Function Analysis of SlPLATZ18 in Regulating Low Temperature Stress and ABA Signal Response in Tomato

doi:10.16420/j.issn.0513-353x.2025-0092

Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (12): 3229-3242.doi: 10.16420/j.issn.0513-353x.2025-0092

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles Next Articles

Function Analysis of SlPLATZ18 in Regulating Low Temperature Stress and ABA Signal Response in Tomato

FAN Bei¹, REN Min¹, WANG Yanfeng¹^,², CHEN Guoliang¹^,², DANG Fengfeng¹^,², CHENG Guoting¹^,², SUN Huiru¹^,²^,^*()

¹ College of Life Sciences，Yan’an University，Yan’an，Shaanxi，716000，China
² Shaanxi Key Laboratory of Research and Utilization of Resource Plants on the Loess Plateau，College of Life Sciences，Yan’an University，Yan’an，Shaanxi，716000，China

Received:2025-05-03 Revised:2025-07-21 Online:2025-12-25 Published:2025-12-20
Contact: SUN Huiru

Abstract

Abstract:

PLATZ transcription factors play crucial roles in plant response to abiotic stress. The open reading frame（ORF）of SlPLATZ18 was cloned from‘Micro-Tom’tomato. The length of ORF was 687 bp，encoding 228 amino acids. Sequence alignment and phylogenetic tree analysis revealed that SlPLATZ18 had higher homology with StPLATZ9/11 and GhPLATZ1. The SlPLATZ18-overexpressing tomato lines （SlPLATZ18-OE）were generated via genetic transformation. Under low temperature stress，compared to the wild type（WT），SlPLATZ18-OE plants exhibited reduced the accumulation of reactive oxygen species（ROS），enhanced the activities of superoxide dismutase（SOD），peroxidase（POD）and catalase（CAT），increased the content of proline（Pro），decreased the content of malondialdehyde（MDA）and the relative conductivity. Additionally，the expressions of the cold-responsive genes（SlCBF1，SlCBF3，SlCOR47-like，and SlRD29A）were significantly upregulated in SlPLATZ18-OE than those of WT. The cold tolerance of SlPLATZ18-OE plants was markedly improved. Furthermore，under ABA treatment，the seed germination rates and primary root lengths of SlPLATZ18-OE were significantly higher than those of WT. It was speculated that SlPLATZ18 positively regulated low temperature stress response and negatively regulated ABA signal response in tomato.

Key words: tomato, SlPLATZ18, low temperature, ABA

FAN Bei, REN Min, WANG Yanfeng, CHEN Guoliang, DANG Fengfeng, CHENG Guoting, SUN Huiru. Function Analysis of SlPLATZ18 in Regulating Low Temperature Stress and ABA Signal Response in Tomato[J]. Acta Horticulturae Sinica, 2025, 52(12): 3229-3242.

Figures/Tables 8

Table 1 Primers used in this study

用途 Purpose	引物名称 Primer name	引物序列（5′-3′） Primer sequence
qRT-PCR	SlPLATZ18-Q-F	TCCACCAAAGTTTCAGTCCGT
	SlPLATZ18-Q-R	CGGAATCCCCTTTCTTCGCTT
	SlCBF1-Q-F	GAGTCGGAAGAAGTTTCAGG
	SlCBF1-Q-R	TGTAGGCATCAGTTTCCAC
	SlCBF3-Q-F	TGCCGGGTTTACTTACGAAT
	SlCBF3-Q-R	TCAGCTTCCACATGATCTCC
	SlCOR47-like-Q-F	TCTAGTAGCTCCAGTGATG
	SlCOR47-like-Q-R	TCTCCTCTGTTTCCTCGT
	SlRD29A-Q-F	AAAAATGAAGACGTGCATAGGC
	SlRD29A-Q-R	GTTTTCCAACGGAACCAACATA
	SlEF1α-Q-F	GACAGGCGTTCAGGTAAGG
	SlEF1α-Q-R	CCAATGGAGGGTATTCAGC
基因克隆Gene clone	SlPLATZ 18-ORF-F	ATGGGAGCTGGAGGACCTG
	SlPLATZ 18-ORF-R	TTAATAACCTATAACTAGTCCTCCC
过表达载体构建	SlPLATZ18-OE-F	CACGGGGGACTCTAGAATGGGAGCTGGAGGACCTG
Overexpression vector	SlPLATZ18-OE-R	GACGGCCAGTGAGCTCTTAATAACCTATAACTAGTCCTCCC
转基因株系鉴定 Identification	35S	CTATCCTTCGCAAGACCCTTC
overexpression tomato line	18-OE-R	ATACCTGTGAAGTCTGTGAAAG

Fig. 1 Phylogenetic tree of SlPLATZ18 and other species PLATZ proteins

Fig. 2 Multiple sequence alignment of PLATZ proteins from different species Sl：Solanum lycopersicum；St：S. tuberosum；Gh：Gossypium hirsutum；Phe：Phyllostachys edulis；At：Arabidopsis thaliana；Gm：Glycine max；Pt：Populus trichocarpa

Fig. 3 PCR validation（A）and SlPLATZ18 expression（B）of overexpressed tomato lines t-test. ** indicates significant differences between SlPLATZ18-OE and WT（P < 0.01）. The same below

Fig. 4 Phenotype（A）and DAB and NBT staining（B）of SlPLATZ18-OE and WT tomato under low temperature treatment

Fig. 5 Physiological indices of SlPLATZ18-OE and WT tomato plants under low temperature treatment

Fig. 6 Expressions of cold-related genes in SlPLATZ18-OE and WT tomato plants under low temperature treatment * P < 0.05；** P < 0.01

Fig. 7 Seed germination of SlPLATZ18-OE and WT tomato under ABA treatment

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Function Analysis of SlPLATZ18 in Regulating Low Temperature Stress and ABA Signal Response in Tomato

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