Photosynthetic Changes and Growth of Paprika Transplants as Affected by Root-zone Cooling Methods under High Air Temperature Conditions after Transplanting

Byungkwan Lee; Minh Duy Pham; Jaewook Shin; Meiyan Cui; Hyein Lee; Jeesang Myung; Haeyoung Na; Changhoo Chun

doi:10.7235/HORT.20220061

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2022 Vol.40, Issue 6 Preview Page Next Page

Research Article

Photosynthetic Changes and Growth of Paprika Transplants as Affected by Root-zone Cooling Methods under High Air Temperature Conditions after Transplanting

31 December 2022. pp. 672-688

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Abstract

To overcome high mid-summer air temperatures in South Korea, the effects of two root-zone cooling (RZC) methods on the leaf photosynthesis and growth of paprika transplants were investigated using a growth chamber. Paprika (Capsicum annuum L. cv. Scirocco) transplants grown in 20-cm pots filled with coir under a 14 h·d^-1 photoperiod (from 5 am to 7 pm) were exposed to an air temperature of 39°C during the heating period (HP) from 11 am to 4 pm every day for 28 days. During the HP, the plants were irrigated with a chilled nutrient solution (15°C) for 3 min every hour as a nutrient solution cooling (NSC) treatment and chilled water (15°C) was circulated through the silicone pipes coiled around the root zones in a water circulation cooling (WCC) treatment. No cooling was provided for the No-cooling treatment. Root-zone medium temperatures in the NSC and WCC during HP decreased by 4°C and 8°C, respectively, compared to the No-cooling treatment. Twenty-eight days after the treatment, the root dry weight was 10-20% greater in RZCs compared to the No-cooling treatment, the root dry weight distribution was greatest, and the electrolyte leakage was lowest in the NSC. Leaf photosynthesis in both RZCs was 30% greater than in the No-cooling from a photosynthetic photon flux density of 250 µmol·m^-2·s^-1 during HP. The findings here indicate that NSC is more efficient than WCC and that it can alleviate the adverse effects of a high air temperature. Hence, it can be applied to improve paprika transplant production in greenhouses during the summer.

Keywords

chlorophyll fluorescence

dry weight distribution

heat stress

nutrient solution cooling

root viability

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Information

Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
Publisher(Ko) :원예과학기술지
Journal Title :Horticultural Science and Technology
Journal Title(Ko) :원예과학기술지
Volume : 40
No :6
Pages :672-688
Received Date : 2022-08-22
Revised Date : 2022-10-11
Accepted Date : 2022-10-27
An Erratum to this article was published on 28 February 2023.

This article has been updated.
DOI :https://doi.org/10.7235/HORT.20220061

Horticultural Science and Technology ISSN:1226-8763(Print) 2465-8588(Online) 원예과학기술지

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