Effect of Light Intensity on Growth of Natural Populations of Dactylis glomerata L.

1973 ◽  
Vol 37 (2) ◽  
pp. 253-262 ◽  
Author(s):  
C. F. EAGLES
Keyword(s):  
Light Intensity ◽  
Natural Populations ◽  
Dactylis Glomerata ◽  
Dactylis Glomerata L ◽  
Effect Of Light

ETUDE DE L'HEREDITE DE PHOSPHATASES ACIDES CHEZ LE DACTYLE (DACTYLIS GLOMERATA) DIPLOIDE ET TETRAPLOIDE

1981 ◽  
Vol 23 (3) ◽  
pp. 513-523 ◽  
Author(s):  
R. Lumaret
Keyword(s):  
Polymorphic Locus ◽  
Natural Populations ◽  
Dactylis Glomerata ◽  
Wild Plants ◽  
Starch Gel Electrophoresis ◽  
Ploidy Levels ◽  
Orchard Grass ◽  
In The Wild ◽  
Starch Gel ◽  
Dactylis Glomerata L

Starch gel electrophoresis of leaves of diploid and more particularly tetraploid orchard grass (Dactylis glomerata L.) from cultivars as well as natural populations disclosed several anodal stable bands with fast migration and phosphatasic activity. Six different phenotypes with one band, many others with three regular bands or six bands (only in the tetraploid individuals), were observed, showing the dimeric structure of the enzymes. Inheritance studies showed one polymorphic locus with six codominant alleles AcPH 11.00, AcPH 10.95, AcPH 10.90, AcPH 10.88, AcPH 11.02 and AcPH 11.04 with differences in enzymatic expression. AcPH 1.00 and AcPH 10.90 have been found in the two ploidy levels. Results from the tetraploid progenies involved tetravalents in meiosis for individuals originating from cultivars but bivalents in the wild plants. The two loci AcPH 1 and GOT 1 (this last one coding for a glutamate oxaloacetate transaminase) are not linked and seem to be located on different chromosomes.

Effect of environment on competitive ability of two natural populations of Dactylis glomerata L.

1969 ◽  
Vol 72 (2) ◽  
pp. 271-272 ◽  
Author(s):  
C. F. Eagles ◽  
D. H. Williams
Keyword(s):  
Competitive Ability ◽  
Natural Populations ◽  
Dactylis Glomerata ◽  
Dry Weight ◽  
Portuguese Population ◽  
Light Regimes ◽  
Norwegian Population ◽  
Competition For Light ◽  
Growth Habits ◽  
Dactylis Glomerata L

SUMMARYThe competitive ability of two natural populations of Dactylis glomerata, one from Norway and the other from Portugal, was investigated by growing them in monoculture and together in a mixed sward under different temperature and light regimes. At 7 °C and 8 h photoperiod, the performance of the prostrate Norwegian population grown in mixture with the erect Portuguese population was suppressed as compared with its performance in monoculture. However, at 30 °C and 16 h photoperiod, when the growth habits of these two populations were reversed in comparison to those at 7 °C, the dry weight per plant of the erect Norwegian population was significantly greater in the mixed sward than in monoculture. The dry weight per plant of the Portuguese population did not differ significantly in the two types of sward at either temperature. The results are discussed in relation to competition for light.

scholarly journals Variation in DNA C value in natural populations of Dactylis glomerata L.

1994 ◽  
Vol 128 (3) ◽  
pp. 555-561 ◽  
Author(s):  
H. M. C. CREBER ◽  
M. S. DAVIES ◽  
D. FRANCIS ◽  
H. D. WALKER
Keyword(s):  
Natural Populations ◽  
Dactylis Glomerata ◽  
C Value ◽  
Dactylis Glomerata L

Chlorophyll a and c in Cultures of Marine Algae

1963 ◽  
Vol 14 (2) ◽  
pp. 148 ◽  
Author(s):  
GF Humphrey
Keyword(s):  
Light Intensity ◽  
Chlorophyll A ◽  
Growth Phase ◽  
Marine Algae ◽  
Skeletonema Costatum ◽  
Natural Populations ◽  
Initial Growth ◽  
Cell Numbers ◽  
Maximum Cell ◽  
Effect Of Light

Gymnodinium, Nitzschia closterium, and Skeletonema costatum were grown in the presence of bacteria, and N. closterium in the absence of bacteria, for 7 weeks. Each week samples were analysed by the Richards-Thompson method for chlorophyll a and c. Maximum cell numbers were reached in 1-3 weeks. Gymnodinium grew better at 680 f.c. than at 420 f.c. but the reverse was true of Nitzschia and Skeletonema. The chlorophyll content of the Gymnodinium cultures was similar at each light intensity but Nitzschia gave more chlorophyll at 420 f.c. With Skeletonema there was no consistent effect of light. During the initial growth phase, Gymnodinium contained 0.33-0.87 �g chlorophyll a and 0.56-1.88 pg chlorophyll c per million cells. The corresponding figures for Skeletonema were 0.03-0.06 and 0.03-0.08, and for Nitzschia 0.13-1.08 and 0.11-0.87. The ratio of c to a varied from 1.30 to 1.84 for Gymnodinium, 0.69 to 1 .61 for Skeletonema, and 0.44 to 2.21 for Nitzschia. These ratios are all less than the maximum (3.3) found for natural populations of phytoplankton from the Coral and Tasman Seas. There was no evidence in the culture experiments that chlorophyll c breaks down more slowly than a and thus accumulates in old populations.

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