| Effects of exogenous abscisic acid and hydrogen peroxide on drought resistance of 3 Hemerocallis cultivars |
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| DOI：10.7606/j.issn.1000-7601.2013.03.28 |
| Key Words: abscisic acid (ABA) hydrogen peroxide (H2O2) Hemerocallis sp. drought resistance |
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| Abstract: |
| In attempt to study effects of exogenous abscisic acid and hydrogen peroxide on plant drought resistance,
different concentrations of abscisic acid (ABA)and hydrogen peroxide (H2O2)were tested on 3 Hemerocallis cultivars ‘Dongfangbubai’,‘Changlv’ and ‘C069’. The results showed that application of suitable concentrations of ABA and H2O2 obviously alleviated the symptoms of drought stress of Hemerocallis leaves in a dose-dependent manner. Under water stress, 200 μmol·L-1 ABA treatments sustained a much higher leaf water relative content and stomatal density in ‘Dong-fangbubai’and ‘C069’ than other treatments did. At same time, leaf relative electricity conductivity and stomatal relative open of ‘Dongfangbubai’ and ‘C069’ were lower in the 200 μmol·L-1 ABA treatments than in the other treatments. The 200 μmol·L-1 ABA and H2O2 treatment achieved the maximum improvement of drought resistance for ‘Dongfangbubai’and ‘C069’. Meanwhile, ‘Changly’ gained the best drought resistance at 500 μmol·L ABA and H2O2 treatment. Based on results in this paper, we proposed that ABA and H2O2 may be involved in the downstream of drought stress signaling cascades of Hemerocallis. But their roles and relationship in the drought stress signal cascades are not clear and need further investigation. |
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