[1]郑俊明,吕志强,孙志鸿*. 重度干旱对3种桑树生物量及其生理生化影响的机理探索[J].西北林学院学报,2018,33(4):44-51.[doi:10.3969/j.issn.1001-7461.2018.04.07]
 ZHENG Jun-ming,LV Zhi-qiang,SUN Zhi-hong*. Severe Drought Stress Mechanism of Biomass and Physiological-biochemical Characteristics in Three Varieties of Morus L.[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2018,33(4):44-51.[doi:10.3969/j.issn.1001-7461.2018.04.07]
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 重度干旱对3种桑树生物量及其生理生化影响的机理探索()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第33卷
期数:
2018年第4期
页码:
44-51
栏目:
出版日期:
2018-07-31

文章信息/Info

Title:
 Severe Drought Stress Mechanism of Biomass and Physiological-biochemical Characteristics in Three Varieties of Morus L.
文章编号:
1001-7461(2018)04-0044-08
作者:
 郑俊明1吕志强2孙志鸿1*
 (1.浙江农林大学 林业与生物技术学院,浙江 临安 311300;2.浙江省农科院 蚕桑研究所,浙江 杭州 310021)
Author(s):
 ZHENG Jun-ming1LV Zhi-qiang2SUN Zhi-hong1*
 (1.School of Forestry and Biotechnology,Zhejiang Agriculture and Forestry University,Lin’an,Zhejiang 311300,China; 2.Sericultural Research Institute,Zhejiang Academy of Agriculture Sciences,Hangzhou,Zhejiang 310021,China)
关键词:
 桑树重度干旱保护酶气体交换生物量
Keywords:
Morus L. severe drought stress protective enzyme leaf gas exchange biomass
分类号:
S718.43
DOI:
10.3969/j.issn.1001-7461.2018.04.07
文献标志码:
A
摘要:
 为探究桑(Morus alba)树在重度干旱下的生理生化响应和适应能力,以农桑14号、农桑12号和强桑1号1年生盆栽苗为试验材料,采用盆栽称重控水的试验方法,控制30% 田间持水量处理30 d,模拟重度干旱对3种桑树生长、气体交换和保护酶含量的影响。结果表明:1)重度干旱导致3种桑树苗的净光合速率(Pn)、胞间二氧化碳浓度(Ci)、气孔导度(Gs)、蒸腾速率(Tr)均有显著下降,水分利用效率(WUE)、气孔限制值(Ls)均有显著上升。干旱胁迫导致3种桑树高生长速率显著降低。农桑14号和农桑12号的根干重(RDM)、茎干重(SDM)、叶干重(LDM)、总干物质量(TDM)均显著降低,而强桑1号对照与处理组之间无显著差异。农桑14号的超氧化物歧化酶(SOD)显著下降,过氧化物酶(POD)活性显著上升,强桑1号的丙二醛(MDA)含量显著上升。2)气孔关闭显著限制了3种桑树的净光合速率,而农桑14号和农桑12号同时存在非气孔因素的限制。3)农桑14号和农桑12号通过有效的形态调节(基部脱叶)和较强的气孔调节来适应极端干旱的环境,其水分利用方式更适合在湿润地区种植;强桑1号严格控制着各部分生物量的分配,相比于农桑14号和农桑12号,强桑1号更适合在干旱地区种植。
Abstract:
 One-year-old potted seedlings of three mulberry varieties of Nongsang No.14,Nongsang No.12 and Qiangsang No.1 were investigated to estimate the effects of severe drought stress on plants,growth,leaf gas exchange and protective enzyme activity,to explore adaptive mechanisms of Morus L.to water stress.The soil moisture was controlled by weighting the pots.The pots relative soil water content came to the 30% of maximum field capacity of soil and kep one-month treatment.The results showed that 1) the drought treatment significantly decreased net photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (Tr) and intercellular CO2 concentration (Ci),however it improved water-use efficiency (WUE) and increased limiting value of stomata (Ls).The severe drought stress decreased the relative height growth rate (RHG) for all three varieties.Moreover,the root dry mass (RDM),steam dry mass (SDM),leaf dry mass (LDM) and total dry mass (TDM) of Nongsang No.14 and Nongsang No.12 had a significant decline,however the decline was not found on Qiangsang No.1.The SOD activity of Nongsang No.14 decreased,while the POD activity of Nongsang No.14 increased.Heavy drought led to a significant higher MDA content in Qiangsang No.1.2) The stomatal limitation decreased the Pn significantly in three varieties of potted Morus L.seedlings,meanwhile the non-stomatal limitation also existed in Nongsang No.14 and Qiangsang No.1.3) Nongsang No.14 and Nongsang No.12 responded to heavy drought stress by efficient morphological adjustment combined with strong stomatal conductance to control water use efficiency under the severe drought stress,and this water-using strategy maybe more suitable for cultivating in humid regions.While Qiangsang No.1 water-using strategies were to control the biomass allocation,especially control above ground biomass,compared to Nongsang No.14 and Nongsang No.12,it maybe more suitable for cultivating in arid regions.

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备注/Memo

备注/Memo:
 收稿日期:2017-10-31修回日期:2017-12-23
基金项目:浙江农林大学科研发展基金项目(2014FR087);浙江省科技计划项目(2016C32018);浙江省农业新品种选育重大科技专项(2016C02054-17)。
作者简介:郑俊明,男,在读硕士,研究方向:植物逆境生理。E-mail:2390356532@qq.com
*通信作者:孙志鸿,女,教授,研究方向:BVOCs合成与调控。E-mail:sunzh656@163.com
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