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Expression Analysis of Genes Related to Auxin Metabolism at Different Growth Stages of Pak Choi

Horticultural Plant Journal 2020年第1期6卷 25-33页

作者： Yuxiang Hou Xueting Wang Zhujun Zhu Mengxia Sun Meilan Li Leiping Hou collaborative innovation center for improving quality and increasing profits of protected vegetables College of HorticultureShanxi Agricultural UniversityTaiguShanxi 030801China Key Laboratory for quality Improvement of Agricultural Products of Zhejiang Province/College of Agricultural and Food Science Zhejiang A&F UniversityHangzhou 311300China

Pak choi is a low-temperature vernalized plant that readily undergoes premature bolting during spring, but little is known about the governing molecular regulation of vernalization. In order to enhance our understanding of mechanism about premature bolting, we discussed the relationship between auxin(indole-3-acetic acid, IAA) and flowering of pak choi. During vernalization, hormone metabolism is an important regulatory pathway, and IAA plays a specific role. IAA metabolism has been studied in Arabidopsis thaliana and other plants, but not in pak choi. In this paper, the IAA content in pak choi shoot apices during vernalization and different growth stages was compared. The IAA content decreased significantly after low-temperature treatment(4 °C) and then increased rapidly during vegetative growth. During floral bud initiation,the IAA content decreased rapidly and was the lowest. Expressions of genes encoding key IAA metabolic enzymes were analyzed, and a major synthetase-encoding gene was downregulated, while a key degrading enzyme-encoding gene was upregulated during each comparison period,resulting in decreased IAA content. Expressions of four genes(Bra034975, Bra030246, Bra012239 and Bra040296) were consistent with changes in the IAA content. The functions of differentially expressed genes(DEGs) were analyzed, and 15 DEGs were found to be related to IAA *** findings illuminated the molecular mechanism regulating IAA content during vernalization in pak choi.

关键词： Pak choi Brassica rapa Vernalization Auxins Gene expression Hormone metabolism

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AgMYB1,an R2R3-MYB factor,plays a role in anthocyanin production and enhancement of antioxidant capacity in celery

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Vegetable Research 2021年第1期1卷 2-13页

作者： Kai Feng Guo-Ming Xing Jie-Xia Liu Hao Wang Guo-Fei Tan Guang-Long Wang Zhi-Sheng Xu Ai-Sheng Xiong State Key Laboratory of Crop Genetics and Germplasm Enhancement Ministry of Agriculture and Rural Affairs Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in East ChinaCollege of HorticultureNanjing Agricultural University1 WeigangNanjing 210095China collaborative innovation center for improving quality and Increase profits of protected vegetables in Shanxi Shanxi Agricultural UniversityTaigu 030801China Institute of Horticulture Guizhou Academy of Agricultural SciencesGuiyang 550006China School of Life Science and Food Engineering Huaiyin Institute of TechnologyHuaian 223001China College of Horticulture and Plant Protection Yangzhou UniversityYangzhou 225009China

Celery is rich in nutrients and cultivated *** are natural plant pigments with high antioxidant capabilities in the human *** accumulation of anthocyanins in celery results in the purple skin color of ***,an R2R3-MYB transcription factor(TFs),AgMYB1,was cloned from purple-skin *** analysis revealed that AgMYB1 belongs to the anthocyanin *** alignment showed that AgMYB1 contains multiple anthocyanin-related *** with the activating role in anthocyanin production,AgMYB1 showed higher transcriptions in purple celery compared with non-purple *** expression of AgMYB1 in tobacco leaves promoted the accumulation of anthocyanins and produced red pigments in *** expression of AgMYB1 in Arabidopsis activates anthocyanin production and generates dark-purple *** enhancement of anthocyanin biosynthetic genes transcripts and glycosylation capacities in transgenic Arabidopsis verified the activating roles of AgMYB1 at the gene and protein level,*** antioxidant capacity of transgenic Arabidopsis was also increased compared to wild type ***,yeast two-hybrid assay proved that AgMYB1 interacted with bHLH TFs to regulate anthocyanin *** results show that the overexpression of single R2R3-MYB gene,AgMYB1,without coexpression of other TFs,can improve anthocyanin production and antioxidant capacity in transgenic *** study presents new information for anthocyanin regulatory mechanisms in purple celery and provides a strategy for cultivating plants with high levels of anthocyanins.

关键词： anthocyanin purple branch

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