Studies in the Responses of Wheat Root Traits to Drought Stress

doi:10.11983/CBB19089

Abstract

Abstract: Drought stress induces the response of wheat roots, which simultaneously send signals to the aboveground parts stimulating physiological reactions in the aboveground parts, and thus improving drought tolerance of plants. Root architecture traits include morphological traits and three-dimensional geometric structures (i.e, topological structures). The root system architecture not only has genetic stability, but also shows plasticity. The root physiological and biochemical responses to drought stress primarily involve in induced production and changes of root-sourced chemical signals, root cell enzymes, and root osmosis. Under drought stress, plants also alter root anatomical traits and water-uptake kinetics. In this paper, current advances in the studies on root responses to drought stress of wheat (Triticum aestivum) were reviewed with a focus on root system architecture traits, root physiological properties and root anatomical characteristics. The relationship between wheat root properties and drought stress, and the current research constrains were discussed. This review would provide a guidance for future studies on wheat root traits in response to drought stress.

Key words: wheat, root architecture traits, root physiological-biochemical traits, root anatomical traits

Qingxia Miao,Yan Fang,Yinglong Chen. Studies in the Responses of Wheat Root Traits to Drought Stress[J]. Chinese Bulletin of Botany, 2019, 54(5): 652-661.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB19089

https://www.chinbullbotany.com/EN/Y2019/V54/I5/652

Figures/Tables 5

References 101

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根系构型指标	干旱胁迫下的响应	原因	参考文献
二维
根长	轻度干旱下增加, 重度干旱下减少	轻度干旱下根系伸长利用深层水, 重度干旱下根系生长受到抑制	Barraclough et al., 1989; Siopongco et al., 2005
根数	减少	受到干旱胁迫抑制	马富举等, 2012; Vandoorne et al., 2012
根系表面积	减少	受到干旱胁迫抑制	马富举等, 2012; Vandoorne et al., 2012
根系生物量	轻度干旱下增加, 重度干旱下减少	轻度干旱下增加有利于维持根系吸水能力	Kano et al., 2011; 马富举等, 2012
根长密度	表层减少, 深层增加	增加对深层储蓄水的利用	Barraclough et al., 1989; Uga et al., 2011; Wasson et al., 2012; Becker et al., 2016; Fang et al., 2017
根毛	增加	增加根系与土壤接触面积, 减少水分吸收阻力	Passioura, 1991; Segal et al., 2008; White and Kirkegaard, 2010
三维
根系拓扑构型	由叉状向鱼尾形发展	鱼尾形结构根系下扎较深, 分支结构可有效利用水分	谈峰等, 2011; 单立山等, 2012

根系构型指标	干旱胁迫下的响应	原因	参考文献
二维
根长	轻度干旱下增加, 重度干旱下减少	轻度干旱下根系伸长利用深层水, 重度干旱下根系生长受到抑制	Barraclough et al., 1989; Siopongco et al., 2005
根数	减少	受到干旱胁迫抑制	马富举等, 2012; Vandoorne et al., 2012
根系表面积	减少	受到干旱胁迫抑制	马富举等, 2012; Vandoorne et al., 2012
根系生物量	轻度干旱下增加, 重度干旱下减少	轻度干旱下增加有利于维持根系吸水能力	Kano et al., 2011; 马富举等, 2012
根长密度	表层减少, 深层增加	增加对深层储蓄水的利用	Barraclough et al., 1989; Uga et al., 2011; Wasson et al., 2012; Becker et al., 2016; Fang et al., 2017
根毛	增加	增加根系与土壤接触面积, 减少水分吸收阻力	Passioura, 1991; Segal et al., 2008; White and Kirkegaard, 2010
三维
根系拓扑构型	由叉状向鱼尾形发展	鱼尾形结构根系下扎较深, 分支结构可有效利用水分	谈峰等, 2011; 单立山等, 2012

根源化学信号	干旱胁迫下响应	参考文献
脱落酸	干旱条件下增加, 传递根源信号和控制气孔导度, 减弱蒸腾作用	Tardieu et al., 1992; Saradadevi et al., 2015; 马超等, 2017; 谢静静等, 2018
生长素	干旱条件下降低, IAA/ CTK降低, 与脱落酸呈拮抗作用	Eckert and Kaldenh- off, 2000; Xu et al., 2013; Han et al., 2015
细胞分裂素(玉米素, 玉米素核苷)	干旱条件下降低, 与生长素呈拮抗作用	Dodd, 2003; Kudoyarova et al., 2007; Han et al., 2015
木质部pH值	干旱条件下增加, 与脱落酸共同作用引起气孔关闭	Gollan et al., 1992
钙离子	干旱胁迫下脱落酸诱导气孔关闭过程中的第二信使	Parcy and Giraudat, 1997; Snedden and Fromm, 2001; Bothwell and Ng, 2005; Case et al., 2007

根源化学信号	干旱胁迫下响应	参考文献
脱落酸	干旱条件下增加, 传递根源信号和控制气孔导度, 减弱蒸腾作用	Tardieu et al., 1992; Saradadevi et al., 2015; 马超等, 2017; 谢静静等, 2018
生长素	干旱条件下降低, IAA/ CTK降低, 与脱落酸呈拮抗作用	Eckert and Kaldenh- off, 2000; Xu et al., 2013; Han et al., 2015
细胞分裂素(玉米素, 玉米素核苷)	干旱条件下降低, 与生长素呈拮抗作用	Dodd, 2003; Kudoyarova et al., 2007; Han et al., 2015
木质部pH值	干旱条件下增加, 与脱落酸共同作用引起气孔关闭	Gollan et al., 1992
钙离子	干旱胁迫下脱落酸诱导气孔关闭过程中的第二信使	Parcy and Giraudat, 1997; Snedden and Fromm, 2001; Bothwell and Ng, 2005; Case et al., 2007

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