Sucrose Transporter StSUT2 Affects Potato Plants Growth, Flowering Time, and Tuber Yield

Author:

Gong Hui-Ling1,Liu Jin-Bao12,Igiraneza Clement1,Dusengemungu Leonce1

Affiliation:

1. School of Life Sciences and Engineering, Lanzhou University of Technology, 287 Langongping Road, Lanzhou 730050, China

2. Guangdong Hybribio Biotech Co., Ltd., Building 2, National Biomedical Industry Base, Yuzhong Park, Lanzhou 730100, China

Abstract

Background: Sucrose transporters (SUTs) mediate sucrose phloem loading in source tissue and sucrose unloading into sink tissue in potatoes and higher plants, thus playing a crucial role in plant growth and development. In potatoes, the physiological function of the sucrose transporters StSUT1 and StSUT4 has been clarified, whereas the physiological role of StSUT2 is not yet fully understood. Methods and Results: This study analyzed the relative expression of StSUT2 compared to that of StSUT1 and StSUT4 in different tissues from potatoes and its impact on different physiological characteristics by using StSUT2-RNA interference lines. Here, we report a negative effect of StSUT2-RNA interference on plant height, fresh weight, internodes number, leaf area, flowering time, and tuber yield. However, our data indicate that StSUT2 is not involved in carbohydrate accumulation in potato leaves and tubers. In addition, the data of the RNA-seq between the StSUT2-RNA interference line and WT showed that 152 genes were differentially expressed, of which 128 genes were upregulated and 24 genes were downregulated, and the GO and KEGG analyses revealed that differentially expressed genes were mainly related to cell wall composition metabolism. Conclusions: Thus, StSUT2 functions in potato plant growth, flowering time, and tuber yield without affecting carbohydrate accumulation in the leaves and tubers but may be involved in cell wall composition metabolism.

Funder

National Natural Science Foundation of China (NSFC)-Regional Science Fund

open Project of the State Key Laboratory of Crop Stress Biology for Arid Areas of China

Key Program of Natural Science Foundation of Gansu Province in China

Publisher

MDPI AG

Subject

Microbiology (medical),Molecular Biology,General Medicine,Microbiology

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