The Effect of Linuron on 32P and 45Ca Uptake in Tomato and Parsnip

Weed Science ◽  
1968 ◽  
Vol 16 (2) ◽  
pp. 185-187 ◽  
Author(s):  
E. J. Hogue
Keyword(s):  
Nucleic Acid ◽  
Inorganic Phosphate ◽  
Culture Solution ◽  
Lycopersicum Esculentum ◽  
Pastinaca Sativa ◽  
Tomato Plants ◽  
45Ca Uptake ◽  
Nutrient Culture

The effects of sublethal and lethal levels of 3-(3,4-dichlorophenyl)-l-methoxy-l-methylurea (linuron) on the uptake of 32P and 45Ca were tested on tomato (Lycopersicum esculentum Mill., var. Kokomo) and parsnip (Pastinaca sativa L., var. Harris Model). Both levels of foliage-applied linuron stimulated the uptake of 32P from nutrient culture solution and its translocation to the leaves. The increased 32P in the leaves of the treated tomato plants was found in the inorganic phosphate fraction. Incorporation of the label in the phospholipid and nucleic acid fractions was decreased slightly. Linuron inhibited uptake and translocation of 45Ca in both plants.

scholarly journals The isolation from peat of certain nucleic acid derivatives

1917 ◽  
Vol 90 (623) ◽  
pp. 39-44 ◽  
Keyword(s):  
Nucleic Acid ◽  
Phosphoric Acid ◽  
Marked Effect ◽  
Lemna Minor ◽  
Culture Solution ◽  
Organic Substances ◽  
Water Culture ◽  
Bacterial Treatment ◽  
Pyrimidine Bases ◽  
Organic Nutrients

In a previous communication* describing the stimulating effect of certain organic substances, extracted from “bacterised” peat, on the growth of Lemna minor in water-culture solution, it was suggested that some of the substances may act directly as organic nutrients, being absorbed as such and utilised directly for building up the protein and other complex nitrogenous constituents of the plant. The marked effect of these substances on the development of the nucleus in the cells of the Lemna minor plants also suggested the possible presence of some nuclear constituent, such as nucleic acid, in the extracts. An examination of the aqueous extract of “bacterised” peat showed that, although it contained no nucleic acid, certain purine and pyrimidine bases, together with phosphoric acid, were present. As the presence of these free radicles indicated the possibility that nucleic acid exists as such in raw peat, and is decomposed by further bacterial treatment, an attempt was made to isolate nucleic acid from raw peat.

scholarly journals Degradation of Nucleic Acid by Allomyces macrogynus during the Production of Zoosporangia and Resistant Sporangia

1980 ◽  
Vol 33 (3) ◽  
pp. 393 ◽  
Author(s):  
Jean Youatt
Keyword(s):  
Nucleic Acid ◽  
Acid Solution ◽  
Glutamic Acid ◽  
Inorganic Phosphate ◽  
Distilled Water ◽  
Allomyces Macrogynus ◽  
Purines And Pyrimidines

Allomyces macrogynus plants were induced to make either zoosporangia in distilled water or resistant sporangia in a solution of glucose and glutamic acid. Analyses during the stages of developmentJ showed that plants of both series degraded nucleic acid, releasing uracil, hypoxanthine and guanin~ to the suspending medium. Plants in distilled water released inorganic phosphate to the medium while those in glucose-glutamic acid solution conserved the phosphate as bound phosphate. A. arbuscula also released the purines and pyrimidines.

scholarly journals 275 Water Relations of Fruit Cracking in Single-truss Tomato Plants

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 489E-489
Author(s):  
Takashi Ikeda ◽  
Kunio Okano ◽  
Yuka Sakamoto ◽  
Shin-ichi Watanabe
Keyword(s):  
Water Potential ◽  
Water Relations ◽  
Water Status ◽  
Potential Gradient ◽  
Culture Solution ◽  
Tomato Plants ◽  
Fruit Flesh ◽  
Fruit Cracking ◽  
Fruit Skin ◽  
Water Potential Gradient

This study was undertaken to investigate the water relations of tomato (Lycopersicon esculentum Mill.) fruit cracking for single-truss tomato plants. The tomato plants were cultured on a closed hydroponic system in greenhouse. Water status of culture solution and plant tissues was measured with psychrometers. Water potential of the culture solution for the stressed plant was changed from -0.06 MPa (control plants) to -0.36 MPa at 24 days after anthesis. Hardness of the fruit skin was not different significantly between the stressed plants and the control plants. Fruit cracking occurred frequently in the control plants, but not in the stressed plants. Water potential gradient between the tissue of fruit flesh and water source for the control plants was bigger than that of the stressed plants. Turgors were increased at the tissues of fruit flesh and fruit skin at the control plants between predawn and morning but not at the stressed plants. These results indicated that the water potential gradient and the increased turgor in these tissues might be a trigger for the occurrence of fruit cracking on single-truss tomato plants.

Herbicide and Inorganic Phosphate Influence on Phytase in Seedlings

Weed Science ◽  
1970 ◽  
Vol 18 (3) ◽  
pp. 360-364 ◽  
Author(s):  
Donald Penner
Keyword(s):  
Zea Mays ◽  
Hordeum Vulgare ◽  
Inorganic Phosphate ◽  
Sodium Arsenite ◽  
Potassium Phosphate ◽  
Inorganic Phosphorus ◽  
Phytase Activity ◽  
Culture Solution ◽  
Cucurbita Maxima ◽  
Per Se

Phytase activity increased 2 to 3 fold in barley (Hordeum vulgareL.), 6 fold in corn (Zea maysL.), and 12 fold in squash (Cucurbita maximaDuchesne) seedlings 2 days after the initiation of germination in the dark. Most of the phytase was found in the embryo of the seed, presumably in the cotyledon(s). Gibberellic acid and benzyladenine supplied during germination exerted only limited influence on the development of phytase in these seedlings. Of the herbicides studied, only sodium arsenite exerted an influence on phytase activityper sethat was of physiological significance. The presence of 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine), 3-amino-2,5-dichlorobenzoic acid (amiben), 2-chloro-N-isopropylacetanilide (propachlor), 2,6-dichlorobenzonitrile (dichlobenil), or α,α,α-trifluoro-2,6-dinitro-N-N-dipropyl-p-toluidine (trifluralin) in the culture solution during germination partially inhibited the development of phytase activity. The herbicidal inhibition was enhanced if potassium phosphate at a non-inhibitory level also was present in the culture solution. The interaction of atrazine and amiben with phosphorus was not due to increased internal concentrations of inorganic phosphorus to a level inhibitory to the development of phytase activity.

scholarly journals Vegetative growth and yield of tomato (Lycopersicum esculentum Mill.) in response to the systemic insecticide phorate

1998 ◽  
Vol 27 (3) ◽  
pp. 443-449 ◽  
Author(s):  
Raul N. C. Guedes ◽  
Nelsa M. P. Guedes ◽  
Marcelo Picanço
Keyword(s):  
Leaf Area ◽  
Vegetative Growth ◽  
Regression Models ◽  
Growth And Yield ◽  
Lycopersicum Esculentum ◽  
Systemic Insecticide ◽  
Tomato Plants ◽  
Insecticide Application ◽  
Multiple Regression Models ◽  
Negative Effect

The effect of the systemic insecticide phorate on vegetative growth and yield of tomato (Lycopersicum esculentum Mill.) was studied in the greenhouse. Three dosages of phorate (1.5, 7.5, and 13.5 mg a.i./ 1.5 L pot) were applied along with a control (without insecticide application). The plants were harvested at 17, 32, 51, 69, and 90 days after tilling. Regression analysis did not show any significant effect of insecticide dosages in plant and root length. However, an overall negative effect of phorate was observed on leaf area, shoot and root dry weights, and fruit fresh weight. Based on multiple regression models, maximum leaf area was obtained with 6.7 mg a.i./pot and maximum shoot and root dry weights were obtained with no insecticide application and 0.1 mg a.i./pot, respectively. Higher fruit fresh weights were also obtained without phorate application. Dosages of phorate close to the lower range recommended for pest control in tomatoes (1 kg a.i./ha) favored the increase in leaf area in tomato plants, but this increase did not cause higher yields. Phorate was slight detrimental to shoot and root growth, what led to a smaller yield in the phorate treated plants.

Etude cinétique de quelques événements lies à une levée de dominance apicale par décapitation ou ablation de l'axe principal à différents niveaux chez la Tomate, Lycopersicum esculentum

1980 ◽  
Vol 58 (2) ◽  
pp. 281-294
Author(s):  
Kim Anh Ha Ngoc
Keyword(s):  
Apical Dominance ◽  
Main Axis ◽  
Main Stem ◽  
Axillary Buds ◽  
Axillary Bud ◽  
Lycopersicum Esculentum ◽  
Tomato Plants ◽  
Different Levels

In intact tomato plants, axillary buds are completely inhibited by the main apex. A release from apical dominance is obtained by decapitation or excision of the main axis at different levels. These excisions lead to a wave of mitotic reactivation along the main stem which progresses in the basipetal way and is followed by an activation of axillary bud in the acropetal direction, from the base to the axillary bud apex. After release from apical dominance, axillary buds don't react equally. There is a basipetal gradient of their capacity of outgrowth. In the younger subapical axillary buds, mitotic reactivation is the first step observed (after 3 h); the cellular elongation occurs after 3–6 h, and foliar organogenesis begins only after 24 h. The basal axillary buds are reactivated much later. Adult leaves don't play any role on their axiliaries: the total defoliation of the plant does not lead to the outgrowth of all the axillary or cotyledonary buds.

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