Bryophyllum daigremontianum

There are other difficulties in the interpretation of data from experiments using growth retardants. First of all, the site of action of the compounds should be determined, since this will have important implications for the role of GAs in flower initiation. For example, CCC inhibits flower initiation following photoinduction in both the LSDP Bryophyllum daigremontianum and the SDP Pharbitis nil, but in the former case the growth retardant acts in the leaf whereas it is the apex that is the affected tissue in the latter [25,27]. 

The floral stimulus acts at the apex and therefore determination of the site of GA action is important in formulating logical hypotheses about the role of GAs in flower initiation. Although not examined in many species, the evidence indicates that GAs can affect flower initiation at different sites. Flower induction brought about by GAg treatments in Bryophyllum daigremontianum and Hyoscyamus niger is the result of GA action in the leaves, not the apex where the floral stimulus acts [21, 22]. The situation is quite different in the SDP Pharbitis nil and Impatiens balsamina, where it was determined that the apex is the site of GA action [ 16,25,27]. 

Deleens,E., Garnier-Dardart, . Carbon isotope composition of biochemical fractions isolated from leaves of Bryophyllum daigremontianum Berger, a plant with Crassulacean Acid Metabolism Some physiological aspects related to CO2 dark fixation. Planta 139, 214-248 (1977)... 

Garnier-Dardart,J., Queiroz,0. Malic enzymes in the leaves of Bryophyllum daigremontianum. Phytochemistry 13,1695-1702 (1974)... 

Kaplan, A., Gale,J., Poljakoff-Mayber,A. Simultaneous measurement of oxygen, carbon dioxide, and water vapour exchange of intact plants. J. Exp. Bot. 97, 214-219 (1976 a) Kaplan, A., Gale,J., Poljakoff-Mayber,A. Resolution of net dark fixation of carbon dioxide into its respiration and gross fixation components in Bryophyllum daigremontianum. J. Exp. Bot. 97,220-230 (1976 b)... 

Kramer,D., Willert,D. J. von Vacuole-like spaces in Bryophyllum daigremontianum and Bryo phyllum tubiflorum. Naturwissenschaften 59,315-316 (1972)... 

Kristen, U. Untersuchungen Uber den Zusammenhang zwischen dem C02-Gaswechsel und Luftwegigkeit an den CAM-Sukkulenten Bryophyllum daigremontianum Berg, und Agave americana L. Flora 160,127-138 (1969)... 

Ludlow, M.M., Wilson, G.L. Photosynthesis of tropical plants. IV. Basis and consequences of differences between grasses and legumes. Aust. J. Bot. Sci. 25,1133-1145 (1972) Luttge,U., Ball,E. Proton and malate fluxes in cells of Bryophyllum daigremontianum leaf slices in relation to potential osmotic pressure of the medium. Z. Pflanzenphysiol. 73, 326-338 (1974)... 

Fig. 140. Evidence for the participation of DNA in the formation of crown galls. Both halves of the blade of a leaf of Bryophyllum daigremontianum are wounded and infected with Agrobacterium tumefaciens. The left half of the leaf is treated, in addition, with 5-fluorodeoxyuridine, a competitive inhibitor of thymidilate synthesis. On this side no tumors form, only a wound callus (modified from Bopp 1963).

Table 11. The relationship between gibberellic acid and florigen in the long day-short day plant Bryophyllum daigremontianum. LD = long day, SD = short day, GA = gibberellic acid, —from... to, — = no flowers, + = flower formation...

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