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The chrysanthemum lavandulifolium genome and the molecular mechanism underlying diverse capitulum types
Horticulture Research ( IF 7.6 ) Pub Date : 2022-01-20 , DOI: 10.1093/hr/uhab022 Xiaohui Wen 1, 2 , Junzhuo Li 1 , Lili Wang 3 , Chenfei Lu 1 , Qiang Gao 2 , Peng Xu 4, 5 , Ya Pu 1 , Qiuling Zhang 1 , Yan Hong 1 , Luo Hong 1 , He Huang 1 , Huaigen Xin 3 , Xiaoyun Wu 1 , Dongru Kang 6 , Kang Gao 1 , Yajun Li 1 , Chaofeng Ma 1 , Xuming Li 3 , Hongkun Zheng 3 , Zicheng Wang 6 , Yuannian Jiao 4, 5 , Liangsheng Zhang 2 , Silan Dai 1
更新日期：2022-01-20
Horticulture Research ( IF 7.6 ) Pub Date : 2022-01-20 , DOI: 10.1093/hr/uhab022 Xiaohui Wen 1, 2 , Junzhuo Li 1 , Lili Wang 3 , Chenfei Lu 1 , Qiang Gao 2 , Peng Xu 4, 5 , Ya Pu 1 , Qiuling Zhang 1 , Yan Hong 1 , Luo Hong 1 , He Huang 1 , Huaigen Xin 3 , Xiaoyun Wu 1 , Dongru Kang 6 , Kang Gao 1 , Yajun Li 1 , Chaofeng Ma 1 , Xuming Li 3 , Hongkun Zheng 3 , Zicheng Wang 6 , Yuannian Jiao 4, 5 , Liangsheng Zhang 2 , Silan Dai 1
Affiliation
Abstract
Cultivated chrysanthemum (Chrysanthemum × morifolium Ramat.) is a beloved ornamental crop due to the diverse capitula types among varieties, but the molecular mechanism of capitulum development remains unclear. Here, we report a 2.60 Gb chromosome-scale reference genome of C. lavandulifolium, a wild Chrysanthemum species found in China, Korea and Japan. The evolutionary analysis of the genome revealed that only recent tandem duplications occurred in the C. lavandulifolium genome after the shared whole genome triplication (WGT) in Asteraceae. Based on the transcriptomic profiling of six important developmental stages of the radiate capitulum in C. lavandulifolium, we found genes in the MADS-box, TCP, NAC and LOB gene families that were involved in disc and ray floret primordia differentiation. Notably, NAM and LOB30 homologs were specifically expressed in the radiate capitulum, suggesting their pivotal roles in the genetic network of disc and ray floret primordia differentiation in chrysanthemum. The present study not only provides a high-quality reference genome of chrysanthemum but also provides insight into the molecular mechanism underlying the diverse capitulum types in chrysanthemum.
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