Effect of certain nitrogen fertilizers on growth, photosynthetic pigments, carbohydrates and lipid contents in Cucumis melo var aegyptiacus during germination and seedling growth

Application of nitrogen either NO3- or NH4NO3 at 102 and 101 ppm or NH4+ at 101 ppm to Cucumis melo plants highly significantly increased their rate of growth [expressed a mean length of shoot and root mean fresh and dry weights of seedlings and mean number of lateral roots] than those of the untreated seedlings. Increasing the N-concentration to 103 ppm, these growth criteria were either slightly decreased due to both NO3- and NH4+ treatments or increased as a result of NH4NO3 application. As a consequence to the different nitrogen forms used, the total pigments, chlorophyll [a], chlorophyll [b] and carotenoids were highly elevated above those of the control levels, although NO3- at 103 ppm and each of NH4+ and NH4NO3 at 103 and 102 ppm decreased the chlorophyll [b] contents

interactive effect of water stress and each of ABA, alar and proline on certain metabolic activities in red radish plants

The interactions between each of ABA; 2 ppm [growth inhibitor], alar; 500 ppm [growth retardant] and proline; 100 ppm [amino acid] and water stress were undertaken in a trial to find out the best means in overcoming the injurious effect of soil drought on red radish plant. Under drought condition, the different treatments mentioned above caused remarkable increases in soluble sugars [reducing sugars and sucrose], polysaccharides, total sugars, 2-oxo-acids, amino-N, total soluble-N, total-N and protein-N above those of the untreated stressed plants, except that ABA-treated leaves contained less amounts of sucrose, at the later two ages, as compared with the untreated stressed ones. Moreover, foliar spraying of the stressed plants with both alar and proline resulted in the accumulation of each of P, Mg, Ca, Fe, B and Cu, with the exception that alar reduced the Cu values below the control amounts. In response to ABA treatment, P, Fe and B levels were elevated while Mg, Ca and Cu levels were decreased as being compared with those of the stressed untreated plants. Alar was found to be, the most effective applied chemicals for alleviating the adverse effect of drought on most of the metabolic activities of red radish plant

Effect of 2,4-D, GA3 and BA on some metabilities and mineral composition of leaves of drought stressed red radish plants

This work was conducted to investigate the possible role played by some growth promoters on certain metabolites in leaves of red radish plants grown under drought condition. Consequently, treatment with each of 2,4-D [1 ppm], GA3 [50 ppm] and BA [10 ppm] was found, in general, to increase markedly the values of soluble sugars [reducing sugars and sucrose], polysaccharides, total sugars, 2

"o acids, phosphorus, magnesium, calcium and boron above those of the control, while it decreased the contents of amino-N, copper and iron below those of the control plants Moreover, foliar application of GAS increased the total soluble-N, protein-N and total-N, while spraying leaves with either 2,4-D or BA mostly decreased these nitrogen fractions compared to those of the control

Seasonal changes of 2-oxo-acid free amino acid contents in bud, leaves andinflorescences of morus plant

The seasonal changes of 2-oxo -acid and the free amino acid contents in apical and axillary buds, leaves and inflorescences of Morns were determined. Higher levels of 2-oxo- acids were observed in the dormant apical and axillary buds. These levels were then decreased progressively reaching minimum amounts in swollen buds followed by progressive increases in the grown buds attaining their maximum levels with the onset of bud dormancy. Moreover, the values of 2-oxo-acids increased at the early growth stages of leaves and inflorescences, followed by graduall decreases, attaining their minimum levels in the abscised leaves and inflorescences, Amino acids determined in the Morns buds showed their higher levels prior to the bud swelling and the active shoot growth. Young leaves and inflorescences contained relative high contents of free amino acids, while these contents decreased gradually during abscission of leaves and male inflorescences and ripening of fruits