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Aims This study revealed whether endophyte or space mutation have effects on the resistance of perennial ryegrass to drought and salt stress and whether space mutation have impacts on endophyte function. Methods Growth performance, phytohormone contents, stoichiometry of C, N and P, and Na+ and K+ ion transport of endophyte-infected (E+) and endophyte-free (E-) plants, including space mutation and wild type plants, were evaluated under four different treatments (control, drought, salt, and drought combined with salt stress).Results The results showed that stress treatments significantly inhibited (P) the growth of perennial ryegrass and significantly changed (P) SA contents, significantly increased (P) ion transport from underground to aboveground and changed stoichiometry of C, N and P. Endophytes only significantly improved (P) host growth in wild type plants, and had different effects on CTK, GA and SA contents. Endophytes had little effects on regulating the rational distribution of ions and stoichiometry of C, N and P in both mutant and wild type plants, and its role was inconsistent. Space mutation significantly improved (P) host growth under some stress, significantly reduced (P) IAA, ABA, GA and SA contents, Na+/ K+ had different effects on stoichiometry of C, N and P which depends on treatments.Conclusions Plants regulate stoichiometry of C, N and P and ion transport in response to environmental changes. Either endophyte and space mutation had beneficial effects on the stress tolerance of plant only under some treatments. Space mutation did not affect endophyte function. |
