Some selected physiological and biochemical responses in organically and conventionally grown tea (Camellia sinensis (L.) O. Kuntze) to increased ambient temperature

Nissanka Sarath Premalal, . and Widulanka Amarasinghe Kadawatha Arachchi Kankanamge Shashi, . and Jayawardhana Amuwala Devage Induni Umeshika, . and Wijeratne Thushari Lakmini, . and Mohotti Anoma Janaki, . and Mohotti Keerthi Meepe, . Some selected physiological and biochemical responses in organically and conventionally grown tea (Camellia sinensis (L.) O. Kuntze) to increased ambient temperature. pp. 78-84. ISSN 2462-1757

This study was conducted to elucidate responses on some selected physiological soil and biochemical parameters of organically and conventionally managed mature tea plants to variations in ambient temperature. Increased temperature (2- 4 oC increase) was simulated via structures that fully enclosed tea bushes with transparent polythene which were compared with open (ambient temperature average daily temperature around 19 oC) field grown tea in the TRI-ORCON long-term organic and conventional comparison trial Tea Research Institute Talawakelle Sri Lanka. Some selected physiological growth soil and biochemical parameters were monitored and data were analyzed by General Linear Model. Increasing ambient temperature under both organic and conventional systems increased photosynthesis stomatal conductance transpiration and specific leaf area. This could be due to the elevated temperature exposing the canopy to conducive temperature within the optimum range. However water use efficiency leaf total polyphenol content and yield components measured as shoot dry weight were reduced with increasing temperature. The specific leaf area increased with increased temperature but this increase was significantly less with the organic system indicating possibility of better water use efficiency in plants. There was no significant difference between the two systems with the other measured parameters. The results depicted that with further evaluation organic tea cultivation may be highlighted as a precautionary measure to reduce the negative impacts of increasing ambient temperature to ensure sustainability of tea.

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Abstract

This study was conducted to elucidate responses on some selected physiological soil and biochemical parameters of organically and conventionally managed mature tea plants to variations in ambient temperature. Increased temperature (2- 4 oC increase) was simulated via structures that fully enclosed tea bushes with transparent polythene which were compared with open (ambient temperature average daily temperature around 19 oC) field grown tea in the TRI-ORCON long-term organic and conventional comparison trial Tea Research Institute Talawakelle Sri Lanka. Some selected physiological growth soil and biochemical parameters were monitored and data were analyzed by General Linear Model. Increasing ambient temperature under both organic and conventional systems increased photosynthesis stomatal conductance transpiration and specific leaf area. This could be due to the elevated temperature exposing the canopy to conducive temperature within the optimum range. However water use efficiency leaf total polyphenol content and yield components measured as shoot dry weight were reduced with increasing temperature. The specific leaf area increased with increased temperature but this increase was significantly less with the organic system indicating possibility of better water use efficiency in plants. There was no significant difference between the two systems with the other measured parameters. The results depicted that with further evaluation organic tea cultivation may be highlighted as a precautionary measure to reduce the negative impacts of increasing ambient temperature to ensure sustainability of tea.

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Item Type:	Article
AGROVOC Term:	Camellia sinensis
AGROVOC Term:	Tea
AGROVOC Term:	Organic farming
AGROVOC Term:	Physiological response
AGROVOC Term:	Experimental design
AGROVOC Term:	Data collection
AGROVOC Term:	Data analysis
AGROVOC Term:	Metabolites
AGROVOC Term:	Climate change
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/10584

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