The regulation of root growth in response to phosphorus deficiency mediated by phytohormones in a Tibetan wild barley accession

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• 作者：Umme Aktari Nadira ; Imrul Mosaddek Ahmed ; Feibo Wu…
• 关键词：Low phosphorus tolerance ; Phosphorus efficiency ; Phytohormone ; Root system architecture ; Tibetan wild barley (Hordeum vulgare L. ssp. spontaneum)
• 刊名：Acta Physiologiae Plantarum
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：38
• 期：4
• 全文大小：3,654 KB
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• 作者单位：Umme Aktari Nadira (1)
  Imrul Mosaddek Ahmed (1)
  Feibo Wu (1)
  Guoping Zhang (1)
  
  1. Institute of Crop Science, Department of Agronomy, College of Agriculture and Biotechnology, Zijingang Campus, Zhejiang University, Hangzhou, 310058, China
  
• 刊物主题：Plant Physiology; Plant Genetics & Genomics; Plant Biochemistry; Plant Pathology; Plant Anatomy/Development; Agriculture;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-1664

文摘

Low phosphorus (LP) causes a dramatic change of root system architecture in plants, which is possibly mediated by signaling pathways of hormones. In order to understand the regulatory mechanisms of the root development under LP, we examined the potential role of phytohormones in response to LP using three barley genotypes, differing in LP tolerance, namely 2 Tibetan wild barley genotypes XZ99 (LP tolerant) and XZ100 (LP sensitive), and a cultivated barley ZD9 (LP moderately tolerant). The results showed that LP stress caused a number of changes in root development, with XZ99 having less primary root growth inhibition, more lateral root and root hair formation than the other two genotypes. Meanwhile, LP stress also resulted in the dramatic changes in plant hormone contents, with changed extent and pattern differing among the three genotypes. The relative expression of genes responsible for indole acetic acid (IAA) and ethylene synthesis in roots also showed a significant difference among genotypes in both control and LP conditions. It can be concluded that the root system of Tibetan wild barley XZ99 adapts to phosphorus deficiency by changing the signal transduction pathway mediated by auxin, ethylene and cytokinins. However, further studies are needed to elucidate the behaviors of the key genes involved in the hormone-related response.