Phaeoside, a Novel Galactoside of Hydroxymanoyl Oxide from the Gibberellin A1-ProducingPhaeosphaeriasp. L487

2004 ◽  
Vol 68 (11) ◽  
pp. 2418-2420 ◽  
Author(s):  
Hiromichi KENMOKU ◽  
Tomoharu SUGAI ◽  
Hiroyuki YAJIMA ◽  
Takeshi SASSA
Keyword(s):  
Gibberellin A1

Mass Production of Pure Gibberellin A1by Phaeosphaeria sp. L487 and the Fungal Preparation of [U-13C]Gibberellin A1

2001 ◽  
Vol 65 (9) ◽  
pp. 2095-2097 ◽  
Author(s):  
Hiromichi KENMOKU ◽  
Tadaomi OOZONE ◽  
Tomoharu SUGAI ◽  
Takeshi SASSA
Keyword(s):  
Mass Production ◽  
Gibberellin A1

ChemInform Abstract: Partial Synthesis of (1β,2α,17,17-D4) Gibberellin A1.

ChemInform ◽  
2010 ◽  
Vol 28 (48) ◽  
pp. no-no
Author(s):  
P. FUCHS ◽  
A. PORZEL ◽  
G. SCHNEIDER
Keyword(s):  
Partial Synthesis ◽  
Gibberellin A1

Metabolism of gibberellin A1 in germinating bean seeds

1972 ◽  
Vol 11 (5) ◽  
pp. 1611-1616 ◽  
Author(s):  
Ronn Nadeau ◽  
Lawrence Rappaport
Keyword(s):  
Gibberellin A1

Control of Stem Elongation by Gibberellin A1: Evidence From Genetic Studies Including the Slender Mutant sln

1993 ◽  
Vol 20 (5) ◽  
pp. 585 ◽  
Author(s):  
JJ Ross ◽  
JB Reid ◽  
SM Swain
Keyword(s):  
Stem Elongation ◽  
Stem Length ◽  
Wild Type ◽  
Garden Pea ◽  
Genetic Studies ◽  
Developing Seed ◽  
In The Wild ◽  
Pea Mutant ◽  
Gibberellin A1 ◽  
Prohexadione Calcium

Information from well-known stem length mutants, both short and elongated, is discussed in the context of criteria necessary to demonstrate that the level of GA1 controls stem elongation in wild- type plants of the garden pea. Whilst this evidence is compelling, a mutant which over-produces GA1 would afford further insight, particularly into whether GA1 levels are saturating for growth in the wild-type. In this paper we further characterise the first reported garden pea mutant (sln) which possesses elevated levels of GA1. Evidence is presented from studies using this mutant that GA1 is normally limiting for growth over the early internodes in wild-type plants. In the developing seed, the mutant sin is shown to block the metabolism of [13C, 3H]GA29 to [13C, 3H]GA29-catabolite, particularly in the testa. Associated with this there were dramatically elevated GAGA29 levels in the dry seed from sln plants (400 times) compared with seeds from Sln plants. Upon germination, it appears that some of this GAGA20 is converted to GAGA1, which leads to substantial elongation of the early internodes. This hypothesis is supported by the observation that the inhibitor of an early step in GA biosynthesis, paclobutrazol, reduces elongation of sln plants when applied to developing seeds but not when applied at the start of germination. By contrast, prohexadione-calcium (BX-112), which inhibits the step GA20 to GA1, dramatically reduces internode length of sln plants when applied to seeds at the start of germination. Finally, application of GA20 to the dry seed of a wild-type (Sln) line (before sowing) resulted in a phenocopy of the sln mutant.

Regulation in Lolium temulentum of the Metabolism of Gibberellin A20 and Gibberellin A1 by 16,17-Dihydro GA5 and by the Growth Retardant, LAB 198 999

1997 ◽  
Vol 24 (3) ◽  
pp. 359 ◽  
Author(s):  
O. Junttila ◽  
R.W. King ◽  
A. Poole ◽  
G. Kretschmer ◽  
R.P. Pharis ◽  
...  
Keyword(s):  
Growth Retardation ◽  
Higher Plants ◽  
Shoot Elongation ◽  
Stem Growth ◽  
Growth Retardant ◽  
Shoot Tips ◽  
Stem Tissue ◽  
Lolium Temulentum ◽  
Gibberellin A1 ◽  
Excised Tissue

The ring D-modified gibberellin [GA], 16,17-dihydro GA5, can retard stem growth in Lolium temulentum L. while promoting flowering (Evans et al., 1994, Planta193, 107–114). Using [1,2,3-3 H]GA20 to study the final biosynthetic step to GA1 (a known effector of shoot elongation in higher plants), it was shown that C-3b-hydroxylation of GA20 to GA1 is blocked by 16,17-dihydro GA5 but is little affected by GA5. Another late-stage biosynthetic inhibitor, the acylcyclohexanedione, LAB 198 999, also blocked GA1 formation. Furthermore, endogenous levels of GA20 built up after application of 16,17-dihydro GA5. Consequently, growth retardation by 16,17-dihydro GA5 and LAB 198 999 is likely to be the result of their inhibition of GA20 3b-hydroxylation to GA1. Another fate for GA20 in Lolium is its C-2b-hydroxylation to growth-inactive GA29. This conversion was also inhibited by 16,17-dihydro GA5 but less so by LAB 198 999. The analogous step involving 2b-hydroxylation of GA1 to GA8 appeared to be insensitive to either growth retardant. When [3H]GA20 was injected into the cavity within the young intact sheathing leaves, there was an appreciable metabolism of this GA20 to GA1 and thence to GA8 (ca 10% and 30% respectively within 5 h). For excised shoot tips, however, [3H]GA20 was converted rapidly and virtually completely to GA29 in 3–5 h. Interestingly, with these excised shoot tips, GA3 and GA5 as well as 16,17-dihydro GA5 when applied via the agar strongly inhibited 2b-hydroxylation of GA20 to GA29. In contrast, while 16,17-dihydro GA5 blocked GA20 metabolism to GA29 in intact sheath/stem tissue, this conversion was not inhibited by GA5. These differences in structural specificity for GAs which inhibit 2b-hydroxylation as opposed to 3b-hydroxylation are in accordance with these two Ring-A hydroxylation steps being catalysed by different enzymes. Finally, the differences in GA20 metabolism between intact versus excised tissue raise the possibility that tissue wounding with excision enhanced the activity of the GA20 2b-hydroxylase(s).

scholarly journals Fate of Radioactive Gibberellin A1 in Maturing and Germinating Seeds of Peas and Japanese Morning Glory

1968 ◽  
Vol 43 (5) ◽  
pp. 815-822 ◽  
Author(s):  
Gerard W. M. Barendse ◽  
Hans Kende ◽  
Anton Lang
Keyword(s):  
Morning Glory ◽  
Japanese Morning Glory ◽  
Gibberellin A1 ◽  
Germinating Seeds

Quantitation of gibberellins and the metabolism of [3H]gibberellin A1 during somatic embryogenesis in carrot and anise cell cultures

Planta ◽  
1982 ◽  
Vol 155 (5) ◽  
pp. 369-376 ◽  
Author(s):  
Masana Noma ◽  
Jochen Huber ◽  
Dieter Ernst ◽  
Richard P. Pharis
Keyword(s):  
Somatic Embryogenesis ◽  
Cell Cultures ◽  
Gibberellin A1
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