SlSGRL, a tomato SGR-like protein, promotes chlorophyll degradation downstream of the ABA signaling pathway

Yang, Minmin; Zhu, Shaobo; Jiao, Baozhen; Duan, Ming; Meng, Qingwei; Ma, Nana; Lv, Wei

doi:10.1016/j.plaphy.2020.10.028

Cited by 32 publications

(19 citation statements)

References 54 publications

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“…It was reported that SGR2 may play negative or positive regulatory roles in Chl degradation during leaf senescence [62,63]. SGRL promotes Chl degradation in different plant species [64][65][66][67]; however, the mechanism needs further investigation.…”

Section: Chl Degradationmentioning

confidence: 99%

Research Progress in the Interconversion, Turnover and Degradation of Chlorophyll

Khan

et al. 2021

Cells

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Chlorophylls (Chls, Chl a and Chl b) are tetrapyrrole molecules essential for photosynthetic light harvesting and energy transduction in plants. Once formed, Chls are noncovalently bound to photosynthetic proteins on the thylakoid membrane. In contrast, they are dismantled from photosystems in response to environmental changes or developmental processes; thus, they undergo interconversion, turnover, and degradation. In the last twenty years, fruitful research progress has been achieved on these Chl metabolic processes. The discovery of new metabolic pathways has been accompanied by the identification of enzymes associated with biochemical steps. This article reviews recent progress in the analysis of the Chl cycle, turnover and degradation pathways and the involved enzymes. In addition, open questions regarding these pathways that require further investigation are also suggested.

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Section: Chl Degradationmentioning

confidence: 99%

Research Progress in the Interconversion, Turnover and Degradation of Chlorophyll

Khan

et al. 2021

Cells

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“…At the same time, dark-induced stress can also cause chlorophyll degradation, accompanied by changes in chlorophyll-degradation gene expression. Previous studies have confirmed that SAG113 , SAG12, and NAP2 are upregulated during leaf senescence [ 50 , 51 ], and SGR1 , PPH , PAO , NOL , and NYC1 are upregulated act as chlorophyll-degradation inducing genes [ 52 , 53 , 54 ]. In our study, during darkness, the expression levels of chloroplast degradation-related genes and leaf senescence-related genes in BAG-overexpressing plants were also significantly lower than those in WT plants ( Figure 12 ).…”

Section: Discussionmentioning

confidence: 86%

Characterization of SlBAG Genes from Solanum lycopersicum and Its Function in Response to Dark-Induced Leaf Senescence

Wang

Jahan

et al. 2021

Plants

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The Bcl-2-associated athanogene (BAG) family is a group of evolutionarily conserved cochaperones involved in diverse cellular functions. Here, ten putative SlBAG genes were identified in tomato. SlBAG2 and SlBAG5b have the same gene structure and conserved domains, along with highly similar identity to their homologs in Arabidopsis thaliana, Oryza sativa, and Triticum aestivum. The qPCR data showed that BAG2 and BAG5b were highly expressed in stems and flowers. Moreover, both genes were differentially expressed under diverse abiotic stimuli, including cold stress, heat stress, salt treatment, and UV irradiation, and treatments with phytohormones, namely, ABA, SA, MeJA, and ETH. Subcellular localization showed that SlBAG2 and SlBAG5b were located in the cell membrane and nucleus. To elucidate the functions in leaf senescence of BAG2 and BAG5b, the full-length CDSs of BAG2 and BAG5b were cloned, and transgenic tomatoes were developed. Compared with WT plants, those overexpressing BAG2 and BAG5b had significantly increased chlorophyll contents, chlorophyll fluorescence parameters and photosynthetic rates but obviously decreased ROS levels, chlorophyll degradation and leaf senescence related gene expression under dark stress. Conclusively, overexpression SlBAG2 and SlBAG5b could improve the tolerance of tomato leaves to dark stress and delay leaf senescence.

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“…It has been shown that ABA promotes the degradation of chlorophyll and causes the yellowing of leaves [ 27 ]. Here, we treated cut ‘Lv Dingdang’ flowers with 20 mg/L ABA and examined the expression of chlorophyll synthesis-related genes.…”

Section: Resultsmentioning

confidence: 99%

CmNAC73 Mediates the Formation of Green Color in Chrysanthemum Flowers by Directly Activating the Expression of Chlorophyll Biosynthesis Genes HEMA1 and CRD1

Jia

Wang

Chen

et al. 2021

Genes

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Chrysanthemum is one of the most beautiful and popular flowers in the world, and the flower color is an important ornamental trait of chrysanthemum. Compared with other flower colors, green flowers are relatively rare. The formation of green flower color is attributed to the accumulation of chlorophyll; however, the regulatory mechanism of chlorophyll metabolism in chrysanthemum with green flowers remains largely unknown. In this study, we performed Illumina RNA sequencing on three chrysanthemum materials, Chrysanthemum vestitum and Chrysanthemum morifolium cultivars ‘Chunxiao’ and ‘Green anna,’ which produce white, light green and dark green flowers, respectively. Based on the results of comparative transcriptome analysis, a gene encoding a novel NAC family transcription factor, CmNAC73, was found to be highly correlated to chlorophyll accumulation in the outer whorl of ray florets in chrysanthemum. The results of transient overexpression in chrysanthemum leaves showed that CmNAC73 acts as a positive regulator of chlorophyll biosynthesis. Furthermore, transactivation and yeast one-hybrid assays indicated that CmNAC73 directly binds to the promoters of chlorophyll synthesis-related genes HEMA1 and CRD1. Thus, this study uncovers the transcriptional regulation of chlorophyll synthesis-related genes HEMA1 and CRD1 by CmNAC73 and provides new insights into the development of green flower color in chrysanthemum and chlorophyll metabolism in plants.

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SlSGRL, a tomato SGR-like protein, promotes chlorophyll degradation downstream of the ABA signaling pathway

Cited by 32 publications

References 54 publications

Research Progress in the Interconversion, Turnover and Degradation of Chlorophyll

Research Progress in the Interconversion, Turnover and Degradation of Chlorophyll

Characterization of SlBAG Genes from Solanum lycopersicum and Its Function in Response to Dark-Induced Leaf Senescence

CmNAC73 Mediates the Formation of Green Color in Chrysanthemum Flowers by Directly Activating the Expression of Chlorophyll Biosynthesis Genes HEMA1 and CRD1

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