Transport Protein CAXs and HMAs Related to Cadmium Absorbing and Transferring of Plant: A Review

doi:10.11924/j.issn.1000-6850.casb20191100806

Abstract

Abstract:

To explore the molecular mechanism of cadmium tolerance of plant and provide a theoretical basis for plant protein transporting heavy metals, this article summarizes the structure and function of transport protein CAXs (cation/H⁺ exchangers) and HMAs (Heavy metal ATPase), and their effects on plant growth, as well as the detoxification mechanism of heavy metals under synergy. CAXs play an important role in improving phytoremediation potential and strengthening plant nutrition, which is mainly related to plants transport divalent cations into the membrane, also determine the concentration of Ca²⁺ in plants, and participate in transportation and detoxicification of heavy metal ions. The operation of CAXs is related to the electrochemical H⁺ gradient generated by plasma membrane and vacuolar membrane of HMAs across the plasma membrane of the cell, which provides essential energy support for CAXs transportation. However, the synergistic mechanism of CAXs and HMAs needs further research. It is suggested that the study of CAXs and HMAs activities and the interrelationship between CAXs and HMAs could provide a basis for future plant genetic engineering for remediation heavy metal pollution soil.

Key words: cadmium, transport protein, CAX, HMA, synergy

CLC Number:

S181

Liu Mei, Li Zuran, Zu Yanqun. Transport Protein CAXs and HMAs Related to Cadmium Absorbing and Transferring of Plant: A Review[J]. Chinese Agricultural Science Bulletin, 2020, 36(30): 82-90.

Figures/Tables 3

References 77

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