Scientia Agricultura Sinica ›› 2017, Vol. 50 ›› Issue (10): 1922-1929.doi: 10.3864/j.issn.0578-1752.2017.10.017

• RESEARCH NOTES • Previous Articles     Next Articles

Effect of Hyperosmotic Stress on Growth and Development of Setosphaeria turcica and Determination of Osmolytes in the Mycelium Cells of the Pathogen

GONG XiaoDong1, LIU XingChen1, ZHAO LiQing1, ZHENG YaNan1, FAN YongShan2, HAN JianMin1GU ShouQin1, DONG JinGao1   

  1. 1Mycotoxin and Molecular Plant Pathology Laboratory, Agricultural University of Hebei, Baoding 071001, Hebei; 2Department of Life Sciences, Tangshan Normal College, Tangshan 063000, Hebei
  • Received:2016-11-26 Online:2017-05-16 Published:2017-05-16

Abstract: 【Objective】The objective of this study is to understand the effect of hyperosmotic stress on the growth and development, melanin content in mycelium cells, determine the probable osmolytes in the mycelium cells and to clarify the variation rule of these substances under different hyperosmotic stress conditions in Setosphaeria turcica. 【Method】The effects of hyperosmotic stress on colony growth rate, mycelium morphological characteristics and melanin content in S. turcica mycelium cell were analyzed under different hyperosmotic stress media, in which 0.4, 0.8, and 1.2 mol·L-1 NaCl were added in PDA medium. High performance liquid chromatography (HPLC) technology was employed to detect the content of polyhydroxy-alcohol including glycerol, erythrol, glucose, mannitol, trehalose and analyzed the change profiles of these substances as time increased. 【Result】Compared to the strain cultured on PDA medium, the strain cultured under hyperosmotic stress treatments appeared with decreased in colony growth rate, shortened septum and swollen cells. Melanin content in mycelium cells cultured under hyperosmotic stress treatments in all time points showed a significant difference compared to the control group, in which melanin content in the samples treated before 12 h were lower than that in control, but there were no obvious differences between the samples treated. Moreover, there were different effects under different times (24, 48 h) and different concentration treatments. Compared to the control group, melanin content in the samples treated with 1.2 mol·L-1 NaCl was significantly increased, melanin content treated with 0.8 mol·L-1 NaCl was significantly decreased, melanin content in samples treated with 0.4 mol·L-1 NaCl was significantly decreased in 24 h, but the content in the samples after 48 h treatment was almost the same with the control. Mannitol contents in mycelium cell under different hyperosmotic stress treatments were increased with the increase in time, especially the mannitol content significantly increased after 36 h treatment. There was a similar change tendency in glycerol and mannitol contents in mycelium cells under different treatments. Glycerol content increased most obviously compared with the control group and the content was significantly increased after 24 h treatment. Trehalose content in mycelium cells showed an increasing tendency as time increased, and the tendency increased with the increase of stress intensity, however, trehalose content after 36 h treatment was significantly lower than that in control group, while no significant difference was found in the changes of erythrol and glucose contents. No mannitol, trehalose and glycerol were detected in culture filtrate, while glucose content had no significant change no matter the fact that the mycelium was cultured in PDA medium or under hyperosmotic stress treatments.【Conclusion】 The colony growth rate was inhibited, mycelium cell was swollen, and septum was shortened under hyperosmotic stress. There was a significant inhibition on mannitol content before 12 h treatment. Mannitol and glycerol were main osmolytes in mycelium cells. Trehalose was also involved in hyperosmotic stress reaction in S. turcica

Key words: Setosphaeria turcica;hyperosmotic stress, growth and development, osmolyte

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