摘要
为探索板栗的水分胁迫适应机制,本文以2个板栗品种为试验材料,采用盆栽控水法,研究板栗叶片的保水力与耐旱性的关系。结果表明:对照处理下的土壤含水量为26.79%,随着干旱处理时间的增加土壤含水量呈现不断下降的趋势,在干旱胁迫40 d时,土壤含水量达到6.8%;大板红的株高生长量在不同胁迫处理时间均高于燕山早丰,在干旱胁迫处理40 d时,大板红和燕山早丰的株高生长量分别为5.2和4.8 cm;2个板栗品种在进行干旱胁迫处理后的叶片相对含水量在整个叶片失水过程中均小于对照,且两品种的叶片相对含水量随干旱胁迫处理时间的增加而减少,随叶片失水时间的延长两品种的叶片相对含水量均呈下降趋势,在失水24.0 h时,不同处理下的大板红和燕山早丰的叶片相对含水量分别为42.17%~64.04%和32.01%~59.04%;各干旱胁迫处理的叶片失水速率在叶片失水0.5~24.0 h均小于对照,且随着干旱胁迫时间的延长,叶片失水速率减缓,在失水24.0 h时大板红和燕山早丰的失水率分别为35.96%~55.09%和40.96%~63.64%。综上所述,板栗在遇到干旱胁迫时可通过减少叶片含水量,降低叶片的失水速率以减少水分的散失,维持体内水分代谢的相对稳定;离体叶片失水速率可作为鉴定板栗品种抗旱性的生理指标。
In order to explore the adaptation mechanism of chestnut to water stress,two chestnut varieties were used as experimental materials to study the relationship between water holding capacity and drought tolerance of chestnut leaves.The results showed that,the soil water content under the control treatment was 26.79%,with the increase of drought treatment time,the soil water content showed a downward trend,and reached 6.8%after 40 days of drought stress,the plant height growth of Dabanhong was higher than that of Yanshanzaofeng under different stress treatment time,and the plant height growth of Dabanhong was higher than that of Yanshanzaofeng under 40 days of drought stress.The plant height growth of Dabanhong and Yanshanzaofeng were 5.2 and 4.8 cm,respectively.The relative water content of the leaves of the two chestnut varieties after drought stress treatment was lower than that of the control,and the relative water content of the leaves of the two varieties decreased with the increase of drought stress treatment time.The relative water content of leaves of Dabanhong and Yanshanzaofeng was 42.17%-64.04%and 32.01%-59.04%respectively,and the water loss rate of leaves of each drought stress treatment was lower than that of the control at 0.5-24.0 h,and with the extension of drought stress time,the water loss rate of leaves slowed down and decreased at 24.0 h.The water loss rates of Dabanhong and Yanshanzaofeng were 35.96%-55.09%and 40.96%-63.64%respectively.In conclusion,chestnut can reduce water loss by reducing leaf water content and water loss rate under drought stress,and maintain the relative stability of water metabolism in vivo;in vitro leaf water loss rate can be used as a physiological index to identify the drought resistance of chestnut varieties.
作者
赵爽
葛朝红
闵卓
李梦喆
李伟明
ZHAO Shuang;GE Chao-hong;MIN Zhuo;LI Meng-zhe;LI Wei-ming(Cotton Research Institute,Hebei Academy of Agricultural and Forestry Sciences,Shijiazhuang 050051,China)
出处
《黑龙江农业科学》
2021年第2期28-32,共5页
Heilongjiang Agricultural Sciences
基金
河北省高层次人才资助项目(B2019003037)
河北省农林科学院创新工程项目课题(2-06-02)
河北省农林科学院农业科技创新人才队伍建设项目。
