Differential Effects of Pseudomonas mendocina and Glomus intraradices on Lettuce Plants Physiological Response and Aquaporin PIP2 Gene Expression Under Elevated Atmospheric CO2 and Drought

被引:35
作者
del Mar Alguacil, Maria [1 ]
Kohler, Josef [1 ]
Caravaca, Fuensanta [1 ]
Roldan, Antonio [1 ]
机构
[1] Ctr Edafol & Biol Aplicada Segura, CSIC, Dept Soil & Water Conservat, Murcia 30100, Spain
关键词
ARBUSCULAR MYCORRHIZAL SYMBIOSIS; PLASMA-MEMBRANE AQUAPORINS; GROWTH-PROMOTING RHIZOBACTERIA; GLOBAL CLIMATE-CHANGE; ROOT WATER-UPTAKE; OSMOTIC-STRESS; MESSENGER-RNA; SALT STRESS; TOLERANCE; FUNGI;
D O I
10.1007/s00248-009-9544-6
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Arbuscular mycorrhizal (AM) symbiosis and plant-growth-promoting rhizobacterium (PGPR) can alleviate the effects of water stress in plants, but it is unknown whether these benefits can be maintained at elevated CO2. Therefore, we carried out a study where seedlings of Lactuca sativa were inoculated with the AM fungus (AMF) Glomus intraradices N.C. Schenk & G.S. Sm. or the PGPR Pseudomonas mendocina Palleroni and subjected to two levels of watering and two levels of atmospheric CO2 to ascertain their effects on plant physiological parameters and gene expression of one PIP aquaporin in roots. The inoculation with PGPR produced the greatest growth in lettuce plants under all assayed treatments as well as the highest foliar potassium concentration and leaf relative water content under elevated [CO2] and drought. However, under such conditions, the PIP2 gene expression remained almost unchanged. G. intraradices increased significantly the AMF colonization, foliar phosphorus concentration and leaf relative water content in plants grown under drought and elevated [CO2]. Under drought and elevated [CO2], the plants inoculated with G. intraradices showed enhanced expression of the PIP2 gene as compared to P. mendocina or control plants. Our results suggest that both microbial inoculation treatments could help to alleviate drought at elevated [CO2]. However, the PIP2 gene expression was increased only by the AMF but not by the PGPR under these conditions.
引用
收藏
页码:942 / 951
页数:10
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