Sexual Differences in Physiological and Transcriptional Responses to Salinity Stress of Salix linearistipularis

Frontiers in Plant Science
Shuang FengShenkui Liu

Abstract

Willow (Salix), a dioecious plant, is an important ornamental tree species in the world. Salix linearistipularis, a perennial woody plant species naturally distributed on the Songnen Plain saline-alkali land in northeast China, has a high saline condition. To study the sexual differences of S. linearistipularis in salinity tolerance, the physiological and transcriptional responses to salinity were compared between female and male cuttings. Under salinity stress, the female leaves exhibited higher superoxide dismutase and peroxidase activities and photosynthetic capacity, and lower H2O2 contents than those of male leaves. Under salinity stress, sodium (Na+) accumulation in female leaves was lower than that in the male leaves. The non-invasive micro-test showed that the net Na+ efflux in the salt-treated female roots was higher than that in male roots. Physiological responses revealed that female cuttings were more tolerant than males, which may be mainly due to females having lower leaf Na+ accumulation and higher root Na+ efflux capacity than males. Transcriptional analyses showed that 108 differentially expressed salt-responsive genes were identified in both female and male roots; most of these showed sexual differences in exp...Continue Reading

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Datasets Mentioned

BETA
GSE138551

Methods Mentioned

BETA
environmental stress
transcription profiling
MDA
Fluorescence
Illumina sequencing
RNA-seq

Software Mentioned

SPSS
iFluxes
R
imFluxes

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