摘要
以紫薇优良新品种‘丹红紫叶’二年生苗为试材,采用套盆淹水方法,设计了5个淹水持续时间处理,研究不同淹水胁迫处理对紫薇苗生长及生理指标的影响,以期为紫薇苗培育及园林应用的水分管理提供参考依据。结果表明:紫薇能承受14 d的淹水,淹水21 d是紫薇忍受淹水胁迫持续时间的极限。随着淹水胁迫时间增长,紫薇苗的叶片相对含水量、过氧化物酶活性、超氧化物歧化酶活性、可溶性蛋白质含量、净光合作用速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、胞间CO_(2)浓度(Ci)均总体呈下降趋势,淹水21 d时分别比对照处理显著下降了24.29%、79.88%、18.66%、3.16%、80.45%、92.51%、93.10%、25.43%,淹水28 d时达到最低值;脯氨酸、丙二醛含量呈上升趋势,淹水21 d时分别比对照显著增加67.34%、360.54%,淹水28 d最大;过氧化氢酶活性呈先升后降的趋势,淹水21 d最大,比对照显著增加252.65%;可溶性糖含量呈先降后升再降的趋势,淹水21 d最大,比对照显著增加19.38%;淹水胁迫期间紫薇苗的叶绿素相对含量变化不明显;水分利用效率(WUE)呈起伏波动走势,对照最低,淹水21 d较高,比对照显著高184.00%。紫薇苗具有一定的耐涝性,淹水胁迫持续时间不宜超过14 d。
The two-year-old seedlings of Lagerstroemia indica L.‘Ebony Embers',an excellent new variety of Lagerstroemia indica L.,were employed for the research object,five flooding length treatments was set up and the flooding in pots method was used to ascertain the effects of various flooding stress treatments on the growth and physiological indexes of Lagerstroemia indica L.seedlings,in order to provide reference for water management in the culture of Lagerstroemia indica L.seedlings and garden application.The results showed that Lagerstroemia indica L.could tolerate up to 14 days of flooding,with 21 days representing the maximum amount of flooding stress that the species could withstand.As the duration of flooding stress increased,the relative water content,peroxidase activity,superoxide dismutase activity,soluble protein content,net photosynthesis rate(Pn),stomatal conductance(Gs),transpiration rate(Tr),and inter-cellular CO_(2) concentration(Ci)of Lagerstroemia indica L.seedlings showed a decreasing trend.At 21 days of flooding,these values were significantly lower than those of the control falling by 24.29%,79.88%,18.66%,3.16%,80.45%,92.51%,93.10%,and 25.43%,respectively.They reached their lowest value at 28 days of flooding.Proline content and malondialdehyde content showed an upward trend,and increased significantly by 67.34%and 360.54%,respectively,compared with the control at 21 days of inundation,and reached the maximum at 28 days of inundation.Catalase activity showed a trend of increasing and then decreasing,and reached the maximum at 21 days,and increased significantly 252.65%over the control compared with the control.Soluble sugar content showed a trend of decreasing and then increasing and then decreasing,with the flooding 21 days being the largest,a significant increase of 19.38%over the control.The relative chlorophyll content of Lagerstroemia indica L.seedlings during the period of flooding stress did not change significantly.Water use efficiency(WUE)showed an undulating and fluctuating trend,with th
作者
王湘莹
魏溧姣
王晓明
唐丽
乔中全
潘子曦
WANG Xiangying;WEI Lijiao;WANG Xiaoming;TANG Li;QIAO Zhongquan;PAN Zixi(Forestry and Grassland Breeding Institute,Hunan Academy of Forestry,Changsha,Hunan 410004;College of Forestry,Central South University of Forestry&Technology,Changsha,Hunan 41o004;Hunan Modern Logistics College,Changsha,Hunan 410131)
出处
《北方园艺》
CAS
北大核心
2024年第15期60-66,共7页
Northern Horticulture
基金
国家重点研发计划资助项目(2020YFD100500)
湖南省花卉苗木产业发展资助项目(HH202201)。
关键词
紫薇
淹水胁迫
生长
生理
Lagerstroemia indica L.
flooding stress
growth
physiology
