Determination of photosynthetic parameters Vcmax and Jmax for a C3 plant (spring hulless barley) at two altitudes on the Tibetan Plateau

Fan, Yuzhi; Zhang, Zhiming; Zhang, Xianzhou

doi:10.1016/j.agrformet.2011.06.004

Cited by 37 publications

(32 citation statements)

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“…Carboxylation efficiency and electron transport rate through Photosystem II (i.e., V cmax and J max ), increased with elevation, suggesting that both RuBP carboxylation and regeneration are limited by reduced soil moisture at the lowest site. The increase of g s , A max , V cmax , and J max is generally consistent with previous studies that described photosynthetic variation along elevation gradients (Fan et al 2011;Friend et al 1989) and with variable soil water availability (Wei et al 2008;Xu and Baldocchi 2003). Overall, these results suggest that the limitation of photosynthesis by stomata compared to biochemistry changes somewhat with elevation for A. tridentata ssp.…”

Section: Discussionsupporting

confidence: 80%

“…Maximum photosynthetic rate (A max ) and stomatal conductance (g s ) have been found to increase with elevation (Friend et al 1989), presumably as a result of greater soil water content or less stressful air temperatures. Photosynthetic biochemistry, limited by either carboxylation efficiency (V cmax ) or electron transport rate (J max ) (Long and Bernacchi 2003), has also been shown to vary for species that occur over elevation gradients, with both parameters generally increasing with elevation (Fan et al 2011;Shi et al 2006). However, these results have not been entirely consistent, and studies that describe the relationship between J max and elevation are few, especially during severe drought when changes may be most apparent.…”

Section: Introductionmentioning

confidence: 50%

“…Thus, elevational differences in precipitation, soil moisture, and Ψ stem across the gradient likely drive the carboxylation rate and electron transport limitations that we observed. Elsewhere, photosynthetic biochemistry varies for species that occur over elevation gradients, with both V cmax and J max generally increasing with elevation (Fan et al 2011;Shi et al 2006), including for Quercus douglasii nearby in the western Sierra Nevada (Xu and Baldocchi 2003).…”

Section: Discussionmentioning

confidence: 99%

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Water relations and photosynthesis along an elevation gradient for Artemisia tridentata during an historic drought

Reed

Loik

2016

Oecologia

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shrub species was quite resilient to this 1-in-1200 year drought. However, plant water potential and photosynthesis corresponded to differences in soil moisture across the gradient. Soil re-wetting in early summer increased water potential and photosynthesis at the lowest elevation. Effects on water relations and photosynthesis of this widespread, cold desert shrub species may be disproportionate at lower elevations as drought length increases in a future climate. Keywords Leaf gas exchange · CO 2 assimilation · Photosynthetic limitations · V cmax · J max · Drought stress Abbreviations ARate of photosynthetic CO 2 assimilation (µmolLight-saturated rate of CO 2 assimilation (µmol Abstract Quantifying the variation in plant-water relations and photosynthesis over environmental gradients and during unique events can provide a better understanding of vegetation patterns in a future climate. We evaluated the hypotheses that photosynthesis and plant water potential would correspond to gradients in precipitation and soil moisture during a lengthy drought, and that experimental water additions would increase photosynthesis for the widespread evergreen shrub Artemisia tridentata ssp. vaseyana. We quantified abiotic conditions and physiological characteristics for control and watered plants at 2135, 2315, and 2835 m near Mammoth Lakes, CA, USA, at the ecotone of the Sierra Nevada and Great Basin ecoregions. Snowfall, total precipitation, and soil moisture increased with elevation, but air temperature and soil N content did not. Plant water potential (Ψ), stomatal conductance (g s ), maximum photosynthetic rate (A max ), carboxylation rate (V cmax ), and electron transport rate (J max ) all significantly increased with elevations. Addition of water increased Ψ, g s , J max , and A max only at the lowest elevation; g s contributed about 30 % of the constraints on photosynthesis at the lowest elevation and 23 % at the other two elevations. The physiology of this foundational Communicated by Susanne Schwinning. Electronic supplementary materialThe online version of this article

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 50%

Section: Discussionmentioning

confidence: 99%

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Water relations and photosynthesis along an elevation gradient for Artemisia tridentata during an historic drought

Reed

Loik

2016

Oecologia

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“…Correlation between V cmax and J max at 20–25°C modelled from A/C i curves from Arctic/alpine (blue diamond), warm desert (red square) and temperate (orange triangle) species. Data were compiled from Rogers et al (), Albert et al (), Cai et al (), Fan et al (), Shi et al (), Hamerlynck et al (), Huxman and Smith (), Shi et al (), Utsugi et al (), Hinojo‐Hinojo et al () and Kattge and Knorr (). Only statistically significant linear correlations for each group of species are shown.…”

Section: Photosynthesis In Extreme Environments: Taking Advantage Of mentioning

confidence: 99%

How do vascular plants perform photosynthesis in extreme environments? An integrative ecophysiological and biochemical story

et al. 2020

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Summary In this work, we review the physiological and molecular mechanisms that allow vascular plants to perform photosynthesis in extreme environments, such as deserts, polar and alpine ecosystems. Specifically, we discuss the morpho/anatomical, photochemical and metabolic adaptive processes that enable a positive carbon balance in photosynthetic tissues under extreme temperatures and/or severe water‐limiting conditions in C3 species. Nevertheless, only a few studies have described the in situ functioning of photoprotection in plants from extreme environments, given the intrinsic difficulties of fieldwork in remote places. However, they cover a substantial geographical and functional range, which allowed us to describe some general trends. In general, photoprotection relies on the same mechanisms as those operating in the remaining plant species, ranging from enhanced morphological photoprotection to increased scavenging of oxidative products such as reactive oxygen species. Much less information is available about the main physiological and biochemical drivers of photosynthesis: stomatal conductance (gs), mesophyll conductance (gm) and carbon fixation, mostly driven by RuBisCO carboxylation. Extreme environments shape adaptations in structures, such as cell wall and membrane composition, the concentration and activation state of Calvin–Benson cycle enzymes, and RuBisCO evolution, optimizing kinetic traits to ensure functionality. Altogether, these species display a combination of rearrangements, from the whole‐plant level to the molecular scale, to sustain a positive carbon balance in some of the most hostile environments on Earth.

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“…Because of the high altitude of about 4500 m (Thompson et al, 1997) and the harsh environment (i.e. strong solar radiation, high diurnal and annual temperature variations, low CO 2 partial pressure, strong temporal and spatial precipitation variations and steep slopes) (Ren et al, 1997;Liu-Zeng et al, 2008;Fan et al, 2011;Zhang et al, 2015), K. pygmaea pastures are considered to be very vulnerable ecosystems (Wang et al, 2002;Schleuss et al, 2015). The Kobresia pastures are intensively affected by grassland degradation .…”

Section: Introductionmentioning

confidence: 99%

Carbon and Nitrogen Losses from Soil Depend on Degradation of Tibetan Kobresia Pastures

2016

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Degradation of Kobresia pygmaea pastures has strongly increased on the Tibetan Plateau over the last few decades and contributed to a high loss of soil organic carbon and nutrients. The pathways of carbon (C) and nitrogen (N) losses from degraded K. pygmaea pastures are still unclear, but this is a prerequisite to assess the recovery of Tibetan grasslands. We investigated the response of day-and nighttime CO 2 efflux and leaching of dissolved organic C and N, NH 4 + and NO 3 -from K. pygmaea root mats in three degradation stages: living root mat, dying root mat and dead root mat. Dying root mat had the highest C loss as CO 2 and as leached dissolved organic carbon. This indicates K. pygmaea pastures shift from a C sink to a C source following plant death. In contrast, living root mat had the lowest daytime CO 2 efflux (0·38 ± 0·1 μg C g À1 h À1) because CO 2 was assimilated via photosynthesis. Nighttime CO 2 efflux positively correlated with soil moisture for living and dead root mats. It indicates that increasing precipitation might accelerate C losses due to enhanced soil organic carbon decomposition. Furthermore, dead root mat had the highest average NO 3 À loss (23 ± 2·6 mg N L À1) from leaching compared with other root mats. Consequently, leaching increases the negative impacts of pasture degradation on N availability in these often N limited ecosystems and thus impedes the recovery of K. pastures following degradation.

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Determination of photosynthetic parameters Vcmax and Jmax for a C3 plant (spring hulless barley) at two altitudes on the Tibetan Plateau

Cited by 37 publications

References 35 publications

Water relations and photosynthesis along an elevation gradient for Artemisia tridentata during an historic drought

Water relations and photosynthesis along an elevation gradient for Artemisia tridentata during an historic drought

How do vascular plants perform photosynthesis in extreme environments? An integrative ecophysiological and biochemical story

Carbon and Nitrogen Losses from Soil Depend on Degradation of Tibetan Kobresia Pastures

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