Potential of chlorophyll fluorescence as an indicator for assessment of water stress in sunflower growth in hydroponic culture
2011
Simantara, P., Kasetsart Univ., Kamphaeng Saen Campus (Thailand). Dept. of Farm Mechanics | Kumyod, N. | Kongsamai, B., Kasetsart Univ., Kampaeng Saen Campus (Thailand). Dept. of Agronomy
The objective of the study was to identify indicators related to water stress through chlorophyll fluorescence in sunflower which grown in nutrient solution using hydroponic system under greenhouse condition. Plug transplants of two commercial sunflower cultivars, Pacific 55 and Opera, were grown in 25 L_rectangular plastic tray container supplied with 10 l of 0.5 X of the full strength 'Enshi' nutrient solution. Water stress was investigated using polyethylene glycol, PEG _ 6000, with 6 concentrations, 0, 5, 10, 15, 20 and 30%. The split plot experimentation in RCBD [randomized complete block design] with three replication design was conducted. Result showed that PEG concentration at 15% was critical for water stress tolerance in sunflower. Drought stress of sunflower can be identified by chlorophyll fluorescence parameters (Fv/Fm, qNp), chlorophyll content (SPAD value) can cell integrity (% electrical conductivity).
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