Rubber Trees Affected by Necrotic Tapping Panel Dryness Exhibit Poor Transpiration Regulation under Atmospheric Drought

Supat Isarangkool Na Ayutthaya; Frederic C. Do

doi:10.4028/www.scientific.net/AMR.844.3

Paper Titles

Rubber Trees Affected by Necrotic Tapping Panel Dryness Exhibit Poor Transpiration Regulation under Atmospheric Drought
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The Influence of Rainfall on Growth of Rubber Trees in Marginal Area of Northeast Thailand
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Responses of Chlorophyll Fluorescence, Stomatal Conductance, and Net Photosynthesis Rates of Four Rubber (Hevea brasiliensis) Genotypes to Drought
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Starch Synthesis and Mobilization in Wood and Bark of Rubber Tree, in Relation with Latex Production, (1) Methodological Approach
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A Simple Water Balance Model of Rubber Tree Plantations under Different Evaporative Demand Regimes
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Resilience of Rubber-Based Intercropping System in Southern Thailand
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The Current Status and Future Trends of Farm Production and Marketing of Para-Rubber in the Upper East Coast Provinces of Southern Thailand
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A Comparative Analysis of Smallholders Tapping Practices in Four Rubber Producing Regions of Thailand
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 844Rubber Trees Affected by Necrotic Tapping Panel...

Rubber Trees Affected by Necrotic Tapping Panel Dryness Exhibit Poor Transpiration Regulation under Atmospheric Drought

Abstract:

The objective was to study the responses in water status and transpiration regulation of rubber trees affected by the necrotic Tapping Panel Dryness (N) by comparison with healthy trees (H). The experiment was done with 5 N trees and 5 H trees of clone RRIM600 during well soil watered periods differing in evaporative demand intensity, May and August 2007. The study compared predawn leaf water potential (ψ_pd), midday leaf water potential (ψ_mid), whole tree hydraulic conductance (K), midday sapflow density (J_s) and tree transpiration (E_T) with the average girth size 51.54 cm of H tree and 52.66 cm of N tree. These variables, investigated in the high evaporative demand day (ET_O = 3.71 mm day^-1) on 23 May 2007 and low evaporative demand day (ET_O = 1.75 mm day^-1) on 22 Aug 2007, did not significantly differ between tree types. However, over a long period, in high evaporative demand, E_T tended to be higher in N trees. Expression of E_T versus ET_O confirmed different relationships between the two tree types with a higher plateau of maximum transpiration for N trees. Our results suggested that individuals with relatively poor transpiration regulation could be more sensitive to necrotic Tapping Panel Dryness syndrome.

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Advanced Materials Research (Volume 844)

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3-6

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https://doi.org/10.4028/www.scientific.net/AMR.844.3

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November 2013

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Supat Isarangkool Na Ayutthaya, Frederic C. Do

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Hevea brasiliensis, Tapping Panel Dryness, Transpiration, Xylem Sap Flux Density

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