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- W4223965645 abstract "Abstract Finetuning the progression of leaf senescence is important for plant’s fitness in nature, while ‘staygreen’ with delayed leaf senescence has been considered as a valuable agronomic trait in crop genetic improvement. In this study, a switchgrass CCCH-type Zinc finger gene, PvC3H29 , was characterized as a suppressor of leaf senescence that over-expressing or suppressing the gene led to delayed or accelerated leaf senescence, respectively. Transcriptomic analysis marked that chlorophyll catabolic pathway genes were involved in the PvC3H29-regulated leaf senescence. PvC3H29 was a nucleus-localized protein with no transcriptional activity. By Y2H screening, we identified its interacting proteins, including a pair of paralogous transcription factors, PvNAP1&2. Over-expressing the PvNAPs led to precocious leaf senescence at least partially by directly targeting and transactivating chlorophyll catabolic genes to promote chlorophyll degradation. PvC3H29, through protein-protein interaction, repressed the DNA-binding efficiency of PvNAPs and alleviated its transactivating effect on downstream genes, thereby functioned as a ‘brake’ in the progression of leaf senescence. Moreover, over-expressing PvC3H29 resulted in up to 47% higher biomass yield and improved biomass feedstock quality, reiterating the importance of leaf senescence regulation in the genetic improvement of switchgrass and other feedstock crops. One-sentence summary PvC3H29 interacts with transcription factors, PvNAP1&2, to inhibit their transactivation on chlorophyll catabolism and leaf senescence in switchgrass." @default.
- W4223965645 created "2022-04-19" @default.
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- W4223965645 date "2022-04-15" @default.
- W4223965645 modified "2023-10-16" @default.
- W4223965645 title "PvC3H29 interacts with and inhibits DNA binding of PvNAPs to finetune leaf senescence in switchgrass (<i>Panicum virgatum</i>)" @default.
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- W4223965645 doi "https://doi.org/10.1101/2022.04.14.488389" @default.
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