Integrated multi-omics analysis provides insights into the genome evolution and phosphorus deficiency adaptation in pigeonpea (Cajanus cajan),Horticulture Research

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Integrated multi-omics analysis provides insights into the genome evolution and phosphorus deficiency adaptation in pigeonpea (Cajanus cajan)
Horticulture Research ( IF 7.6 ) Pub Date : 2022-05-17 , DOI: 10.1093/hr/uhac107
Chun Liu ₁ , Yuling Tai ₂ , Jiajia Luo ₁ , Yuanhang Wu ₃ , Xingkun Zhao ₃ , Rongshu Dong ₁ , Xipeng Ding ₁ , Shancen Zhao ₄ , Lijuan Luo ₃ , Pandao Liu ₁ , Guodao Liu ₁

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Pigeonpea (Cajanus cajan) is an important legume food crop and plays a crucial role in a secure food supply in many developing countries. Several previous studies have suggested that pigeonpea has great potential for phosphorus (P) deficiency tolerance, but little is known about the underlying mechanism. In this study, the physiological and molecular responses of pigeonpea roots to phosphate (Pi) starvation were investigated through integrating phenotypic, genomic, transcriptomic, metabolomic, and lipidomic analyses. The results showed that low-Pi treatment increased the total root length, root surface area, and root acid phosphatase activity, and promoted the secretion of organic acids (e.g. citric acids, piscidic acids, and protocatechuic acids) and the degradation of phospholipids and other P-containing metabolites in the roots of pigeonpea. Consistent with the morphological, physiological, and biochemical changes, a large number of genes involved in these Pi-starvation responses (PSR) were significantly up-regulated in Pi-deficient pigeonpea roots. Among these PSR genes up-regulated by low-Pi treatment, four gene families were expanded through recent tandem duplication in the pigeonpea genome, namely phosphate transporter 1 (PHT1), phosphoethanolamine/phosphocholine phosphatase (PECP), fasciclin-like arabinogalactan protein (FLA), and glutamate decarboxylase (GAD). These gene families may be associated with Pi uptake from the soils, phospholipid recycling, root morphological remodeling, and regulation of organic acid exudation. Taken together, our results suggest that pigeonpea employs complex PSR to strengthen P acquisition and utilization during low-Pi stress. This study provides new insights into the genome evolution and P deficiency adaptation mechanism of pigeonpea.

更新日期：2022-05-17

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