Plant Salt-exclusion Mechanism: A Review

doi:10.11924/j.issn.1000-6850.casb2022-0680

Abstract

Abstract:

This paper aims to provide new ideas for exploring the internal mechanism of plant salt exclusion, screening of salt-exclusion plants and breeding of salt-exclusion crops. The authors review how plants cope with salt stress through salt-exclusion pathways such as tissue structure adaptation, signaling pathway and transporter gene regulation, clarify the key roles of casparian strip of endodermis, suberization of endodermis and exodermis of root, pericycle and xylem parenchyma in plant salt exclusion, and elucidate the species differences in tissue structure in plant salt exclusion. SOS pathway, NHX, HAK and HKT and other transporters play important regulatory roles in the process of plant salt exclusion. SOS pathway, NHX and HAK are ubiquitous in various types of root cells, mainly responsible for Na⁺ exclusion, transport and vacuole compartmentalization; HKT genes are mainly expressed in xylem parenchyma tissues, and it may play role of salt compartmentalization in xylem parenchyma.

Key words: salt-resistant plants, salt exclusion, salt avoidance, pericycle, tissue barriers

LI Xia, LIU Chuanxin, XU Bin, DONG Rongshu, HUAN Hengfu, HUANG Chunqiong, YAN Linling, WANG Wenqiang, YANG Hubiao, YU Daogeng, WANG Zhiyong, LIU Yiming. Plant Salt-exclusion Mechanism: A Review[J]. Chinese Agricultural Science Bulletin, 2023, 39(27): 86-94.

Figures/Tables 2

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