Growth and Development of Lateral Root Regulated by Plant Hormone ABA

doi:10.11924/j.issn.1000-6850.casb16030058

Abstract

Abstract: The lateral root (LR) architecture directly affects plant root morphogenesis, which is an important component of plant root system, and plays a critical role in plant resistance?reaction. In order to study the molecular mechanisms of plant hormone abscisic acid (ABA) regulation of LR growth and development, this article summarized the signal transduction of ABA in LR development, revealed the dual roles of ABA in lateral root initiation and the suppression of ABA on LR meristem. This article also analyzed the cross talk between ABA and other regulation factors involved in LR development process, including reactive oxygen species (ROS), auxin, cytokinin, carbon and nitrogen signals, and salt stress, pointing out that ABA inhibited the growth and development of LR through inducing ROS production, antagonism with auxin and co-operation with cytokinin. ABA also participated in the regulation of LR development by complicated carbon and nitrogen signals. In addition, ABA signal mediated the inhibition of LR initiation development during salt stress. Revealing the molecular mechanisms of ABA regulating LR growth and development could provide guidance for improving the plant root characteristics and increasing the stress resistance of crops. However, considering the unclear mechanisms of ABA in root growth regulation and the complexity of root system formation, more efforts are needed.

Dong Huan,Bai Ling and Song Chunpeng. Growth and Development of Lateral Root Regulated by Plant Hormone ABA[J]. Chinese Agricultural Science Bulletin, 2016, 32(18): 76-82.

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