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Ericoid mycorrhizas in organic subst...

Rains, Kai Coshow.

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Ericoid mycorrhizas in organic substrates: Distribution of ericoid mycorrhizas among epiphytes in a Costa Rican cloud forest and uptake of organic nitrogen by ericoid, ecto-, and arbuscular mycorrhizal pygmy forest plants.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Ericoid mycorrhizas in organic substrates: Distribution of ericoid mycorrhizas among epiphytes in a Costa Rican cloud forest and uptake of organic nitrogen by ericoid, ecto-, and arbuscular mycorrhizal pygmy forest plants./
Author:	Rains, Kai Coshow.
Description:	127 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4385.
Contained By:	Dissertation Abstracts International65-09B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3148494
ISBN:	0496075306

Ericoid mycorrhizas in organic substrates: Distribution of ericoid mycorrhizas among epiphytes in a Costa Rican cloud forest and uptake of organic nitrogen by ericoid, ecto-, and arbuscular mycorrhizal pygmy forest plants.
Rains, Kai Coshow.

Ericoid mycorrhizas in organic substrates: Distribution of ericoid mycorrhizas among epiphytes in a Costa Rican cloud forest and uptake of organic nitrogen by ericoid, ecto-, and arbuscular mycorrhizal pygmy forest plants. - 127 p.

Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4385.

Thesis (Ph.D.)--University of California, Davis, 2004.

The success of Ericaceae in organic substrates worldwide is frequently attributed to the exceptional ability of ericoid mycorrhizal (ERM) fungi to acquire organic N. However, much of the supporting research has been conducted in axenic laboratory conditions on boreal and arctic species. I investigated the occurrence and morphology of ericoid mycorrhizas in a neotropical forest and assessed the ability of temperate ERM species rooted in soils to acquire intact organic N (glycine-2 13C, 15N) and to acquire N from 15N-enriched litter. Co-occurring arbuscular mycorrhizal (AM) and ectomycorrhizal (EM) species were included for comparison.

ISBN: 0496075306Subjects--Topical Terms:

1017726
Biology, Ecology.

Ericoid mycorrhizas in organic substrates: Distribution of ericoid mycorrhizas among epiphytes in a Costa Rican cloud forest and uptake of organic nitrogen by ericoid, ecto-, and arbuscular mycorrhizal pygmy forest plants.
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100 1 $a Rains, Kai Coshow. $3 1939946
245 1 0 $a Ericoid mycorrhizas in organic substrates: Distribution of ericoid mycorrhizas among epiphytes in a Costa Rican cloud forest and uptake of organic nitrogen by ericoid, ecto-, and arbuscular mycorrhizal pygmy forest plants.
300 $a 127 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-09, Section: B, page: 4385.
500 $a Chair: Caroline S. Bledsoe.
502 $a Thesis (Ph.D.)--University of California, Davis, 2004.
520 $a The success of Ericaceae in organic substrates worldwide is frequently attributed to the exceptional ability of ericoid mycorrhizal (ERM) fungi to acquire organic N. However, much of the supporting research has been conducted in axenic laboratory conditions on boreal and arctic species. I investigated the occurrence and morphology of ericoid mycorrhizas in a neotropical forest and assessed the ability of temperate ERM species rooted in soils to acquire intact organic N (glycine-2 13C, 15N) and to acquire N from 15N-enriched litter. Co-occurring arbuscular mycorrhizal (AM) and ectomycorrhizal (EM) species were included for comparison.
520 $a Terrestrial and epiphytic ericaceous species collected in a neotropical cloud forest (Costa Rica) hosted typical ERM structures, dark septate endophytes (DSE), and, unexpectedly, fungal mantles and pseudo-Hartig nets. This diversity supports the emerging hypothesis that multiple fungal species may occupy ericaceous roots concurrently. Non-ericaceous roots (Araceae, Clusiaceae, Piperaceae) were AM, DSE, or non-mycorrhizal.
520 $a EM pine and AM cypress native to temperate coniferous forests (Mendocino, California) acquired as much or more labile organic N applied to soils than did ERM shrubs. All species tested, AM cypress, ERM huckleberry, and ERM rhododendron, acquired intact organic N from glycine-2 13C, 15N applied to pygmy forest soil in pots. In a separate pot experiment, EM pine acquired more N from 15N-enriched pine root litter (low C/N and tannin concentration) applied to temperate soil than did ERM huckleberry. However, ERM species may be more adept at N acquisition from tannin-rich litter in soils and may suppress competition for N through production of tannin-rich foliage litter. The difference between litter-N acquisition by pines and huckleberries increased in favor of huckleberries as tannin concentration increased in the following order among litter types: pine roots < huckleberry roots < pine foliage < huckleberry foliage. Overall, huckleberry may create a positive feedback loop whereby huckleberry produces tannin-rich foliage litter, thus exacerbating inorganic N limitations and suppressing growth of non-ERM plants, which then results in a competitive advantage for ERM huckleberry. ERM species possess additional mechanisms, independent of litter quality, to suppress competition. When pines were grown with huckleberries, litter-N acquisition by pines was suppressed relative to huckleberry neighbors or to pines with pine neighbors.
590 $a School code: 0029.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Biology, Botany. $3 1017825
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710 2 0 $a University of California, Davis. $3 1018682
773 0 $t Dissertation Abstracts International $g 65-09B.
790 1 0 $a Bledsoe, Caroline S., $e advisor
790 $a 0029
791 $a Ph.D.
792 $a 2004
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