Modelling temporal variation of parameters used in two photosynthesis models: influence of fruit load and girdling on leaf photosynthesis in fruit-bearing branches of apple

Poirier-Pocovi, Magalie; Lothier, Jérémy; Buck-Sorlin, Gerhard

doi:10.1093/aob/mcx139

Cited by 26 publications

(21 citation statements)

References 49 publications

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“…Many studies have found that phloem girdling reduces the net photosynthetic rate (Pn) of plant leaves 23 . Sala et al 24 showed that phloem girdling influenced the rate of photosynthetic assimilation, and Poirier-Pocovi et al 25 showed that phloem girdling reduced the photosynthesis rate of leaves. Similar findings were also shown in this study.…”

Section: Discussionmentioning

confidence: 99%

“…At this time, the plant might avoid absorbing too much light by reducing the content of photosynthetic pigments. This reaction is the feedback regulation according to the source-sink relation 25 . The application of modifiers improved the photosynthesis of leaves because the chlorophyll content was significantly increased, and the effect of the application of organic polymer compound modifier after stem girdling was more obvious.…”

Section: Discussionmentioning

confidence: 99%

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Study on the effects of polymer modifiers and phloem girdling on cotton in cadmium-contaminated soil in Xinjiang Province, China

Wei

Wang

et al. 2020

Sci Rep

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The effects of two liquid modifiers (polyacrylate compound modifier and organic polymer compound modifier) and phloem girdling (stem girdling and branch girdling) on cadmium (Cd) content, Cd transport, and photosynthetic parameters of cotton (Xinluzao 60) in Cd-contaminated soil (40 mg kg −1) were studied through barrel experiment. The results showed that the distribution ratios of Cd in stem, leaves, and bolls, leaf net photosynthetic rate (Pn), leaf stomatal conductance (Gs), leaf transpiration rate (Tr), and chlorophyll content were decreased after girdling; and the application of modifiers reduced the Cd content and the Cd transported to the shoot, while alleviating photosynthetic damage caused by girdling. In general, our results indicated that the inhibition of carbohydrate supply caused by girdling reduced the photosynthetic capacity of cotton, while the applications of the two liquid modifiers decrease the influence to cotton photosynthesis. Moreover, Cd and modifiers may be transported to the shoot through both phloem and xylem. Cadmium (Cd) is a toxic heavy metal commonly found in agricultural soils 1. It is not necessary for plants, but it is easily absorbed by plant root and enriched in different tissues and organs 2. Therefore, many scholars have studied the accumulation of Cd in crops and tried to reduce the uptake of Cd by crops. For example, Sebastian et al. 3 found that the application of organic acids reduced the accumulation of Cd in plant leaves, while the application of malic acid reduced the accumulation of Cd in plant roots. Shi et al. 4 found that super absorbent polymer (SAP) immobilized heavy metals in soil, which had a positive effect on maize photosynthesis and growth. Moreover, to reduce the accumulation of Cd, it is necessary to understand the mechanism of Cd transport in plants 5,6. Mori et al. 7 indicated that the xylem unloading limited the transport of Cd from root to shoots of wild eggplant. Qin et al. 8 found that phloem played a leading role in the transport of Cd from root to leaves. However, there is no conclusive study on the transport of Cd in cotton at present. Photosynthesis is a biological process in which plants convert light energy into chemical energy that can be used in life processes and synthesize organic matter. It is the physiological basis of plant survival and one of the most basic physiological processes in plant production 9. However, Cd may inhibit photosynthesis of plants 10. Moradi and Ehsanzadeh 11 reported that Cd inhibited chlorophyll synthesis, resulting in a decrease in the amount of light-harvesting chlorophyll a/b-binding protein. Paunov et al. 12 reported that Cd interfered with the photosynthetic electron-transfer process and decreased the efficiency of energy conversion in photosystem II. Therefore, the remediation of Cd pollution has been studied through plant photosynthesis regulation. For example, Liu et al. 13 found that the application of salicylic acid significantly reduced Cd absorption in most Cd-stressed plants and restored photosynthet...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Study on the effects of polymer modifiers and phloem girdling on cotton in cadmium-contaminated soil in Xinjiang Province, China

Wei

Wang

et al. 2020

Sci Rep

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“…Remobilization and storage of nonstructural carbon after phloem transport manipulation in trees also partially drive alterations in respiratory rates (Figure 3, interactions C & F), which are consistently higher upstream and lower downstream in girdled (Domec and Pruyn, 2008;Maier et al, 2010;Maunoury-Danger et al, 2010), compressed (Henriksson et al, 2015), and chilled stems . Leaf respiration has also been shown to increase after girdling (Maunoury-Danger et al, 2010;Poirier-Pocovi et al, 2018) and phloem chilling . These changes in respiration rates result from a combination of changes in metabolic demand to fuel starch biosynthesis or hydrolysis (Figure 3, interaction F), and changes in growth respiration (Figure 3, interaction 6).…”

Section: Impacts Of Phloem Transport Manipulations On Carbon Dynamicsmentioning

confidence: 99%

“…Thus, caution must be exercised when extrapolating from studies of herbaceous plants to infer carbon dynamics and use in trees. Indeed, evidence from past phloem transport manipulations suggests that, like herbaceous plants, trees actively manage source and sink tissues (i.e., Poirier-Pocovi et al, 2018), thus they are not adequately represented by the prevailing modeling paradigm, that models sink activity as a proportion of source activity (Friend et al, 1997;Cramer et al, 2001;Smith et al, 2001;Ito and Oikawa, 2002;Sitch et al, 2003;Krinner et al, 2005;Inatomi et al, 2010;Tian et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Using Direct Phloem Transport Manipulation to Advance Understanding of Carbon Dynamics in Forest Trees

Rademacher

Basler

Eckes-Shephard

et al. 2019

Front. For. Glob. Change

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Carbon dynamics within trees are intrinsically important for physiological functioning, in particular growth and survival, as well as ecological interactions on multiple timescales. Thus, these internal dynamics play a key role in the global carbon cycle by determining the residence time of carbon in forests via allocation to different tissues and pools, such as leaves, wood, storage, and exudates. Despite the importance of tree internal carbon dynamics, our understanding of how carbon is used in trees, once assimilated, has major gaps. The primary tissue that transports carbon from sources to sinks within a tree is the phloem. Therefore, direct phloem transport manipulation techniques have the potential to improve understanding of numerous aspects of internal carbon dynamics. These include relationships between carbon assimilation, nonstructural carbon availability, respiration for growth and tissue maintenance, allocation to, and remobilization from, storage reserves, and long-term sequestration in lignified structural tissues. This review aims to: (1) introduce the topic of direct phloem transport manipulations, (2) describe the three most common methods of direct phloem transport manipulation and review their mechanisms, namely (i) girdling, (ii) compression and (iii) chilling; (3) summarize the known impacts of these manipulations on carbon dynamics and use in forest trees; (4) discuss potential collateral effects and compare the methods; and finally (5) highlight outstanding key questions that relate to tree carbon dynamics and use, and propose ways to address them using direct phloem transport manipulation.

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“…By simulating light-response curves of photosynthesis (A n -I curve), NH model has been widely used to obtain key photosynthetic characteristics (e.g., the maximum net photosynthetic rate, A nmax ; light compensation point when A n = 0, I c ; dark respiration rate, R d ) for various species under different environmental conditions (e.g., Ögren & Evans, 1993;Thornley, 1998;Ye, 2007;Aspinwall et al, 2011;dos Santos et al, 2013;Mayoral et al, 2015;Sun et al, 2015;Park et al, 2016;Quiroz et al, 2017;Yao et al, 2017;Xu et al, 2019;Yang et al, 2020;Ye et al, 2020). Significant difference between observed A nmax values and that estimated by NH model for various species has been widely reported (e.g., Chen et al, 2011;dos Santos et al, 2013;Lobo et al, 2014;Ogawa, 2015;Sun et al, 2015;Quiroz et al, 2017;Poirier-Pocovi et al, 2018;Ye et al, 2020). This long-standing challenge has been resolved by an A n -I model, which adopts a nonasymptotic function and can accurately reproduce A n -I curve over light-limited, lightsaturated and photoinhibitory I levels (Ye et al, 2013) (hereafter, Ye model).…”

Section: Introductionmentioning

confidence: 99%

Modeling Light Response of Electron Transport Rate and Its Allocation for Ribulose Biphosphate Carboxylation and Oxygenation

Kang

et al. 2020

Front. Plant Sci.

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Modelling temporal variation of parameters used in two photosynthesis models: influence of fruit load and girdling on leaf photosynthesis in fruit-bearing branches of apple

Abstract: The present study proposed a way to model the photosynthesis rate by temporal and environmental variables only. A proper validation of this model will be necessary to extend its utilization and appreciate its predictive capacity fully.

Cited by 26 publications

References 49 publications

Study on the effects of polymer modifiers and phloem girdling on cotton in cadmium-contaminated soil in Xinjiang Province, China

Study on the effects of polymer modifiers and phloem girdling on cotton in cadmium-contaminated soil in Xinjiang Province, China

Using Direct Phloem Transport Manipulation to Advance Understanding of Carbon Dynamics in Forest Trees

Modeling Light Response of Electron Transport Rate and Its Allocation for Ribulose Biphosphate Carboxylation and Oxygenation

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