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| 1 | An apple (Malus domestica) AP2/ERF transcription factor modulates carotenoid accumulation显示文摘Color is an important trait for horticultural crops.Carotenoids are one of the main pigments for coloration and have important implications for photosynthesis in plants and benefits for human health.Here,we identified an APETALA2(AP2)/ETHYLENE RESPONSE FACTOR(ERF)transcription factor named MdAP2-34 in apple(Malus domestica Borkh.).MdAP2-34 expression exhibited a close correlation with carotenoid content in‘Benin Shogun’and‘Yanfu 3’fruit flesh.MdAP2-34 promotes carotenoid accumulation in MdAP2-34-OVX transgenic apple calli and fruits by participating in the carotenoid biosynthesis pathway.The major carotenoid contents of phytoene andβ-carotene were much higher in overexpressing MdAP2-34 transgenic calli and fruit skin,yet the predominant compound of lutein showed no obvious difference,indicating that MdAP2-34 regulates phytoene andβ-carotene accumulation but not lutein.MdPSY2-1(phytoene synthase 2)is a major gene in the carotenoid biosynthesis pathway in apple fruit,and the MdPSY2-1 gene is directly bound and transcriptionally activated by MdAP2-34.In addition,overexpressing MdPSY2-1 in apple calli mainly increases phytoene and total carotenoid contents.Our findings will advance and extend our understanding of the complex molecular mechanisms of carotenoid biosynthesis in apple,and this research is valuable for accelerating the apple breeding process. | Qingyuan Dang Haiyun Sha Jiyun Nie Yongzhang Wang Yongbing Yuan Dongjie Jia | 2021 | Horticulture Research2021，8，1： | 3 |
| 2 | 植物观赏器官中类胡萝卜素代谢调控的研究进展显示文摘类胡萝卜素是一类广泛分布于自然界的重要天然色素的总称,对于植物观赏品质的形成具有重要作用。类胡萝卜素代谢途径控制着植物黄色和橙色等颜色的形成,并影响挥发性芳香化合物的合成,进而影响植物观赏器官的色素沉积和香气产生。本文主要就类胡萝卜素代谢途径的分子调控、对植物花、果、叶的色香变化影响及利用基因工程技术对类胡萝卜素的改良等方面进行综述,以期能够更好地揭示类胡萝卜素在植物观赏器官的合成代谢与调控机制,为改良植物重要观赏品质提供帮助。 | 田清尹 岳远征 申慧敏 潘多 杨秀莲 王良桂 | 2022 | 生物技术通报2022，38，12： | 1 |
| 3 | A multi-omics approach identifies bHLH71-like as a positive regulator of yellowing leaf pepper mutants exposed to high-intensity light显示文摘Light quality and intensity can have a significant impact on plant health and crop productivity.Chlorophylls and carotenoids are classes of plant pigments that are responsible for harvesting light energy and protecting plants from the damaging effects of intense light.Our understanding of the role played by plant pigments in light sensitivity has been aided by light-sensitive mutants that change colors upon exposure to light of variable intensity.In this study,we conducted transcriptomic,metabolomic,and hormone analyses on a novel yellowing mutant of pepper(yl1)to shed light on the molecular mechanism that regulates the transition from green to yellow leaves in this mutant upon exposure to high-intensity light.Our results revealed greater accumulation of the carotenoid precursor phytoene and the carotenoids phytofluene,antheraxanthin,and zeaxanthin in yl1 compared with wild-type plants under high light intensity.A transcriptomic analysis confirmed that enzymes involved in zeaxanthin and antheraxanthin biosynthesis were upregulated in yl1 upon exposure to high-intensity light.We also identified a single basic helix–loop–helix(bHLH)transcription factor,bHLH71-like,that was differentially expressed and positively correlated with light intensity in yl1.Silencing of bHLH71-like in pepper plants suppressed the yellowing phenotype and led to reduced accumulation of zeaxanthin and antheraxanthin.We propose that the yellow phenotype of yl1 induced by high light intensity could be caused by an increase in yellow carotenoid pigments,concurrent with a decrease in chlorophyll accumulation.Our results also suggest that bHLH71-like functions as a positive regulator of carotenoid biosynthesis in pepper. | Zhoubin Liu Lianzhen Mao Bozhi Yang Qingzhi Cui Yunhua Dai Xueqiao Li Yisong Chen Xiongze Dai Xuexiao Zou Lijun Ou Sha Yang | 2023 | Horticulture Research2023，10，7： | 0 |
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