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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/04/13 14:02:00」(JST)

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Weraroa novae-zelandiae, a secotioid form of the bluing Psilocybe

Secotioid fungi are an intermediate growth form between mushroom-like hymenomycetes and closed bag-shaped gasteromycetes, where an evolutionary process of gasteromycetation has started but not run to completion. Secotioid fungi may or may not have opening caps, but in any case they often lack the vertical geotropic orientation of the hymenophore needed to allow the spores to be dispersed by wind, and the basidiospores are not forcibly discharged or otherwise prevented from being dispersed (e.g. gills completely inclosed and never exposed as in the secotioid form of Lentinus tigrinus)—note—some mycologists do not consider a species to be secotioid unless it has lost ballistospory.^[1]

Explanation of secotioid development and gasteromycetation

Historically agarics and boletes (which bear their spores on a hymenium of gills or tubes respectively) were classified quite separately from the gasteroid fungi, such as puff-balls and truffles, of which the spores are formed in a large mass enclosed in an outer skin. However, in spite of this apparently very great difference in form, recent mycological research, both at microscopic^[2] and molecular^[3] level has shown that sometimes species of open mushrooms are much more closely related to particular species of gasteroid fungi than they are to each other. Fungi which do not open up to let their spores be dispersed in the air, but which show a clear morphological relation to agarics or boletes, constitute an intermediate form and are called secotioid.^[2]

The word is derived from the name of the genus Secotium, which contains such species.^[4]

On a microscopic scale, secotioid fungi do not expel their spores forcibly from the basidium and so the spores are statismospores. Like gasteroid fungi, secotioid ones rely on animals such as rodents or insects to distribute their spores.

It seems that sometimes it can be disadvantageous for a mushroom to open up and free its spores in the usual way. If this development is aborted, a secotioid form arises, perhaps to be followed eventually by an evolutionary progression to a fully gasteroid form. This type of progression is called gasteromycetation and seems to have happened several times independently starting from various genera of "normal" mushrooms. This means that the secotioid and also the gasteroid fungi are polyphyletic. According to the paper by Thiers,^[2] in certain climates and certain seasons, it may be an advantage to remain closed because moisture can be conserved in that way.

There is a spectrum of secotioid species ranging from the open form to the closed form in the following respects:

there may be an evident stipe, or there may be only a remnant consisting of a column of non-fertile tissue,
if there is a stipe the edge of the cap may separate from it (partially opening), or may not,
there may be recognizable gills (though oriented in all directions and very convoluted), or the fertile interior may be uniform like the gleba of gasteroid fungi, and
the spore-bearing tissue may be above ground (epigeous), or underground (hypogeous), or partly buried.

The adjective "sequestrate" is sometimes used as a general term to mean "either secotioid or gasteroid".

Examples

Cross-section of Hymenogaster tener

For example, the secotioid genus Hymenogaster has been shown to be closely related to agaric genera such as Hebeloma, which were formerly placed in family Cortinariaceae or Strophariaceae. This is found by DNA analysis and also indicated on a microscopic scale by the resemblance of the spores and basidia. According to a current classification system, Hebeloma now belongs to family Hymenogastraceae, and is considered more narrowly related to the closed Hymenogaster fungi than, for instance, to the ordinary mushrooms in genus Cortinarius.^[5]^[6]

A similar case is the well-known "Deceiver" mushroom Laccaria laccata which is now classified in the Hydnangiaceae, Hydnangium being a gastroid genus.

Cortinarius is a very widespread genus of agarics, but also contains some secotioid species, such as C. leucocephalus, C. coneae and C. cartilagineus.

Secotioid genus Nivatogastrium corresponds to agaric genus Pholiota^[2] and provides a vivid example of the phenomenon.^[7]

It has been found that a change in a single locus of a gene of the gilled mushroom Lentinus tigrinus causes it to have a closed fruiting body. This suggests that the emergence of a secotioid species may not require many mutations.^[3]

Gastroboletus is a secotioid bolete genus where the fruiting bodies may or may not open, but in any case the tubes are not aligned vertically as in a true bolete.^[2]

Agaricus deserticola is a secotioid species of Agaricus (the genus of common cultivated mushrooms) which at one time was placed in the genus Secotium. Similarly, Agaricus inapertus was formerly known as Endoptychum depressum until molecular analysis revealed it to be closely aligned with Agaricus.^[8]

References

^ Hibett DS, Tsuneda A, Shigeyuki M. (1994). "The Secotioid Form of Lentinus tegrinus:Genetics and Development of a Fungal Morphological Innovation.". American Journal of Botany 81 (4): 466–478. doi:10.2307/2445497.
^ ^a ^b ^c ^d ^e The following 1984 article provides a good introduction to sectioid fungi: "The Secotioid Syndrome" (PDF). Mycologia (New York: The New York Botanical Garden, Bronx. NY 10458) 76 (1): 1–8. January–February 1984. doi:10.2307/3792830.
^ ^a ^b "Evolution of gilled mushrooms and puffballs inferred from ribosomal DNA sequences". PNAS (Washington DC: National Academy of Sciences of the United States of America) 94 (22): 12002–12006. 1997-10-28. doi:10.1073/pnas.94.22.12002. PMC 23683. PMID 9342352.
^ "The Structure and Development of Secotium agaricoides" (PDF). Mycologia (New York: The New York Botanical Garden, Bronx. NY 10458) 7 (2): 94–104. March 1915. doi:10.2307/3753132.
^ "Derivation of a polymorphic lineage of Gasteromycetes from boletoid ancestors". Mycologia (New York: The New York Botanical Garden, Bronx. NY 10458) 94 (1): 85–98. 2002. doi:10.2307/3761848. PMID 21156480.
^ "Historical and current perspectives in the systematics of Australian cortinarioid sequestrate (truffle-like) fungi." (PDF). Australasian Mycologist 21 (3): 81–116. 2002.
^ See this Mykoweb page of Nivatogastrium nubigenum, which shows rudimentary lamellae.
^ Vellinga EC, de Kok RPJ, Bruns TD. (2003). "Phylogeny and taxonomy of Macrolepiota (Agaricaceae)". Mycologia 95 (3): 442–56. doi:10.2307/3761886. PMID 21156633.

English Journal

Architectural RNAs (arcRNAs): A class of long noncoding RNAs that function as the scaffold of nuclear bodies.

Chujo T1, Yamazaki T1, Hirose T2.
Biochimica et biophysica acta.Biochim Biophys Acta.2016 Jan;1859(1):139-46. doi: 10.1016/j.bbagrm.2015.05.007. Epub 2015 Jun 3.
Mammalian transcriptome analyses elucidated the presence of thousands of unannotated long noncoding RNAs (lncRNAs) with distinct transcriptional units. Molecular characterization and functional classification of these lncRNAs are important challenges in the next decade. A subset of these lncRNAs is
PMID 26021608

β-CD-dextran polymer for efficient sequestration of cholesterol from phospholipid bilayers: Mechanistic and safe-toxicity investigations.

Stelzl D1, Nielsen TT2, Hansen T3, di Cagno M4.
International journal of pharmaceutics.Int J Pharm.2015 Dec 30;496(2):896-902. doi: 10.1016/j.ijpharm.2015.10.041. Epub 2015 Oct 23.
The aim of this work was to investigate the suitability of β-cyclodextrin-dextran (BCD-dextran) polymer as cholesterol sequestering agent in vitro. For this purpose, BCD-dextran-cholesterol complexation was studied by phase solubility studies as well as with a specifically designed in vitro model b
PMID 26477291

Tolerance to silver of an Aspergillus fumigatus strain able to grow on cyanide containing wastes.

Sabatini L1, Battistelli M2, Giorgi L3, Iacobucci M2, Gobbi L4, Andreozzi E1, Pianetti A1, Franchi R3, Bruscolini F5.
Journal of hazardous materials.J Hazard Mater.2015 Dec 10;306:115-123. doi: 10.1016/j.jhazmat.2015.12.014. [Epub ahead of print]
We studied the strategy of an Aspergillus fumigatus strain able to grow on metal cyanide wastes to cope with silver. The tolerance test revealed that the Minimum Inhibitory Concentration of Ag(I) was 6mM. In 1mM AgNO3 aqueous solution the fungus was able to reduce and sequestrate silver into the cel
PMID 26705888

Japanese Journal

Influence of increasing temperature and nitrogen input on greenhouse gas emissions from a desert steppe soil in Inner Mongolia(Soil biology)

WANG Zhongwu,HAO Xiying,SHAN Dan,HAN Guodong,ZHAO Mengli,WILLMS Walter D.,WANG Zhen,HAN Xiong
Soil science and plant nutrition 57(4), 508-518, 2011-08
… At an average CH_4 consumption rate of 31.65μg Cm^<-2>h^<-1>, the 30.73 million ha of desert steppe soil in Inner Mongolia can consume (sequestrate) about 85×10^6kg CH_4-C, an offset equivalent to 711×10^6kg CO_2-C emissions annually. …
NAID 110009327338

Influence of crop rotation system on the spatial and temporal variation of the soil organic carbon budget in northern Kazakhstan(Environment)

TAKATA Yusuke,FUNAKAWA Shinya,YANAI Junta,MISHIMA Azusa,AKSHALOV Kanat,ISHIDA Norio,KOSAKI Takashi
Soil science and plant nutrition 54(1), 159-171, 2008-02
… however, the results indicated that fallow-based and barley-based crop rotation systems were depletive and conversion of the wheat-fallow system to continuous wheat cropping would sequestrate 0.1-0.3Mg ha^<-1> …
NAID 110007326839

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