Effects of arbuscular mycorrhizal fungi from different sources on the growth and physiology of Ardisia crenata

doi:10.3724/SP.J.1003.2010.083

Abstract

Abstract:

Ardisia crenata, a shrubby flowering plant native to East and Southeast Asia, is now invasive in southern USA and elsewhere. We used the trap culture method with A. crenata root fragments of as inocula to obtain host-associated arbuscular mycorrhizal (AM) fungi. AM fungi were obtained from the species’ invasive range in Texas, USA, and its’ native range in Dongguan in Guangdong Province, Emei Mountain in Sichuan Province and Xingshan in Hubei Province in China. The influences of these AM fungi from different sources on the growth and physiology of A. crenata were determined. Inoculation with all strains of AM fungi increased leaf area ratio (LAR) and relative growth rate (RGR), but did not influence net photosynthetic rate at saturated light (P_n), respiration rate (R_d), ratio of root to shoot (R/S), nitrogen and phosphorus concentration. There were some differences in the effects of AM fungi from different sources. AM fungi sourced from Dongguan in the native range and Texas in the invasive range had equal influence on A. crenata, being more stimulative than AM fungi from other sources. AM fungi sourced from the invasive range did not promote more growth of A. crenata than the combined AM fungi sourced from the native range. Therefore, we conclude that the effects of AM fungi may not be an important factor leading to higher density of A. crenata in invasive populations than in native populations.

Key words: arbuscular mycorrhizal fungi, invasion, leaf area ratio, relative growth rate, ‘enhanced mutualism’ hypothesis

Hongping Mu, Yizhu Chen, Honglin Cao, Wanhui Ye. Effects of arbuscular mycorrhizal fungi from different sources on the growth and physiology of Ardisia crenata[J]. Biodiv Sci, 2010, 18(1): 83-89.

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URL: https://www.biodiversity-science.net/EN/10.3724/SP.J.1003.2010.083

https://www.biodiversity-science.net/EN/Y2010/V18/I1/83

Figures/Tables 4

Table 1 Root colonization of Ardisia crenata inoculated with inocula of different sources and controls

来源 Source	处理 Treatment	侵染密度Infection density (%)	侵染率Infection rate (%)
德克萨斯州	Inoculated	59.34 ± 13.92	88 ± 6
TX	CK	0.10 ± 0.04	4 ± 2
东莞	Inoculated	63.53 ± 7.13	94 ± 2
DG	CK	1.38 ± 0.51	4 ± 2
兴山	Inoculated	65.86 ± 5.00	97 ± 3
XS	CK	0.29 ± 0.24	5 ± 3
峨眉山	Inoculated	83.07 ± 4.98	98 ± 2
EM	CK	1.87 ± 0.77	6 ± 2

Fig. 1 Light saturated photosynthetic rate (Pn, A) and dark respiration (Rd, B) of Ardisia crenata in response to arbuscular mycorrhizal inocula of different sources. ■ inoculated with inocula of different sources, □ parallel controls. Error bars represent +1 standard error. Different letters in the same figure indicate significant differences (Duncan test, P<0.05).

Fig. 2 Specific leaf area (SLA, A), leaf area ratio (LAR, B), relative growth rate (RGR, C) and root:shoot ratio (R/S, D) of Ardisia crenata in response to inocula of different sources. ■ inoculated with inocula of different sources, □ parallel controls. Error bars represent +1 standard error. Different letters in the same figure indicate significant differences (Duncan test, P<0.05).

Fig. 3 Phosphorus (A) and nitrogen (C) concentration in leaf and phosphorus (B) and nitrogen (D) content in whole plant of Ardisia crenata in response to inocula of different sources. ■ inoculated with inocula of different sources, □ parallel controls. Error bars represent +1 standard error. Different letters in the same figure indicate significant differences (Duncan test, P<0.05).

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