This study aimed to evaluate the effect of four light intensities (90, 140, 190 and 240 µmol m-2 s-1) provided by red-blue LED (spectrum ratio: R660/B450 = 4/1) on growth quality hydroponic cultivated spinach. The results showed that when intensity increased, plant height, leaf number, root length, width, shoot fresh weight, dry weight were increased but specific shoot-to-root ratio did not inc...

Plantago virginica L. has invaded many lawn ecosystems in the Eastern part of China. The invasion has incurred an economic cost to remove them. In order to prevent the invasion, it is critical to understand the invasive mechanisms of this species. However, few studies have been conducted on the allelopathic mechanisms of its invasion. In this study, we examined allelopathic effects of P. virgin...

Defining root death in studies of root dynamics is problematic because cell death occurs gradually and the resulting effects on root function are not well understood. In this study, metabolic activity of grape roots of different ages was assessed by excised root respiration and tetrazolium chloride reduction. We investigated changes in metabolic activity and patterns of cell death occurring wit...

Fraedrich, S. W., Cram. M. M.. and Handoo. Z. A. 2003. Suitabiliiy of southern pines. other selected crops. and nutsedge to a O~?~qicloru.s sp. associated with stunting of loblolly pine seedlings. Plant Dis. X7: 1129-l 132. An undescribed needle nematode (Longirlonrs sp.) has been associated with severely stunted loblolly pine seedlings at a south Georgia nursery. Containers with selected crop ...

Salinity is one of the most limiting abiotic stresses in global agricultural sector. The objective this study was to evaluate effect irrigation water salinity on initial development P. edulis Sims. seedlings propagated by seeds, grafting and cuttings. Treatments were distributed a completely randomized design, 5 x 3 factorial arrangement, corresponding levels electrical conductivity (0.3 - cont...

Root systems of 6-month-old, cold-hardened, container-grown black spruce seedlings (Picea mariana (Mill.) B.S.P.) were exposed to 0, -5, -10, -15, -20, or -22.5 degrees C. Freezing-induced damage to fine roots, coarse roots and the whole root system was assessed by various viability tests including leakage of electrolytes, leakage of phenolic compounds, water loss, root and shoot water potentia...

The relationship between soil water availability, root extension, and shoot growth of lohlolly pine seedlings (Pinus taedu L.) was evaluated in a rhizotron sand mixture in the absence and presence of crabgrass (Digitaria spp.) competition. Heights and diameters of seedlings grown with crabgrass were reduced 33 and SO%, respectively, compared with seedlings grown in pine monoculture. Furthermore...

The present study is focused on the importance of SNP, a NO donor, as Cd stress modulator on seedlings of cabbage. The exogenously applied Cd induced stress in cabbage seedlings to explore the protective role of SNP. 21-day-old seedlings were grown in Hoagland solution and Cd at 0.5 and 0.7 mM concentration with and without SNP. The biophysical and biochemical parameters were analyzed. Cd exhib...

Mechanical site preparation is frequently proposed to alleviate problematic soil conditions when afforesting retired agricultural fields. Without management of soil problems, any seedlings planted in these areas may exhibit poor growth and survival. While mechanical site preparation methods currently employed in hardwood afforestation are proven, there is a substantial void in research comparin...