scholarly journals The Decreased apical dominance1/Petunia hybrida CAROTENOID CLEAVAGE DIOXYGENASE8 Gene Affects Branch Production and Plays a Role in Leaf Senescence, Root Growth, and Flower Development

2005 ◽  
Vol 17 (3) ◽  
pp. 746-759 ◽  
Author(s):  
Kimberley C. Snowden ◽  
Andrew J. Simkin ◽  
Bart J. Janssen ◽  
Kerry R. Templeton ◽  
Holly M. Loucas ◽  
...  
Keyword(s):  
Root Growth ◽  
Leaf Senescence ◽  
Flower Development ◽  
Petunia Hybrida

scholarly journals Validation of reference genes for quantitative real-time PCR during leaf and flower development in Petunia hybrida

2010 ◽  
Vol 10 (1) ◽  
pp. 4 ◽  
Author(s):  
Izaskun Mallona ◽  
Sandra Lischewski ◽  
Julia Weiss ◽  
Bettina Hause ◽  
Marcos Egea-Cortines
Keyword(s):  
Real Time ◽  
Real Time Pcr ◽  
Flower Development ◽  
Reference Genes ◽  
Petunia Hybrida ◽  
Quantitative Real Time Pcr

scholarly journals Identification of WRKY transcription factors associated with leaf and corolla senescence in Petunia hybrida

2021 ◽  
Author(s):  
Francisco Horacio Astigueta ◽  
Amilcar Hernán Baigorria ◽  
Martín Nahuel García ◽  
Verónica Cecilia Delfosse ◽  
Sergio Alberto González ◽  
...  
Keyword(s):  
Transcription Factors ◽  
Leaf Senescence ◽  
Petunia Hybrida ◽  
Expression Profiles ◽  
Regulatory Element ◽  
Expression Data ◽  
Age Related ◽  
Weak Expression ◽  
Natural Leaf ◽  
Simultaneous Visualization

Abstract Several families of transcription factors (TFs) control the progression of senescence. Many key TFs belonging to the WRKY family have been described to play crucial roles in the regulation of leaf senescence, mainly in Arabidopsis. However, little is known about senescence-associated WRKY members in floricultural species. Delay of senescence in leaves and petals of Petunia hybrida, a worldwide ornamental crop are highly appreciated traits. In this work, starting from 28 differentially expressed WRKY genes of Arabidopsis during the progression of leaf senescence, we identified the orthologous in P. hybrida and explored the expression profiles of 20 PhWRKY genes during the progression of natural (age-related) leaf and corolla senescence as well as in the corollas of flowers undergoing pollination-induced senescence. Simultaneous visualization showed consistent and similar expression profiles of PhWRKYs during natural leaf and corolla senescence, although weak expression changes were observed during pollination-induced senescence. Comparable expression trends between PhWRKYs and the corresponding genes of Arabidopsis were observed during leaf senescence, although more divergences were found in petals of pollinated petunia flowers. Integration of expression data with phylogenetics, conserved motif and cis-regulatory element analyses were used to establish a list of solid candidates that could regulate more than one senescence process. Our results suggest that several members of the WRKY family of TFs are tightly linked to the regulation of senescence in P. hybrida.

scholarly journals The Duplicated B-Class Heterodimer Model: Whorl-Specific Effects and Complex Genetic Interactions in Petunia hybrida Flower Development

2004 ◽  
Vol 16 (3) ◽  
pp. 741-754 ◽  
Author(s):  
Michiel Vandenbussche ◽  
Jan Zethof ◽  
Stefan Royaert ◽  
Koen Weterings ◽  
Tom Gerats
Keyword(s):  
Flower Development ◽  
Petunia Hybrida ◽  
Genetic Interactions ◽  
Specific Effects

scholarly journals Effects of SAG12-ipt and HSP18.2-ipt Expression on Cytokinin Production, Root Growth, and Leaf Senescence in Creeping Bentgrass Exposed to Drought Stress

2010 ◽  
Vol 135 (3) ◽  
pp. 230-239 ◽  
Author(s):  
Emily B. Merewitz ◽  
Thomas Gianfagna ◽  
Bingru Huang
Keyword(s):  
Drought Stress ◽  
Root Growth ◽  
Leaf Senescence ◽  
Photochemical Efficiency ◽  
Creeping Bentgrass ◽  
Growth Responses ◽  
Turf Quality ◽  
Relative Water ◽  
Transgenic Lines ◽  
Leaf Relative Water Content

Drought stress is a widespread abiotic stress that causes a decline in plant growth. Drought injury symptoms have been associated with an inhibition in cytokinin (CK) synthesis. The objectives of this study were to investigate whether expression of a gene (ipt) encoding the enzyme adenine isopentenyl phosphotransferase for CK synthesis ligated to a senescence-activated promoter (SAG12) or a heat shock promoter (HSP18.2) would improve drought tolerance in creeping bentgrass (Agrostis stolonifera) and to examine shoot and root growth responses to drought stress associated with changes in endogenous production of CK, and the proportional change in CK and abscisic acid (ABA) due to ipt transformation. Most SAG12-ipt and HSP18.2-ipt transgenic lines exhibited significantly higher turf quality, photochemical efficiency, chlorophyll content, leaf relative water content, and root:shoot ratio under drought stress than the null transformant or the wild-type ‘Penncross’ plants. Transgenic lines that had better growth and turf performance generally had higher CK content and a higher CK-to-ABA ratio, although the direct correlation of CK and ABA content with individual physiological parameters in individual lines was not clear. Our results demonstrated that expressing ipt resulted in the improvement of turf performance under drought stress in creeping bentgrass in some of the transgenic plants with SAG12-ipt or HSP18.2-ipt, which could be associated with the suppression of leaf senescence and promoting root growth relative to shoot growth due to the maintenance of higher CK level and a higher ratio of CK to ABA.

Molecular Control of Flower Development in Petunia hybrida

1997 ◽  
pp. 229-250 ◽  
Author(s):  
Lucia Colombo ◽  
Arjen J. van Tunen ◽  
Hans J.M. Dons ◽  
Gerco C. Angenent
Keyword(s):  
Flower Development ◽  
Petunia Hybrida ◽  
Molecular Control

Increased Maize Plant Population Induced Leaf Senescence, Suppressed Root Growth, Nitrogen Uptake, and Grain Yield

2019 ◽  
Vol 111 (4) ◽  
pp. 1581-1591 ◽  
Author(s):  
Rongfa Li ◽  
Peng Liu ◽  
Shuting Dong ◽  
Jiwang Zhang ◽  
Bin Zhao
Keyword(s):  
Root Growth ◽  
Grain Yield ◽  
Leaf Senescence ◽  
Nitrogen Uptake ◽  
Plant Population ◽  
Maize Plant

scholarly journals Investigation Of Best Potting Media To Enhance Flowering Performance Of Petunia Hybrida

2020 ◽  
Vol 3 (2) ◽  
pp. 1-6
Author(s):  
Madurangani HGAMP ◽  
Keyword(s):  
Root Growth ◽  
Vegetative Growth ◽  
Petunia Hybrida ◽  
Small Volume ◽  
Ornamental Plants ◽  
Botanical Garden ◽  
Potted Plants ◽  
Potting Media ◽  
Quality Production

Petunia hybrida is a worldwide most popular annual bedding ornamental plants and economically profitable potted plants. Potting media is most important factor which plays a key role of root growth, vegetative growth and quality production dependent on a relatively small volume of the medium. Hence present study was conducted to evaluate the best potting media to enhance flowering performance of Petunia hybrida. The experiment was conducted at the plant house located at botanical garden, Gampaha by using Petunia variety of F1 multi. Fenice.

scholarly journals 469 Multi-faceted Approaches to Genetic Engineering of Petunia × hybrida for Delayed Leaf Senescence

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 474F-475
Author(s):  
David G. Clark ◽  
Chris Dervinis ◽  
Francine Cuquel ◽  
Harry Klee ◽  
Jim Barrett ◽  
...  
Keyword(s):  
Leaf Senescence ◽  
Petunia Hybrida ◽  
Root Formation ◽  
Isopentenyl Transferase ◽  
Morphological Alterations ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Rate Limiting ◽  
Senescence Associated Genes ◽  
Transgenic Petunia

In an effort to modify and study leaf senescence, we have produced several different transgenic petunia lines with altered leaf senescence phenotypes. Using two promoters from senescence-associated genes (sag12 & sag13) fused to the isopentenyl transferase (IPT) gene, which catalyzes the rate-limiting step of cytokinin production, we have produced transgenic petunia plants with delayed lower leaf senescence. We have observed that apparent “leaky” expression of IPT gives rise to plants with other morphological alterations such as increased branching habit and decreased root formation. Plants with delayed leaf senescence phenotypes were selected and bred to produce progeny that were evaluated in greenhouse experiments. Breeding characteristics, horticultural performance and reproduction of these plants will be discussed in terms of potential commercial benefits and limitations. Using the sag12 promoter to drive expression of the knotted (KN1) gene, we have also been able to engineer petunia plants with delayed lower leaf senescence. Initial progeny evaluations of sag12-KN1 petunias will also be discussed.

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