Leaf anatomical adaptations have central roles in photosynthetic acclimation to humidity

Du, Qingjie; Liu, Tao; Jiao, Xiaocong; Song, Xiaoming; Zhang, Jiayu; Li, Jianming

doi:10.1093/jxb/erz238

Cited by 53 publications

(29 citation statements)

References 67 publications

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“…For example, Leyva et al [ 39 ] found an increment in antioxidant content in many tomato cultivars grown in the presence of fogging systems. However, cultivation under different RH regimes causes modifications in the organization of crop tissues, cell size, and density [ 40 , 41 ], which may, in turn, affect physiological mechanisms, resource use, and tissue/organ allocation of bioactive compounds.…”

Section: Introductionmentioning

confidence: 99%

Light and Low Relative Humidity Increase Antioxidants Content in Mung Bean (Vigna radiata L.) Sprouts

Amitrano

Arena

Pascale

et al. 2020

Plants

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In the last decades, there has been a growing interest in the production of sprouts, since they are a highly nutritious food, particularly suitable for indoor farming in urban areas. Achieving sprout production in indoor systems requires an understanding of possible alterations induced by the microclimate. The aim of this study was to analyze the combined effect of presence/absence of light and high/low air relative humidity (RH) on mung bean sprouts. Morpho-anatomical development and functional anatomical traits in hypocotyl were quantified. The content of antioxidants, soluble sugars, and starch were measured for nutritional and functional purposes. Different RH regimes mainly induced morpho-anatomical modifications, while the presence/absence of light changed the content of antioxidant compounds. Increments in stele diameter at high RH suggest a higher water uptake and conductivity, compared to the low RH treatment; low RH and light induced anatomical traits improving plant water transport (reduced number of cortical layers) and increased the production of antioxidants. The overall results suggested that RH and light, already at the early stages of development, affect the plant’s nutritional value. Therefore, the combination of light and low RH allows the production of antioxidant-rich mung bean sprouts to be used as a food supplement.

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Section: Introductionmentioning

confidence: 99%

Light and Low Relative Humidity Increase Antioxidants Content in Mung Bean (Vigna radiata L.) Sprouts

Amitrano

Arena

Pascale

et al. 2020

Plants

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“…The changes in carbon investment generally trigger adjustments in anatomical traits involved in plant water dynamics, which occur at multiple places in the plant including stomatal and xylem tissues (Sperry et al, 1998;de Boer et al, 2016;Dewar et al, 2018). Previous studies demonstrates stomatal density decreased to prevent excessive water loss under high VPD in tomato (Lu et al, 2015;Du et al, 2019), rose (Fanourakis et al, 2012), and fava bean (Aliniaeifard et al, 2014). However, few stomata mean a reduction in the maximum potential carbon acquisition.…”

Section: Introductionmentioning

confidence: 99%

“…Tomato (Solanum lycopersicum L.) is one of the most important agricultural plants in the world. High VPD induces contrasting responses in plant water status among tomato cultivars (Zhang et al, 2018;Du et al, 2019). In the present study, two tomato cultivars, Jingpeng and Zhongza, were selected on the basis that they exhibit different responses to altered VPD (Du et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…High VPD induces contrasting responses in plant water status among tomato cultivars (Zhang et al, 2018;Du et al, 2019). In the present study, two tomato cultivars, Jingpeng and Zhongza, were selected on the basis that they exhibit different responses to altered VPD (Du et al, 2019). The responses of water dynamics and anatomical traits were measured on these two cultivars after exposure to long-term high and low VPD.…”

Section: Introductionmentioning

confidence: 99%

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The Response of Water Dynamics to Long-Term High Vapor Pressure Deficit Is Mediated by Anatomical Adaptations in Plants

Jiao

Song

et al. 2020

Front. Plant Sci.

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Vapor pressure deficit (VPD) is the driver of water movement in plants. However, little is known about how anatomical adaptations determine the acclimation of plant water dynamics to elevated VPD, especially at the whole plant level. Here, we examined the responses of transpiration, stomatal conductance (g s), hydraulic partitioning, and anatomical traits in two tomato cultivars (Jinpeng and Zhongza) to long-term high (2.2-2.6 kPa) and low (1.1-1.5 kPa) VPD. Compared to plants growing under low VPD, no variation in g s was found for Jinpeng under high VPD conditions; however, high VPD induced an increase in whole plant hydraulic conductance (K plant), which was responsible for the maintenance of high transpiration. In contrast, transpiration was not influenced by high VPD in Zhongza, which was primarily attributed to a coordinated decline in g s and K plant. The changes in g s were closely related to stomatal density and size. Furthermore, high VPD altered hydraulic partitioning among the leaf, stem, and root for both cultivars via adjustments in anatomy. The increase in lumen area of vessels in veins and large roots in Jinpeng under high VPD conditions improved water transport efficiency in the leaf and root, thus resulting in a high K plant. However, the decreased K plant for Zhongza under high VPD was the result of a decline of water transport efficiency in the leaf that was caused by a reduction in vein density. Overall, we concluded that the tradeoff in anatomical acclimations among plant tissues results in different water relations in plants under high VPD conditions.

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“…A feasible technical explanation to these overestimations is that the empirical model was initially calibrated only for nominal conditions and that a "big leaf" approach is used to calibrate the model equations. A plant, especially when grown in a sub-optimal environment, triggers a cascade of biological processes leading to the development of leaves with different anatomical traits (especially those linked with conductance and hydraulics), thus influencing plant photosynthetic performance and the whole physiological behavior [57][58][59][60]. Therefore, in this specific case, overestimation of stomatal conductance and photosynthesis, while maintaining comparable values of transpiration under off-nominal conditions compared to nominal ones, can be explained by the lack of consideration of structural plasticity (e.g., mesophyll density and vein distribution) which can differentially establish the limits of different physiological processes [5].…”

Section: Discussionmentioning

confidence: 99%

Crop Management in Controlled Environment Agriculture (CEA) Systems Using Predictive Mathematical Models

Amitrano

Chirico

Pascale

et al. 2020

Sensors

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Proximal sensors in controlled environment agriculture (CEA) are used to monitor plant growth, yield, and water consumption with non-destructive technologies. Rapid and continuous monitoring of environmental and crop parameters may be used to develop mathematical models to predict crop response to microclimatic changes. Here, we applied the energy cascade model (MEC) on green- and red-leaf butterhead lettuce (Lactuca sativa L. var. capitata). We tooled up the model to describe the changing leaf functional efficiency during the growing period. We validated the model on an independent dataset with two different vapor pressure deficit (VPD) levels, corresponding to nominal (low VPD) and off-nominal (high VPD) conditions. Under low VPD, the modified model accurately predicted the transpiration rate (RMSE = 0.10 Lm−2), edible biomass (RMSE = 6.87 g m−2), net-photosynthesis (rBIAS = 34%), and stomatal conductance (rBIAS = 39%). Under high VPD, the model overestimated photosynthesis and stomatal conductance (rBIAS = 76–68%). This inconsistency is likely due to the empirical nature of the original model, which was designed for nominal conditions. Here, applications of the modified model are discussed, and possible improvements are suggested based on plant morpho-physiological changes occurring in sub-optimal scenarios.

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Leaf anatomical adaptations have central roles in photosynthetic acclimation to humidity

Abstract: Examination of long-term photosynthetic acclimation of two tomato cultivars (Jinpeng and Zhongza) to leaf-to-air vapour pressure difference reveals that independent changes in epidermal and mesophyll cell size maintain photosynthetic homeostasis in Jinpeng.

Cited by 53 publications

References 67 publications

Light and Low Relative Humidity Increase Antioxidants Content in Mung Bean (Vigna radiata L.) Sprouts

Light and Low Relative Humidity Increase Antioxidants Content in Mung Bean (Vigna radiata L.) Sprouts

The Response of Water Dynamics to Long-Term High Vapor Pressure Deficit Is Mediated by Anatomical Adaptations in Plants

Crop Management in Controlled Environment Agriculture (CEA) Systems Using Predictive Mathematical Models

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