member of Ericaceae, and the expression of its genes. In contrast to its highly reduced plastid genome, the mitochondrial genome of H. mono tropa is larger than that of its photosynthetic relative Vaccinium macrocarpon, and its complete size is similar to 810 Kb. We observed an unusually long repeat-rich structure of the genome that suggests the existence of linear fragments. Despite this unique feature, the gene content of the H. monotropa mitogenome is typical of flowering plants. No acceleration of substitution rates is observed in mitochondrial genes, in contrast to previous observations in parasitic non-photosynthetic plants. Transcriptome sequencing revealed the trans-splicing of several genes and RNA editing in 33 of 38 genes. Notably, we did not find any traces of horizontal gene transfer from fungi, in contrast to plant parasites, which extensively integrate genetic material from their hosts.
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页数:23
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