南京林业大学学报(自然科学版) ›› 2021, Vol. 45 ›› Issue (2): 111-119.doi: 10.12302/j.issn.1000-2006.202002019

• 研究论文 • 上一篇    下一篇

5种造林树种对干旱胁迫的抗性应答

洪震1(), 刘术新2, 洪琮浩3, 雷小华4   

  1. 1.华东药用植物园科研管理中心,浙江 丽水 323000
    2.丽水职业技术学院,浙江 丽水 323000
    3.北京林业大学生物科学与技术学院,北京 100083
    4.丽水市莲都区城区林业工作中心站,浙江 丽水 323000
  • 收稿日期:2020-02-19 接受日期:2020-06-20 出版日期:2021-03-30 发布日期:2021-04-09
  • 基金资助:
    浙江省丽水市重点研发计划项目(2016ZDYF08)

Resistance response of five afforestation tree species under drought stress

HONG Zhen1(), LIU Shuxin2, HONG Conghao3, LEI Xiaohua4   

  1. 1. Scientific Research and Management Center of East China Pharmaceutical Botanical Garden, Lishui 323000, China
    2. Lishui Vocational & Technical College, Lishui 323000, China
    3. College of Biological Sciences and Biotechnology, Beijing 100083, China
    4. Center of Lishui City Liandu District Urban Forestry Working Station, Lishui 323000, China
  • Received:2020-02-19 Accepted:2020-06-20 Online:2021-03-30 Published:2021-04-09

摘要:

【目的】探究不同造林树种的抗旱性,为科学配置乡土树种和外来树种及困难立地造林提供依据。【方法】以5个树种,枫香(Liquidambar formosana)、黄连木(Pistacia chinesis)、长序榆(Ulmus elongata)、黄山栾树(Koelreuteria bipinnata )和娜塔栎(Quercus texana)1年生实生苗为试验材料,通过盆栽试验研究适宜水分、轻度干旱、中度干旱和重度干旱(即土壤含水量分别为田间持水量的75%~80%、55%~60%、40%~45%和30%~35%)条件下的生理响应及抗旱性差异。【结果】①随着干旱程度的增加,5个树种出现不同程度的干旱胁迫症状,主要表现为叶片发黄、萎蔫,严重时枝条顶端出现干枯。胁迫30 d时,重度胁迫下,长序榆和黄山栾树部分幼苗死亡,黄连木整株叶片变黄或变红;枫香和娜塔栎中下部叶片变黄干枯;②5个树种叶绿素总量与叶片相对含水量呈下降的趋势;相对电导率和丙二醛(MDA)含量呈上升的趋势;游离脯氨酸、可溶性糖和可溶性蛋白含量呈增加的趋势;③ 娜塔栎的超氧化物歧化酶(SOD)活性、过氧化物酶(POD)活性和过氧化氢酶(CAT)活性均升高;枫香、黄连木、黄山栾树的SOD、POD和CAT活性均呈现先升高后降低的变化趋势;长序榆的SOD和CAT活性呈现先升高后降低的变化趋势,而POD活性则是随着胁迫程度的增加而升高;④ 隶属函数分析表明,中度和重度胁迫条件下,5个树种抗旱能力由强到弱依次是娜塔栎、枫香、黄连木、长序榆、黄山栾树。【结论】娜塔栎在5个树种中抗旱性最强,可在干旱地区的造林中推广应用。

关键词: 造林树种, 干旱胁迫, 生理响应, 抗旱性评价, 隶属函数法

Abstract:

【Objective】To select species for afforestation in difficult sites by evaluating the drought resistance of five native and alien tree species. 【Methods】Pot experiments were conducted to study the physiological response and drought resistance of 1-year-old seedlings of Liquidambar formosana, Pistacia chinensis, Ulmus elongata, Koelreuteria bipinnata, and Quercus texana under conditions of appropriate humidity and light, moderate, and severe drought (75%-80%, 55%-60%, 40%-45% and 30%-35% of the soil field capacity).【Result】With the increase of drought extent, five species showed different levels of symptoms of drought stress and major symptoms are yellow leaves and wilting. Severely affected branches’ tops dried up with the increasing time of continuing drought. After sereve drought stress for 30 days, partial seedings of U. elongata and K. bipinnata died, whole leaves of P. chinensis turned yellow or red, and leaves in the middle and lower portions of L. formosana and Q. texana turned yellow and dry. The chlorophyll and relative water content in the leaves of the five tree species decreased; the relative conductance and malondialdehyde (MDA) concentration in leaves increased; the content of free proline, soluble sugar and protein in leaves increased. The SOD, POD, and CAT activities in the leaves of Q. texana increased, whereas it increased and then decreased in L. formosana, P. chinensis, and K. bipinnata trees. With the increasing drought extent, the SOD and CAT activities in the leaves of U. elongate increased at first and then decreased, while the activity of POD increased with the increasing drought stress. Membership function analysis showed that under moderate and severe drought stress, drought resistance levels were Q. texana > L. formosana > P. chinensis > U. elongate > K. bipinnata.【Conclusion】Q. texana has the strongest drought resistance among the five tree species, which provides a competitive advantage for afforestation usage in difficult sites.

Key words: afforestation tree species, drought stress, physiological responses, evaluation of drought resistance, subordinate function method

中图分类号: