Seasonal Dynamics of Photochemical Performance of PS II of Terrestrial Mosses from Different Elevations
Mosses are critical components of tropical forest ecosystems and have multiple essential ecological functions. The drying and rehydrating and often hot environments in tropical regions present some of the greatest challenges for their photosynthetic activities. There is limited knowledge available o...
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MDPI AG
2021-11-01
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| Series: | Plants |
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| Online Access: | https://www.mdpi.com/2223-7747/10/12/2613 |
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| author | Jiewei Hao Xueyan Xu Lina Zhang |
| author_facet | Jiewei Hao Xueyan Xu Lina Zhang |
| author_sort | Jiewei Hao |
| collection | DOAJ |
| description | Mosses are critical components of tropical forest ecosystems and have multiple essential ecological functions. The drying and rehydrating and often hot environments in tropical regions present some of the greatest challenges for their photosynthetic activities. There is limited knowledge available on the physiological responses to the changing environments such as temperature and water pattern changes for terrestrial mosses. We examined the seasonal dynamics of photochemical performance of PS II through the measuring of chlorophyll fluorescence of 12 terrestrial mosses in situ from five different elevations by Photosynthesis Yield Analyzer MINI-PAM-II, along with the seasonal changes of climatic factors (air temperature, dew point, relative humidity and rainfall), which were collected by local weather stations and self-deployed mini weather stations. The results showed a great seasonality during observing periods, which, mainly the changes of rainfall and relative humidity pattern, presented significant impacts on the photochemical performance of PS II of terrestrial mosses. All these tested moss species developed a suitable regulated and non-regulated strategy to avoid the detrimental effect of abiotic stresses. We found that only <i>Hypnum plumaeforme</i>, <i>Pterobryopsis crassicaulis</i> and <i>Pogonatum inflexum</i> were well adapted to the changes of habitat temperature and water patterns, even though they still experienced a lower CO<sub>2</sub> assimilation efficiency in the drier months. The other nine species were susceptible to seasonality, especially during the months of lower rainfall and relative humidity when moss species were under physiologically reduced PS II efficiency. <i>Anomobryum julaceum</i>, <i>Pogonatum neesii</i>, <i>Sematophyllum subhumile</i>, <i>Pseudotaxiphyllum pohliaecarpum</i> and <i>Leucobryum boninense</i>, and especially <i>Brachythecium buchananii</i>, were sensitive to the changes of water patterns, which enable them as ideal ecological indicators of photosynthetic acclimation to stressed environments as a result of climate change. |
| first_indexed | 2024-03-10T03:17:29Z |
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| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-03-10T03:17:29Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-68c87a9d9f4c445c90d75e006f530c462023-11-23T10:10:42ZengMDPI AGPlants2223-77472021-11-011012261310.3390/plants10122613Seasonal Dynamics of Photochemical Performance of PS II of Terrestrial Mosses from Different ElevationsJiewei Hao0Xueyan Xu1Lina Zhang2School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, ChinaCenter for Eco-Environmental Restoration Engineering of Hainan Province, Hainan University, 58 Renmin Road, Haikou 570228, ChinaCenter for Eco-Environmental Restoration Engineering of Hainan Province, Hainan University, 58 Renmin Road, Haikou 570228, ChinaMosses are critical components of tropical forest ecosystems and have multiple essential ecological functions. The drying and rehydrating and often hot environments in tropical regions present some of the greatest challenges for their photosynthetic activities. There is limited knowledge available on the physiological responses to the changing environments such as temperature and water pattern changes for terrestrial mosses. We examined the seasonal dynamics of photochemical performance of PS II through the measuring of chlorophyll fluorescence of 12 terrestrial mosses in situ from five different elevations by Photosynthesis Yield Analyzer MINI-PAM-II, along with the seasonal changes of climatic factors (air temperature, dew point, relative humidity and rainfall), which were collected by local weather stations and self-deployed mini weather stations. The results showed a great seasonality during observing periods, which, mainly the changes of rainfall and relative humidity pattern, presented significant impacts on the photochemical performance of PS II of terrestrial mosses. All these tested moss species developed a suitable regulated and non-regulated strategy to avoid the detrimental effect of abiotic stresses. We found that only <i>Hypnum plumaeforme</i>, <i>Pterobryopsis crassicaulis</i> and <i>Pogonatum inflexum</i> were well adapted to the changes of habitat temperature and water patterns, even though they still experienced a lower CO<sub>2</sub> assimilation efficiency in the drier months. The other nine species were susceptible to seasonality, especially during the months of lower rainfall and relative humidity when moss species were under physiologically reduced PS II efficiency. <i>Anomobryum julaceum</i>, <i>Pogonatum neesii</i>, <i>Sematophyllum subhumile</i>, <i>Pseudotaxiphyllum pohliaecarpum</i> and <i>Leucobryum boninense</i>, and especially <i>Brachythecium buchananii</i>, were sensitive to the changes of water patterns, which enable them as ideal ecological indicators of photosynthetic acclimation to stressed environments as a result of climate change.https://www.mdpi.com/2223-7747/10/12/2613chlorophyll fluorescenceecophysiologyenvironmental stressphotosystem IIterrestrial mosses |
| spellingShingle | Jiewei Hao Xueyan Xu Lina Zhang Seasonal Dynamics of Photochemical Performance of PS II of Terrestrial Mosses from Different Elevations Plants chlorophyll fluorescence ecophysiology environmental stress photosystem II terrestrial mosses |
| title | Seasonal Dynamics of Photochemical Performance of PS II of Terrestrial Mosses from Different Elevations |
| title_full | Seasonal Dynamics of Photochemical Performance of PS II of Terrestrial Mosses from Different Elevations |
| title_fullStr | Seasonal Dynamics of Photochemical Performance of PS II of Terrestrial Mosses from Different Elevations |
| title_full_unstemmed | Seasonal Dynamics of Photochemical Performance of PS II of Terrestrial Mosses from Different Elevations |
| title_short | Seasonal Dynamics of Photochemical Performance of PS II of Terrestrial Mosses from Different Elevations |
| title_sort | seasonal dynamics of photochemical performance of ps ii of terrestrial mosses from different elevations |
| topic | chlorophyll fluorescence ecophysiology environmental stress photosystem II terrestrial mosses |
| url | https://www.mdpi.com/2223-7747/10/12/2613 |
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