Technique for evaluating the potential for growth of shoot and root buds of white clover (Trifolium repens)

1992 ◽  
Vol 119 (2) ◽  
pp. 179-183 ◽  
Author(s):  
P. C. D. Newton ◽  
M. J. M. Hay
Keyword(s):  
Relative Humidity ◽  
Constant Temperature ◽  
White Clover ◽  
Environmental Conditions ◽  
Trifolium Repens ◽  
Experimental Results ◽  
Root Primordia ◽  
Primary Interest ◽  
Root Buds ◽  
Subtending Leaves

SUMMARYAn assay was developed for assessing the potential for growth of shoot and root buds of white clover. This paper describes the technique and the experimental results on which it was based. The assay involved the incubation of nodes under standard conditions and the monitoring of bud activity at the nodes. Shoot buds were of primary interest but the assay was also used to investigate the activity of root primordia. Correlative influences were reduced by separating individual nodes and by removal of their subtending leaves and petioles. The optimal environmental conditions for incubation were: a constant temperature of 20 °C, a 24 h photoperiod of low irradiance (4 W/m2) and a high relative humidity (≥ 90%). The technique proved suitable for the monthly screening of 1000–2000 nodes sampled from field populations of white clover.

Factors Affecting Toxicity and Translocation of Glyphosate in Cotton(Gossypium hirsutum)

Weed Science ◽  
1978 ◽  
Vol 26 (5) ◽  
pp. 509-513 ◽  
Author(s):  
G. D. Wills
Keyword(s):  
Relative Humidity ◽  
Gossypium Hirsutum ◽  
Constant Temperature ◽  
Environmental Conditions ◽  
Plant Tissue ◽  
Fold Increase ◽  
Herbicide Application ◽  
Factors Affecting ◽  
Treated Area ◽  
Lower Stem

Toxicity of nonradiolabeled and translocation of14C-labeled glyphosate [N-(phosphonomethyl)glycine] in cotton(Gossypium hirsutumL.) were evaluated under different environmental conditions as affected by surfactant and by the maturity of the plant tissue at the place of herbicide application. Toxicity was affected primarily by temperature with 21 to 40% greater cotton injury at 25 C than at 35 C. The addition of surfactant often increased toxicity under environmental conditions where toxicity was initially low. Absorption and translocation of14C was affected primarily by relative humidity (RH). At constant temperature and rate of surfactant, an increase in RH from 40 to 100% resulted in a 3- to 6-fold increase in translocation of14C. Autoradiograms indicated that the movement of the14C-label was primarily into leaves above the treated area. Translocation of14C was significantly greater following application to the mature lower stem than to the mature lower leaves or to immature upper stem or leaves of cotton.

Growth and survival of white clover (Trifolium repens) transplanted into patches of different grass species

1996 ◽  
Vol 74 (8) ◽  
pp. 1243-1247 ◽  
Author(s):  
Loyal A. Mehrhoff ◽  
Roy Turkington
Keyword(s):  
White Clover ◽  
Environmental Conditions ◽  
Trifolium Repens ◽  
Grass Species ◽  
Growth And Survival ◽  
Selection Processes ◽  
Reciprocal Transplants ◽  
Neighbouring Plant ◽  
Dactylis Glomerata L ◽  
Biotic Differentiation

Previous studies on Trifolium repens L. showed differentiation with respect to neighbouring plant species and local environmental conditions. In this study, we conducted a series of reciprocal transplants among and within different pastures and among neighbouring grass species (Lolium perenne L., Dactylis glomerata L., and Holcus lanatus L.). While the presence of a grass neighbour decreased survival and growth of T. repens, no evidence of differentiation by T. repens to either local environmental conditions or to neighbouring grass species was found. We suggest that T. repens, in systems like our study pastures that have small, transient grass patches, may show inconsistent and ephemeral responses to the presence of neighbouring plants, whereas in other systems with larger grass patch size and a longer period of exposure to selection processes, T. repens show fine-scale biotic differentiation to neighbouring grass species. Keywords: population differentiation, white clover, selection, microevolution, transplantation.

scholarly journals Natural and Forced Circadian Oscillations in the Leaf of Trifolium Repens

1972 ◽  
Vol 25 (1) ◽  
pp. 61 ◽  
Author(s):  
BIH Scott ◽  
HF Gulline
Keyword(s):  
Constant Temperature ◽  
White Clover ◽  
Trifolium Repens ◽  
Phase Shifts ◽  
The Mean ◽  
Temperature Entrainment

The leaves of white clover (T. repens) exhibit typical circadian characteristics with an endogenous period, T, of 25-27 hr. Oorresponding oscillations are observed of the torque exerted by leaflets prevented from closing. The mean variation in torque during a cycle was 339 � 13 dyne cm. When leaves were subjected to light-dark cycles at constant temperature, entrainment was obtained for periods from 0�7 to 1� 4T. Phase shifts were observed ranging from a lag of 40� for O' 7T to an advance of 130� for 1� 4T. The pulvinus was shown to be both the photoreceptor and the site of the endogenous timer.

THE PERFORMANCE OF S170 TALL FESCUE IN CANTERBURY

1974 ◽  
pp. 214-215
Author(s):  
B.R. Watkin
Keyword(s):  
New Zealand ◽  
White Clover ◽  
Tall Fescue ◽  
Trifolium Repens ◽  
Festuca Arundinacea ◽  
Sheep Grazing ◽  
Selection Of

AN Aberystwyth selection of tall fescue (Festuca arundinacea Schreb.), known as S170, was sown with certified New Zealand white clover (Trifolium repens) and re' clover (T. pratense) and compared under sheep grazing with other grass/clover pastures at the Grasslands Division Regional Station at Lincoln (Watkin, 1975) .

Nodulation of white clover (Trifolium repens) in the absence ofRhizobium

PROTOPLASMA ◽  
1994 ◽  
Vol 179 (3-4) ◽  
pp. 106-110 ◽  
Author(s):  
J. Blauenfeldt ◽  
P. A. Joshi ◽  
P. M. Gresshoff ◽  
G. Caetano-Anollés
Keyword(s):  
White Clover ◽  
Trifolium Repens
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