The influence of kinetin and sucrose on the photosynthetic activity of carrot (Daucus carota) tissue cultures in relation to growth was investigated. The results showed that light contributes heavily to the growth of tissue cultures measured in terms of fresh and dry weight and cell division activity. In light, the fresh weight, dry weight, and number of cells per explant were about or more tha...

At 260 Grand Rapids lettuce seeds require an exposure to white or red (6500A-6800A) light in order to germinate. This stimulating effect is reversed if this illumination is followed immediately by a brief exposure to far-red light (7000A-7500A). This phenomenon, discovered by Flint and McAllister (4), has been widely studied (3, 8). Many factors, such as lowering the temperature to 160 (1), can...

The senescence of oat leaves has been studied by following the loss of chlorophyll and protein and the increase of alpha-amino nitrogen, after detachment and darkening. Protein synthesis and the amounts of proteolytic enzymes in the leaves have been determined directly. The process of senescence is shown to be a sequential one in which protein synthesis,most probably the formation of a proteoly...

Recent studies emphasize the importance of mRNA splicing in human genetic disease, as 20-30% of all disease-causing mutations are predicted to result in mRNA splicing defects. The plasticity of the mRNA splicing reaction has made these mutations attractive candidates for the development of therapeutics. Familial dysautonomia (FD) is a severe neurodegenerative disorder, and all patients have an ...

Zygophyllum simplex L. is a succulent annual that grows on the coastal and inland saline flats around Karachi, Pakistan. The seeds are moderately salt tolerant during germination. Germination of Zygophyllum simplex seeds under various salinity, proline, betaine, GA and kinetin treatments was determined. Proline (0±1 and 1 m) and betaine (0±1 and 1 m) alleviated the innate dormancy of seeds, a...

The growth responses of Phaseolus vulgaris L., cv. "Red Kidney" plants to simazine at 5 x 10~M and 5 x 10^M, kinetin at 9 x 10~M and 9 x 10~M, and the presence or absence of Rhizobium phaseoli ATCC14482, in factorial combination, were measured. The plants were analyzed with respect to the lengths of the primary-through-quaternary leaves, stem height, fresh and dry weights, number of flowers, an...

The influence of exogenic hormones (indole-3-acetic acid (IAA), abscisic acid (ABA) and kinetin) on defense reaction of wheat (Triticum aestivum L.) calli to the bunt agent Tilletia caries (D.C.) Tul. & C. Tul. was studied. ABA and kinetin induced the oxalate oxidase activity, increased the Н2О2 level, decreased germination of fungi teliospores and induced on calli the occurrence of dense sites...

Callus cultures of Vaccinium corymbosum var. bluecrop were optimized for their isoprene derivatives production by supplementing Schenk-Hildebrandt (SH) medium with constant concentration of kinetin (2.32 microM) and two different amounts of selected auxins. Every auxin, except for IBA, used in 10-time higher concentration (2,4D, NAA, IAA, NOA) stimulated biosynthesis of beta-sitosterol and inhi...