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Transcriptome Profile Analysis Reveals the Regulation Mechanism of Pistil Abortion in Handeliodendron bodinieri

ABSTRACT: To elucidate the molecular mechanism of pistils abortion underlying sex differentiation from transcriptomic aspects in Handeliodendron bodinieri, we use abnormal pistils before and after abortion in male flowers and normal pistils in female flowers at the same stage as control material. Key genes regulating pistil abortion was identified by using RNA-seq technique. The results show that it was abortion from the two-nucleate embryo sac to four-nucleate embryo sac at stage one (the diameters of the flower buds were 1.3–1.6 mm), at the same time, 12 genes related to ovule development, such as INO, BEL1, and CRC, 24 genes related to plant hormones, such as AHP6, ARF, ERF, and GID1, and 12 genes related the ROS, such as POD, SOD, CAT and RBOH might be involved in the regulation of pistil abortion. Therefore, this study will provide a theoretical foundation for the conservation, breeding, and application of H. bodinieri in the future.

ORGANISM(S): Handeliodendron bodinieri

PROVIDER: GSE213668 | GEO | 2025/09/19

REPOSITORIES: GEO

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Project description:Gametophytic self-incompatibility is the primary cause of low fruit set in almond. The mechanism of recognition that determines whether the gametophyte is successfully fertilized between pollen tube SCF (F-box-SSK1-Cul1-Rbx1) protein and pistil S-RNase protein during fertilization is unclear. In this study, the pistils of two almond cultivars 'Wanfeng' and 'Nonpareil' were used as the experimental materials after selfing- and nonselfing/cross-pollination, and pistils from the stamen-removed flowers were used as controls. We used fluorescence microscopy to observe the development of pollen tubes after pollination and 4-dimensional label-free quantitation (4D-LFQ) to detect the protein expression profiles of 'Wanfeng' and 'Nonpareil' pistils and in controls. The results showed that it took 24-36 h for the development of the pollen tube to 1/3 of the pistil, and a total of 7684 differentially accumulated proteins (DAPs) were identified in the pistil after pollinating 36 h, of which 7022 were quantifiable. The up- and down-regulation of the 12 differential protein expressions identified by parallel reaction monitoring (PRM) was the same as that identified by 4D-LFQ, with an average fold-change difference of 14.34%, a maximum of 31.37% and a minimum of 3.68%. Bioinformatics analysis based on the function of the differential proteins, including classification, enrichment, and clustering, identified RNA polymerases (4 DAPs), autophagy (3 DAPs), oxidative phosphorylation (3 DAPs), and homologous recombination (2 DAPs) pathways associated with the self-incompatibility process. The interaction between the serine/threonine kinase (MARK2) protein E3 ubiquitin ligase and the microtubule protein component microtubule-associated protein tau (MAPT/ACT) was found using the STRING database, which demonstrated the involvement of the MARK2 protein in the reaction of pollen tube recognition the nonself- and the self-S-RNase protein. It provides a new way to reveal the mechanism by which almond pollen tubes recognize the self and nonself S-RNase enzyme protein.

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Transcriptome Profile Analysis Reveals the Regulation Mechanism of Pistil Abortion in Handeliodendron bodinieri

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