乙烯利对干旱胁迫下草地早熟禾生理指标的影响

以草地早熟禾(Poa pratensis)‘Nuglade'品种为试验材料,研究叶片喷施乙烯利对草地早熟禾在水分充足、干旱及复水恢复3种处理下叶片电解质渗透率、叶绿素、可溶性蛋白、丙二醛(MDA)等生理指标的影响。结果表明,乙烯利与对照组(CK)相比,乙烯利在干旱胁迫下保持更高的叶片相对含水量23.5%(对照为11.5%)和更低的电解质渗透率68.1%(对照为90.7%)及MDA含量53.90μmol·g~(-1)(对照检查131.62μmol·g~(-1)),且复水后的电解质渗透率恢复程度更好;此外乙烯利处理提高了复水恢复过程草地早熟禾的可溶性蛋白含量;说明,叶片喷施乙烯利能够缓解草地早熟禾的干旱胁迫损伤,并促进干旱后的复水恢复。

Effect of ethephon on physiological indexes of Kentucky bluegrass under drought stress

Kentucky bluegrass cultivar"Nuglade"plants were divided into two groups-ethephon treated (ETH) and non-ethephon treated control group (CK).These groups of plants were subj ected to three treatment condi-tions:well-watered,drought,and re-watering.The effects of ethephon on the drought responses of Kentucky bluegrass were studied by measuring physiological indicators such as electrolyte leakage and chlorophyll,solu-ble protein,and malondialdehyde (MDA)content.Under drought stress,'Nuglade'treated with ethephon was able to maintain a higher leaf relative water content of 23.47% (with that of the control group being 11.5%) and lower membrane stability expressed as EL 68.1% (with that of the control group being 90.7%).During re-watering,the EL of the ethephon group recovered to that of unstressed plants.Under drought stress,the MDA content in ETH plants was lower than that in the control group.The SP content of the ETH group was also higher than that in the CK group under re-watering conditions;Our results indicated that spraying ethephon on the leaves of Kentucky bluegrass could improve performance and promote the recovery of physiological indexes during re-watering.