สืบค้นงานวิจัย
Comparison in Hydraulic Response to Water Stress Tolerance of Two Rubber Clones
Krissada Sangsing - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Comparison in Hydraulic Response to Water Stress Tolerance of Two Rubber Clones
ผู้แต่ง / หัวหน้าโครงการ (EN): Krissada Sangsing
บทคัดย่อ (EN): Water is probably single largest factor limiting agricultural productivity in general. Water stress is the most important factor that restricts the expansion of rubber into drought – prone regions. On the other hand, rubber plantation effected by flooding has been often encountered in marginal areas. Thus, Water stress tolerance clone became one of the requirements for specific regions. Physiological trait closely relating to water stress tolerance in plant is hydraulic property, especially xylem cavitation resistance. The mechanism for plant with regulation of water status results from avoidance of stress induced hydraulic failure via stomatal closure as representative of a hydraulic safety margin. In this study, two clones of rubber (RRIM 600 and RRIT 408) comparing in hydraulic traits were studied along with plant responses under water stress. An experiment was arranged in 1.2 year old tree, grown in 1 m3 pots filled with sandy loam soil, with 24 plants for each clone at Surat Thani Agricultural Research and Development Center, Southern Thailand during 2012 – 2013. All plants of each clone separated within 3 groups as follows: 1) control soil moisture content around 25% by volume all the time of experimental duration, 2) stop watering when experiment started and to prevent rainfall by covered the pots, and 3) water logging all the time of experimental duration. Stomatal conductance (gs) and leaf water potential (Yleaf) were decreased with period time after experimental started in both water stress conditions. The curve of percentage loss of xylem conductivity (PLC) vs xylem water tension represents the vulnerability of each clone in both stress conditions showed typical sigmoid fits. An estimate of xylem pressure at which embolism begins or 12% loss of conductivity occurs (P12), embolism causing 50% loss of conductivity occurs (P50), critical embolism level or 88% loss conductivity occurs (P88), xylem pressure at which 50% of stomatal closure (gs50) and safety margins were quantitative output from fitted curves result. RRIM 600 was showed more vulnerable to embolism than RRIT 408 as represented by less negative of P50, P88. and more PLC slope. Both clones showed similar behaviors of water saver by reducing stomatal conductance (gs) 50% at xylem pressure about -1.06 and -1.07 MPa in drought condition and -0.80 and -0.87 MPa in water logging condition for RRIM 600 and RRIT 408, respectively. Safety margin which representing degree of clonal desiccation tolerance, RRIT 408 was slightly greater than that of RRIM 600. Drought and water logging showed difference in vulnerability to cavitation of petiole segmentation. Less negative of xylem water tension to embolism in water logging condition than that in drought condition was found. It could be suggest that water logging situation was more serious problem than drought situation for young rubber tree.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): Rubber
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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Krissada Sangsing. "Comparison in Hydraulic Response to Water Stress Tolerance of Two Rubber Clones". ไม่ระบุหน่วยงาน. ม.ป.ป.

Krissada Sangsing. "Comparison in Hydraulic Response to Water Stress Tolerance of Two Rubber Clones". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Comparison in Hydraulic Response to Water Stress Tolerance of Two Rubber Clones
Krissada Sangsing
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
POTENTIAL OF INCREASING THE PLANTING DENSITY OF RUBBER IN SRI LANKA Aplication of osmoregulator substances to improve rubber plants tolerance to water stress STUDY ON THE POTENCY OF SERRATIA BACTERIA USED TO CONTROL WHITE ROOT DISEASE IN RUBBER Validation of Varietal Integrity of Promising Rubber Clones through DNA Finger Printing Evaluation of Rubber (Hevea brasiliensis) Modern Clones under Certain Stressful Climatic Conditions of Odisha The Role of Myanmar Rubber Planters and Producers Association (MRPPA) in Natural Rubber Development and its Recent Activities ECOPHYSIOLOGICAL RESPONSE OF YOUNG RUBBER BUDINGS TO DROUGHT STRESS PRELIMINARY PROOF CLONE TRIAL OF ORTET CLONES FROM BRAZIL JDM88 AGRO-VENTURES RUBBER BASED FARMING SYSTEM Nonlinear Viscoelsticity of Rubber Nanocomposites
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