Download presentation
Presentation is loading. Please wait.
1
Gibberellins: Regulators of Plant Height and Seed Germination
GA levels in plants are correlated with stem length. Play role in seed germination, transition to flowering, and pollen development.
2
Figure 20.1 Effect of exogenous GA1 on wild-type and dwarf mutant maize
PP5e-Fig jpg
3
Figure 20.2 Cabbage can be induced to bolt and flower by applications of GA3
PP5e-Fig jpg
4
Figure 20.3 Gibberellins induce conebud formation in juvenile conifers
PP5e-Fig jpg
5
Figure 20.4 Gibberellin induces growth in “Thompson Seedless” grapes
PP5e-Fig jpg
6
Ch. 20 In-Text Art, pp. 585–586 Gibberellin structures
PP5e-ITA-20-p585&586-0.jpg
7
Figure 20.6 Phenotypes of wild-type and GA-deficient mutants of Arabidopsis
PP5e-Fig jpg
8
Figure 20.8 Histochemical analysis of Arabidopsis plants containing the GA1 promoter
PP5e-Fig jpg
9
Figure 20.24 Phenotypes of floral organs of gamyb mutants of rice
PP5e-Fig jpg
10
Figure 20.9 Phenotypes and genotypes of peas that differ in GA1 content of their vegetative tissue
PP5e-Fig jpg
11
Figure 20.10 Genetically engineered dwarf wheat plants
PP5e-Fig jpg
12
Figure 20.11 Impaired seed development in a GA-deficient mutant of pea
PP5e-Fig jpg
13
Figure 20.12 GA binding properties of GID1 (GA Insensitive Dwarf)
PP5e-Fig jpg
14
Figure 20.13 Phenotypes of gid1a, gid1b, and gid1c mutants of Arabidopsis (Part 1)
PP5e-Fig jpg
15
GA receptor mutants exhibit deficient anther development.
Figure Phenotypes of gid1a, gid1b, and gid1c mutants of Arabidopsis (Part 2) PP5e-Fig jpg GA receptor mutants exhibit deficient anther development.
16
Figure 20.14 Structure of the GA3-GID1a-DELLA complex
PP5e-Fig jpg
17
Figure 20.15 Model of GA-induced change in the GID1 protein
PP5e-Fig jpg
18
Figure 20.16 Domain structures of the RGA and GAI repressor proteins
PP5e-Fig jpg
19
Figure 20.19 Degradation of the DELLA protein by the 26S proteasome
PP5e-Fig jpg
20
Figure 20.20 Integration of light and GA signaling in Arabidopsis seedlings
PP5e-Fig jpg
21
Figure 20.17 Opposite effects of two different mutations in the same SLN1 repressor gene
GA signals the degradation of negative regulators, e.g. the degradation of DELLA proteins. Sln1c loss-of-function. Mutated in GRAS domain; unable to repress GA responsive genes even in the absence of GA. Sln1d gain-of-function. Mutation in DELLA domain prevents the repressor protein from being degraded. PP5e-Fig jpg
22
Figure 20.21 Structure of barley grain and functions of tissues during germination
PP5e-Fig jpg
23
Figure 23.3 Precocious germination in the ABA-deficient vivipary 14 mutant of maize
Ratio of GA:ABA affects early germination (vivipary). With high levels of ABA, seeds remain dormant. PP5e-Fig jpg
Similar presentations
