Selection of flooding stress tolerant sweetpotato cultivars based on biochemical and phenotypic characterization

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Title
Selection of flooding stress tolerant sweetpotato cultivars based on biochemical and phenotypic characterization
Author(s)
Sul-U Park; Chan-Ju Lee; So-Eun Kim; Ye-Hoon Lim; H U Lee; S S Nam; Ho Soo KimSang Soo Kwak
Bibliographic Citation
Plant Physiology and Biochemistry, vol. 155, pp. 243-251
Publication Year
2020
Abstract
Sweetpotato [Ipomoea batatas (L.) Lam] serves as a sustainable food source and ensures nutrition security in the face of climate change. Recently, farmers have developed increased interest in replacing rice with sweetpotato in paddy fields for higher income. However, sweetpotato is more susceptible to flooding stress than other abiotic stresses including drought and salinity. Here, we selected flooding tolerant sweetpotato cultivars based on biochemical characterization. Young seedlings of 33 sweetpotato cultivars were subjected to flooding stress for 20 days, and Yeonjami (YJM) was identified as the most flooding tolerant sweetpotato cultivar. Plant growth and biochemical characteristics of YJM were compared with those of Jeonmi (JM), a flooding sensitive sweetpotato cultivar. Under flooding stress, YJM showed higher content of chlorophyll and lower inhibition of plant height and fibrous root length than JM. Biochemical characterization revealed that although malondialdehyde and hydrogen peroxide contents were increased in fibrous roots of both cultivars, the amount of increase was 4-fold lower in YJM than in JM. Additionally, leaves of YJM showed higher ascorbate peroxidase activity than those of JM under flooding stress. Our results suggest that high membrane stability and antioxidant capacity are important flooding tolerance factors in sweetpotato. Furthermore, several flooding tolerance-related genes involved in starch and sucrose metabolism, fermentation, and cell wall loosening showed earlier induction and higher transcript levels in YJM leaves and fibrous roots than in JM tissues under flooding stress. Thus, phenotypic and biochemical characterization suggests that YJM could be used as a flooding tolerant sweetpotato cultivar.
Keyword
APX activityChlorophyll contentsFlooding stressGene expressionSweetpotato
ISSN
0981-9428
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.plaphy.2020.07.039
Type
Article
Appears in Collections:
Division of Research on National Challenges > Plant Systems Engineering Research > 1. Journal Articles
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