Hippeastrum, a highly diverse genus in the Amaryllidaceae family, is a valuable ornamental bulbous flowering plant. Somatic embryogenesis(SE) is an efficient method for mass production of Hippeastrum plantlets. Previo...Hippeastrum, a highly diverse genus in the Amaryllidaceae family, is a valuable ornamental bulbous flowering plant. Somatic embryogenesis(SE) is an efficient method for mass production of Hippeastrum plantlets. Previous studies have been devoted to the in vitro propagation of Hippeastrum, but the SE and its regulatory networks are rarely reported. In this study, we established a direct SE method of Hippeastrum Bangkok Rose' using leaf bases as explants. MS supplemented with 1.00 mg·L^(-1)NAA +1.00 mg·L^(-1)KT + 0.25 mg·L^(-1)TDZ was the optimal medium for SE. Histological observations showed that the bipolar somatic embryo originated from the epidermal cell layer and underwent initiation,globular, scutellar and coleoptile stages. During SE, endogenous hormones of IAA, CTK, ABA, and SA were highly accumulated. Transcriptomic analysis revealed the genes encoding auxin biosynthesis/metabolic enzymes and efflux carriers were induced, while the auxin receptor of TIR1 and ARF transcriptional repressor of Aux/IAA were down-regulated and up-regulated, respectively, leading to suppression of auxin signaling. In contrast, cytokine signaling was promoted at the early stage of SE, as biosynthesis, transport, and signaling components were up-regulated.Various stress-related genes were up-regulated at the early or late stages of SE. Chromatin remodeling could also be dynamically regulated via distinct expression enzymes that control histone methylation and acetylation during SE. Moreover, key SE regulators, including WOXs and SERKs were highly expressed along with SE. Overall, the present study provides insights into the SE regulatory mechanisms of the Hippeastrum.展开更多
‘包美1号’(Hippeastrum‘Bao Mei Yi Hao’)是以‘日耳曼’(H.parodii‘Germa’)为母本,自育品种‘条纹’(‘Tiaowen’)为父本,进行人工杂交选育出的喇叭型优良朱顶红新品种。花单瓣,主色橘红色,中部和边缘黄绿色,喉部绿色。花径14.6 ...‘包美1号’(Hippeastrum‘Bao Mei Yi Hao’)是以‘日耳曼’(H.parodii‘Germa’)为母本,自育品种‘条纹’(‘Tiaowen’)为父本,进行人工杂交选育出的喇叭型优良朱顶红新品种。花单瓣,主色橘红色,中部和边缘黄绿色,喉部绿色。花径14.6 cm,深14.2 cm,花葶平均长48.2 cm;平均叶长18.5 cm,最大叶宽4.2 cm。适宜家庭室内、温室大棚设施栽培。展开更多
基金funded by Guangdong Basic and Applied Basic Research Foundation (Grant No.2023A1515010237)the 2021 Dongguan Provincial Rural Revitalization Program (Grant No.20211800400022)+2 种基金the Guangdong Key Technology Research and Development Program (Grant Nos.2020B020220005,2022B1111040003)the Guangdong Modern Agricultural Industry Technology System Program (Grant No.2023KJ121)the South China Botanical Garden,the Chinese Academy of Sciences (Grant No.QNXM-02)。
文摘Hippeastrum, a highly diverse genus in the Amaryllidaceae family, is a valuable ornamental bulbous flowering plant. Somatic embryogenesis(SE) is an efficient method for mass production of Hippeastrum plantlets. Previous studies have been devoted to the in vitro propagation of Hippeastrum, but the SE and its regulatory networks are rarely reported. In this study, we established a direct SE method of Hippeastrum Bangkok Rose' using leaf bases as explants. MS supplemented with 1.00 mg·L^(-1)NAA +1.00 mg·L^(-1)KT + 0.25 mg·L^(-1)TDZ was the optimal medium for SE. Histological observations showed that the bipolar somatic embryo originated from the epidermal cell layer and underwent initiation,globular, scutellar and coleoptile stages. During SE, endogenous hormones of IAA, CTK, ABA, and SA were highly accumulated. Transcriptomic analysis revealed the genes encoding auxin biosynthesis/metabolic enzymes and efflux carriers were induced, while the auxin receptor of TIR1 and ARF transcriptional repressor of Aux/IAA were down-regulated and up-regulated, respectively, leading to suppression of auxin signaling. In contrast, cytokine signaling was promoted at the early stage of SE, as biosynthesis, transport, and signaling components were up-regulated.Various stress-related genes were up-regulated at the early or late stages of SE. Chromatin remodeling could also be dynamically regulated via distinct expression enzymes that control histone methylation and acetylation during SE. Moreover, key SE regulators, including WOXs and SERKs were highly expressed along with SE. Overall, the present study provides insights into the SE regulatory mechanisms of the Hippeastrum.
文摘‘包美1号’(Hippeastrum‘Bao Mei Yi Hao’)是以‘日耳曼’(H.parodii‘Germa’)为母本,自育品种‘条纹’(‘Tiaowen’)为父本,进行人工杂交选育出的喇叭型优良朱顶红新品种。花单瓣,主色橘红色,中部和边缘黄绿色,喉部绿色。花径14.6 cm,深14.2 cm,花葶平均长48.2 cm;平均叶长18.5 cm,最大叶宽4.2 cm。适宜家庭室内、温室大棚设施栽培。
