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Title 

Transgenic poplar expressing Arabidopsis YUCCA6 exhibits auxin-overproduction phenotypes and increased tolerance to abiotic stress

Authors 

Qingbo KeZ WangChang Yoon JiJae Cheol JeongHaeng Soon LeeH LiB XuX DengSang Soo Kwak

Publisher 

Elsevier

Issue Date 

2015

Citation 

Plant Physiology & Biochemistry, vol. 94, no. 1, pp. 19-27

Keywords 

Abiotic stressAtYUCCA6AuxinROSTransgenic poplar

Abstract 

YUCCA6, a member of the YUCCA family of flavin monooxygenase-like proteins, is involved in the tryptophan-dependent IAA biosynthesis pathway and responses to environmental cues in Arabidopsis. However, little is known about the role of the YUCCA pathway in auxin biosynthesis in poplar. Here, we generated transgenic poplar (Populus alba × P. glandulosa) expressing the Arabidopsis YUCCA6 gene under the control of the oxidative stress-inducible SWPA2 promoter (referred to as SY plants). Three SY lines (SY7, SY12 and SY20) were selected based on the levels of AtYUCCA6 transcript. SY plants displayed auxin-overproduction morphological phenotypes, such as rapid shoot growth and retarded main root development with increased root hair formation. In addition, SY plants had higher levels of free IAA and early auxin-response gene transcripts. SY plants exhibited tolerance to drought stress, which was associated with reduced levels of reactive oxygen species. Furthermore, SY plants showed delayed hormone- and dark-induced senescence in detached leaves due to higher photosystem II efficiency and less membrane permeability. These results suggest that the conserved IAA biosynthesis pathway mediated by YUCCA family members exists in poplar.

ISSN 

0981-9428

Link 

http://dx.doi.org/10.1016/j.plaphy.2015.05.003

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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