Seasonal variations in leaf-level photosynthesis and water use efficiency of three isohydric to anisohydric conifers on the Tibetan Plateau

Fang, Wang; Zhang, Fen; Gou, Xiaohua; Fonti, Patrick; Xia, Junfang; Cao, Zongying; Liu, Jianguo; Wang, Yanfang; Zhang, Junzhou

doi:10.1016/j.agrformet.2021.108581

Cited by 22 publications

(16 citation statements)

References 85 publications

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“…In this study, among the three species, M . malabathricum seems to be an isohydric plant [ 11 , 46 , 47 ] with tight stomata regulation, which closes its stomata early under drought conditions to prevent water losses ( Fig 6B ) with a slight decrease in the ψ shoot ( Fig 8F ). For M .…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic gas exchange, plant water relations and osmotic adjustment of three tropical perennials during drought stress and re-watering

He,

Ng,

Qin

et al. 2024

PLoS ONE

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Planting vegetation on slopes is an effective way of improving slope stability while enhancing the aesthetic appearance of the landscape. However, plants growing on slopes are susceptible to natural drought stress (DS) conditions which commonly lead to water deficit in plant tissues that affect plant health and growth. This study investigated the photosynthetic gas exchange, plant water status and proline accumulation of three tropical perennials namely Clerodendrum paniculatum, Ipomoea pes-caprae and Melastoma malabathricum after being subjected to DS and re-watering (RW). During DS, there was a significant decrease in light-saturated photosynthetic CO2 assimilation rate (Asat), stomatal conductance (gs sat), and transpiration rate (Tr) for all three plant species. Leaf relative water content, shoot water potential, and leaf, stem and root water content also declined during DS. Proline concentration increased for all three species during DS, reaching especially high levels for C. paniculatum, suggesting that it heavily relies on the accumulation of proline to cope with DS. Most of the parameters recovered almost completely to levels similar to well-watered plants after RW, apart from M. malabathricum. Strong linear correlations were found between Asat and gs sat and between gs sat and Tr. Ultimately, C. paniculatum and I. pes-caprae had better drought tolerance than M. malabathricum.

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Section: Discussionmentioning

confidence: 99%

Photosynthetic gas exchange, plant water relations and osmotic adjustment of three tropical perennials during drought stress and re-watering

He,

Ng,

Qin

et al. 2024

PLoS ONE

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“…Leaves play a crucial role in the exchange of carbon, water, and energy between the atmosphere and land [6]. To adjust to different habitats, plants show different anatomical traits, leaf photosynthetic characteristics, and morphological traits [7,8]; leaf functional traits (such as SL, SD, and SLA) are adaptive traits in tree species and characterize the population/species drought resistance and/or water retention ability [9]. It is widely known that leaf traits are capable of characterizing plant function, and therefore are widely used to evaluate a plant's response to differing environmental conditions, such as drought, shade, and nutrient deficiency.…”

Section: Introductionmentioning

confidence: 99%

“…In response to seasonal changes or stress, photosynthetic physiological factors such as leaf water potential, transpiration rate, and water use efficiency were regulated, as well as structural traits (e.g., anatomical structure) and morphological traits (e.g., surface area). In previous studies, leaf traits varying between seasons was widely measured in multiple species and various forests across a variety of regions [6,8,[10][11][12][13]. These seasonal variations are commonly attributed to changes in the environment conditions, and each functional trait responds to the changing conditions differently.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Patterns and Species Variability in the Leaf Traits of Dominant Plants in the Tropical Rainforests of Hainan Island, China

Qiu

Nong

et al. 2023

Forests

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The leaf traits measured in multiple species are known to vary between seasons, but there is a knowledge gap relating to the seasonal variability and environmental adaptation of plants in tropical rainforests. To investigate the dynamics of the functional traits of dominant species in tropical rainforests and the differences in their adaptation strategies to seasonal drought, the results of this study can provide a scientific basis for tropical rainforest conservation resource protection. Six dominant species, including three trees (Hopea reticulata, Vatica mangachapoi, and Diospyros chunii) and three vine plants (Ancistrocladus tectorius, Phanera khasiana, and Uvaria sanyaensis), in tropical lowland rainforest in the Ganzaling Nature Reserve of Hainan province were selected as study objectives. The key leaf traits were studied using the paraffin section method, leaf epidermis segregation method, and Li-6400 portable photosynthesis system in June, September, December, 2019, and March, 2020. Results showed that significant differences in photosynthetic physiology and morphological and structural parameters among species, as well as seasonal variability, were observed in leaf photosynthetic physiology, but not in leaf morphological or structural parameters. A phenotypic plasticity index (PPI) analysis revealed more variability in leaf photosynthetic physiology (Average PPI = 0.37) than in leaf anatomical structure and morphology (Average PPI = 0.26), suggesting that they adapt to seasonal changes primarily by regulating photosynthetic physiological parameters rather than leaf morphology or anatomical structure. The dominant trees were found to have higher water use efficiency, leaf dry-matter content, and smaller leaf areas compared to vine plants. This indicates that the dominant tree species depend on high water use efficiency and leaf morphological characteristics to adapt to seasonal changes. The majority of leaf anatomical structure parameters associated with drought tolerance were higher in the three dominant vine species, indicating that the dominant vine species adapted to drought stress primarily by altering the leaf anatomical structure This study provides information on how tropical rainforest plants adapt to seasonal drought as well as supporting the protection of tropical rainforest ecosystems.

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“…Relative water content (RWC) is generally influenced by stress and it is a better indicator of water stress for conifers [25]. Furthermore, Juniperus przewalskii has a different pattern of transpiration due to seasons and vapor pressure [26]. Moreover, the study of Picea abies validated that drought stress causes conifer xylem pressure loss [27].…”

Section: Introductionmentioning

confidence: 99%

Distribution and Physiology of Juniperus seravschanica Trees in the Genow—The Southernmost and Arid Habitat of Iran

Boogar

Sher

Seyedabadi

2022

Water

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Juniperus seravschanica is the southernmost population of Juniperus that has a limited habitat in the world near the equator. In Iran, the lone habitat of this species in the Genow mountains has been endangered with thin foliage, abscissing needles, and dried shoots. The current study investigated the effects of climatic, genetic factors, and physiologic indices on the distribution of J. seravschanica. Distribution was evaluated for 450 ha and physiological indices were evaluated for two groups: (A) trees with dried branches and (B) trees without dried branches. Results showed that the distribution of J. seravschanica in the Genow habitat was influenced by elevation, slope degree, aspect, and distance to stream. Results also indicated that max temperature and precipitation are two effective factors that have the highest effects on falling needles and drying branches of J. seravschanica. Chlorophyll, relative water content (RWC), and relative turgidity (RT) are significantly influenced by max temperature. Endangered trees with dried branches had a lower chlorophyll content, RWC, and RT than trees without dried branches. Vulnerability of J. seravschanica was significantly influenced by its genetic structure. Results of AMOVA showed 83% genetic variability between two groups of J. seravschanica trees.

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Seasonal variations in leaf-level photosynthesis and water use efficiency of three isohydric to anisohydric conifers on the Tibetan Plateau

Cited by 22 publications

References 85 publications

Photosynthetic gas exchange, plant water relations and osmotic adjustment of three tropical perennials during drought stress and re-watering

Photosynthetic gas exchange, plant water relations and osmotic adjustment of three tropical perennials during drought stress and re-watering

Seasonal Patterns and Species Variability in the Leaf Traits of Dominant Plants in the Tropical Rainforests of Hainan Island, China

Distribution and Physiology of Juniperus seravschanica Trees in the Genow—The Southernmost and Arid Habitat of Iran

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