สืบค้นงานวิจัย
CLONAL VARIATION ON XYLEM EMBOLISM AND PLANT WATER STATUS UNDER DROUGHT CONDITION OF YOUNG RUBBER TREE
Ratchanee Rattanawong - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): CLONAL VARIATION ON XYLEM EMBOLISM AND PLANT WATER STATUS UNDER DROUGHT CONDITION OF YOUNG RUBBER TREE
ผู้แต่ง / หัวหน้าโครงการ (EN): Ratchanee Rattanawong
บทคัดย่อ (EN): Rubber plantation in the non-traditional area (North-eastern part of Thailand) exhibits growth reduction, longer immaturity period and lower latex production compared to traditional area (Southern Thailand). In order to improve rubber cultivation for these areas, more drought-efficient tree and acclimatized clone has been developed. The objective of this study was to assess the genetic variability for rubber responding to water stress. This experiment was set up at Nongkhai Rubber Research Center (NRRC), Thailand. Grafted saplings of 10 interested rubber clones (BPM 24, PB 217, PB 235, PB 260, PB 5/51, RRII 105, RRII 118, RRIM 600, RRIT 251, and RRIT 408) were transplanted in 0.93 m3 pots. Trees were divided into 2 groups; (i) control trees, they were well-watered throughout the experimental period and (ii) treatment trees were submitted to soil drying cycle. Data on growth and development traits such as girth and height of the trees were collected, while data on hydraulic traits such as leaf water potential, stomatal conductance, and percent lost of conductivity are collected for the analysis of plant responses to water deficit. Girth showed significantly difference among clones; RRIT 251 and RRIT 105 were highest girth (4.13 cm) compared with the lowest (PB 217=2.83 cm) on the 5th week after watering withheld. The stomatal conductance of leaf was highly significant different among 10 clones started from the 1st week after experiment started. The percent of xylem conductivity (PLC) of the petiole increased with drought period time. It showed significantly different and separating into 2 contrasted group; PB 5/51, RRIT 251 and RRIT 408 (PLC=60.25 to 61.50%) compared with BPM 24 (26.20%) at the 6th week after drought onset. By the 11th week after drought onset, high embolism rate was achieved for all clones (PLC=74.98 to 87.07%). Significantly different on midday leaf water potential (Ψm) were only observed on the 9th and 11th week for the clones with most contrasted Ψm values. The RRII 118 appeared to be the clone with the largest safety margin (1.51), whiles RRIT 251 and RRIM 600 those have narrowest safety margin (0.19 and 0.21 respectively). Large safety margin of RRIT 118 was a result of high resistance to xylem cavitation and high gs 50 value (-0.59 MPa) (avoiding water deficit by closed their stomata earlier than other clones). These results suggested that this clone has higher drought tolerance potential.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): status
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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การอ้างอิง

Ratchanee Rattanawong. "CLONAL VARIATION ON XYLEM EMBOLISM AND PLANT WATER STATUS UNDER DROUGHT CONDITION OF YOUNG RUBBER TREE". ไม่ระบุหน่วยงาน. ม.ป.ป.

Ratchanee Rattanawong. "CLONAL VARIATION ON XYLEM EMBOLISM AND PLANT WATER STATUS UNDER DROUGHT CONDITION OF YOUNG RUBBER TREE". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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CLONAL VARIATION ON XYLEM EMBOLISM AND PLANT WATER STATUS UNDER DROUGHT CONDITION OF YOUNG RUBBER TREE
Ratchanee Rattanawong
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
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