Search results
Revision notes on 15.2.2 The Role of Auxin in Elongation Growth for the CIE A Level Biology syllabus, written by the Biology experts at Save My Exams.
Auxins control the growth of plants by promoting cell division and causing elongation in plant cells (the cells get longer).
Auxins change the rates of elongation in plant cells and control growth of stems and roots. Stems and roots respond differently to high concentrations of auxins: cells in stems grow more. cells...
Plant rejuvenation refers to the reversal of the adult phase in plants and the recovery of part or all of juvenile plant characteristics. The growth and reproductive vitality of plants can be increased after rejuvenation.
- Zijie Zhang, Yuhan Sun, Yun Li
- 2020
- Specific DNA Elements Confer Auxin Responsiveness to Early Gene Promoters
- Composite Auxres Are Found in auxin-responsive Promoters
- Simple Elements Also Function as Auxres
- Tgtctc Auxres Have Similarities to Animal Hres
- Arfs Are Transcription Factors That Target Tgtctc Auxres
- Arabidopsis Contains A Family of ARF Transcription Factors
- Abbreviations
Only a few primary auxin-responsive gene promoters have been analyzed forcis-acting elements that confer auxin responsiveness. The most extensively studied auxin-responsive plant gene promoters are those from the pea PS-IAA4/5 gene (Ballas et al., 1993,1995), the soybean GH3 gene (Liu et al., 1994, 1997; Ulmasov et al., 1995), and the soybean SAUR1...
The structures of naturally occurring composite AuxREs suggest that they might function with a variety of different constitutive or coupling elements. Composite AuxREs could potentially confer a wide range of tissue-specific and developmentally regulated expression patterns, depending on the nature of the constitutive or coupling element that funct...
Results with the natural AuxREs in the soybean GH3promoter indicated that the TGTCTC element required a closely associated constitutive or coupling element to function as an AuxRE. The question remained, however, whether the TGTCTC element had intrinsic AuxRE activity if it was multimerized with appropriate spacing between TGTCTC repeats. Recent ex...
Some similarities between plant TGTCTC AuxREs and animal GREs or steroid HREs have been described previously (Ulmasov et al., 1997a;Guilfoyle et al., 1998). First, the TGTCTC AuxRE is similar in size and sequence to the GRE half-site TGTTCT. Second, both AuxREs and GREs or HREs may take the form of composite elements. For example, a composite GRE m...
Because simple TGTCTC AuxREs that display greater AuxRE activity than natural AuxREs can be designed, they have proven advantageous for identifying and cloning transcription factors involved in auxin-responsive gene expression. A highly active palindromic repeat of the TGTCTC element was used as bait in a yeast one-hybrid system along with an Arabi...
ARF1 represents one member of a family of proteins containing a highly conserved aminoterminal DNA-binding domain and a carboxyterminal domain related to domains III and IV in the Aux/IAA proteins. A total of nine full-length Arabidopsis cDNA clones encoding ARF proteins have been identified to date (Guilfoyle et al., 1998). The ARF proteins range ...
ARF1auxin response factor 1AuxREauxin response elementsGREglucocorticoid response elementHREhormone response element- Tom Guilfoyle, Gretchen Hagen, Tim Ulmasov, Jane Murfett
- 1998
Learn how plants release hormones that are vital for their correct growth and development and the ways these help them to respond to the environment.
People also ask
What is plant rejuvenation?
What causes unequal growth rates in plants and shoots?
Can rejuvenation increase growth and reproductive vitality of plants?
What morphological and macromolecular changes occur during plant rejuvenation?
How can plants be rejuvenated?
How do juvenile plants regain their juvenile characteristics?
Undifferentiated stem cells in plants function as a reservoir of new cells from which the plant can grow and develop specialised tissues. New stems, new leaves, new roots and new flowers...
