This fact can be explained by the presence of hormones in seeds, mainly cytokinins and gibberellins
, which aid in cell division and expansion, and in the mobilization of nutrients (JACKSON, 2003).
(GAs) affected plant height (YAMAGUCHI, 2008).
(GAs) are a large group of tetracyclic diterpenoid carboxylic acids, The GAs show positive effects on seed germination, leaf expansion, stem elongation, flower and trichome initiation, and flower and fruit development, They are essential for plants throughout their life cycle for growth-stimulatory functions.
soaking could significantly improve the seed germination rate; low temperature storage could prolong the vitality of gentian seeds.
8 + +++ fluorescent Plant growth promoting traits Pseudomonas isolates Plant growth regulators ([micro]g /ml) Auxins Gibberellins
Cytokinins An-1-Jub 17 150 18 An-3-Jub 19 70 30 An-4-Jub 19 90 22 An-5-Jub 14 120 30 Ar-1-Jub 13 100 25 An-1-Sh 21 180 28 An-2-Sh 07 60 35 Ar-1-Sh 22 80 28 Ar-2-Sh 21 110 28 L 16 135 20 M 11 140 24 C 36 160 16 * Phosphate solubilizing activity expressed in terms of tricalcium phosphate solubilization which in turn represents pg/ml of soluble inorganic phosphate(Pi) in supernatant as calibrated from the standard curve of K[H.
, this plant hormone influences germination, seedling growth, stem elongation, leaf development, bud outgrowth, flower induction, and xylem expansion (Gabriele et al.
It has been demonstrated that fruit set and early development are mainly induced by endogenous hormones produced in the ovaries, such as auxins and gibberellins
(GAs), which have been described in the ovaries of pollinated or parthenocarpic fruits , or the exogenous application of hormones to unpollinated ovaries [6-7].
Effect of prohexadione-calcium on growth components and endogenous gibberellins
contents ofrice (OryzasativaL.
Promotion of flowering in black spruce using gibberellins
However, higher germination for dark incubated seeds could indicate the biosynthesis of gibberellins
(mediated through the phytochrome system) may have been inhibited by light exposure (Kato-Noguchi, 2002).
Some of these mecha-nisms include inhibition of arachidonic acid pathway as well as inhibition of inflammatory mediators such as histamine, prostaglandins and serotonin15 due to presence of anti-inflammatory agents like lectins, Sali-cyclic acid, acemanan, isoaloeresin D, malic acid acy-lated carbohydrates, auxins, gibberellins
, bradykinases and superoxie dismutase.
11:40 AM Keller (P) ARE GIBBERELLINS
INVOLVED IN CONTROL OF