The influence of daminozide, an inhibitor of gibberellins biosynthesis, on the somatic embryogenesis in immature and mature embryo derived from tissue cultures of wheat was investigated. Low concentrations of daminozide (0.064-0.127 mM) positively affected the somatic embryogenic capacity of immature embryos (cv. ‘Andros’) cultured on the medium supplemented with either 2,4-dichlorophenoxyaceti...

Feeding experiments with ent-kaurenoic acid (4), 15 alpha-hydroxy-ent-kaurenoic acid (5), 15 beta-hydroxy-ent-kaurenoic acid (6), and mixtures of 4 plus 5 and 4 plus 6 were conducted using the SG138 mutant of Gibberella fujikuroi, to gain information about the phenotype of this unique strain. The biotransformation of 5 gave 7 beta,15 alpha-dihydroxykaurenolide (9) and 7 beta,15 alpha-dihydroxy-...

Flowering of Nicotiana tabacum cv Xhanti depends on gibberellins because gibberellin-deficient plants, due to overexpression of a gibberellin 2-oxidase gene (35S:NoGA2ox3) or to treatment with the gibberellin biosynthesis inhibitor paclobutrazol, flowered later than wild type. These plants also showed inhibition of the expression of molecular markers related to floral transition (NtMADS-4 and N...

Barley endosperm halves release acid phosphatase in response to several gibberellins and gibberellin precursors. Seed halves incubated with 10(-7)m GA(3) at 29 degrees begin to release phosphatase after 11 hr and release it for another 26 hr in response to GA(3). After 37 hr, the rate of release slows to that of seed halves incubated without GA(3). GA(3) is active at 10(-10)m and maximally acti...

Gibberellins (GAs) are involved in the regulation of numerous developmental processes in plants including zygotic embryogenesis, but their biosynthesis and role during somatic embryogenesis (SE) is mostly unknown. In this study we show that during three week- long induction phase, when cells of leaf explants from non-embryogenic genotype (M9) and embryogenic variant (M9-10a) were forming the ca...

Plants undergo two different developmental programs depending on whether they are growing in darkness (skotomorphogenesis) or in the presence of light (photomorphogenesis). It has been proposed that the latter is the default pathway followed by many plants after germination and before the seedling emerges from soil. The transition between the two pathways is tightly regulated. The conserved COP...

In Arabidopsis thaliana, the initiation of flowering is carried out by four genetic pathways: gibberellin, autonomous, vernalization, and light-dependent pathways. These processes are integrated by the function of the genes FD, FE, FWA, PDF2, SOC1, and FT at the integration pathway. The integrated signal of the floral induction is transmitted to the floral meristem identity genes LFY and AP1, a...

(Current Biology 31, R250–R252; March 8, 2021)The authors wish to correct a naming error that appeared in the original version of this Dispatch. Gibberellins were named for sexual form Fusarium fujikuroi (Gibberella fujikuroi), from which gibberellins initially isolated. The referred species as verticillioides. apologize and any confusion may have resulted. 2021) Ecology: Fungal Mimics Dupe Ani...