摘要
为了探究外源ABA提高甘薯苗期抗旱性的生理机制,筛选出最佳施用浓度,以抗旱品种济薯21和不抗旱品种济紫薯1号为试验材料,研究水分胁迫条件下外源ABA对甘薯幼苗生理特性的影响。结果表明,水分胁迫后济薯21和济紫薯1号的叶片相对含水量、叶绿素含量以及根系活力均低于清水对照,而叶片相对电导率、叶片和根的MDA含量均高于清水对照;济薯21的叶片相对电导率、叶片和根的MDA含量显著低于济紫薯1号,而根系活力和叶绿素含量显著高于济紫薯1号。水分胁迫条件下,外源ABA处理两品种的叶片相对含水量、叶绿素含量以及根系活力均显著高于对照,而叶片相对电导率、叶片和根的MDA含量显著低于对照;不同浓度的外源ABA均可显著提高甘薯的抗旱性,以150μmol/L处理的效果最显著。因此认为,外源ABA降低叶片相对电导率和MDA的积累,可以缓解干旱胁迫对膜的损伤,提高叶片相对含水量及叶绿素含量,提高根系活力从而增强根系吸收能力。
To explore the physiological mechanisms of exogenous ABA to improve drought resistance of sweet potato at seedling stage and to screen out the best application concentrations,the effects of exogenous ABA on physiological characteristics of sweet potato seedlings were studied under drought stress conditions with drought-resistant variety Jishu 21 and drought-sensitive variety Ji Zishu 1 as experimental materials.As a result,the relative water content and chlorophyll content of leaves and the root activity of Jishu21 and Ji Zishu 1 were lower than those of control group under drought stress,but the relative conductivity and MDA content of leaves and roots were higher.The leaf relative conductivity,leaf and root MDA contents of drought-resistant variety Jishu 21 were significantly lower than those of non-resistant variety Ji Zishu 1,while root activity and chlorophyll content were significantly higher.Under drought stress,exogenous ABA treatment significantly increased the relative water content and chlorophyll content of leaves and the root activity compared with control,while significantly decreased the leaf relative conductivity,leaf and root MDA contents.Different concentrations of exogenous ABA could significantly improve the drought resistance of sweet potato,and 150μmol/L of exogenous ABA had the most significant effect.It was concluded that exogenous ABA reduced the relative conductivity and MDA accumulation of leaves to alleviate the damage of drought stress to membrane,increase the relative water content and chlorophyll content of leaves,and improve the root activity to enhance the root absorption ability.
作者
李浩
解备涛
冯向阳
汪宝卿
董顺旭
段文学
张海燕
张立明
Li Hao;Xie Beitao;Feng Xiangyang;Wang Baoqing;Dong Shunxu;Duan Wenxue;Zhang Haiyan;Zhang Liming(Qingdao Agricultural University,Qingdao 266109,China;Crop Research Institute,Shandong Academy of Agricultural Sciences/Scientific Observation and Experimental Station of Tubers and Root Crops in the Huanghe-Huaihe-Haihe Region,Ministry of Agriculture and Rural Affairs/Shandong Engineering Laboratory of Featured Crops,Jinan 250100,China;Changle Bureau of Agriculture and Rural Affairs,Changle 262400,China;Shandong Academy of Agricultural Sciences,Jinan 250100,China)
出处
《山东农业科学》
北大核心
2021年第1期32-37,共6页
Shandong Agricultural Sciences
基金
国家现代农业产业技术体系建设专项(CARS-10-B08)
山东省薯类产业创新团队项目(SDAIT-16-09)
山东省农业科学院农业科技创新工程项目(CXGC2016A05)
山东省农业重大应用技术创新项目(SD2019ZZ022)。
关键词
ABA
水分胁迫
甘薯
幼苗
生理特性
ABA
Water stress
Sweet potato
Seedling
Physiological characteristics
