Alleviation of high temperature stress in longan production using a hydrocooling approach
5
Issued Date
2024-09-01
Resource Type
ISSN
05677572
eISSN
24066168
Scopus ID
2-s2.0-85207256006
Journal Title
Acta Horticulturae
Volume
3
Issue
1404
Start Page
75
End Page
82
Rights Holder(s)
SCOPUS
Bibliographic Citation
Acta Horticulturae Vol.3 No.1404 (2024) , 75-82
Suggested Citation
Pichakum A., Suwannaruta W., Detpitthayanan S., Patanrach C., Tienthong P., Chintakovid W. Alleviation of high temperature stress in longan production using a hydrocooling approach. Acta Horticulturae Vol.3 No.1404 (2024) , 75-82. 82. doi:10.17660/ActaHortic.2024.1404.11 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/101834
Title
Alleviation of high temperature stress in longan production using a hydrocooling approach
Author's Affiliation
Corresponding Author(s)
Other Contributor(s)
Abstract
Growers of off-season longan (Dimocarpus longan Lour. ‘Phaung Thong’) in Samut Sakhon, central Thailand, must typically deal with problematic annual hot wind. Hot wind is characterized by a rapid increase in temperature of up to 50°C, which can decrease longan yield by almost 90%. Evaporative hydrocooling approaches (HCA) that shower fine droplets of water around the tree canopy have been reported to successfully reduce hot wind impacts in longan orchards. However, there is no supporting information on the physiological responses of longan affected by HCA. In this study, air temperature and canopy temperature under natural high temperatures experienced during the summer were monitored in the field. The results clearly show a reduction in day temperature after HCA in the longan orchard. Moreover, the microclimatic parameters and plant responses under simulated room conditions were investigated. One-year-old healthy potted longan trees were transferred to high temperature conditions at 50°C for 2 h prior to spraying with fine droplets of room temperature water for 20 s. It was found that HCA could reduce air temperature by 12°C and leaf temperature by 7°C, while increasing relative humidity by 12%. These changes led to a decrease in air vapor pressure deficit (VPD) and leaf VPD. An increase in stomatal conductance soon after HCA could promote net photosynthetic rates, transpiration rates, and water use efficiency of the longan tree. This study shows the effectiveness of HCA, which can be used to support the guidelines of HCA to reduce high temperature stress in longan to prevent the negative impacts of hot wind.