The Rhizobium sp. strain NGR234 systemically suppresses arbuscular mycorrhizal root colonization in a split-root system of barley (Hordeum vulgare)

被引：10

作者：

Khaosaad, Thanasan ^{[2
]}

Staehelin, Christian ^{[3
]}

Steinkellner, Siegrid ^{[1
]}

Hage-Ahmed, Karin ^{[1
]}

Antonio Ocampo, Juan ^{[4
]}

Manuel Garcia-Garrido, Jose ^{[4
]}

Vierheilig, Horst ^{[1
,4
]}

机构：

[1] Univ Nat Resources & Appl Life Sci Vienna, Inst Pflanzenschutz DAPP, A-1190 Vienna, Austria

[2] Ramkhamhang Univ, Dept Biotechnol, Fac Sci, Bangkok 10240, Thailand

[3] Sun Yat Sen Zhongshan Univ, Sch Life Sci, State Key Lab Biocontrol, Guangzhou 510006, Guangdong, Peoples R China

[4] CSIC, Dept Microbiol Suelos, Estac Expt Zaidin, E-18008 Granada, Spain

来源：

PHYSIOLOGIA PLANTARUM | 2010年 / 140卷 / 03期

关键词：

GROWTH-PROMOTING RHIZOBACTERIA; ENDOGENOUS SALICYLIC-ACID; NODULATION FACTORS; SEED TREATMENT; III SECRETION; PLANT; SYMBIOSIS; LEGUMES; RICE; LEGUMINOSARUM;

D O I：

10.1111/j.1399-3054.2010.01396.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Nitrogen-fixing bacteria (rhizobia) form a nodule symbiosis with legumes, but also induce certain effects on non-host plants. Here, we used a split-root system of barley to examine whether inoculation with Rhizobium sp. strain NGR234 on one side of a split-root system systemically affects arbuscular mycorrhizal (AM) root colonization on the other side. Mutant strains of NGR234 deficient in Nod factor production (strain NGR delta nodABC), perception of flavonoids (strain NGR delta nodD1) and secretion of type 3 effector proteins (strain NGRrhcN) were included in this study. Inoculation resulted in a systemic reduction of AM root colonization with all tested strains. However, the suppressive effect of strain NGRrhcN was less pronounced. Moreover, levels of salicylic acid, an endogenous molecule related to plant defense, were increased in roots challenged with rhizobia. These data indicate that barley roots perceived NGR234 and that a systemic regulatory mechanism of AM root colonization was activated. The suppressive effect appears to be Nod factor independent, but enhanced by type 3 effector proteins of NGR234.

引用

页码：238 / 245

页数：8