Drought-inducible expression of Hv-miR827 enhances drought tolerance in transgenic barley
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Drought is one of the major abiotic stresses reducing crop yield. Since the discovery of plant microRNAs (miRNAs), considerable progress has been made in clarifying their role in plant responses to abiotic stresses, including drought. miR827 was previously reported to confer drought tolerance in transgenic Arabidopsis. We examined barley (Hordeum vulgare L. ‘Golden Promise’) plants over-expressing miR827 for plant performance under drought. Transgenic plants constitutively expressing CaMV-35S::Ath-miR827 and drought-inducible Zm-Rab17::Hv-miR827 were phenotyped by non-destructive imaging for growth and whole plant water use efficiency (WUEwp). We observed that the growth, WUEwp, time to anthesis and grain weight of transgenic barley plants expressing CaMV-35S::Ath-miR827 were negatively affected in both well-watered and drought-treated growing conditions compared with the wild-type plants. In contrast, transgenic plants over-expressing Zm-Rab17::Hv-miR827 showed improved WUEwp with no growth or reproductive timing change compared with the wild-type plants. The recovery of Zm-Rab17::Hv-miR827 over-expressing plants also improved following severe drought stress. Our results suggest that Hv-miR827 has the potential to improve the performance of barley under drought and that the choice of promoter to control the timing and specificity of miRNA expression is critical.
KeywordsAth-miR827 Hv-miR827 Non-destructive imaging Promoter
This research was supported by a grant to the Australian Centre for Plant Functional Genomics, supported through research funding from DuPont/Pioneer (USA). Our grateful thanks to Patricia Warner and ACPFG Transformation Group for barley transformation; Margaret Pallotta and Suzanne Manning for their assistance with Southern blotting; and Dr. Sergiy Lopato, Dr. Ainur Ismagul and Dr. Nataliya Kovalchuk for generation and selection of the Zm-Rab17::GUS transgenic barley germplasm. We specially thank the team of The Plant Accelerator for technical support in running the experiment and conducting the image analysis. The Plant Accelerator, Australian Plant Phenomics Facility, is funded under the National Collaborative Infrastructure Strategy. We are thankful to Dr. Ursula Langridge, Alex Kovalchuk and Yuri Onyskiv for their assistance with growing plants at different phases of this experiment, and Yuan Li and Hui Zhou for performing the qRT-PCR assays. We also thank Dr. Bu-Jun Shi for his advice at the early stage of this experiment.
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