不同水分胁迫对剑麻生理特性的影响

Effects of Different Water Stress on Physiological Characteristics of Agave sisalana

[目的]研究不同水分胁迫对剑麻生理特性的影响。[方法]通过盆栽试验,研究了轻度(T_1)、重度(T_2)水分胁迫处理对剑麻幼苗生长和抗旱性的影响。[结果]各个时期剑麻株高、植株鲜重、叶片含水量、根系活力从大到小均依次为CK、T_1、T_2,相对电导率(REC)、过氧化物酶(POD)活性、游离脯氨酸(Pro)含量、丙二醛(MDA)含量从低到高依次为CK、T_1、T_2,N、P、K含量均随着水分胁迫的加剧呈下降趋势。随着处理时间的延长,不同处理剑麻叶片含水量均呈上升趋势;CK和T_1处理REC和POD活性均呈先增后减的趋势,T_2处理则呈增加趋势;T_1、T_2处理MDA含量呈增加趋势;各处理N含量均呈先增后减的趋势,P含量逐渐降低;CK和T_1处理K含量逐渐增加,而T_2处理则逐渐降低。[结论]研究结果可为剑麻的抗旱栽培提供理论参考。

[Objective]To study the effects of different water stress on the physiological characteristics of Agave sisalana.[Method]Pot experiment was used to study the effects of mild water stress （T1） and severe water stress （T2） on the growth and drought resistance of A.sisalana seedlings.[Result]The plant height,fresh weight,leaf water content and root vigor changed regularly by the order as CK〉T1〉T2 during the whole growing period.The relative electric conductivity（REC）,POD activity ,free proline （Pro） content and malondialdehyde （MDA） content changed by the order as CK〈T1〈T2.The contents of N,P,K showed declining trends with the increasing of water stress.Along with prolonging of water stress time,the leaf water content showed an increasing trend under different treatments.REC and POD activity increased at first and then decreased in control （CK） and T1 treatments,and increased in T2 treatment.The content of MDA increased in T1 and T2 treatments.The content of N increased at first and then decreased in different treatments.The content of P decreased in different treatments.The content of K gradually increased in CK and T1 treatments,K content in T2 treatment gradually decreased.[Conclusion]The research results can provide theoretical basis for the drought-resistant cultivation of A.sisalana.