| Effects of paclobutrazol and PVA on drought resistance of perennial ryegrass seedlings under light drought stress |
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| DOI：10.7606/j.issn.1000-7601.2007.05.31 |
| Key Words: paclobutrazol PVA perennial ryegrass drought resistance |
| Author Name | Affiliation | | GAO Jing-hui | College of Animal Science and Technology Northwest A＆F University,Yangling,Shaanxi 712100,China | | ZHANG Ying | College of Animal Science and Technology Northwest A＆F University,Yangling,Shaanxi 712100,China | | GUO Wei | College of Animal Science and Technology Northwest A＆F University,Yangling,Shaanxi 712100,China | | GAO Chun-qi | College of Animal Science and Technology Northwest A＆F University,Yangling,Shaanxi 712100,China |
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| Abstract: |
| Under light drought stress, paclobutrazol (PP333) of different concentrations (150 mg/m2, 300 mg/m2, 450 mg/m2) were sprayed on leaves of Lolium perenne L.cv.Pirouette soaked with PVA for twelve hours before planting in order to discuss effects of PP333 and PVA on drought-resistance of perennial ryegrass seedlings.The results showed that seedling percentage and leaf relative water content (RWC) of perennial ryegrass soaked with 2% PVA increased by 0.13-fold and 0.03-fold respectively, and differences were significant at 0.01 level.After the use of 2%PVA+150 mg/m2 PP333, leaf RWC, enzyme activities of SOD, POD and CAT increased by 0.04-fold, 0.40-fold, 0.44-fold and 0.17-fold, respectively, MDA content decreased by 51.58%, plant height decreased by 42.57%, and differences were significant at 0.05 level.And the effect of 2%PVA+150 mg/m2 PP333 on drought resistance of perennial ryegrass was better than 2%PVA and 150 mg/m2 PP333 single.When the concentration of PP333 was increased to 300～450 mg/m2 with pretreatment of 2%PVA, the oxidative damage to leaves sustained the protective enzyme activities decreased.Generally, 2%PVA+150 mg/m2 PP333 can obviously release the effect of drought stress on germination and seedling growth of perennial ryegrass, and had the best effect. |
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