scholarly journals Photoperiodic control of diapause induction in the zygaenid moth Thyrassia penangae – involving day-length measurement

2017 ◽  
Vol Volume 8 ◽  
pp. 1-5
Author(s):  
Hai-Min He ◽  
Chao Chen ◽  
Hai-Jun Xiao ◽  
Fang-Sen Xue
Keyword(s):  
Diapause Induction ◽  
Length Measurement ◽  
Day Length ◽  
Photoperiodic Control

Photoperiodic Control of Diapause Induction in the Larva of Lucilia Caesar L. (Diptera: Calliphoridae)

1967 ◽  
Vol 46 (1) ◽  
pp. 117-122
Author(s):  
R. A. RING
Keyword(s):  
Direct Effect ◽  
Diapause Induction ◽  
Short Photoperiod ◽  
Photoperiodic Control ◽  
One Stage ◽  
Photoperiod Regime ◽  
Absolute Length ◽  
The Absolute ◽  
Diapause Incidence ◽  
Long Photoperiod

1. It has been shown that photoperiod has a direct effect on the larva of Lucilia casear L. in the induction of diapause. 2. Transference of larvae from long to short photoperiod conditions during the 1st, 2nd, or 3rd instar increases their tendency to enter diapause. Conversely, transfer from short to long photoperiod conditions decreases their tendency to enter diapause. 3. Larvae are sensitive to changes in the absolute length of the photoperiod during all instars. The reaction is not restricted to any one stage but tends to be cumulative; thus the earlier the larvae are transferred from one photoperiod regime to another then the greater the contrast in diapause incidence between experimental groups and controls.

A method for induction and quantification of diapause entry in the swede midge (Diptera: Cecidomyiidae)

2012 ◽  
Vol 144 (6) ◽  
pp. 792-800 ◽  
Author(s):  
Lauren E. Des Marteaux ◽  
Marc B. Habash ◽  
Jonathan M. Schmidt ◽  
Rebecca H. Hallett
Keyword(s):  
Diapause Induction ◽  
Day Length ◽  
Retrieval Method ◽  
Short Day ◽  
Long Day ◽  
Rearing Conditions ◽  
Swede Midge ◽  
Pupal Mortality ◽  
Contarinia Nasturtii ◽  
Cool Conditions

AbstractInduction of diapause under laboratory conditions is a valuable tool for the study of dormancy in economic pests such as the swede midge, Contarinia nasturtii Kieffer (Diptera: Cecidomyiidae). In the present study, diapause in larval swede midge was achieved via manipulation of rearing photoperiod and temperature. Frequency of diapause was assessed by sieve separation of diapause cocoons from pre-sifted peat substrate following emergence of pupating individuals. Mean diapause frequency for swede midge larvae reared under cool conditions with short day length or cool conditions with decreasing day lengths were 45.2% and 19.5%, respectively. Only 1.2% of swede midge reared under warm, long day length conditions entered diapause. A small percentage of larvae neither pupated nor entered diapause and remained in substrate long after other individuals had emerged as adults. This behaviour was more prevalent under cool and short or decreasing day length rearing conditions. Approximately 76% of the larvae used for diapause induction were recovered with the present larval and cocoon retrieval method, and premature (larval and pupal) mortality averaged 18.2%. Although diapause occurred in the present study, conditions resulting in higher diapause frequencies should be investigated and attempts should be made to improve survival and recovery of individuals.

Inheritance of photoperiodic control of larval diapause in the Asian corn borer Ostrinia furnacalis (Guenée)

2015 ◽  
Vol 105 (3) ◽  
pp. 326-334 ◽  
Author(s):  
L. Xiao ◽  
H.M. He ◽  
P.S. Zhong ◽  
S. Fu ◽  
C. Chen ◽  
...  
Keyword(s):  
Diapause Induction ◽  
Ostrinia Furnacalis ◽  
Corn Borer ◽  
Photoperiodic Control ◽  
Long Day ◽  
Critical Daylength ◽  
Asian Corn Borer ◽  
Photoperiodic Responses ◽  
Additive Inheritance ◽  
Diapause Incidence

AbstractThe Asian corn borer, Ostrinia furnacalis enters diapause as fully grown larvae. Owing to geographical variation in photoperiodic control of diapause, the subtropical strain from Hefei city (HF) enters diapause in response to short daylengths, whereas the tropical strain from Ledong county (LD) exhibits almost no diapause under the same conditions. The two strains were used in crosses to study the inheritance of diapause. The HF strain showed a typical long-day response with a critical daylength of approximately14.97 h at 22 °C, 14.60 h at 25 °C and 13.68 h at 28 °C. The LD strain showed weak photoperiodic responses at 22 and 25 °C; and the F1 progeny also showed a long-day response with significantly shorter critical daylength compared with the HF strain. However, the LD × HF (F × M) crosses had significantly longer critical daylengths than HF × LD crosses, indicating a sexual bias in the inheritance of diapause induction, with the male parent having more influence on the F1 progeny. The critical daylength in a backcross to HF was significantly longer than a backcross to LD. Whether the inheritance of diapause fits an additive hypothesis or not depended on photoperiod, with results from different photoperiods showing additive inheritance or incomplete dominance of either diapause or non-diapause. Unlike diapause induction, the duration of diapause for reciprocal crosses was equally influenced by each parent, suggesting that diapause incidence and maintenance are controlled by separate systems in O. furnacalis.

scholarly journals Influence of photoperiod on vegetation phases and tuber development in topinambour (Helianthus tuberosus L.)

2012 ◽  
Vol 64 (1) ◽  
pp. 175-182 ◽  
Author(s):  
S. Terzic ◽  
Jovanka Atlagic ◽  
Ivana Maksimovic ◽  
Tijana Zeremski ◽  
Sofija Petrovic ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Opposite Effect ◽  
The Other ◽  
Day Length ◽  
Helianthus Tuberosus ◽  
Length Of Day ◽  
Tuber Development ◽  
Vegetative Phase ◽  
Photoperiodic Control ◽  
The Third

A topinambour collection was analyzed to determine the genetic variability of 141 accessions in reaction to the length of day (light), its influence on vegetative and flowering phases, tuber number and mass. Day length significantly influenced flowering, which started with the first shorter days (15.6 h) in the third decade of June, while the majority of accessions flowered in the third decade of August (13.3 h). Differences between accessions were statistically significant for the analyzed phenotype traits. A significantly longer vegetative phase was found in Montenegrin accessions in comparison to the other groups of origin. Duration of the vegetative phase was significantly and positively correlated to tuber mass and negatively to their number, while duration of the reproductive phase had an opposite effect. For further work on topinambour breeding, it would be important to describe the mechanism of photoperiodic control of flowering initialization. Only by obtaining accessions neutral to the photoperiod could topinambour become a cultivated crop.

scholarly journals FKF1 and GIGANTEA Complex Formation Is Required for Day-Length Measurement in Arabidopsis

Science ◽  
2007 ◽  
Vol 318 (5848) ◽  
pp. 261-265 ◽  
Author(s):  
M. Sawa ◽  
D. A. Nusinow ◽  
S. A. Kay ◽  
T. Imaizumi
Keyword(s):  
Complex Formation ◽  
Length Measurement ◽  
Day Length
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