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| 1 | 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 |
| 2 | 红芪颜色与类胡萝卜素类成分的相关性研究显示文摘采用精密色差仪获取红芪的颜色值数据,应用液相色谱串联质谱(LC-MS/MS)测定红芪中类胡萝卜素类代谢产物的含量,并采用单因素方差分析、PCA分析、聚类分析、相关性分析、OPLS-DA分析等方法,研究红芪颜色与类胡萝卜素类成分的相关性。结果显示,红芪中有17种类胡萝卜素类成分被检出;棕黄色、红棕色、红褐色与黄棕色红芪样品间颜色值具有显著差异性;红芪颜色值与类胡萝卜素类代谢产物含量间存在关联关系,4种颜色样品间17种类胡萝卜素类成分含量存在极大值与极小值的特征,含量分布具有差异性;4种颜色间的差异性代谢产物有2类(胡萝卜素类与叶黄素类)11种,分别为α-胡萝卜素、β-胡萝卜素、叶黄素二月桂酸酯、叶黄素二肉豆蔻酸酯、紫黄质二丁酸酯、紫黄质肉豆蔻酸酯、花药黄质、玉米黄质、紫黄质、叶黄素、β-隐黄质月桂酸,其是红芪产生颜色的呈色物质之一。棕黄色、红棕色、红褐色与黄棕色红芪样品的呈色原因可能与类胡萝卜素类代谢产物的含量及种类有关。 | 王燕 强正泽 李成义 贾妙婷 魏小成 王明伟 李硕 | 2023 | 天然产物研究与开发2023，35，10： | 0 |
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