干旱区生态环境知识资源中心(Arid): 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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	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
其他题名	Severe Drought Stress Mechanism of Biomass and Physiological-biochemical Characteristics in Three Varieties of Morus L
	郑俊明; 吕志强; 孙志鸿
来源期刊	西北林学院学报
ISSN	1001-7461
出版年	2018
卷号	33 期号:4 页码:44-51
中文摘要	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30d,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(P_n)、胞间二氧化碳浓度(C_i)、气孔导度(G_s)、蒸腾速率(T_r)均有显著下降,水分利用效率(WUE)、气孔限制值(L_s)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(R_(DM))、茎干重(S_(DM))、叶干重(L_(DM))、总干物质量(T_(DM))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。
英文摘要	One-year-old potted seedlings of three mulberry varieties of Nongsang No.14,Nongsang No.12 and Qiangsang No.1were 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(P_n),stomatal conductance(G_s),transpiration rate(T_r)and intercellular CO_2concentration(C_i),however it improved water-use efficiency(WUE) and increased limiting value of stomata (L_s).The severe drought stress decreased the relative height growth rate(RHG)for all three varieties.Moreover,the root dry mass(R_(DM)),steam dry mass(S_(DM)),leaf dry mass(L_(DM))and total dry mass(T_(DM))of Nongsang No.14and Nongsang No.12had a significant decline, however the decline was not found on Qiangsang No.1.The SOD activity of Nongsang No.14decreased,while the POD activity of Nongsang No.14increased.Heavy drought led to a significant higher MDA content in Qiangsang No.1.2)The stomatal limitation decreased the P_nsignificantly 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.14and Nongsang No.12responded 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.1water-using strategies were to control the biomass allocation,especially control above ground biomass,compared to Nongsang No.14and Nongsang No.12,it maybe more suitable for cultivating in arid regions.
中文关键词	桑树 ; 重度干旱 ; 保护酶 ; 气体交换 ; 生物量
英文关键词	Morus L. severe drought stress protective enzyme leaf gas exchange biomass
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Forestry
WOS研究方向	Forestry
CSCD记录号	CSCD:6280484
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238461
作者单位	郑俊明, 浙江农林大学林业与生物技术学院, 临安, 浙江 311300, 中国.; 孙志鸿, 浙江农林大学林业与生物技术学院, 临安, 浙江 311300, 中国.; 吕志强, 浙江省农科院蚕桑研究所, 杭州, 浙江 310021, 中国.
推荐引用方式 GB/T 7714	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],2018,33(4):44-51.
APA	郑俊明,吕志强,&孙志鸿.(2018).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.西北林学院学报,33(4),44-51.
MLA	郑俊明,et al."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".西北林学院学报 33.4(2018):44-51.