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- W2389038082 abstract "Methyl Jasmonate(MeJA) is an important physiological substance which naturally occurs in higher plants.They are also involved in increased plant resistance to various environmental stresses,including abiotic stress such as mechanically damage,low temperature,drought,salinity etc.,and biotic stress such as pathogen and insect damage.This study was conducted to determine the effects of methyl jasmonate(MeJA) on photosynthetic characteristics,antioxidant enzyme activity and osmolytes in seedlings of flue-cured tobacco grown in pots during the transplantation stage under drought stress and post-drought rehydration,using a flue-cured tobacco variety of Heilongjiang province Longjiang 911 as experimental material to discuss the physiological functions of methyl jasmonate to improve plant drought-resistance.There were four treatments including CK(water),0.2 mmol/L,0.5 mmol/L,1.0 mmol/L MeJA to spray on seedlings of flue-cured tobacco at transplanting stage under drought and subsequent 10 days rehydration.The results showed that the photosynthetic rate(Pn),stomatal conductance(Gs) and transpiration rate(Tr) in leaves of flue-curing tobacco were reduced,and intercellular CO_2 concentration(Ci) was first decreased and then increased under drought stress.Malondialdehyde(MDA),soluble sugar contents,SOD and POD activities in leaves of flue-cured tobacco were increased significantly under drought stress.Pn,Gs,Tr,soluble sugar content,SOD,POD activities in seedlings of flue-curd tobacco treated by spraying 0.2 mmol/L and 0.5 mmol/L exogenous MeJA were all higher than CK under water stress,Ci and MDA were decreased,but 1.0 mmol/L MeJA was no significant difference compared with CK.Physiological and biochemical indexes in seedlings of flue-cured tobacco treated with MeJA during post-drought rehydration.recovered more significantly than that of without MeJA.This indicated that MeJA protected the flue-cured tobacco photosynthetic apparatus from injury during drought,alleviated down regulation of photosynthesis,maintained cell membrane stability,increased osmolytes and antioxidant enzyme activity in seedlings of flue-cured tobacco.At same time,there were concentration effects of MeJA on seedlings of flue-cured tobacco during drought,but concentration effects lose during post-drought rehydration.It concluded that MeJA at 0.5 mmol/L,1.0 mmol/L MeJA to spray on seedlings of flue-cured tobacco at transplanting stage could improve plant drought-resistance." @default.
- W2389038082 created "2016-06-24" @default.
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- W2389038082 date "2011-01-01" @default.
- W2389038082 modified "2023-09-24" @default.
- W2389038082 title "Effects of methyl jasmonate on photosynthetic characteristics and antioxidant enzyme of flue-curing tobacco seedlings under drought stress and rehydration" @default.
- W2389038082 hasPublicationYear "2011" @default.
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