| Comprehensive evaluation of drought resistance of four lavender species |
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| DOI：10.7606/j.issn.1000-7601.2013.06.027 |
| Key Words: lavender drought resistance leaf relative water content (RWC) malondialdehyde (MDA) soluble sugar content (SSC) superoxide dismutase (SOD) catalase (CAT) |
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| Abstract: |
| By investigating the change of five drought resistant indexes, including leaf relative water content (RWC), malondialdehyde (MDA), soluble sugar content (SSC), and activity of superoxide dismutase (SOD) and catalase (CAT) under light, moderate and severe drought stress for 0, 10, 20, 30 d and 40 d using the negative pressure water supplying and controlling device to control soil volumetric moisture content, the drought resistance of four lavender species was evaluated comprehensively. The results showed that, with the increase of drought stress intensity, the RWC of the four lavender species tended to decline, and the RWC under light drought stress was significantly higher than that under moderate and severe drought stress after 40 days (P<0.05). The RWC of Lavandula angustifolia cv. Munstead was only 39.02%, but that of L. angustifolia cv. Provence Blue was up to 56.56%, which was the highest among the four species. The contents of MDA and SSC in the four species were significantly increased with the intensification of drought stress. The MDA in
L. angustifolia cv. Provence Blue was increased by 118.67%, but the SSC in it was significantly higher than that in the other three species under drought stress for 40d, compared with 0 d (CK). The activities of SOD and CAT in the four species showed an increasing-summit-decreasing trend under drought stress from 0 to 40 d, and the peak values appeared at 20 d. The activities of SOD and CAT in the four species under light drought stress were higher than the ones under moderate and severe drought stress, and those in L. angustifolia cv. Munstead were the lowest at 20 d. The values of the above five indexes (RWC, MDA, SSC, SOD and CAT) were analyzed comprehensively using the subordinate function method, and it was indicated that the drought resistance of the four lavender
species was sequenced as: L. vera＞L. angustifolia cv. Provence Blue＞L. stoechas cv. Pedunculata＞L. angustifolia cv. Munstead. |
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