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Differential and reciprocal regulation of ethylene pathway genes regulates petal abscission in fragrant and non-fragrant roses

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Title Differential and reciprocal regulation of ethylene pathway genes regulates petal abscission in fragrant and non-fragrant roses
 
Creator Singh, Priya
Singh, Amar Pal
Sane, Aniruddha P.
 
Subject Ethylene signalling
Petal
Senescence
Cell separation
Flower
Vase-life
 
Description Accepted date: 14 December 2018
The fragrant rose, Rosa bourboniana, is highly sensitive to ethylene and shows rapid petal abscission (within 16-18 h) while the non-fragrant hybrid rose, R. hybrida, shows delayed abscission (50-52 h) due to reduced ethylene sensitivity. To understand the molecular basis governing these differences, all components of the ethylene pathway (biosynthesis/receptor/signalling) were studied for expression during abscission. Transcript accumulation of most ethylene biosynthesis genes (ACS/ACO families) increased rapidly in petal abscission zones of R. bourboniana within 4-8 h of ethylene treatment. The expression of most receptor and signalling genes encoding CTRs, EIN2 and EIN3/EIL homologues also followed similar kinetics. Under natural field conditions where abscission takes longer, there was a temporal delay in transcript accumulation of most ethylene pathway genes while some biosynthesis genes (showing reduced ethylene sensitivity) were more strongly up-regulated by abscission cues. In contrast, in R. hybrida where even ethylene-induced abscission is considerably delayed, transcript accumulation of most ethylene biosynthesis and signalling genes was, surprisingly, reduced by ethylene and showed an opposite regulation compared to R. bourboniana. The results suggest that differential and reciprocal regulation of ethylene pathway is one of the major reasons for differences in petal abscission and vase-life between Rosa bourboniana and R. hybrida.
We thank the Council of Scientific and Industrial Research (Govt of
India) for Senior Research Fellowships to PS and APS and for financial
support to APS (under BSC0107) for the work. We are grateful to Mr
Ram Awadh for taking care of the rose plants.
 
Date 2019-03-29T06:09:54Z
2019-03-29T06:09:54Z
2019
 
Type Article
 
Identifier Plant Science, 280: 330-339
0168-9452
http://223.31.159.10:8080/jspui/handle/123456789/936
https://www.sciencedirect.com/science/article/pii/S0168945218311725?via%3Dihub
https://doi.org/10.1016/j.plantsci.2018.12.013
 
Language en_US
 
Format application/pdf
 
Publisher Elsevier B.V.