Effect of Auxin on Cadmium Toxicity-Induced Growth Inhibition in Solanum lycopersicum

Author:

Liu Huabin1,Wu Yue1,Cai Jiahui1,Chen Yuting2,Zhou Cheng1,Qiao Cece1,Wang Yuliang1,Wang Song1

Affiliation:

1. College of Life and Health Sciences, Anhui Science and Technology University, Chuzhou 233100, China

2. College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China

Abstract

Auxins play crucial regulatory roles in plants coping with cadmium (Cd) stress. However, the regulatory mechanism by which auxins alleviate Cd toxicity in tomato seedlings remains unclear. Here, we demonstrate that exposure to Cd stress leads to dynamic changes in the auxin response in tomato roots, characterized by an initial increase followed by a subsequent weakening. Under Cd stress, tomato seedlings show primary root- and hypocotyl-growth inhibition, accompanied by the accumulation of Cd and reactive oxygen species (ROS) in the roots. The exogenous application of 1-naphthylacetic acid (NAA) does not mitigate the inhibitory effect of Cd toxicity on primary root growth, but it does significantly enhance lateral root development under Cd stress. Auxin transport inhibitors, such as 1-N-naphthylphthalamic acid (NPA) and 2,3,5-triiodobenoic acid (TIBA), aggravate the growth inhibition of primary roots caused by Cd stress. Additionally, lateral root development was inhibited by NPA. However, applying auxin synthesis inhibitors L-kynurenine (kyn) and yucasin alleviated the tomato root growth inhibition caused by Cd stress; between them, the effect of yucasin was more pronounced. Yucasin mitigates Cd toxicity in tomato seedlings by reducing Cd2+ absorption and auxin accumulation, strengthening ROS scavenging, and reducing cell death in roots. These observations suggest that yucasin potentially mitigates Cd toxicity and improves the tolerance of tomato seedlings to Cd stress.

Funder

Natural Science Foundation of the Education Department of Anhui

Undergraduate Innovation and Entrepreneurship Training Program

Publisher

MDPI AG

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