Root Morphology, Plant Growth, Nitrate Accumulation and Nitrogen Metabolism of Temperate Lettuce Grown in the Tropics with Elevated Root-Zone CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; at Different Root-Zone Temperatures

He, Jie; Qin, Lin; Lee, Sing Kong

doi:10.4236/ajps.2016.714169

Cited by 6 publications

(9 citation statements)

References 35 publications

(21 reference statements)

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“…The main root length, number of root tips, and root vigor were all higher than those of the control at six days after treatment. Similar results were found in earlier studies [24]. The plant roots were able to transport CO 2 such as HCO 3…”

Section: Elevated Root-zone Co 2 Affected the Root Growth And Morpholsupporting

confidence: 91%

“…− (dissolved inorganic carbon, DIC) through xylem vessels to the shoot where it could be utilized by photosynthetic tissues for the assimilation of carbon [25]. The elevated root-zone CO 2 concentration increased the light-saturated net photosynthetic rate and photosynthetic products, which alleviated water loss and facilitated a higher turnover of Calvin cycle enzymes in the short term, allowing a greater amount of photoassimilates to be apportioned to the roots for better growth of lettuce [24]. Moreover, root morphology exhibits high plasticity, and the root system could improve the absorption rate of water and nutrients by increasing the number of root tips, or promoting the elongation of the taproot when the external environment changed.…”

Section: Elevated Root-zone Co 2 Affected the Root Growth And Morpholmentioning

confidence: 99%

“…The root concentration of NH 4 + was determined according to the Berthelot reaction [49]. Root total N was determined using the combustion method with a CHN-1000 elemental analyzer (LECO Corporation, St. Joseph, MI, USA) [24]. All measured indicators were recorded using three biological replicates.…”

Section: Determinations Of Nomentioning

confidence: 99%

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Effects of Elevated Root-Zone CO2 on Root Morphology and Nitrogen Metabolism Revealed by Physiological and Transcriptome Analysis in Oriental Melon Seedling Roots

Chen

Yin

et al. 2020

IJMS

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Rhizosphere CO2 is vital for crop growth, development, and productivity. However, the mechanisms of plants’ responses to root-zone CO2 are unclear. Oriental melons are sensitive to root-zone gas, often encountering high root-zone CO2 during cultivation. We investigated root growth and nitrogen metabolism in oriental melons under T1 (0.5%) and T2 (1.0%) root-zone CO2 concentrations using physiology and comparative transcriptome analysis. T1 and T2 increased root vigor and the nitrogen content in the short term. With increased treatment time and CO2 concentration, root inhibition increased, characterized by decreased root absorption, incomplete root cell structure, accelerated starch accumulation and hydrolysis, and cell aging. We identified 1280 and 1042 differentially expressed genes from T1 and T2, respectively, compared with 0.037% CO2-grown plants. Among them, 683 co-expressed genes are involved in stress resistance and nitrogen metabolism (enhanced phenylpropanoid biosynthesis, hormone signal transduction, glutathione metabolism, and starch and sucrose metabolism). Nitrogen metabolism gene expression, enzyme activity, and nitrogen content analyses showed that short-term elevated root-zone CO2 mainly regulated plant nitrogen metabolism post-transcriptionally, and directly inhibited it transcriptionally in the long term. These findings provided a basis for further investigation of nitrogen regulation by candidate genes in oriental melons under elevated root-zone CO2.

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Section: Elevated Root-zone Co 2 Affected the Root Growth And Morpholsupporting

confidence: 91%

Section: Elevated Root-zone Co 2 Affected the Root Growth And Morpholmentioning

confidence: 99%

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Effects of Elevated Root-Zone CO2 on Root Morphology and Nitrogen Metabolism Revealed by Physiological and Transcriptome Analysis in Oriental Melon Seedling Roots

Chen

Yin

et al. 2020

IJMS

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“…Some variations of A sat (Figure 3c) among the different light treatments could be partially responsible for the differences in mizuna shoot FW (Figure 2c). Lettuce is an important temperate high valued leafy green that has been studied extensively in the tropical greenhouse by cooling their RZ [2,11,12] , elevating RZ [CO 2 ] [6][7][8][9][10][11] as well as under different LED light spectral quality in the cool growth room [15] by our team. Controlling growth room temperature and supplemental lighting costs can be high.…”

Section: Productivity and Photosynthesis Of Different Leafy Vegetable...mentioning

confidence: 99%

“…Aeroponic farming systems have been adapted by us for growing high value subtropical and temperate vegetable crops in the tropics through manipulation of root environment such as root-zone temperature (RZT) control in order to save the power energy since 1994 [5] . Aeroponic farming systems have also been used to enrich RZ [CO 2 ] to study its interactive effects with RZT on the productivity and physiological performance of temperate lettuce grown indoors and in the greenhouse [6][7][8][9][10] . Using the aeroponic growing systems, subtropical and temperate can now be grown in Singapore without cooling the whole tropical greenhouse as long as the roots of the plant are cooled [2] .…”

Section: Introductionmentioning

confidence: 99%

Microclimate control to increase productivity and nutritional quality of leafy vegetables in a cost-effective manner

Qin

2022

International Journal of Agricultural and Biological Engineering

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Food security is one of the key global challenges in this century. In Singapore, our research team has been using novel aeroponic technology to produce fresh vegetables since 1997. Aeroponic systems allow for year-round production of not only tropical, but also sub-tropical and temperate fresh vegetables, by simply cooling the roots suspended in aeroponic systems while the aerial parts grow under tropical ambient environments. It has also been used to investigate the impacts of root-zone CO 2 on vegetables by enriching root-zone CO 2 while their aerial portions were subjected to constant atmospheric CO 2 . To compensate for the lack of available land, Singapore also needs to develop a farming system that can increase productivity per unit land area by many-fold. Over the past 10 years, my research team has established a commercially viable LED integrated vertical aeroponic farming system to grow different leafy vegetables under different LED spectra, intensities, and durations in the tropical greenhouse. The results demonstrate that it is possible to increase shoot production and rate of shoot production of leafy vegetables by increasing light intensity and extending the photoperiod under effective LED lighting. Furthermore, temperate vegetable crops such as lettuce were able to acclimate to high light intensity under supplementary LED lights to natural sunlight in the greenhouse. Supplementary LED lightings promote both leaf initiation and expansion with increased photosynthetic pigments, higher Cyt b 6 f and Rubisco protein contents on a per area basis and thus improve photosynthetic capacity and enhance productivity. Plants sense and respond to changes in their immediate environments (microclimate), manipulating the root zone temperature (RZT) and water supply will impact not only their growth and development but also their nutritional quality. Our on-going research aims to investigate if the nutritional quality of leafy vegetables could be improved under suboptimal RZT and mild water deficit through deficit irrigation. If substantial energy and water savings in urban farming can be achieved without substantial yield penalty but with higher nutritional quality, the amount of water and energy saved can bring substantial benefits to society.

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Aeroponics as a Plant Cultivation Technique with an Emphasis on Natural Resources Utilization Efficiency

da Silva,

Gheyi,

Silva

2024

Encyclopedia of Sustainability Science and Technology Series

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Root Morphology, Plant Growth, Nitrate Accumulation and Nitrogen Metabolism of Temperate Lettuce Grown in the Tropics with Elevated Root-Zone CO<sub>2</sub> at Different Root-Zone Temperatures

Abstract: This paper investigated the effects of root-zone (RZ) CO 2 concentration ([CO 2 ]) on root morphology and growth, nitrate ( These findings have practical significance to vegetable production by growing the vegetable crops at cool-RZT with elevated RZ [CO 2 ] to enhance its productivity.

Cited by 6 publications

References 35 publications

Effects of Elevated Root-Zone CO2 on Root Morphology and Nitrogen Metabolism Revealed by Physiological and Transcriptome Analysis in Oriental Melon Seedling Roots

Effects of Elevated Root-Zone CO2 on Root Morphology and Nitrogen Metabolism Revealed by Physiological and Transcriptome Analysis in Oriental Melon Seedling Roots

Microclimate control to increase productivity and nutritional quality of leafy vegetables in a cost-effective manner

Aeroponics as a Plant Cultivation Technique with an Emphasis on Natural Resources Utilization Efficiency

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