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Effects of endogenous hormones and climate factors on ergot alkaloids accumulation of Epichloë endophyte-drunken horse grass symbiont
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  • Jing Liu,
  • jiang Chen,
  • Taixiang Chen,
  • Qian Shi,
  • Yuan Jin,
  • zhang Li,
  • xiao Lang,
  • Chunjie Li
Jing Liu
Lanzhou University

Corresponding Author:[email protected]

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jiang Chen
Lanzhou University
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Taixiang Chen
Lanzhou University
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Qian Shi
Lanzhou University
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Yuan Jin
Lanzhou University
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zhang Li
Qinghai University
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xiao Lang
Lanzhou University
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Chunjie Li
Lanzhou University
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Abstract

Epichloë endophyte can protect drunken horse grass (Achnatherum inebrians)s from pest and livestock by producing alkaloids, which are attributed to very high level ergonovine and ergine. In this and other plants, biotic and abiotic stresses can trigger alkaloid production but the relationship between the concentration of ergot alkaloids and endogenous hormones and how do climate factors affect ergot alkaloid content were not studied. Here, we analyzed the relationship between alkaloid production, endogenous hormones and climate factors by Pearson’s method and best Structural Equation Modeling (SEM) model. We observed that ergot alkaloids (ergonovine, ergine and total alkaloid) contents of A. inebrians from twenty sites were positively correlated with jasmonic acid (JA) and ethylene (ET) (P < 0.01), negatively correlated with salicylic acid (SA) (P < 0.05). The ergot alkaloids contents were not significantly affected by climate factors (mean annual rainfall, altitude and mean annual temperature) (P > 0.05). The SEM model indicated that climate factors could indirectly affect the concentration of ergot alkaloids by influencing endogenous hormones levels. These results concluded that endogenous hormones had mainly impacts on ergot alkaloids levels of A. inebrians, whereas the effects of climate factors were limited.