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Overexpression of PSK-γ in Arabidopsis promotes growth without influencing pattern-triggered immunity

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journal contribution
posted on 2019-10-31, 10:37 authored by Yumin Liu, Danping Zhang, Mei Li, Junhui Yan, Li Luo, Liangliang Yu

Phytosulfokine-α (PSK-α) is a disulfated pentapeptide with the sequence YIYTQ. As a new peptide hormone, PSK-α promotes plant growth and development but represses pattern-triggered immunity (PTI) against bacterial pathogens. Our recent study identified a novel phytosulfokine, PSK-γ, from soybean. The sequence of PSK-γ is YVYTQ in which the tyrosines are sulfated. Expression of PSK-γ significantly increased seed size and weight in transgenic plants by inducing embryo cell expansion. In this study, we further found that the constitutive expression of PSK-γ in Arabidopsis promotes the growth of vegetative organs as well as seeds. Moreover, overexpressed PSK-γ does not influence plant PTI against bacterial pathogens. These findings demonstrate a potential use of PSK-γ in genetic improvement of crop growth and yield by molecular breeding.

Funding

This work was supported by the National Natural Science Foundation of China [31500197].

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