Are males and females of Populus cathayana differentially sensitive to Cd stress?

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Liu , M , Liu , X , Kang , J , Korpelainen , H & Li , C 2020 , ' Are males and females of Populus cathayana differentially sensitive to Cd stress? ' , Journal of Hazardous Materials , vol. 393 , 122411 . https://doi.org/10.1016/j.jhazmat.2020.122411

Title: Are males and females of Populus cathayana differentially sensitive to Cd stress?
Author: Liu, Miao; Liu, Xingxing; Kang, Jieyu; Korpelainen, Helena; Li, Chunyang
Contributor: University of Helsinki, Department of Agricultural Sciences
Date: 2020-07-05
Language: eng
Number of pages: 13
Belongs to series: Journal of Hazardous Materials
ISSN: 0304-3894
URI: http://hdl.handle.net/10138/323970
Abstract: This study clarifies the mechanisms of Cd uptake, translocation and detoxification in Populus cathayana Rehder females and males, and reveals a novel strategy for dioecious plants to cope with Cd contamination. Females exhibited a high degree of Cd uptake and root-to-shoot translocation, while males showed extensive Cd accumulation in roots, elevated antioxidative capacity, and effective cellular and bark Cd sequestration. Our study also found that Cd is largely located in epidermal and cortical tissues of male roots and leaves, while in females, more Cd was present in vascular tissues of roots and leaves, as well as in leaf mesophyll. In addition, the distributions of sulphur (S) and phosphorus (P) were very similar as that of Cd in males, but the associations were weak in females. Scanning electron microscopy and energy spectroscopy analyses suggested that the amounts of tissue Cd were positively correlated with P and S amounts in males, but not in females (a weak correlation between S and Cd). Transcriptional data suggested that Cd stress promoted the upregulation of genes related to Cd uptake and translocation in females, and that of genes related to cell wall biosynthesis, metal tolerance and secondary metabolism in males. Our results indicated that coordinated physiological, microstructural and transcriptional responses to Cd stress endowed superior Cd tolerance in males compared with females, and provided new insights into mechanisms underlying sexually differential responses to Cd stress.
Subject: Dioecy
Sexual differences
Cd stress
Cd uptake
Cd sequestration
Transcripts
SEX-RELATED DIFFERENCES
CADMIUM ACCUMULATION
PHYSIOLOGICAL-RESPONSES
CELL-WALL
TOLERANCE
METABOLISM
NITROGEN
PLANTS
ALLOCATION
TOXICITY
1182 Biochemistry, cell and molecular biology
11831 Plant biology
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