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Mean (+/− 1 S.E.) root colonization by dark septate endophytes (DSE) (A), and Shannon diversity index of the DSE communities (B) found in the roots of pinyon pine trees grown under ambient (control), warming (+4.8°C compared to ambient), drought (−50% of precipitation) and combined heat and drought treatments for 6 years. Different letters above the bars denote differences among groups at p < 0.05.
