[1]宋志娟,马正岩,戚建国,等. 干旱胁迫对平邑甜茶不同生长时期氮素吸收利用的影响[J].西北林学院学报,2023,38(3):94-100.[doi:10.3969/j.issn.1001-7461.2023.03.13]
　SONG Zhi-juan,MA Zheng-yan,QI Jian-guo,et al. Effects of Drought Stress on Nitrogen Uptake and Utilization of Malus hupehensis at Different Growth Stages[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2023,38(3):94-100.[doi:10.3969/j.issn.1001-7461.2023.03.13]
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 干旱胁迫对平邑甜茶不同生长时期氮素吸收利用的影响()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第38卷
期数:
2023年第3期
页码:
94-100
栏目:
出版日期:
2023-05-31

文章信息/Info

Title:
 Effects of Drought Stress on Nitrogen Uptake and Utilization of Malus hupehensis at Different Growth Stages
文章编号:
1001-7461(2023)03-0094-07
作者:
 宋志娟; 马正岩; 戚建国; 邹养军; 李明军*
 （西北农林科技大学 园艺学院，陕西 杨陵 712100）
Author(s):
 SONG Zhi-juan; MA Zheng-yan; QI Jian-guo; ZOU Yang-jun; LI Ming-jun*
 (College of Horticulture,Northwest A&F University,Yangling 712100,Shaanxi,China)
关键词:
 ; 苹果砧木; 平邑甜茶; 干旱胁迫; 氮素吸收
Keywords:
 ; apple rootstock;  Malus hupehensis;  drought stress;  nitrogen absorption
分类号:
S718.43
DOI:
10.3969/j.issn.1001-7461.2023.03.13
文献标志码:
A
摘要:
 为研究干旱胁迫对苹果砧木平邑甜茶不同生长时期N素吸收利用效率的影响，以1年生盆栽平邑甜茶为材料，设置干旱胁迫和对照2组处理，其中干旱胁迫是在施肥前对平邑甜茶提前2周控水，保持盆土45%~55%田间最大持水量；对照正常供水，保持盆土75%~85%田间最大持水量。以15N标记的尿素为N源，分别于4月10日、5月10日、7月10日和9月10日4个生长时期施1.0 g 15N标记的尿素，分析干旱胁迫对平邑甜茶4个生长时期的植株N含量、各器官肥料N的百分率(Ndff)、15N分配率、利用率以及N素转运代谢相关基因表达量的影响。结果表明：1）与对照相比，4个生长时期中，干旱胁迫均降低平邑甜茶植株N含量、各器官对N的吸收转运能力以及N素利用率，其中在7月生长期降低的最显著，植株N含量降低27.0%、根、茎、叶的Ndff值分别降低23%、35%、40%、N素利用率降低42%。2）干旱胁迫下平邑甜茶各器官氮素分配由地上部分向地下部分转移，优先供应植株生长中心。3）干旱胁迫下平邑甜茶根系对N素吸收利用能力降低，一是N素转运蛋白基因DUR表达量下调，降低吸收；二是N素同化代谢相关基因NR、GDH2、GS、NADH-GOGAT及Fd-GOGAT表达量下调，引起N同化受到抑制。
Abstract:
 The effects of drought stress on nitrogen absorption and utilization efficiency of Malus hupeheusis (a kind of rootstock of for apple production) at different growth stages were studied.One-year-old potted M.hupeheusis was used as materials.Two treatments of drought stress were set up by controlling the water capacity two weeks in advance before fertilization and maintaining the maximum water capacity of 45%-55% of basin soil.The normal water supply (control) was carried out by maintaining the maximum water capacity of 75%-85% of basin soil.The 15N labeled urea was used as nitrogen source and 1.0 g 15N labeled urea was applied at four growth stages on April 10,May 10,July 10 and September 10,respectively.The effects of drought stress on nitrogen content,Ndff (Nitrogen derived from fertilizer) value of each organ,15N distribution rate,utilization rate and gene expression level of nitrogen transport and metabolism in M.hupeheusis seedlings during four growth stages were analyzed.The main results showed that 1) compared with the control,drought stress reduced the nitrogen content of the plant,N absorption and transport capacity of various organs and N use efficiency decreased in the four growth stages,and the decrease was most significant in July.Nitrogen content of plant decreased by 27.0%,Ndff values of root,stem and leaf decreased by 23%,35% and 40%,respectively,and nitrogen use efficiency decreased by 42%.2) Under drought stress,nitrogen distribution in various organs transferred from aboveground part to underground part,and the plant growth center was preferred.3) Under drought stress,the nitrogen uptake ability of the roots reduced: firstly,the expression level of nitrogen transporter gene DUR was down-regulated,which decreased the absorption; secondly,the expression levels of nitrogen assimilation metabolism-related genes NR,GDH2,GS,NADH-GOGAT and FD-GOGAT were down-regulated,which resulted in inhibition of nitrogen assimilation.

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备注/Memo

备注/Memo:
 收稿日期：2022-04-16修回日期：2022-06-13
基金项目：陕西省重点研发计划（2019TSLNY02-02）。
第一作者：宋志娟。研究方向：果实品质评价。 E-mail：songzhijuan1227@163.com
*通信作者：李明军，博士，博士生导师，教授。研究方向：果实品质生物学。E-mail：limingjun@nwsuaf.edu.cn
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