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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 plant growth parameters.RGR (relative growth rate, A), NAR (net assimilation rate, B), and LAR (leaf area ratio, C) were analyzed in plants sampled at 0, 28 and 56 d after transplanting. Values are means±SE (n = 20). Significant difference between humidification and control were examined using Tukey’s test. * Significant at P<0.05, ** Significant at P<0.01, *** Significant at P<0.001. NS: non-significant difference.
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pone.0133919.g004: Effect of the micro-fog system on plant growth parameters.RGR (relative growth rate, A), NAR (net assimilation rate, B), and LAR (leaf area ratio, C) were analyzed in plants sampled at 0, 28 and 56 d after transplanting. Values are means±SE (n = 20). Significant difference between humidification and control were examined using Tukey’s test. * Significant at P<0.05, ** Significant at P<0.01, *** Significant at P<0.001. NS: non-significant difference.

Mentions: Plants of micro-fog application and controlled compartment followed similar growth curves in total leaf area and shoot biomass (Fig 3). Plants were homogenous for leaf area and shoot biomass before initiation and expansion of a new cohort of leaves. Growth rates were at maximum on initial stage for both of micro-fog application and control plants (Fig 3). Shoot biomass and leaf area of micro-fog application were significantly higher than control plants around 27 days after micro-fog treatment, indicating that micro-fog effectively promoted leaf expansion and biomass accumulation. The corresponding growth parameters were analyzed and shown in Fig 4. Relative growth rate (RGR) and the net assimilation rate (NAR) of micro-fog treatment plants were significantly higher than the controlled plants, whereas a minor variation in leaf area ratio (LAR) was maintained over the long term acclimation.


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 plant growth parameters.RGR (relative growth rate, A), NAR (net assimilation rate, B), and LAR (leaf area ratio, C) were analyzed in plants sampled at 0, 28 and 56 d after transplanting. Values are means±SE (n = 20). Significant difference between humidification and control were examined using Tukey’s test. * Significant at P<0.05, ** Significant at P<0.01, *** Significant at P<0.001. NS: non-significant difference.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0133919.g004: Effect of the micro-fog system on plant growth parameters.RGR (relative growth rate, A), NAR (net assimilation rate, B), and LAR (leaf area ratio, C) were analyzed in plants sampled at 0, 28 and 56 d after transplanting. Values are means±SE (n = 20). Significant difference between humidification and control were examined using Tukey’s test. * Significant at P<0.05, ** Significant at P<0.01, *** Significant at P<0.001. NS: non-significant difference.
Mentions: Plants of micro-fog application and controlled compartment followed similar growth curves in total leaf area and shoot biomass (Fig 3). Plants were homogenous for leaf area and shoot biomass before initiation and expansion of a new cohort of leaves. Growth rates were at maximum on initial stage for both of micro-fog application and control plants (Fig 3). Shoot biomass and leaf area of micro-fog application were significantly higher than control plants around 27 days after micro-fog treatment, indicating that micro-fog effectively promoted leaf expansion and biomass accumulation. The corresponding growth parameters were analyzed and shown in Fig 4. Relative growth rate (RGR) and the net assimilation rate (NAR) of micro-fog treatment plants were significantly higher than the controlled plants, whereas a minor variation in leaf area ratio (LAR) was maintained over the long term acclimation.

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