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Effects of root-zone temperature on Photosynthesis, Productivity and Nutritional Quality of Aeroponically Grown Salad Rocket (Eruca sativa) Vegetable

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American Journal of Plant Sciences 2016年第14期7卷 1993-2005页

作者： Jie He Xin Er See Lin Qin Tsui Wei Choong Natural Sciences and Science Education Academic Group National Institute of Education Nanyang Technological University Singapore

Although tropical high ambient temperature and humidity severely reduced the productivity of temperate plants, temperate vegetable crops such as lettuce have been successfully grown in Singapore by only cooling its root-zone. In this paper, a cool Meditteranean vegetable, Eruca sativa, was studied to understand how different RZTs can impact its shoot productivity, photosynthesis and nutritional quality. All plants were cultivated using aeroponic systems in a tropical greenhouse under hot ambient conditions where roots were subjected to four different root-zone temperatures (RZTs) of 20°C-RZT, 25°C-RZT, 30°C-RZT and fluctuating ambient temperatures ranged from 25°C to 38°C [25°C/38°C (ambient)]-RZT. Parameters studied include shoot fresh weight (FW), photosynthetic gas exchange, midday chlorophyll (Chl) fluorescence Fv/Fm ratio, Chl fluorescence photochemical quenching (qP), non-photochemical quenching (qN) and electron transport rate (ETR), total phenolic compounds and mineral content such as potassium (K), calcium (Ca), magnesium (Mg) and iron (Fe). Among the 4 different RZT treatments, E. sativa plants grown under ambient-RZT (25/38°C-RZT) had the lowest shoot and root FW while those plants grown under 20°C-RZT had highest productivity of shoot and root. However, there were no significant differences in shoot and root FW in plants grown at 25°C- and 30°C-RZT. Compared to plants grown under 25°C/38°C (ambient-RZT), light-saturated photosynthetic CO2 assimilation rate (Asat) and stomatal conductance (gssat) were similarly higher in 20°C-, 25°C- and 30°C-RZT. All plants had midday Chl fluorescence Fv/Fm ratio lower than <0.8 ranged from 0.785 to 0.606 with the highest and lowest ratios recorded in 20°C-RZT and ambient-RZT plants, respectively. These results indicate that cooling the RZ of E. sativa plants protected their PS

关键词： Chlorophyll Fluorescence Dietary Minerals root-zone temperature Phenolic Compounds Photosynthetic CO2 Assimilation Rate Stomatal Conductance

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root Morphology, Plant Growth, Nitrate Accumulation and Nitrogen Metabolism of Temperate Lettuce Grown in the Tropics with Elevated root-zone CO₂ at Different root-zone temperatures

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American Journal of Plant Sciences 2016年第14期7卷 1821-1833页

作者： Jie He Lin Qin Sing Kong Lee Natural Sciences and Science Education Academic Group National Institute of Education Nanyang Technological University Singapore

This paper investigated the effects of root-zone (RZ) CO2 concentration ([CO2]) on root morphology and growth, nitrate (NO3-) uptake and assimilation of lettuce plants at different root-zone temperatures (RZT). Elevated RZ [CO2] stimulated root development, root and shoot growth compared to ambient RZ [CO2]. The greatest increase in root growth was observed in plants grown under elevated RZ [CO2] of 50,000 ppm. However, RZ [CO2] of 10,000 ppm was sufficient to achieve the maximal leaf area and shoot productivity. Lettuce plants exhibited faster shoot and root growth at 20°C-RZT than at ambient (A)-RZT. However, under elevated RZ [CO2], the magnitude of increased growth was greater at A-RZT than at 20°C-RZT. Compared to RZ [CO2] of 360 ppm, elevated RZ [CO2] of 10,000 ppm increased NO3- accumulation and nitrate reductase activity (NRA) in both leaves and roots. NO3- concentrations of leaf and root were higher at 20°C-RZT than at A-RZT in all plants. NRA was higher in root than in leaf especially under A-RZT. The total reduced nitrogen (TRN) concentration was significantly higher in plants grown under elevated RZ [CO2] of 10,000 ppm than under ambient RZ [CO2] of 360 ppm with greater concentration in 20°C-RZT plants than in A-RZT plants. These results imply that elevated RZ [CO2] significantly affected root morphology, root and shoot growth and N metabolism of temperate lettuce with greater impacts at A-RZT than at 20°C-RZT. These findings have practical significance to vegetable production by growing the vegetable crops at cool-RZT with elevated RZ [CO2] to enhance its productivity.

关键词： Lettuce Nitrate Assimilation Nitrate Uptake root Morphology root-zone CO2 root-zone temperature

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

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International Journal of Agricultural and Biological Engineering 2022年第3期15卷 55-61页

作者： Jie He Lin Qin National Institute of Education Nanyang Technological University637616Singapore

Food security is one of the key global challenges in this *** Singapore,our research team has been using novel aeroponic technology to produce fresh vegetables since *** 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 *** 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 *** 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 *** 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 ***,temperate vegetable crops such as lettuce were able to acclimate to high light intensity under supplementary LED lights to natural sunlight in the *** LED lightings promote both leaf initiation and expansion with increased photosynthetic pigments,higher Cyt b6f and Rubisco protein contents on a per area basis and thus improve photosynthetic capacity and enhance *** 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 *** on-going research aims to investigate if the nutritional quality of leafy vegetables could be improved under suboptimal RZT and mild water

关键词： leaf vegetables LED lighting microenvironment nutrient spraying intervals nutritional quality photosynthetic performance productivity root-zone temperature

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