Microorganisms (AMF and PSB) interaction on linseed productivity under water-deficit condition

The relationship between arbuscular mycorrhizal fungi (AMF) and their associated bacteriacan be has great importance for sustainable agriculture especially in the case of highlymycorrhizal plants such as linseed. To evaluate the possible effect of AMF in association withphosphate solubilizing bacteria (PSB) on linseed plants, a 2-yr factorial experiment wasconducted based on a randomized complete block design with three replications at UrmiaUniversity, Urmia, Iran (37° 39′ 24.82″ N 44° 58′ 12.42″ E). The treatments included two AMFspecies (Glomus mosseae, G. intraradices and non-mycorrhizal control), PSB (Pseudomonasputida P13 and non-inoculated control) and various irrigation regimes (irrigation after 60, 120and 180 mm of evaporation from Class A pan). A significant increase in mycorrhizal linseedplants yield indicated the effectiveness of the two AMF species more than bacterial inoculation.The cumulative (second year) soil spores were maximally observed in mycorrhizal (single AMFand dually inoculation) treatments. The reduction in bacterial population was found with anincrease in water deficit. Dual infections caused an increase in leaf P content more than the onein PSB and AMF inoculations. Drought stress-induced yield reduction in seed and in oil wassignificantly compensated by mycorrhizal symbiosis for all irrigation levels. We found over25% increase for seed yield and 30% for oil yield in mycorrhizal plants as well as co-inoculatedplants. The yields improvements in mycorrhizal treatments (single and dually inoculated)leading to the highest water use efficiency.

کلیدواژه ها:

Irrigation ، Linseed ، Mycorrhizae ، Spore density ، Water use efficiency