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Gibberellins: Regulators of Plant Height and Seed Germination GA levels in plants are correlated with stem length. Play role in seed germination, transition.

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Presentation on theme: "Gibberellins: Regulators of Plant Height and Seed Germination GA levels in plants are correlated with stem length. Play role in seed germination, transition."— Presentation transcript:

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 GA 1 on wild-type and dwarf mutant maize

3 Figure 20.2 Cabbage can be induced to bolt and flower by applications of GA 3

4 Figure 20.3 Gibberellins induce conebud formation in juvenile conifers

5 Figure 20.4 Gibberellin induces growth in “Thompson Seedless” grapes

6 Ch. 20 In-Text Art, pp. 585–586 Gibberellin structures

7 Figure 20.6 Phenotypes of wild-type and GA-deficient mutants of Arabidopsis

8 Figure 20.8 Histochemical analysis of Arabidopsis plants containing the GA1 promoter

9 Figure Phenotypes of floral organs of gamyb mutants of rice

10 Figure 20.9 Phenotypes and genotypes of peas that differ in GA 1 content of their vegetative tissue

11 Figure Genetically engineered dwarf wheat plants

12 Figure Impaired seed development in a GA-deficient mutant of pea

13 Figure GA binding properties of GID1 (GA Insensitive Dwarf)

14 Figure Phenotypes of gid1a, gid1b, and gid1c mutants of Arabidopsis (Part 1)

15 Figure Phenotypes of gid1a, gid1b, and gid1c mutants of Arabidopsis (Part 2) GA receptor mutants exhibit deficient anther development.

16 Figure Structure of the GA 3 -GID1a-DELLA complex

17 Figure Model of GA-induced change in the GID1 protein

18 Figure Domain structures of the RGA and GAI repressor proteins

19 Figure Degradation of the DELLA protein by the 26S proteasome

20 Figure Integration of light and GA signaling in Arabidopsis seedlings

21 Figure 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.

22 Figure Structure of barley grain and functions of tissues during germination

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.


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