Comparison on stress memory of two Hypnaceae moss species to haze

Author:

Liu Binyang12,Zhang Xinru1,Jiang Gaoming2

Affiliation:

1. College of Life Sciences, Hebei Normal University , Shijiazhuang 050024 , China

2. State Key Laboratory of Vegetation and Environment Change, Institute of Botany, Chinese Academy of Sciences , Beijing 100093 , China

Abstract

Abstract Industrialization and the rapid growth of economies have caused severe environmental pollution, which might impact the survival of sensitive species. In this study, we investigated the defense responses of two common mosses with varying anti-haze capacities, Hypnum callichroum and Homomallium incurvatum, in response to simulated haze pollution. Photoprotection and antioxidant mechanisms of both mosses were measured immediately after the first exposure to the haze treatment, followed by the initial recovery stage and again after exposure to secondary stress and secondary recovery. Haze exposure caused severe oxidative stress and photodamage in both H. callichroum and H. incurvatum. Metabolic processes such as photorespiration, the ascorbate–glutathione cycle and secondary metabolism—which play roles in defense responses—were significantly activated in both moss species after haze treatment. During the recovery following haze stress, H. callichroum exhibited a significant stress memory response, as evidenced by the greater accumulation of several memory substances, including xanthophylls and phenolic acids. However, H. incurvatum did not exhibit a strong stress memory response, which might explain its relatively inferior anti-haze capacity in the natural environment.

Funder

National Science for Youth Foundation

China Postdoctoral Science Foundation

Science and Technology Project of Hebei Education Department

Publisher

Oxford University Press (OUP)

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