สืบค้นงานวิจัย
Drought and Trunk Phloem Necrosis (TPN) Effects on Water Status and Xylem Sap Flow of Hevea brasiliensis
Supat Isarangkool Na Ayutthaya - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Drought and Trunk Phloem Necrosis (TPN) Effects on Water Status and Xylem Sap Flow of Hevea brasiliensis
ผู้แต่ง / หัวหน้าโครงการ (EN): Supat Isarangkool Na Ayutthaya
บทคัดย่อ (EN): The aim of this work was to study the effect of a soil drought during the wet season on the water status and xylem sap flow density of mature rubber trees. Part of a wider multi-disciplinary research program, this study distinguished healthy tapped trees and trees affected by Trunk Phloem Necrosis (TPN) to test if the latter differed in their response to a soil water constraint. The experiment was conducted in a plot of RRIM600, planted at 2.5m x 7.0m spacing and tapped for four years. The plantation is located at Baan Sila, Khu-Muang, Bureerum, a dry area of northeast Thailand with a dry season of five months and an average annual rainfall of 1170 mm. Environmental conditions (weather and soil water content), leaf water potential (predawn and midday values) and xylem sap flow density (transient thermal dissipation method) were monitored from the onset to the core of the wet season in 2007. Three periods of contrasted soil water content and similar ranges of evaporative demand were selected for the analysis of the effect of soil drought: late May (onset of rainy season), late July (soil drought) and early August (recovery). Our results showed highly significant changes in the predawn leaf water potential (pd) and in the maximum density of xylem sap flow during the July soil drought. Maximum density of xylem sapflow was a good indicator of the daily cumulated sap flow, which is closely related to daily tree transpiration. The overall relationship between maximum daily sap flow per sap wood area and pd showed a significant positive trend. No significant differences were observed between healthy and TPN trees in leaf water potential and xylem sap flow. The next step of this work will compare a water constraint in the wet and dry season, and set up an experiment with continuous measurement able to capture a sporadic hydraulic failure related to the water exchange between xylem and phloem.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): wet season.
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

การอ้างอิง

Supat Isarangkool Na Ayutthaya. "Drought and Trunk Phloem Necrosis (TPN) Effects on Water Status and Xylem Sap Flow of Hevea brasiliensis". ไม่ระบุหน่วยงาน. ม.ป.ป.

Supat Isarangkool Na Ayutthaya. "Drought and Trunk Phloem Necrosis (TPN) Effects on Water Status and Xylem Sap Flow of Hevea brasiliensis". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Drought and Trunk Phloem Necrosis (TPN) Effects on Water Status and Xylem Sap Flow of Hevea brasiliensis
Supat Isarangkool Na Ayutthaya
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
Sap Flow and Water Status in Adult Rubber Trees Coupling Effects of Water and Fertilizers on Latex Yield of Hevea brasiliensis CLONAL VARIATION ON XYLEM EMBOLISM AND PLANT WATER STATUS UNDER DROUGHT CONDITION OF YOUNG RUBBER TREE Expression of NAC Transcription Factor under Drought Stress in Hevea brasiliensis Real-time Measuring Phloem Turgor Pressure in Hevea brasiliensis Indicates a Rapid Water Exchange between Laticifers and Surrounding Tissues CLONAL VARIABILITY IN THE INCLINATION OF LATICIFERS AND PHLOIC RAYS IN HEVEA BRASILIENSIS IMPROVEMENT AND APPLICATION OF THE TECHNIQUE OF MINI-SEEDLING BUDDING OF HEVEA BRASILIENSIS IDENTIFICATION OF DROUGHT TOLERANT GENES BY QUANTITATIVE EXPRESSION ANALYSIS IN HEVEA BRASILIENSIS THE YIELD AND QUALITY OF RUBBER (HEVEA BRASILIENSIS) AS AFFECTED BY IRRIGATION AND FERTILIZER APPLICATIONS Yield Modeling and Analysing the Critical Factors of Productivity of Natural rubber (Hevea brasiliensis)
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