Cucumber seedlings

Yu JQ, Masui YH (1997) Effects of root exudates of cucumber and allelochemicals onion uptake by cucumber seedling. J Chem Ecol 23 817-827 Zemenchik RA, Albrecht KA, Boerboom CM, Lauer JG (2000) Com production with kura clover as a living mulch. Agron J 92 698-705... 

An Early Site of Physiological Damage to Soybean and Cucumber Seedlings following Ozonation... 

We have been utilizing soybean and cucumber seedlings in attempts to acquire physiological evidence of rapid or early damage symptoms induced by ozone concentrations in a range to be... 

Figure 3. Ozonation dose-response for 9-day cucumber seedlings. Legend as in Figure 1.

Pistillate flowers are usually formed earlier (at a lower node) when plants are grown under a short photoperiod. A similar but less striking effect can be induced by a brief (2- to 3-week) exposure of cucumber seedlings, beginning at cotyledon expansion, to a short photoperiod, followed by an extended photoperiod (3). 

Although the n-butyl ester had little effect on the growth of cucumber seedlings, butyl Cellosolve ester was almost as effective as the acid (10). Since the Cellosolve esters are relatively insoluble in water, hydrolysis may have occurred. 

Omran, R.G. (1980). Peroxide levels and the activities of catalase, peroxidase, and indoleacetic acid oxidase during and after chilling cucumber seedlings. Plant Physiology 65, 407-8. 

Yu, J.Q., Matsui, Y. Effects of root exudates of cucumber (Cucumis sativus) and allelochemicals on ion uptake by cucumber seedlings. J ChemEcol 1997 23 817-827. 

Cucumber seedlings (Cucumis sativus Long Green Improved ) were grown in a growth chamber maintained at a temperature of 25°C and a photon flux density (PFPD) of 200 pmol s"1 m 2 continuous illumination. Electrolyte leakage induced by compounds was determined using 4 mm cotyledon discs as described by Kenyon... 

Since the actual or potential phytotoxicity of a phenolic acid is determined by its physical and chemical properties and the susceptibility of the plant process involved, the actual or potential phytotoxicity of a given phenolic acid is best determined in nutrient culture in the absence of soil processes. The phytotoxicity observed in soil systems represents a realized or observed phytotoxicity, not the actual phytotoxicity, of a given phenolic acid. For example, the actual relative phytotoxicities (or potencies) for cucumber seedling leaf expansion were 1 for ferulic acid, 0.86 for p-coumaric acid, 0.74 for vanillic acid, 0.68 for sinapic acid, 0.67 for syringic acid, 0.65 for caffeic acid, 0.5 for p-hydroxybenzoic acid and 0.35 for protocatechuic acid in a pH 5.8 nutrient culture.5 In Portsmouth Bt-horizon soil (Typic Umbraquaalts, fine loamy, mixed, thermic pH 5.2), they were 1, 0.67, 0.67, 0.7, 0.59, 0.38, 0.35, and 0.13, respectively.19 The differences in phytotoxicity of the individual phenolic acids for nutrient culture and Portsmouth soil bioassays were due to various soil processes listed in the next paragraph and reduced contact (e.g., distribution and movement)36 of phenolic acids with roots in soils. 

As with soil microbes, the data available for microbes in the rhizosphere that can utilize phenolic acids as a carbon source are also very limited. Phenolic acid utilizing microbial populations observed within the rhizosphere of cucumber seedlings and mature wheat plants range from 107 to 1013 CFU/g root (Table 3.2). 

Significant response of phenolic acid utilizing cucumber seedling rhizosphere bacteria to phenolic acid, sunflower leaf tissue, or wheat plant tissue. 

That microorganisms can reduce the observed phytotoxic effects of phenolic acids has been observed by a number of researchers.3,7 8 33 37 38 39 41,45 I am, however, not aware of any study that has attempted to quantify how changes in bulk-soil bacteria might influence the phytotoxicity of phenolic acids. I am aware of only one study that has attempted to quantify how changes in rhizosphere microbial populations may influence the phytotoxicity of phenolic acids. Blum et al.9 observed that a 500% increase of phenolic acid utilizing bacteria in the rhizosphere of cucumber seedlings growing in Cecil A-horizon soil enriched with an equimolar mixture of 0.6 pmol/g p-coumaric acid, ferulic acid, p-hydroxybenzoic acid, and... 

Blum, U. and Dalton, B. R., 1985. Effects of ferulic acid, an allelopathic compound, on leaf expansion of cucumber seedlings grown in nutrient culture. J. Chem. Ecol. 11, 279-301... 

Gerig, T. M. and Blum, U. 1991. Effects of mixtures of four phenolic acids on leaf area expansion of cucumber seedlings grown in Portsmouth B- soil materials. J Chem. Ecol. 17, 29-40... 

Booker, F. L., Blum, U., and Fiscus, E. L. 1992. Short-term effects of ferulic acid on ion uptake and water relations in cucumber seedlings. J. Exp. Bot. 43, 649-655... 

Subsequent colonization patterns, after application of microbes to leaves, appear to be nonrandom. Leben (67) observed that 19-28 days after inoculation of leaf buds of cucumber seedlings with suspensions of Pseudomonas syringae pv. lachrymans the bacterium appeared to be distributed uniformly on the two expanding leaves below the bud (by leaf imprints on a selective medium). However, on older leaves the bacterium was usually distributed nonrandomly, often found associated with epidermal cells on leaf veins and with basal cells of trichomes on veins. Bacterial aggregates were generally less prevalent on older leaves. The distribution on older leaves was thought to be related to leaf moisture (67). Blakeman (79) reported that bacterial or yeast cells immediately after inoculation onto bean leaves (Vicia faba L.) were evenly distributed on anticlinal walls of epidermal cells. Later, differential colonization was detected (79). When... 

Corpas, F. J., and Trelease, R. N., 1998, Differential expression of ascorbate peroxidase and a putative molecular chaperone in the boundary membrane of differentiating cucumber seedling peroxisomes, J. Plant Physiol. 153 332n338. 

Terzi 1, Kocapali kan 1, BenUoglu, Solak K (2003) Effects of juglone on growth of cucumber seedlings with respect to physiological and anatomical parameters. Acta Physiologiae Plantarum 25 353-356... 

Figure 1. Effect of brassinolide on the growth (A) and cotyledon-chlorophyll content (B) of cucumber seedlings subjected to chilling stress, measured 5 days after chiding treatment. (Ochi, N. and Katsumi, M. unpublished)...

Little is known about in vivo regulation of AIH. Arcaine, a bisguanidine substrate analog, is reported to be a competitive inhibitor of AIH in maize and cucumber seedlings, " and a substrate for Chlorella virus AIH. ... 

The new 2-epi- 1-dehydroklaineanone (134) isolated from the leaves Eurycoma longifolia showed moderate activity (plant growth inhibitor) against cucumber seedling [56]. 

Fig. 6. Metabolism of 24-epibrassinolide in cucumber seedlings and the cultured cells of tomato and Ornithopus sativus.

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