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Altered expression of Ta RSL 4 gene by genome interplay shapes root hair length in allopolyploid wheat
Author(s) -
Han Yao,
Xin Mingming,
Huang Ke,
Xu Yuyun,
Liu Zhenshan,
Hu Zhaorong,
Yao Yingyin,
Peng Huiru,
Ni Zhongfu,
Sun Qixin
Publication year - 2016
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.13615
Subject(s) - polyploid , ploidy , biology , root hair , genome , gene , plant genetics , botany , domestication , genetics
Summary Polyploidy is a major driving force in plant evolution and speciation. Phenotypic changes often arise with the formation, natural selection and domestication of polyploid plants. However, little is known about the consequence of hybridization and polyploidization on root hair development. Here, we report that root hair length of synthetic and natural allopolyploid wheats is significantly longer than those of their diploid progenitors, whereas no difference is observed between allohexaploid and allotetraploid wheats. The expression of wheat gene Ta RSL 4 , an orthologue of At RSL 4 controlling the root hair development in Arabidopsis , was positively correlated with the root hair length in diploid and allotetraploid wheats. Moreover, transcript abundance of Ta RSL 4 homoeologue from A genome ( Ta RSL 4‐A ) was much higher than those of other genomes in natural allopolyploid wheat. Notably, increased root hair length by overexpression of the Ta RSL 4‐A in wheat led to enhanced shoot fresh biomass under nutrient‐poor conditions. Our observations indicate that increased root hair length in allohexaploid wheat originated in the allotetraploid progenitors and altered expression of Ta RSL 4 gene by genome interplay shapes root hair length in allopolyploid wheat.