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Endophytic infection modulates ROS-scavenging systems and modifies cadmium distribution in rice seedlings exposed to cadmium stress
Theoretical and Experimental Plant Physiology ( IF 2.6 ) Pub Date : 2019-11-18 , DOI: 10.1007/s40626-019-00159-5
Lianju Ma , Xuemei Li , Lanlan Wang , Yueying Li , Ning Bu , Cuimei Yu

The relationship between endophytic infection and components of the Cd stress response was examined in the present study. Oryza sativa L. plants were grown in Hoagland’s nutrient solution with and without infection with the endophytic fungus JP4 under different cadmium (Cd) stress conditions (0, 50, 100, and 150 μM) for 2 weeks. Endophytic infection in the roots promoted rice seedling growth and decreased shoot Cd contents in comparison to non-infected treatments. Furthermore, the adsorbed Cd remained in the roots, and far less Cd was transported from the roots to the shoots. Compared to the non-infected rice seedlings, endophytic infection remarkably increased the pigment content, net photosynthetic rate (Pn), and chlorophyll fluorescence in all treatments, except for Fv/F0 values and chlorophyll b content in the 100 μM Cd treatment. Superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), and glutathione reductase (GR) activity, as well as ascorbic acid (AsA) and glutathione (GSH) content, increased in EI seedlings relative to EF seedlings under Cd stress, while malondialdehyde (MDA) and H2O2 content decreased significantly. Inoculation of endophytic fungus JP4 in roots promoted rice seedling growth and ameliorated the negative effects of Cd stress on the growth of rice seedlings by triggering antioxidant systems and non-enzymatic systems, regulating photosynthetic activities and modifying the Cd distribution.

中文翻译:

内生感染可调节ROS清除系统并改变镉胁迫下水稻幼苗中镉的分布

在本研究中检查了内生菌感染与镉胁迫响应成分之间的关​​系。在带有和不带有内生真菌JP4的感染下,在不同的镉(Cd)胁迫条件下(0、50、100和150μM),将Oryza sativa L.植物在Hoagland的营养液中生长2周。与未感染的处理相比,根部的内生感染促进了水稻幼苗的生长并降低了芽中镉的含量。此外,吸附的镉仍留在根中,而镉从根向芽的迁移量要少得多。与未感染的水稻幼苗相比,除F以外,所有处理中内生感染均显着增加了色素含量,净光合速率(P n)和叶绿素荧光。100μMCd处理中的v / F 0值和叶绿素b含量。镉胁迫下,EI苗相对于EF苗,超氧化物歧化酶(SOD),过氧化氢酶(CAT),过氧化物酶(POD)和谷胱甘肽还原酶(GR)活性以及抗坏血酸(AsA)和谷胱甘肽(GSH)含量增加。 ,而丙二醛(MDA)和H 2 O 2含量显着下降。根部接种内生真菌JP4可促进水稻幼苗的生长,并通过触发抗氧化剂系统和非酶系统,调节光合活性和改变Cd的分布,减轻Cd胁迫对水稻幼苗生长的负面影响。
更新日期:2019-11-18
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