Effects of temperature on cell division in root meristems of natural populations of Dactylis glomerata of contrasting latitudinal origins

1993 ◽  
Vol 33 (3) ◽  
pp. 433-442 ◽  
Author(s):  
H.M.C. Creber ◽  
M.S. Davies ◽  
D. Francis
Keyword(s):  
Cell Division ◽  
Natural Populations ◽  
Dactylis Glomerata ◽  
Root Meristems ◽  
Effects Of Temperature

scholarly journals Temporal patterns of cell division in natural populations of endosymbiotic algae

1983 ◽  
Vol 28 (5) ◽  
pp. 1009-1014 ◽  
Author(s):  
F. P. Wilkerson ◽  
G. Muller ◽  
Parker L. Muscatine
Keyword(s):  
Cell Division ◽  
Natural Populations ◽  
Temporal Patterns ◽  
Endosymbiotic Algae

Competition between natural populations of Dactylis glomerata

1971 ◽  
Vol 77 (2) ◽  
pp. 187-193 ◽  
Author(s):  
C. F. Eagles ◽  
D. H. Williams
Keyword(s):  
Mixed Culture ◽  
Natural Populations ◽  
Dactylis Glomerata ◽  
Portuguese Population ◽  
Physiological Basis ◽  
Competitive Effects ◽  
Yield Increase ◽  
Norwegian Population ◽  
The Mean ◽  
Competitive Abilities

SummaryThe competitive abilities of two natural populations of Dactylis glomeratafrom Norway and Portugal were studied under three controlled environments, 7 °C with an 8 h photoperiod, 20 °C with a 16 h photoperiod, and 30 °C with a 16 h photoperiod. The temperature and daylength treatments affected both the growth habits and the relative competitive abilities of the populations. At 7 °C, 8 h photoperiod the Norwegian population became prostrate and was suppressed in mixed culture compared with its performance in monoculture, and an increased specific leaf area indicated competition for light. At 30 °C, 16 h photoperiod the Norwegian population was more erect than the Portuguese, and more aggressive, with a better performance in mixed culture than in monoculture. The performance of the Portuguese population was not affected significantly either by culture or by environment. At 20 °C, 16 h photoperiod, however, the Portuguese population was suppressed, while the Norwegian population performed better in mixed than in monoculture. This yield increase of the Norwegian population was greater than the decrease of the Portuguese population, and so the mixed culture yielded significantly more than the mean of its component monocultures, whereas at 7 and 30 °C the mixed culture yielded no more than the mean of its monocultures. The physiological basis of these competitive effects is discussed.

scholarly journals Potentiation of Lateral Root Induction by Root Initials in Isolated Flax Roots

1959 ◽  
Vol 12 (4) ◽  
pp. 388 ◽  
Author(s):  
PL Goldacre
Keyword(s):  
Cell Division ◽  
Lateral Root ◽  
Lateral Roots ◽  
Chemical Stimulus ◽  
Root Induction ◽  
Indolylacetic Acid ◽  
Root Meristems

When ,B-indolylacetic acid (IAA) (10-5M) is added to isolated flax roots, lateral roots are induced to form adventitiously. If some lateral root initials are already present when IAA is added, newly induced primordia form preferentially immediately adjacent to them. It is suggested that a chemical stimulus, a kinin, originating from the existing root meristems interacts with IAA to induce further cell division in the pericycle. It is proposed that kinin formation may be a normal accompaniment of cell division.

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