Improved Light Conditions at the Fruit Truss Accelerate Harvest Time and Enhance Ascorbic Acid Concentration in a Low-truss, High-density Tomato Production System

Johkan, Masahumi; Ishii, Minoru; Maruo, Toru; Lu, Na; Tsukagoshi, Satoru; Hojoh, Masa-aki; Nakaminami, Akio; Shinohara, Yoshinori

doi:10.2503/jjshs1.82.317

Cited by 12 publications

(9 citation statements)

References 21 publications

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“…Nonetheless, both cultivars contained slightly higher concentrations in summer than those harvested in winter, which is in accordance with Massot et al [84] and Roselló et al [85]. Seasonal variations in ascorbate levels have been attributed to gene expression of biosynthesis and recycling, regulated by the interaction of temperature and light during the season [86,87].…”

Section: Influence Of Root Cooling On Bioactive Compoundssupporting

confidence: 88%

Effects of Root Cooling on Plant Growth and Fruit Quality of Cocktail Tomato during Two Consecutive Seasons

Fang

Thiele

Watt

et al. 2019

Journal of Food Quality

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Understanding the effects of root temperature on plant growth and key food components of horticultural crops under greenhouse conditions is important. Here, we assess the impact of root cooling on plant growth and fruit quality of two cocktail tomato cultivars (Lycopersicon esculentum cv “Amoroso” and cv “Delioso”) during the winter of 2017-2018 and the summer of 2018. Plants were grown hydroponically on rockwool under different root temperatures (16–27°C and 10°C) from the 2nd inflorescence to harvest inside the greenhouse. A root temperature of 10°C was controlled independently from air temperature (18–23°C in winter and 21–29°C in summer) by circulating cooling water. Reductions of marketable yield per plant (7.9–20.9%) in both cultivars were observed in response to root cooling in winter, but not significantly in summer. In most cases, root cooling had a positive effect on the functional quality (sugars, vitamin C, and carotenoids levels). In the case of “Delioso,” glucose concentration increased by 7.7–10.3%, vitamin C by 20–21%, and lycopene by 16.9–20.5% in both seasons. “Amoroso” exhibited only higher consistent values in glucose with increments between 6.9 and 7.8% in the two seasons. The levels of elements decreased by root cooling, with statistically significant reduction of N, P, S, and Fe by 12.1–15.7% in “Delioso” in winter and P and Zn by 9.1–22.2% in both cultivars in summer. Thus, manipulation of root temperature could be a feasible method to improve the overall fruit quality of cocktail tomato; however, this effect was also dependent on cultivars and other environmental factors.

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Section: Influence Of Root Cooling On Bioactive Compoundssupporting

confidence: 88%

Effects of Root Cooling on Plant Growth and Fruit Quality of Cocktail Tomato during Two Consecutive Seasons

Fang

Thiele

Watt

et al. 2019

Journal of Food Quality

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“…The cultivation method mainly focuses on relatively short plant heights, such as picking the meristem at the 6 th to 8 th stages, or continuous pinching cultivation. In recent years, a low-node and high-density planting system has attracted attention as a unique Japanese cultivation system for stable production (Lu et al, 2012;Johkan et al, 2013;Kinoshita et al, 2014;Tewolde et al, 2016). This system could enable selection of tomato cultivars throughout the year and reduce the risk of disease and pest incidence.…”

Section: Introductionmentioning

confidence: 99%

Effect of Salinity on Photosynthesis and Distribution of Photosynthates in the Japanese Tomato ‘CF Momotaro York’ and the Dutch Tomato ‘Endeavour’ with Low Node-order Pinching and a High-density Planting System

et al. 2020

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In this study, we investigated the effect of salinity on photosynthesis and the distribution of photosynthates in the Japanese tomato (Solanum lycopersicum) cultivar 'CF Momotaro York' and the Dutch cultivar 'Endeavour'. Although significant differences were not observed in fresh yield among the cultivars, there were significant differences between the control and salinity in terms of fresh yield, total soluble solids, and titratable acid. The total dry weight in the Japanese cultivar was not affected by salinity, but the Dutch cultivar had lower total weight under salinity compared to the control. Regarding dry mass partitioning, the Japanese cultivar had a lower dry mass ratio of vegetative organs and a higher ratio of fruits than the Dutch cultivar. Salinity did not affect the photosynthetic rate in the Japanese cultivar, but did affect the Dutch cultivar, possibly due to water use efficiency. These results indicate that this Japanese cultivar has characteristics of efficient fruit production under a low node-order pinching and high-density planting system, even under salinity conditions.

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“…Plants were pinched off just below the second truss, and all lateral shoots were removed. After pinching, planting beds were wired opposite the fruit truss, and leaves were pulled back and attached to the wire to expose the first-truss fruits (Johkan et al, 2013). At anthesis, the flower truss was sprayed with 4-chlorophenoxyacetic acid (Tomato Tones; ISK Biosciences, Tokyo, Japan).…”

Section: Introductionmentioning

confidence: 99%

Effect of Moderate Salinity Stress on the Sugar Concentration and Fruit Yield in Single-truss, High-density Tomato Production System

Johkan

Nagatsuka

Yoshitomi

et al. 2014

J. Japan. Soc. Hort. Sci.

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To produce tomato fruits with 6% average Brix without decreasing yield, we investigated the effect of moderate salinity stress on Brix and yield in a single-truss, high-density tomato production system. Because tomato fruit development can be predicted from cumulative temperature, we also assessed cumulative temperature after anthesis as a potential indicator for determining the starting points of salinity stress treatments. When transverse diameters of the first fruit reached 4 cm (i.e., early increase treatment) or the first fruits were at the mature green stage (i.e., late increase treatment), nutrient solution electrical conductivity was slowly increased until the breaker stage from 1.8 dS·m -1 to 6.0 dS·m -1. Plants subjected to the late increase treatment produced tomato fruits with Brix values of 6% without reductions in marketable yield. We also increased nutrient solution electrical conductivity based on cumulative temperature after anthesis and found that early-treated plants produced tomatoes with higher Brix levels and yields than late-treated plants. In summary, moderate salinity stress to avoid excessive stress on plants increased sugar concentrations without decreasing fruit yield and resulted in tomato fruits with average Brix of about 6% when nutrient solution electrical conductivity was increased at a rate of 0.1 dS·m. Because seasonal differences in cumulative temperature influence the appropriate timing of salinity stress applications, further study is needed to optimize year-round growth under moderate salinity stress in single truss, high-density tomato production systems.

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Improved Light Conditions at the Fruit Truss Accelerate Harvest Time and Enhance Ascorbic Acid Concentration in a Low-truss, High-density Tomato Production System

Cited by 12 publications

References 21 publications

Effects of Root Cooling on Plant Growth and Fruit Quality of Cocktail Tomato during Two Consecutive Seasons

Effects of Root Cooling on Plant Growth and Fruit Quality of Cocktail Tomato during Two Consecutive Seasons

Effect of Salinity on Photosynthesis and Distribution of Photosynthates in the Japanese Tomato ‘CF Momotaro York’ and the Dutch Tomato ‘Endeavour’ with Low Node-order Pinching and a High-density Planting System

Effect of Moderate Salinity Stress on the Sugar Concentration and Fruit Yield in Single-truss, High-density Tomato Production System

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