scholarly journals Ecotypic Variation of the Photoperiodic Response in Populus

1954 ◽  
Vol 35 (2) ◽  
pp. 167-188
Author(s):  
Scott S Pauley ◽  
Thomas O Perry
Keyword(s):  
Photoperiodic Response ◽  
Ecotypic Variation

ECOTYPIC VARIATION IN PHOTOPERIODISM OF TREES WITH SPECIAL REFERENCE TO PINUS RESINOSA AND THUJA OCCIDENTALIS

1962 ◽  
Vol 40 (6) ◽  
pp. 849-856 ◽  
Author(s):  
O. Vaartaja
Keyword(s):  
Special Reference ◽  
Growth Pattern ◽  
Tree Species ◽  
Pinus Resinosa ◽  
Photoperiodic Response ◽  
Endogenous Rhythm ◽  
Thuja Occidentalis ◽  
Ecotypic Variation ◽  
Middle Latitudes ◽  
Broad Subject

A certain daylength treatment inhibited the growth of northern seedlings of Pinus resinosa and Thuja occidentalis more than it inhibited southern seedlings of these species. These treatment – seed source interactions were small, but otherwise similar to those found earlier in 29 northern tree species. The smallness of the interaction was caused by the overruling effect of the endogenously determined growth pattern in P. resinosa, and by the lack of large photoperiodic response in T. occidentalis.The broad subject of ecotypic variation in the photoperiodism of trees is discussed. The evolution of dormancy mechanism suggests that photoperiodism should tend to be overruling in the truly northern trees, and the endogenous rhythm in trees from the middle latitudes.

Ecotypic variation affects the conservation of North American badgers endangered along their northern range extent

2018 ◽  
Author(s):  
Richard D. Weir ◽  
Trevor A. Kinley ◽  
Richard W. Klafki ◽  
Clayton D. Apps
Keyword(s):  
British Columbia ◽  
Cause Of Death ◽  
Conservation Strategies ◽  
High Fecundity ◽  
Ecological Information ◽  
The Core ◽  
Ecotypic Variation ◽  
Sufficient Energy ◽  
Soil Deposits ◽  
Regional Conservation

This chapter is based on ecological information on 82 radio-tagged badgers (39 F, 43 M) among three study populations in British Columbia, Canada between 1996 and 2010, data that were collected to learn more about the ecology of badgers and consider how variation in their ecology might inform regional conservation strategies. The widely spaced, lower density prey and distribution of soil deposits suitable for digging in British Columbia likely required badgers to use substantially larger areas, relative to the core range, in which to acquire sufficient energy to survive and reproduce. Strikes from automobiles were the primary cause of death among all radio-tagged badgers and this source of mortality is pervasive throughout the limited distribution of badgers in British Columbia. Despite their potential for high fecundity, populations of badgers in British Columbia likely remain at considerable risk compared to those in the core of the species’ range.

Photoperiodic Response of Flowering in Two-Branched Soybean Plants

1979 ◽  
Vol 140 (4) ◽  
pp. 414-417 ◽  
Author(s):  
S. Shanmugasundaram ◽  
Wang Chao-Chin ◽  
T. S. Toung
Keyword(s):  
Photoperiodic Response ◽  
Soybean Plants

Effects of carbon dioxide on Pharbitis, Xanthium, and Silene in short days

1974 ◽  
Vol 52 (6) ◽  
pp. 1283-1291 ◽  
Author(s):  
A. N. Purohit ◽  
E. B. Tregunna
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Concentration ◽  
Dry Weight ◽  
Morphological Characters ◽  
Photoperiodic Response ◽  
Pharbitis Nil ◽  
Light Sources ◽  
Short Day ◽  
Unit Leaf ◽  
Silene Armeria

The flowering response and other morphological characters of Pharbitis nil, Xanthium pennsylvanicum, and Silene armeria were studied in environments with different levels of carbon dioxide and oxygen under short-day conditions. Different light sources and intensities were also tested. Irrespective of the light source and intensity used, higher levels of carbon dioxide delayed or inhibited flowering as well as other morphological characters of the short-day plants but induced flowering in the long-day plant. Dry weight per unit leaf area as well as total chlorophyll increased with carbon dioxide concentration. The results are discussed in relation to some other recent reports, and it is proposed that large variations in photosynthetic rates of plants probably alter their photoperiodic response.

Responses of Some Turkish Wheat Cultivars to Vernalization and Photoperiod

1988 ◽  
Vol 24 (2) ◽  
pp. 237-245
Author(s):  
Serpil Terzioğlu
Keyword(s):  
Bread Wheat ◽  
Normal Development ◽  
Photoperiodic Response ◽  
Reliable Information ◽  
Floral Initiation ◽  
Wheat Cultivars ◽  
Primary Shoot ◽  
Time Of Year ◽  
Short Days

SUMMARYThe vernalization and photoperiodic response of six locally adapted bread wheat cultivars grown under natural daylength conditions during the summer or winter months was examined in glasshouse experiments. The wheat was vernalized by chilling imbibed grains at 2 ± 1°C for 0, 15 or 45 days. Vernalization for 45 days followed by long summer days led to floral initiation in all cultivars within 28 days but vernalization for 0 or 15 days only led to floral initiation in one cultivar. Vernalization followed by long days reduced the time from transplanting to anthesis, resulting in early ear emergence. Vernalization followed by short days accelerated the development of all the cultivars, but normal development could also occur without vernalization at this time of year. Apical differentiation of the primary shoot and its length and development gave the most reliable information on the period of vernalization required.

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