Ectopic Expression of a Transmembrane Protein KaCyt b6 from a Red Seaweed Kappaphycus alvarezii in Transgenic Tobacco Augmented the Photosynthesis and Growth.

IF 2.6 4区 生物学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
DNA and cell biology Pub Date : 2024-12-01 Epub Date: 2020-08-31 DOI:10.1089/dna.2020.5479
Sweta K Yadav, Kusum Khatri, Mangal S Rathore, Bhavanath Jha
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引用次数: 0

Abstract

Cytochrome b6f complex is a thylakoid membrane-localized protein and catalyses the transfer of electrons from plastoquinol to plastocyanin in photosynthetic electron transport chain. In the present study, Cytochrome b6 (KaCyt b6) gene from Kappaphycus alvarezii (a red seaweed) was overexpressed in tobacco. A 935 base pair (bp) long KaCyt b6 cDNA contained an open reading frame of 648 bp encoding a protein of 215 amino acids with an expected isoelectric point of 8.67 and a molecular mass of 24.37 kDa. The KaCyt b6 gene was overexpressed in tobacco under control of CaMV35S promoter. The transgenic tobacco had higher electron transfer rate and photosynthetic yield over wild-type and vector control tobacco. The KaCyt b6 tobacco also exhibited significantly higher photosynthetic gas exchange (PN) and improved water use efficiency. The transgenic plants had higher ratio of PN and intercellular CO2. The KaCyt b6 transgenic tobacco showed higher estimates of photosystem II quantum yield, higher activity of the water-splitting complex, PSII photochemistry, and photochemical quenching. The basal quantum yield of nonphotochemical processes in PSII was recorded lower in KaCyt b6 tobacco. Transgenic tobacco contained higher contents of carotenoids and total chlorophyll and also had better ratios of chlorophyll a and b, and carotenoids and total chlorophyll contents hence improved photosynthetic efficiency and production of sugar and starch. The KaCyt b6 transgenic plants performed superior under control and greenhouse conditions. To the best of our knowledge through literature survey, this is the first report on characterization of KaCyt b6 gene from K. alvarezii for enhanced photosynthetic efficiency and growth in tobacco.

在转基因烟草中异位表达来自红藻 Kappaphycus alvarezii 的跨膜蛋白 KaCyt b6 可增强光合作用和生长。
细胞色素 b6f 复合物是一种定位在类色素膜上的蛋白质,在光合电子传递链中催化电子从质体醌转移到质体花青素。本研究在烟草中过表达了来自红藻(Kappaphycus alvarezii)的细胞色素 b6(KaCyt b6)基因。935 碱基对(bp)长的 KaCyt b6 cDNA 包含一个 648 bp 的开放阅读框,编码 215 个氨基酸的蛋白质,预期等电点为 8.67,分子质量为 24.37 kDa。在 CaMV35S 启动子的控制下,KaCyt b6 基因在烟草中过表达。与野生型和载体对照烟草相比,转基因烟草具有更高的电子传递速率和光合产量。KaCyt b6烟草的光合气体交换量(PN)也明显增加,水分利用效率提高。转基因植株的 PN 和细胞间 CO2 比率更高。KaCyt b6 转基因烟草表现出更高的光系统 II 量子产率、更高的水分分离复合物活性、PSII 光化学反应和光化学淬灭。在 KaCyt b6 烟草中,PSII 非光化学过程的基础量子产率较低。转基因烟草的类胡萝卜素和总叶绿素含量较高,叶绿素 a 和叶绿素 b、类胡萝卜素和总叶绿素含量的比例也较高,因此光合效率和糖及淀粉的产量都有所提高。在对照和温室条件下,KaCyt b6 转基因植物的表现更优越。据我们通过文献调查所知,这是首次报道 K. alvarezii 的 KaCyt b6 基因在提高烟草光合效率和生长方面的特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
DNA and cell biology
DNA and cell biology 生物-生化与分子生物学
CiteScore
6.60
自引率
0.00%
发文量
93
审稿时长
1.5 months
期刊介绍: DNA and Cell Biology delivers authoritative, peer-reviewed research on all aspects of molecular and cellular biology, with a unique focus on combining mechanistic and clinical studies to drive the field forward. DNA and Cell Biology coverage includes: Gene Structure, Function, and Regulation Gene regulation Molecular mechanisms of cell activation Mechanisms of transcriptional, translational, or epigenetic control of gene expression Molecular Medicine Molecular pathogenesis Genetic approaches to cancer and autoimmune diseases Translational studies in cell and molecular biology Cellular Organelles Autophagy Apoptosis P bodies Peroxisosomes Protein Biosynthesis and Degradation Regulation of protein synthesis Post-translational modifications Control of degradation Cell-Autonomous Inflammation and Host Cell Response to Infection Responses to cytokines and other physiological mediators Evasive pathways of pathogens.
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