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Molecular Evidences for the Interactions of Auxin, Gibberellin, and Cytokinin in Bent Peduncle Phenomenon in Rose (Rosa sp.)

1
Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing 100193, China
2
School of Applied Chemistry and Biotechnology, Shenzhen Polytechnic, Shenzhen 518055, China
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(4), 1360; https://doi.org/10.3390/ijms21041360
Received: 18 December 2019 / Revised: 8 February 2020 / Accepted: 14 February 2020 / Published: 18 February 2020
(This article belongs to the Section Molecular Plant Sciences)
In roses (Rosa sp.), peduncle morphology is an important ornamental feature. The common physiological abnormality known as the bent peduncle phenomenon (BPP) seriously decreases the quality of rose flowers and thus the commercial value. Because the molecular mechanisms underlying this condition are poorly understood, we analysed the transcriptional profiles and cellular structures of bent rose peduncles. Numerous differentially expressed genes involved in the auxin, cytokinin, and gibberellin signaling pathways were shown to be associated with bent peduncle. Paraffin sections showed that the cell number on the upper sides of bent peduncles was increased, while the cells on the lower sides were larger than those in normal peduncles. We also investigated the large, deformed sepals that usually accompany BPP and found increased expression level of some auxin-responsive genes and decreased expression level of genes that are involved in cytokinin and gibberellin synthesis in these sepals. Furthermore, removal of the deformed sepals partially relieved BPP. In summary, our findings suggest that auxin, cytokinin, and gibberellin all influence the development of BPP by regulating cell division and expansion. To effectively reduce BPP in roses, more efforts need to be devoted to the molecular regulation of gibberellins and cytokinins in addition to that of auxin. View Full-Text
Keywords: auxin; bent peduncle phenomenon; cytokinin; gibberellin; rose auxin; bent peduncle phenomenon; cytokinin; gibberellin; rose
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MDPI and ACS Style

Jing, W.; Zhang, S.; Fan, Y.; Deng, Y.; Wang, C.; Lu, J.; Sun, X.; Ma, N.; Shahid, M.O.; Li, Y.; Zhou, X. Molecular Evidences for the Interactions of Auxin, Gibberellin, and Cytokinin in Bent Peduncle Phenomenon in Rose (Rosa sp.). Int. J. Mol. Sci. 2020, 21, 1360.

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