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Bulletin of Botanical Research ›› 2024, Vol. 44 ›› Issue (1): 107-117.doi: 10.7525/j.issn.1673-5102.2024.01.013

• Physiology and Ecology • Previous Articles     Next Articles

Physiological Responses of Three Bryophytes to Simulated Atmospheric Nitrogen Deposition

Boyi SONG1,2,3,4, Mingming WANG1,2,3,4, Weiwei ZHUANG1,2,3,4()   

  1. 1.College of Life Sciences,Xinjiang Normal University,Urumqi 830054
    2.Key Laboratory of Plant Stress Biology in Arid Land,Urumqi 830054
    3.Xinjiang Key Laboratory of Special Species Conservation and Regulatory Biology,Urumqi 830054
    4.International Research Center for the Collaborative Containment of Cross-border Pests in Central Asia,Urumqi 830054
  • Received:2023-06-14 Online:2024-01-20 Published:2023-12-27
  • Contact: Weiwei ZHUANG E-mail:zww8611@sina.com

Abstract:

Bryophyte is an important component of the surface ecosystem. The physiological response of bryophyte(Syntrichia caninervisBryum argenteum and Plagiomnium acutum) to nitrogen deposition could provide insights into how to use bryophyte scientifically and rationally to indicate the atmospheric nitrogen deposition. Three bryophytes in the northwest of China were selected as materials, and four different nitrogen treatment concentrations(0(N0), 2(N2), 4(N4), 6(N6) g·m-2) were set up, the physiological responses of three bryophytes to the above nitrogen concentration gradients were indicated by measuring the contents of chlorophyll, osmotic regulators and antioxidant enzyme activities. The results showed that:(1)P. acutum of chlorophyll a and chlorophyll b was promoted by 4 nitrogen treatments, especially by N4 treatment. However, N2 had significant inhibitory effects on chlorophyll a and chlorophyll b of B. argenteum and S. caninervis. (2)Proline(Pro), soluble sugar(SS) and soluble protein(SP) were produced in bryophytes to regulate cell osmotic balance. The contents of Pro, SS and SP in B. argenteum and P. acutum all increased under different nitrogen concentrations, but the contents of Pro, SS and SP in mosses decreased under low nitrogen treatment, indicating S. caninervis were more sensitive to N. (3)under the given nitrogen addition treatment, the antioxidant enzyme activities of three bryophytes were promoted by low concentration of nitrogen, but inhibited by high concentration of nitrogen. (4)SOD and CAT played major role in the regulation of the antioxidant system in S. caninervisB. argenteum and P. acutum, respectively. In conclusion, S. caninervis was the most sensitive to nitrogen increase of the three bryophytes, followed by P. acutum. And B. argenteum, suggesting that S. caninervis could be used as an indicator plant for atmospheric nitrogen deposition.

Key words: N deposition, bryophytes, chlorophyll, osmotic-regulating substances, antioxidant enzymes

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