Acoustic Emissions in Tomato Plants under Water Stress Conditions

Japan Agricultural Research Quarterly
ISSN 00213551
NII recode ID (NCID) AA0068709X
Full text
36-02-06.pdf334.33 KB

Acoustic emissions (AE) could be used as an indicator of plant water stress as “speaking plant”. The objective of this study was to observe the AE of tomato plant and to analyze the relationship between AE and plant water consumption associated with transpiration. Three glasshouse experiments were conducted with potted tomato plants. The AE, transpiration rate and “the plant transpiration transfer coefficient (hat)” as an indicator of plant water stress level were determined with hat being calculated based on sunlit leaf temperature, temperature of an artificial leaf without transpiration (hereafter, referred to as “non-transpiration leaf temperature”) and air temperature. The results showed that the daily patterns of the AE varied depending on the water stress level, which was indicated by hat. Under mild or moderate water stress (hat ≦0) conditions, the AE increased with the decrease in the amount of soil water but decreased with the decrease in the amount of soil water under severe water stress conditions (0<hat≦1). To analyze the hourly changes in the relationship between AE and transpiration, the concept of “change of transpiration rate (AT)” was introduced. Under mild or in the absence of water stress conditions (hat ≦ 0), AE increased linearly with the increase of AT with a significant regression coefficient (r2 = 0.85 and slope = 0.61). Then, as the water stress level increased, the r2 gradually decreased, as well as the slope of the regression line between AE and AT. When the water stress level increased further, the slope continuously decreased. However, r2started to increase gradually. Thus, when the water stress increased to a critical level (0<hat≦1), a significant inverse linear relationship between AE and AT, with r2 = 0.64 and slope = –0.73 could be observed. On the basis of these results, AE tended to be differently affected by AT depending on the water stress level.

Date of issued
Creator QIU Guo Yu OKUSHIMA Limi SASE Sadanori LEE In-Bok
Subject

change of transpiration rate

transpiration

transpiration transfer coefficient

Publisher Japan International Research Center for Agricultural Sciences
Available Online
NII resource type vocabulary Journal Article
Volume 36
Issue 2
spage 103
epage 109
DOI 10.6090/jarq.36.103
Rights Japan International Research Center for Agricultural Sciences
Language eng

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