RRC ID 36345
Author Nakano H, Mizuno N, Tosa Y, Yoshida K, Park P, Takumi S.
Title Accelerated senescence and enhanced disease resistance in hybrid chlorosis lines derived from interspecific crosses between tetraploid wheat and Aegilops tauschii.
Journal PLoS One
Abstract Hybrid chlorosis, a type of hybrid incompatibility, has frequently been reported in inter- and intraspecific crosses of allopolyploid wheat. In a previous study, we reported some types of growth abnormalities such as hybrid necrosis and observed hybrid chlorosis with mild or severe abnormalities in wheat triploids obtained in crosses between tetraploid wheat cultivar Langdon and four Ae. tauschii accessions and in their derived synthetic hexaploids. However, the molecular mechanisms underlying hybrid chlorosis are not well understood. Here, we compared cytology and gene expression in leaves to characterize the abnormal growth in wheat synthetics showing mild and severe chlorosis. In addition, we compared disease resistance to wheat blast fungus. In total 55 and 105 genes related to carbohydrate metabolism and 53 and 89 genes for defense responses were markedly up-regulated in the mild and severe chlorosis lines, respectively. Abnormal chloroplasts formed in the mesophyll cells before the leaves yellowed in the hybrid chlorosis lines. The plants with mild chlorosis showed increased resistance to wheat blast and powdery mildew fungi, although significant differences only in two, third internode length and maturation time, out of the examined agricultural traits were found between the wild type and plants showing mild chlorosis. These observations suggest that senescence might be accelerated in hybrid chlorosis lines of wheat synthetics. Moreover, in wheat synthetics showing mild chlorosis, the negative effects on biomass can be minimized, and they may show substantial fitness under pathogen-polluted conditions.
Volume 10(3)
Pages e0121583
Published 2015-1-1
DOI 10.1371/journal.pone.0121583
PII PONE-D-14-41404
PMID 25806790
PMC PMC4373817
MeSH Disease Resistance / genetics* Genes, Plant* Hybridization, Genetic* Phenotype Plant Leaves / genetics Poaceae / genetics* Tetraploidy Triticum / genetics*
IF 2.74
Times Cited 12
Wheat LPGKU2272(Langdon) KU-2059 KU-2078 KU-2126 KU-2159 KU-20-1 KU-2111 KU-2069