The shoot apex as the site of an inhibitory effect of applied auxin on photoperiodic induction of flowering in the short-day plant Chenopodium rubrum L.

1974 ◽  
Vol 71 (4) ◽  
pp. 345-348 ◽  
Author(s):  
Jan Krekule ◽  
Jaroslav Přívratský
Keyword(s):  
Shoot Apex ◽  
Inhibitory Effect ◽  
Chenopodium Rubrum ◽  
Photoperiodic Induction ◽  
Short Day ◽  
Applied Auxin

Comparative Expression Analysis of DFL, a LFY/FLO Homologue Gene in Dendranthema lavandulifolium Responds to Photoperiodic Induction

2012 ◽  
Vol 518-523 ◽  
pp. 154-158
Author(s):  
Yue Ping Ma ◽  
Lin Lin Wang ◽  
Hui Liu ◽  
Si Lan Dai
Keyword(s):  
Real Time ◽  
Expression Analysis ◽  
Shoot Apex ◽  
Reproductive Development ◽  
Photoperiodic Induction ◽  
Rt Pcr ◽  
Short Day ◽  
Chrysanthemum Lavandulifolium ◽  
Comparative Expression Analysis

he expression of the floral regulators DFL, a LFY/FLO homologue from Chrysanthemum lavandulifolium was examined during short day light treatments. Quantitative real-time RT-PCR experiments showed that DFL was expressed in the vegetative apices and throughout the shoot apex following photoperiodic induction. After 5 days of induction, DFL expression was increased markly and expressed in highest levels after 20 days induction. Expression of DFL in the shoot apex at the time of floral determination indicating that DFL gene is involved in the first steps of the transition from vegetative to reproductive development.

scholarly journals Four Hour Temporal Relation of 5-HTP and L-DOPA Induces Inhibitory Responses in Recrudescing Gonad of Indian Palm Squirrel (Funambulus pennantii)

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Ranjana Jaiwal ◽  
C. M. Chaturvedi
Keyword(s):  
Environmental Factors ◽  
Basic Mechanism ◽  
Inhibitory Effect ◽  
Temporal Relation ◽  
Day Length ◽  
Short Day ◽  
Long Day ◽  
Testicular Recrudescence ◽  
Neurotransmitter Activity ◽  
Seasonally Breeding

Daily injections of L-dihydroxyphenylalanine (L-DOPA, dopamine precursor) given 4 h after 5-hydroxytryptophan (5-HTP, serotonin precursor) induced inhibitory responses in recrudescing gonad (in the first week of December) of Indian palm squirrel, a seasonally breeding subtropical animal. Other temporal relations (L-DOPA given at 0, 8, 12, 16, and 20 h after 5-HTP administration) did not show any effect on the recrudescing gonad. This inhibitory effect of 4 h was evident under short day length (6 : 18) group but was masked by the increasing day length of nature (NDL, late December onwards) and increased photoperiod of long day group (16 : 8). It is apparent that seasonal testicular recrudescence of Indian palm squirrel during short day length by 4 h relation of 5-HTP and L-DOPA is not a pharmacological effect but actually is an alteration of seasonality in this annually breeding mammal. It seems that endogenous mechanism controlling seasonal testicular recrudescence of Indian palm squirrel is reset by timed daily injections of these neurotransmitter drugs. It is suggested that in spite of different environmental factors (photoperiod, humidity, etc.) used by different species to time their annual reproduction, basic mechanism of seasonality appears to be the same, that is, the temporal synergism of neurotransmitter activity.

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