摘要
以‘东方不败’、‘常绿’和‘C069’3种萱草(Hemerocallissp.)为材料,研究了不同浓度的外源脱落酸(ABA)和过氧化氢(H2O2)对植物抗旱性的影响。结果表明,ABA和H2O2对3个萱草品种的抗旱性呈现明显的剂量效应,当浓度适宜时能提高其抗旱性。干旱条件下喷施200μmol.L-1ABA,‘东方不败’和‘C069’比其它处理保持了更高的叶片RWC和气孔密度以及更低的叶片相对电导率和气孔开度。可见,200μmol.L-1ABA和H2O2对提高‘东方不败’和‘C069’抗旱性的效果最为明显;而500μmol.L-1ABA和H2O2处理显著地提高‘常绿’的抗旱性。初步推断,ABA和H2O2均可能包含在萱草抗旱的信号途径中,但是两者的信号功能及其关系有待进一步研究。
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 ＇Dongfangbubai＇ 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,＇Changlv＇ gained the best drought resistance at 500 μmol·L-1 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.
出处
《干旱地区农业研究》
CSCD
北大核心
2013年第3期173-177,共5页
Agricultural Research in the Arid Areas
基金
国家自然基金(31160398)
中国博士后科学基金项目(2012T50828
20100470887)
教育部科学技术研究重点项目(211182)
甘肃省自然科学基金项目(1010RJZA211)
