The effects of K+-deficiency on H2O2 dynamics and sucrose in tomato

Xiaoming Zhao, Ning Zhang, Xin Liu and Jing Jiang
Additional contact information
Xiaoming Zhao: College of Life Science and Bioengineering, Shenyang University, Shenyang, P.R. China
Ning Zhang: College of Horticulture, Science and Technology, Hebei Normal University of Science & Technology, Hebei Key Laboratory of Horticultural Germplasm Excavation and Innovative Utilization, Qinhuangdao, Hebei, P.R. China
Xin Liu: College of Horticulture, Shenyang Agricultural University, Key Laboratory of Protected Horticulture, Ministry of Education, Shenyang, P.R. China
Jing Jiang: College of Horticulture, Shenyang Agricultural University, Key Laboratory of Protected Horticulture, Ministry of Education, Shenyang, P.R. China

Horticultural Science, 2021, vol. 48, issue 2, 90-97

Abstract: Potassium (K+) deficiency inhibits the transport of photosynthetic products and causes severe crop yield losses. However, the underlying mechanisms are poorly understood. In this study, we used two tomato lines 081018 (K+-deficiency-sensitive) and 081034 (K+-deficiency-tolerant), showing tolerance to K+ deficiency to investigate the relationship between the H2O2 and sucrose in the tomato under K+-deficiency. The H2O2 accumulation was increased by the low K+ condition (0.5 mM) after 8 h in 081018. The enzymes related to the metabolism of H2O2 were decreased, and more malondialdehyde (MDA) was produced. After 24 h, the sucrose content had accumulated significantly in the leaves, however, it was deficient in the roots, and the expression level of the sucrose transporters (SUT1) was inhibited. In 081034, the activity of antioxidant enzymes was increased under K+-deficiency, and then the H2O2 subsequently returned to the control treatment (4 mM) levels and did not produce more MDA. The sucrose content was not significantly different from the control treatment after 24 h. The expression of SUT1 was not suppressed. These results suggested that the H2O2 dynamics played different roles in the two different strains. The transportation of sucrose was suppressed by the H2O2 from the leaf (source) to the root (sink) in 081018, and unrestricted by the advantageous reactive oxygen species dynamics capacity in 081034.

Keywords: low K+ stress; oxidation; antioxidant enzyme activity; sucrose transport; SUT1 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://hortsci.agriculturejournals.cz/doi/10.17221/103/2020-HORTSCI.html (text/html)
http://hortsci.agriculturejournals.cz/doi/10.17221/103/2020-HORTSCI.pdf (application/pdf)
free of charge

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlhor:v:48:y:2021:i:2:id:103-2020-hortsci

DOI: 10.17221/103/2020-HORTSCI

Access Statistics for this article

Horticultural Science is currently edited by Ing. Eva Karská (Executive Editor)

More articles in Horticultural Science from Czech Academy of Agricultural Sciences
Bibliographic data for series maintained by Ivo Andrle ().