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Regulation of Vapor Pressure Deficit by Greenhouse Micro-Fog Systems Improved Growth and Productivity of Tomato via Enhancing Photosynthesis during Summer Season.

Zhang D, Zhang Z, Li J, Chang Y, Du Q, Pan T - PLoS ONE (2015)

Bottom Line: These improvements in physiological and morphological traits resulted in around 12.3% increase of marketable tomato yield per plant.Measurement of leaf gas exchange parameters also demonstrated that micro-fog treatment significantly enhanced leaf photosynthesis capacity.Taken together, manipulation of VPD in greenhouses by micro-fog systems effectively enhanced tomato growth and productivity via improving photosynthesis during summer season.

View Article: PubMed Central - PubMed

Affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi, China.

ABSTRACT
The role of a proposed micro-fog system in regulating greenhouse environments and enhancing tomato (Solanum lycopersicum L.) productivity during summer season was studied. Experiments were carried out in a multi-span glass greenhouse, which was divided into two identical compartments involving different environments: (1) without environment control and (2) with a micro-fog system operating when the air vapor pressure deficit (VPD) of greenhouse was higher than 0.5 KPa. The micro-fog system effectively alleviated heat stress and evaporative demand in the greenhouse during summer season. The physiologically favourable environment maintained by micro-fog treatment significantly enhanced elongation of leaf and stem, which contributed to a substantial elevation of final leaf area and shoot biomass. These improvements in physiological and morphological traits resulted in around 12.3% increase of marketable tomato yield per plant. Relative growth rate (RGR) of micro-fog treatment was also significantly higher than control plants, which was mainly determined by the substantial elevation in net assimilation rate (NAR), and to a lesser extent caused by leaf area ratio (LAR). Measurement of leaf gas exchange parameters also demonstrated that micro-fog treatment significantly enhanced leaf photosynthesis capacity. Taken together, manipulation of VPD in greenhouses by micro-fog systems effectively enhanced tomato growth and productivity via improving photosynthesis during summer season.

No MeSH data available.


Related in: MedlinePlus

Effect of the micro-fog system on leaf gas exchange parameters.Parameters were determined 40 days after transplanting. Values are means±SE (n = 10), significant difference between humidification treatment and control were compared using Tukey’s test. * Significant at P<0.05, ** Significant at P<0.01, *** Significant at P<0.001.
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pone.0133919.g005: Effect of the micro-fog system on leaf gas exchange parameters.Parameters were determined 40 days after transplanting. Values are means±SE (n = 10), significant difference between humidification treatment and control were compared using Tukey’s test. * Significant at P<0.05, ** Significant at P<0.01, *** Significant at P<0.001.

Mentions: Regulation of VPD and manipulation of stomatal characteristics had important physiological implication for leaf gas exchange. Micro-fog application significantly enhanced stomatal conductance and photosynthesis rate, whereas, decreased transpiration rate (Fig 5). As a result, micro-fog application significantly elevated the instantaneous water use efficiency (Inst WUE) on leaf scale, without substantial cost to photosynthetic carbon fixation.


Regulation of Vapor Pressure Deficit by Greenhouse Micro-Fog Systems Improved Growth and Productivity of Tomato via Enhancing Photosynthesis during Summer Season.

Zhang D, Zhang Z, Li J, Chang Y, Du Q, Pan T - PLoS ONE (2015)

Effect of the micro-fog system on leaf gas exchange parameters.Parameters were determined 40 days after transplanting. Values are means±SE (n = 10), significant difference between humidification treatment and control were compared using Tukey’s test. * Significant at P<0.05, ** Significant at P<0.01, *** Significant at P<0.001.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4519188&req=5

pone.0133919.g005: Effect of the micro-fog system on leaf gas exchange parameters.Parameters were determined 40 days after transplanting. Values are means±SE (n = 10), significant difference between humidification treatment and control were compared using Tukey’s test. * Significant at P<0.05, ** Significant at P<0.01, *** Significant at P<0.001.
Mentions: Regulation of VPD and manipulation of stomatal characteristics had important physiological implication for leaf gas exchange. Micro-fog application significantly enhanced stomatal conductance and photosynthesis rate, whereas, decreased transpiration rate (Fig 5). As a result, micro-fog application significantly elevated the instantaneous water use efficiency (Inst WUE) on leaf scale, without substantial cost to photosynthetic carbon fixation.

Bottom Line: These improvements in physiological and morphological traits resulted in around 12.3% increase of marketable tomato yield per plant.Measurement of leaf gas exchange parameters also demonstrated that micro-fog treatment significantly enhanced leaf photosynthesis capacity.Taken together, manipulation of VPD in greenhouses by micro-fog systems effectively enhanced tomato growth and productivity via improving photosynthesis during summer season.

View Article: PubMed Central - PubMed

Affiliation: College of Horticulture, Northwest A&F University, Yangling, Shaanxi, China.

ABSTRACT
The role of a proposed micro-fog system in regulating greenhouse environments and enhancing tomato (Solanum lycopersicum L.) productivity during summer season was studied. Experiments were carried out in a multi-span glass greenhouse, which was divided into two identical compartments involving different environments: (1) without environment control and (2) with a micro-fog system operating when the air vapor pressure deficit (VPD) of greenhouse was higher than 0.5 KPa. The micro-fog system effectively alleviated heat stress and evaporative demand in the greenhouse during summer season. The physiologically favourable environment maintained by micro-fog treatment significantly enhanced elongation of leaf and stem, which contributed to a substantial elevation of final leaf area and shoot biomass. These improvements in physiological and morphological traits resulted in around 12.3% increase of marketable tomato yield per plant. Relative growth rate (RGR) of micro-fog treatment was also significantly higher than control plants, which was mainly determined by the substantial elevation in net assimilation rate (NAR), and to a lesser extent caused by leaf area ratio (LAR). Measurement of leaf gas exchange parameters also demonstrated that micro-fog treatment significantly enhanced leaf photosynthesis capacity. Taken together, manipulation of VPD in greenhouses by micro-fog systems effectively enhanced tomato growth and productivity via improving photosynthesis during summer season.

No MeSH data available.


Related in: MedlinePlus