Inhibition of stem growth and gibberellin production in Agrostemma githago L. by the growth retardant tetcyclacis

Planta ◽  
1985 ◽  
Vol 166 (2) ◽  
pp. 276-279 ◽  
Author(s):  
J. A. D. Zeevaart
Keyword(s):  
Stem Growth ◽  
Growth Retardant ◽  
Gibberellin Production

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).

Gibberellin Production in Pea Seeds Developing in Excised Pods: Effect of Growth Retardant AMO-1618

Science ◽  
1965 ◽  
Vol 147 (3654) ◽  
pp. 155-157 ◽  
Author(s):  
B. Baldev ◽  
A. Lang ◽  
A. O. Agatep
Keyword(s):  
Growth Retardant ◽  
Gibberellin Production ◽  
Pea Seeds ◽  
Amo 1618

Evidence for the involvement of jasmonic acid in the control of the stem-growth habit of soybean plants

1991 ◽  
Vol 83 (1) ◽  
pp. 22-26 ◽  
Author(s):  
Yasunori Koda ◽  
Koichi Yoshida ◽  
Yoshio Kikuta
Keyword(s):  
Jasmonic Acid ◽  
Growth Habit ◽  
Stem Growth ◽  
Soybean Plants

Effects of defoliation on current-year stem growth and fine root dynamics in Fraxinus mandschurica and Larix gmelinii seedlings

2014 ◽  
Vol 38 (10) ◽  
pp. 1082-1092 ◽  
Author(s):  
LI Jun-Nan ◽  
◽  
WANG Wen-Na ◽  
XIE Ling-Zhi ◽  
WANG Zheng-Quan ◽  
...  
Keyword(s):  
Fine Root ◽  
Stem Growth ◽  
Larix Gmelinii ◽  
Root Dynamics ◽  
Fine Root Dynamics

Root and Stem Growth Patterns of Young `Mauritius' Lychee Trees

HortScience ◽  
1996 ◽  
Vol 31 (5) ◽  
pp. 815-818 ◽  
Author(s):  
Thomas E. Marler ◽  
Leah E. Willis
Keyword(s):  
Root Growth ◽  
Stem Growth ◽  
Growth Patterns ◽  
Extension Growth ◽  
Glass Wall ◽  
Litchi Chinensis ◽  
Root Extension ◽  
Stem Extension ◽  
Root Observation

`Mauritius' lychee (Litchi chinensis Sonn.) trees were planted in root observation chambers in July 1990 to determine the pattern of root and stem extension growth during 12 months. Root and stem lengths were measured at intervals ranging from 7 to 18 days from Aug. 1990 until Aug. 1991. During each period of active canopy growth, up to six stem tips were tagged and measured. Root growth was determined by measuring tracings of the extension of each root in a visible plane of the glass wall of the observation chambers. Stem growth was cyclic, with distinct periods of rapid extension followed by periods with no extension. In contrast, root growth was fairly continuous with only three periods of no visible root extension. Mean absolute extension rates were higher for stems than for roots. There were no consistent relationships between the timing of root and stem extension growth.

scholarly journals Modeling the Radial Stem Growth of the Pine (Pinus sylvestris L.) Forests Using the Satellite-Derived NDVI and LST (MODIS/AQUA) Data

Atmosphere ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 12
Author(s):  
Yulia Ivanova ◽  
Anton Kovalev ◽  
Vlad Soukhovolsky
Keyword(s):  
Land Surface ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Principal Component ◽  
Stem Growth ◽  
Forest Growth ◽  
Parabolic Approximation ◽  
New Approach ◽  
The Relationship ◽  
Tree Increment

The paper considers a new approach to modeling the relationship between the increase in woody phytomass in the pine forest and satellite-derived Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST) (MODIS/AQUA) data. The developed model combines the phenological and forest growth processes. For the analysis, NDVI and LST (MODIS) satellite data were used together with the measurements of tree-ring widths (TRW). NDVI data contain features of each growing season. The models include parameters of parabolic approximation of NDVI and LST time series transformed using principal component analysis. The study shows that the current rate of TRW is determined by the total values of principal components of the satellite indices over the season and the rate of tree increment in the preceding year.

Initiation, Development and Anatomy of Lignotubers in Some Species of Eucalyptus

1984 ◽  
Vol 32 (4) ◽  
pp. 415 ◽  
Author(s):  
DJ Carr ◽  
R Jahnke ◽  
SGM Carr
Keyword(s):  
Analytical Study ◽  
Growth Habit ◽  
Stem Growth ◽  
Morphological Development ◽  
Alternative Pathways ◽  
Stem Wood ◽  
Initial Survey ◽  
And Performance ◽  
Lateral Fusion ◽  
Taxonomic Groups

An initial survey of the diversity of early lignotuber development in Eucalyptus and an analytical study of the anatomy of young lignotubers and the seedling stem are presented. Studies of the early stages of the morphological development of the lignotuber in 13 species, representative of five taxonomic groups, resulted in the recognition of four modes of lignotuber initiation. The importance to lignotuber formation of the presence of a suite of accessory buds, adaxial to the axillary bud, is emphasized but lignotuber initiation is not in all cases associated with these buds. Lignotuber buds are derived by branching from existing buds, ultimately from the accessory buds of the node. Following its initiation, the possibilities of later morphological development of the lignotuber are discussed. Lignotuber growth may dominate over stem growth and the lignotubers at a node may then fuse laterally to encircle the stem. Stem growth, on the other hand, may dominate over lignotuber growth and the lignotuber then appears to regress. The consequences for the growth habit of the plant of these alternative pathways of development are outlined. The wood of young lignotubers (and that of the swollen hypocotyl) is shown to be different in composition and in the sizes of its elements from that of seedling stem wood; these differences owe their origin to differences in the nature and performance of the cambia of the lignotuber and stem. In lateral fusion of the lignotubers at a node, and their upward and downwards extension over the stem, e.g. over the hypocotyl, stem cambial initials are either progressively lost or, more likely, converted to lignotuber-type initials. The possibility of the reverse process occumng in stem dominance is discussed.

Effect of the growth retardant LAB 198 999, an acylcyclohexanedione compound, on epicotyl elongation and metabolism of gibberellins A1 and A20 in cowpea

Planta ◽  
1992 ◽  
Vol 188 (2) ◽  
pp. 245-251 ◽  
Author(s):  
JaimeF. Mart�nez-Garc�a ◽  
Jos�L. Garc�a-Mart�nez
Keyword(s):  
Growth Retardant ◽  
Epicotyl Elongation

scholarly journals Stem growth habit affects leaf morphology and gas exchange traits in soybean

2009 ◽  
Vol 104 (7) ◽  
pp. 1293-1299 ◽  
Author(s):  
Yu Tanaka ◽  
Tatsuhiko Shiraiwa
Keyword(s):  
Gas Exchange ◽  
Leaf Morphology ◽  
Growth Habit ◽  
Stem Growth
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