EFFECTS OF ARBUSCULAR MYCORRHIZAL FUNGI ON THE GROWTH AND ABSORPTION OF NITROGEN AND PHOSPHORUS IN CAMPTOTHECA ACUMINATA SEEDLINGS

doi:10.17521/cjpe.2006.0120

Abstract

Abstract:

Background and Aims Camptotheca acuminata is a special Chinese tree that produces camptothecin (CPT), a monoterpenoid indole alkaloid, which has gained great attention for its remarkable inhibitory activity against tumour cells.

Methods After 70-day growth period,seedlings were inoculated with the arbuscular mycorrhizal (AM) fungi, Glomus manihot (Gm), G. versiforme (Gv), G. etunicatum (Ge), G. diaphanum (Gd), Acaulospora mellea (Am) and A. laevis (Al), respectively.

Key Results We investigated the effects of six species of AM fungi, belonging to two genera, on the growth, absorption of nitrogen and phosphorus in C. acuminata seedlings grown in the greenhouse. All inoculated seedlings were infected by six AM fungi and formed arbuscular mycorrhiza. The seedling growth and nitrogen and phosphorus absorption were affected by the formation of arbuscular mycorrhiza in C. acuminata. The biomass of mycorrhizal seedlings was significantly higher than that of non-mycorrhizal seedlings. For most mycorrhizal seedlings, the ratio of root to shoot was larger than that of the control. Nitrogen contents in Gm, Gv, Ge and Al were significantly lower than in the control. In contrast, phosphorus contents in plant of all mycorrhizal seedlings were higher than in non-mycorrhizal seedlings. Arbuscular mycorrhizal formation also changed the allocation of nitrogen and phosphorus in different organs of seedlings.

Conclusions These patterns suggest that the symbiotic association between C. acuminata roots and AM fungi effectively maintains nutrient homeostasis through changes in physiological properties, including nutrient uptake and allocation.

Key words: Arbuscular mycorrhiza, Camptotheca acuminata seedlings, Biomass, Nitrogen and phosphorus contents

ZHAO Xin, YAN Xiu-Feng. EFFECTS OF ARBUSCULAR MYCORRHIZAL FUNGI ON THE GROWTH AND ABSORPTION OF NITROGEN AND PHOSPHORUS IN CAMPTOTHECA ACUMINATA SEEDLINGS[J]. Chin J Plant Ecol, 2006, 30(6): 947-953.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2006.0120

https://www.plant-ecology.com/EN/Y2006/V30/I6/947

Figures/Tables 4

References 37

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处理 Treatment	菌根侵染率(%) Mycorrhizal colonization rate	根系的菌根侵染强度(%) Mycorrhizal colonization intensity of root	侵染根段的菌根侵染强度(%) Mycorrhizal colonization intensity of infected root fragment
CK	0^a	0^a	0^a
Gm	83.18±8.75^b	56.22±5.87^b	67.47±6.77^b
Gv	84.54±9.03^b	53.30±5.37^b	63.96±6.59^b
Ge	88.54±9.03^c	33.61±3.31^c	40.33±4.03^c
Gd	74.15±8.12^d	41.36±4.06^d	49.63±5.13^d
Am	70.54±6.87^d	56.14±4.76^b	55.32±5.71^e
Al	49.01±5.81^e	26.72±2.34^e	32.04±2.95^f

处理 Treatment	菌根侵染率(%) Mycorrhizal colonization rate	根系的菌根侵染强度(%) Mycorrhizal colonization intensity of root	侵染根段的菌根侵染强度(%) Mycorrhizal colonization intensity of infected root fragment
CK	0^a	0^a	0^a
Gm	83.18±8.75^b	56.22±5.87^b	67.47±6.77^b
Gv	84.54±9.03^b	53.30±5.37^b	63.96±6.59^b
Ge	88.54±9.03^c	33.61±3.31^c	40.33±4.03^c
Gd	74.15±8.12^d	41.36±4.06^d	49.63±5.13^d
Am	70.54±6.87^d	56.14±4.76^b	55.32±5.71^e
Al	49.01±5.81^e	26.72±2.34^e	32.04±2.95^f

处理 Treatment	株高(cm) Height	生物量 Biomass				根冠比 Root/shoot ratio
处理 Treatment	株高(cm) Height	根系干重(g·plant^-1) Root dry weight	茎干重(g·plant^-1) Stem dry weight	叶干重(g·plant^-1) Leaf dry weight	全株干重(g·plant^-1) Whole plant dry weight	根冠比 Root/shoot ratio
CK	18.50^a	0.37^a	0.30^a	0.58^a	1.25^a	0.42^ab
Gm	19.14^a	0.51^b	0.34^a	0.62^a	1.47^b	0.53^b
Gv	16.80^a	0.64^c	0.29^a	0.57^a	1.50^b	0.75^c
Ge	19.53^a	0.35^a	0.29^a	0.52^a	1.16^a	0.43^ab
Gd	20.63^a	0.45^b	0.48^b	0.78^b	1.71^c	0.36^a
Am	20.13^a	0.88^d	0.56^c	0.96^c	2.40^d	0.58^bc
Al	18.27^a	0.48^b	0.32^a	0.48^a	1.29^ab	0.60^bc

处理 Treatment	株高(cm) Height	生物量 Biomass				根冠比 Root/shoot ratio
处理 Treatment	株高(cm) Height	根系干重(g·plant^-1) Root dry weight	茎干重(g·plant^-1) Stem dry weight	叶干重(g·plant^-1) Leaf dry weight	全株干重(g·plant^-1) Whole plant dry weight	根冠比 Root/shoot ratio
CK	18.50^a	0.37^a	0.30^a	0.58^a	1.25^a	0.42^ab
Gm	19.14^a	0.51^b	0.34^a	0.62^a	1.47^b	0.53^b
Gv	16.80^a	0.64^c	0.29^a	0.57^a	1.50^b	0.75^c
Ge	19.53^a	0.35^a	0.29^a	0.52^a	1.16^a	0.43^ab
Gd	20.63^a	0.45^b	0.48^b	0.78^b	1.71^c	0.36^a
Am	20.13^a	0.88^d	0.56^c	0.96^c	2.40^d	0.58^bc
Al	18.27^a	0.48^b	0.32^a	0.48^a	1.29^ab	0.60^bc