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Autoimmune response and repression of mitotic cell division occur in interspecific crosses between tetraploid wheat and Aegilops tauschii Coss. showing low temperature-induced hybrid necrosis.
MedLine Citation:
PMID:  21645146     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Common wheat is an allohexaploid species originating from a naturally occurring interspecific cross between tetraploid wheat and the diploid wild wheat Aegilops tauschii Coss. Artificial allopolyploidization can produce synthetic hexaploid wheat. However, synthetic triploid hybrids can show four types of hybrid growth abnormalities: types II and III hybrid necrosis, hybrid chlorosis, and severe growth abortion. Of these hybrid abnormalities, type II necrosis is induced by low temperature. Under low temperature, elongation of stems and expansion of new leaves is repressed in type II necrosis lines, which later exhibit necrotic symptoms. Here, we characterize type II necrosis in detail. Comparative transcriptome analysis showed that a number of defense-related genes were highly up-regulated in seedling leaves showing type II necrosis. Transmission electron microscopy revealed extensive cell death in the leaves under low temperature, accompanied by abundant generation of reactive oxygen species. In addition, down-regulation of cell cycle-related genes was observed in shoot apices of type II necrosis lines under low temperature. Quantitative reverse transcription (RT)-PCR and in situ hybridization showed repression of Histone H4 transcript accumulation in the shoot apical meristem (SAM) of type II necrosis lines. These results strongly suggest that an autoimmune response-like reaction and repression of cell division in the SAM are associated with the abnormal growth phenotype in type II necrosis lines.
Authors:
Nobuyuki Mizuno; Naoki Shitsukawa; Naoki Hosogi; Pyoyun Park; Shigeo Takumi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-3
Journal Detail:
Title:  The Plant journal : for cell and molecular biology     Volume:  -     ISSN:  1365-313X     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9207397     Medline TA:  Plant J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Blackwell Publishing Ltd and the Society for Experimental Biology.
Affiliation:
Laboratory of Plant Genetics, Graduate School of Agricultural Science, Kobe University, Nada-ku, Kobe 657-8501, Japan Institute of Plant Science and Resources, Okayama University, Chuo, Kurashiki, Okayama 710-0046, Japan Laboratory of Stress Cytology, Graduate School of Agricultural Science, Kobe University, Nada-ku, Kobe 657-8501, Japan.
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