遮荫和干旱复合处理对黄藤幼苗个体生长及生理特性的影响
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引用本文:李雁冰,范少辉,刘广路,陈本学,徐瑞晶,景 雄,曾宪礼.遮荫和干旱复合处理对黄藤幼苗个体生长及生理特性的影响[J].西北植物学报,2019,39(6):1096~1104
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李雁冰1,2,范少辉1*,刘广路1,陈本学1,徐瑞晶1,景 雄1,曾宪礼1 (1 国际竹藤中心竹藤科学与技术重点实验室北京1001022 周口师范学院河南周口 466001) 
基金项目:海南天然更新棕榈藤种群结构研究(1632016014);
中文摘要:以1年生黄藤(Daemonorops jenkinsiana)实生苗为试验材料,采用盆栽控制试验测定分析遮荫和干旱复合处理下黄藤幼苗的生长状况、叶片光合参数、生物量及生理特征的变化情况,以阐明遮荫和干旱复合处理对其生长和生理的影响规律。结果显示:(1)黄藤的株高、地径和功能叶片数目均随遮荫度上升而增加;植株叶片的生物量、净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)均随遮荫度上升而呈先上升后下降的趋势。(2)黄藤叶片的可溶性蛋白(SP)、脯氨酸(Pro)随着遮荫度的增加而先增加后下降,丙二醛(MDA)含量以及超氧化物歧化酶(SOD)、过氧化物酶(POD)活性则均呈先下降后上升的趋势。(3)中度遮荫时,黄藤的株高、地径、功能叶数目、叶片生物量的积累以及PnTr、WUE、Pro和SP含量均显著升高(P<0.05),SOD活性和MDA含量则显著降低(P<0.05)。(4)干旱胁迫导致黄藤的株高、地径、功能叶片数目、叶片生物量积累、PnTr、WUE显著降低,SOD活性、POD活性、MDA含量和Pro含量均显著升高。研究发现,遮荫和干旱复合作用影响黄藤幼苗的生长和发育。黄藤幼苗能通过调整生长策略、光合策略、代谢策略等使植株逐步适应或耐受胁迫,表现出一定的抗旱性和喜阴性;中度遮荫(遮光20%~30%)能够改善黄藤幼苗的生境,并能缓解干旱胁迫对植株造成的伤害,对其生长有利。
中文关键词:黄藤  干旱胁迫  遮荫  生长  生理特性
 
Effect of Shading and Drought on the Growth and Physiological Response of Daemonorops jenkinsiana
Abstract:We studied the growth,photosynthetic parameters,biomass and physiological characteristics of one year old Daemonorops jenkinsiana seedlings under shading, drought, and shading drought intercross stress in order to clarify the effect of shading and drought stresses on the growth and physio biochemical characteristics of D. jenkinsiana. (1) As the increasing of shading rate, the plant height, ground diameter and numbers of functional leaves also increased, and the biomass, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), water use efficiency (WUE) increased initially, and subsequently decreased. (2) The physiological changes were also measured. The proline and soluble protein contents increased initially, and subsequently decreased as the increasing of shading rate. However, MDA content initially decreased and increased subsequently. Similar changing trend were found in the activities of SOD and POD. (3) The plant height, ground diameter, functional leaf number and biomass, Pn, Tr, WUE, Pro and SP contents increased significantly (P<0.05) and the MDA content and SOD activity decreased significantly (P<0.05) under the shading rate of 20%-30%. (4) The increasing degree of drought stress resulted in the obvious reduce of plant height, ground diameter, leaf number and biomass, Pn, Tr, WUE (P<0.05). On the contrary, the SOD and POD activities enhanced and the MDA and Pro contents increased. It was suggested that both shading and drought had influenced the growth of D. jenkinsiana. However, D. jenkinsiana could adapted certain degree of drought and light intensity by altering the photosynthesis and metabolism, even altering plant phenotype. Moderate shading could improve the growth of D. jenkinsiana, and remitted the disadvantage caused by drought conditions.
keywords:Daemonorops jenkinsiana  drought stress  shading  biomass  physiological property
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