ESTATE CROPS NEWS – Patchouli (Pogostemon cablin Benth) is one of plant that produces patchouli oil call patchouli oil. However, patchouli is susceptible to drought. The effect of global warming which changes rainfall pattern caused droughts in several regions including Indonesia. Therefore, it is important to find patchouli variety which is relatively tolerant to drought.
Tapaktuan, Sidikalang, dan Lhokseumawe are three varieties of patchouli which produce high essential oil (290-375 kg/ha) with high patchouli alcohol content (32–33%). The objective of this research was to evaluate the physiological responses of four varieties/clone of patchouli to drought.
The experiment was conducted at greenhouse at Cimanggu, Bogor from February to July 2012. The research was designed in randomized factorial block design (RBD) with three replications. The first factor was four varieties/clone of patchouli (V) Sidikalang, Lhokseumawe, Tapaktuan, and Bio-4. The second factor was four watering intervals (W) every 1, 3, 6 and 9 days of watering. Parameters evaluated were physiological characteristics, soil moisture content, stomatal conductance, transpiration rate (Tr), leaf water potential, relative water content, and proline content of leaf. The results showed that soil moisture content, stomatal conductivity, transpiration rate and relative water content decreased, while leaf water potential and proline levels increased along with the increase of watering intervals. The highest proline level was at interval of nine days watering treatment on Sidikalang varieties. However, all varieties/clone have not different responses to water deficit. (\Setiawan, Tohari, dan Dja’far Shiddieq)
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