สืบค้นงานวิจัย
Impacts of Water Stress on Gas Exchange, Water Relations and Chlorophyll Content in Five Hevea brasilensis Clones
Noorliana Mohd Zan - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Impacts of Water Stress on Gas Exchange, Water Relations and Chlorophyll Content in Five Hevea brasilensis Clones
ผู้แต่ง / หัวหน้าโครงการ (EN): Noorliana Mohd Zan
บทคัดย่อ (EN): Five Hevea brasiliensis clones were used that is RRIM 929, RRIM 2002, RRIM 2008, RRIM 2014, RRIM 3001 in the first and second experiment when they were 3 months old or at two whorls hardened of leaves. Leaf gas exchange were measurement used a closed system of infra-red gas analyzer LICOR 6400 Portable Photosynthesis System (IRGA: LICOR Inc. Nebraska, USA). Fully expanded leaves were used to record net photosynthesis rate (Anet), stomata conductance (gs), transpiration rate (E) and intercellular CO2 concentration (Ci). Instantaneous water use efficiency (WUE) was calculated by dividing the net photosynthesis rate (A) by transpiration rate (E). The leaf used for stomatal conductance measurement was chosen for leaf water potential (pL) determination using the pressure chamber (Skye, plant moisture vessel, SKPM 1400 Series, UK) and Chlorophyll content was estimated following the method of witham et.al., (1986) to get the chlorophyll a, chlorophyll b and total chlorophyll measurement. The soil moisture was measured by Moisture Meter type HH2 (Delta-T Devices with Theta Probe sensor. In the well watered treatment, the soil remained 39.9% throughout the experiment suggesting that plants did not suffer any moisture stress. The soil moisture in the water stress treatment given progressively decreased with days of withholding water. After seven days of no watering, the soil moisture in the water stress treatment was significantly lower than that in the well watered or irrigated treatment. Leaf water potential (pL), stomata conductance (gs), net photosynthesis (A), transpiration rate (E) and water use efficiency (WUE) of well watered or irrigated plants remained between 0.74 to 0.79 Mpa, 0.74 to 0.79molH²O/m²/s, 2.6 to 2.8 μmolCO²/m²/s, 2 to 2.5mmol/m²/s and 1.2 to 1.0 ìmol(CO2) mmol> ¹ (H2O), respectively throughout the drying period. However, the pL, gs, A, E and WUE of stress treatment decreased rapidly as the duration of withholding water increased. By the seventh and fourteenth day of withholding water, the pL, gs, A, E and WUE of stress plants dropped which significantly lower than that of the well watered or irrigated plants. Relationship between soil moisture content (SMC) among the variables during the whole water stress period of the five Hevea clones. There was a polynomial function relationship between SMC (%) with A and gs in all clones. SMC explained 67%, 84%, 83%, 72% and 74% of the variability in A in RRIM 929, RRIM 2002, RRIM 2008, RRIM 2014 and RRIM 3001, respectively and SMC explained 55%, 67%, 60%, 57% and 55% of the variability in gs in RRIM 929, RRIM 2002, RRIM 2008, RRIM 2014 and RRIM 3001, respectively. There was strong linear relationship between SMC with E and pL in all five clones. The SMC explained 88%, 88%, 86%, 78% and 84% of the variability in E in RRIM 929, RRIM 2002, RRIM 2008, RRIM 2014 and RRIM 3001, respectively and SMC explained 90%, 84%, 91%, 77% and 83% of variability in pL in RRIM 929, RRIM 2002, RRIM 2008, RRIM 2014 and RRIM 3001, respectively and there was a relationship between pL with A, gs and E explain by a polynomial function in all clones. Exposure of five Hevea clones to water stress treatment led to lower chlorophyll a, chlorophyll b and total chlorophyll content. Significant reductions in this variables for stressed Hevea were observed in comparison to the control. These reduction after 28th days of stressed were 59%, 60%, 69%, 64% and 59% in RRIM 929, RRIM 2002, RRIM 2008, RRIM 2014 and RRIM 3001, respectively for chlorophyll a. The reduction showed the same trend on chlorophyll b and total chlorophyll content. The pL, A, gs and E values observed under stressed conditions were lower than the control value in all five clones which could be due to clonal differences, especially in the pL finding. pL in RRIM 929 and RRIM 3001 response to a slight decline, compare to RRIM 2014 showed a rapid decline starting on the fourteen day of water stress. However, relationship between pL and gs showed RRIM 2002, RRIM 2008 and RRIM 3001 with a moderate decline indicates a water conservation (dehydration postponement) mechanism employed by the clones which help them to maintain the plant water status during water stress. On the other hand, slow stomata response under water stress in RRIM 2002, RRIM 2008 and RRIM 3001 suggest the low contribution of stomatal closure to drought avoidance of the clones compare to the other 2 clones studied. The trigger for stomatal closure under period of water stress is believed to be associated with root to shoot communication via, abscisic acid (ABA) translocation in many crop (Davies et. al., 1990; Davies and Zhang, 1991; Blum and Johnson, 1993). Furthermore, high WUE had shown RRIM 3001, RRIM 2002 and RRIM 929 were significantly high compare to RRIM 2008 and RRIM 2014 is mainly result of reduced transpiration rate by reduce the stomata opening with low but positive net hotosynthesis acitivity during water stress period. However, the maintenance of low level of A at very low pL in RRIM 2002, RRIM 2008 and RRIM 929 during two whorls harden leaves development may be critical in providing the energy required to maintain translocation of assimilates from the source (root) to the developing sink, the leaves (Lepord et. al., 1998). The decrease in chlorophyll at decreasing leaf water potentials can be attributed to the sensitivity of this pigment to increasing environmental stresses, especially to water stress and salinity, which has been reported by several researchers (Moran et. Al., 1994; Younis et. al., 2000). Despite the total chlorophyll content in RRIM 2008 and RRIM 2014, these clones showed a greater reduction of this parameter under water stress compare to RRIM 2002, RRIM 3001 and RRIM 929. The data presented showed some distinct differences in the response of the five clones to water stress impose during two whorls harden leaves. Although the clones have similar responses under well watered conditions, they do differ in stomatal regulation and maintenance of plant water status, photosynthesis and transpiration rates under declining soil moisture content during their immature stage. RRIM 3001, RRIM 2002 and RRIM 929 maintain photosynthesis under water deficit by maintaining high plant water status (pL). The response of RRIM 3001, RRIM 2002 and RRIM 929 are similar for most of the parameters measured indicating closer performance of the clones under dry environments. The variations observed in plant water status, gas exchange and chlorophyll content among the clones and the different parameters determined in this study could be used to selection of the clones suit for dry environments.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): chlorophyll content
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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Noorliana Mohd Zan. "Impacts of Water Stress on Gas Exchange, Water Relations and Chlorophyll Content in Five Hevea brasilensis Clones". ไม่ระบุหน่วยงาน. ม.ป.ป.

Noorliana Mohd Zan. "Impacts of Water Stress on Gas Exchange, Water Relations and Chlorophyll Content in Five Hevea brasilensis Clones". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Impacts of Water Stress on Gas Exchange, Water Relations and Chlorophyll Content in Five Hevea brasilensis Clones
Noorliana Mohd Zan
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
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