Root-zone Cooling at High Air Temperatures Enhances Physiological Activities and Internal Structures of Roots in Young Tomato Plants

Kawasaki, Yasushi; Matsuo, Satoshi; Suzuki, Katsumi; Kanayama, Yoshinori; Kanahama, Koki

doi:10.2503/jjshs1.82.322

Cited by 18 publications

(24 citation statements)

References 25 publications

(33 reference statements)

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“…3). We found no significant positive correlation between the root IAA concentration and root RGR, unlike in our previous study (Kawasaki et al, 2013).…”

Section: Determination Of Iaa and Mineral Concentrationscontrasting

confidence: 99%

“…We measured the root IAA concentration because we found a correlation between this variable and root RGR with root-zone cooling under high air temperature in our previous study (Kawasaki et al, 2013). In Arabidopsis, IAA promotes root growth (Novickienė et al, 2010;Ohashi-Ito et al, 2013) and xylem development (Deng et al, 2012;Ohashi-Ito et al, 2013).…”

Section: Discussionmentioning

confidence: 96%

“…In contrast, inhibition of nutrient uptake and decreased shoot mineral concentrations have been reported under a low root-zone temperature (Gosselin and Trudel, 1983b;Kabu and Toop, 1970) and our results for the control support these previous findings. In addition, increased nutrient uptake under an optimal rootzone temperature was reported after root-zone cooling at high air temperature (Kawasaki et al, 2013).…”

Section: Discussionmentioning

confidence: 98%

“…N was measured using a CN analyzer (JM1000CN; J-Science Lab Co., Ltd., Kyoto, Japan). For analysis of the indole-3-acetic acid (IAA) content, fresh roots (n = 4) were sampled using the same method as in our previous study (Kawasaki et al, 2013).…”

Section: Mineral Nutrient Analysis and Quantification Of Auxin Contentmentioning

confidence: 99%

“…In our previous study, we examined the effect of root-zone cooling at high air temperature (Kawasaki et al, 2013). We found that root growth and root activity were enhanced by root-zone cooling, leading to subsequent promotion of shoot growth.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Root-zone Heating on Root Growth and Activity, Nutrient Uptake, and Fruit Yield of Tomato at Low Air Temperatures

Kawasaki

Matsuo

Kanayama

et al. 2014

J. Japan. Soc. Hort. Sci.

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Low-cost heating is needed to reduce chilling injuries, heating costs, and CO 2 emission during greenhouse tomato production. To acquire information about the physiological and morphological effects of root-zone heating, an economical option at low air temperatures, we grew tomato plants on a nutrient film technique hydroponic system in a heated nutrient solution. We investigated the effects of short-term root-zone heating after transplanting and long-term heating until harvest. We measured short-term plant growth, nutrient uptake, root activity (xylem exudation and root respiration rates), root indole-3-acetic acid (IAA) concentration, internal root structure, and long-term fruit weight and dry matter distribution. The minimum root-zone temperature was maintained at 16.6°C, while the minimum air temperature (5.9°C) and the minimum root-zone temperature in the control (5.8°C) were lower than optimal. After 7 days of root-zone heating, root dry weight and relative growth rate increased compared with those of the control, accompanied by increased mineral nutrient uptake and xylem exudation. These changes may explain the increased shoot growth after 21 days of heating. In roots, development of the epidermis and stele, including the xylem, was promoted by heating, in contrast to previous research on root-zone cooling at high air temperature, which promoted xylem-specific development. Although the proportion of dry matter distributed to the fruit was not changed by root-zone heating, individual fruit size and total yield were higher than in the control due to a higher total dry weight in the heating treatment. Our results suggest that root-zone heating is an effective lowcost heating technology at low air temperature because of its effects on root activity, growth, and fruit yield, but that the mechanisms may differ from those in root-zone cooling at high air temperature.

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“…3). We found no significant positive correlation between the root IAA concentration and root RGR, unlike in our previous study (Kawasaki et al, 2013).…”

Section: Determination Of Iaa and Mineral Concentrationscontrasting

confidence: 99%