Abstract:
:With the enhancement of copper (Cu) stress, the germination percentage of wheat seeds decreased gradually. Pretreatment with sodium hydrosulfide (NaHS), hydrogen sulfide (H(2)S) donor alleviated the inhibitory effect of Cu stress in a dose-dependent manner; whereas little visible symptom was observed in germinating seeds and radicle tips cultured in NaHS solutions. It was verified that H(2)S or HS(-) rather than other sulfur-containing components derived from NaHS attribute to the potential role in promoting seed germination against Cu stress. Further studies showed that NaHS could promote amylase and esterase activities, reduce Cu-induced disturbance of plasma membrane integrity in the radicle tips, and sustain lower levels of malondialdehyde and H(2)O(2) in germinating seeds. Furthermore, NaHS pretreatment increased activities of superoxide dismutase and catalase and decreased that of lipoxygenase, but showed no significant effect on ascorbate peroxidase. Alternatively, NaHS prevented uptake of Cu and promoted the accumulation of free amino acids in seeds exposed to Cu. In addition, a rapid accumulation of endogenous H(2)S in seeds was observed at the early stage of germination, and higher level of H(2)S in NaHS-pretreated seeds. These data indicated that H(2)S was involved in the mechanism of germinating seeds' responses to Cu stress.
journal_name
J Integr Plant Bioljournal_title
Journal of integrative plant biologyauthors
Zhang H,Hu LY,Hu KD,He YD,Wang SH,Luo JPdoi
10.1111/j.1744-7909.2008.00769.xsubject
Has Abstractpub_date
2008-12-01 00:00:00pages
1518-29issue
12eissn
1672-9072issn
1744-7909pii
JIPB769journal_volume
50pub_type
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