College of Chemistry and Life Science, Shenyang Normal University, Shenyang 110034, PR China.
Ecotoxicol Environ Saf. 2012 Apr;78:35-40. doi: 10.1016/j.ecoenv.2011.11.007. Epub 2011 Dec 3.
Endophyte infected and uninfected seedlings of rice (Oryza sativa L.) were subjected to five different levels of Na(2)CO(3) for 2 weeks. Under both Na(2)CO(3) stress as well as no stress, endophyte-infected plants were higher for above-ground dry weight and shoot length, but lower for root length compared to non-infected controls, and there was no significant difference for below-ground dry weight. Chlorophylls and carotenoid contents, net photosynetic rate, transpiration rate, catalase and peroxidase activities increased, but malondialdehyde content declined in the infected plants compared to non-infected controls under Na(2)CO(3) stress. Compared to non-infected controls, water use efficiency, stomatal conductance, chlorophyll fluorescence parameters (F(v)/F(m), F(v)/F(o)) and superoxide dismutase activity in infected plants increased under high concentrations of Na(2)CO(3) while there was no significant difference under low concentrations of Na(2)CO(3). Endophyte infection was concluded to be beneficial to the growth and antioxidative mechanisms in Oryza sativa under Na(2)CO(3) stress.
将受内生菌感染和未受内生菌感染的水稻（Oryza sativa L.）幼苗置于 5 种不同浓度的 Na(2)CO(3)下处理 2 周。在 Na(2)CO(3)胁迫和非胁迫条件下，与未感染对照相比，受内生菌感染的植株地上部干重和苗长较高，但根长较低，地下部干重则无显著差异。与未感染对照相比，受内生菌感染的植株在 Na(2)CO(3)胁迫下的叶绿素和类胡萝卜素含量、净光合速率、蒸腾速率、过氧化氢酶和过氧化物酶活性增加，而丙二醛含量下降。与未感染对照相比，在高浓度 Na(2)CO(3)下，受内生菌感染的植株的水分利用效率、气孔导度、叶绿素荧光参数（F(v)/F(m)、F(v)/F(o)）和超氧化物歧化酶活性增加，而在低浓度 Na(2)CO(3)下则无显著差异。内生菌感染被认为有利于水稻在 Na(2)CO(3)胁迫下的生长和抗氧化机制。
