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Browsing by Author "Erez, Mehmet E."

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    Article
    The Effects of an Artificial and Static Magnetic Field on Plant Growth, Chlorophyll and Phytohormone Levels in Maize and Sunflower Plants
    (Ferdinand Berger Soehne, 2007) Turker, Musa; Temirci, Cabir; Battal, Peyami; Erez, Mehmet E.
    In the present study the effects of a continuous static magnetic field (SMF) on growth and concentration of phytohormones and chlorophylls were investigated in maize and sunflower plants. SMF was applied in two directions; parallel to gravity force (field-down) and anti-parallel (field-up). Chlorophyll concentrations decreased in maize plants, but increased in sunflower in SMF of either direction. Root dry weight decreased in maize and increased in sunflower plants. The changes of dry weight in stem and leaf were not significant (p >= 0.05). The root length decreased in both plant species. Leaf and stem length increased in maize plants in SMF of either direction. Leaf length did not change in sunflower, whereas stem length rose in field-down application of SME Concentrations of gibberellic acid-equivalents (GAs), indole-3-acetic acid (IAA) and trans-zeatin (t-Z) increased in sunflower plants under field-up application of SMF whereas they decreased in SMF of the opposite direction. The concentration of phytohormones decreased in maize plants in SMF of either direction.
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    Article
    Molecular and Physiological Changes in Maize (Zea Mays) Induced by Exogenous Naa, Aba and Meja During Cold Stress
    (Finnish Zoological Botanical Publishing Board, 2008) Battal, Peyami; Erez, Mehmet E.; Turker, Musa; Berber, Ismet
    Different concentrations of abscisic acid (ABA), naphthalene acetic acid (NAA) and methyl jasmonate (MeJa) were applied to maize (Zea mays) plants exposed to cold stress. ABA enhanced plant resistance against the damaging effects of freezing. ABA-treated plants produced some specific proteins when exposed to cold. Prominent changes were observed in the size and number of stomata with the application of ABA during cold stress. MeJa inhibited root growth, but increased root dry weight during cold acclimation. The chlorophyll content was lower at 100 mu g ml(-1) NAA and 50 mu g ml(-1) MeJa and higher in the residual applications when compared with that in the control plants. Carotenoid levels increased in all NAA and some ABA treatments, decreased however in MeJa treatment. Exogenous MeJa treatments increased endogenous trans-zeatin (t-Z) and indole-3-acetic acide (IAA) in contrast decreased ABA levels. Exogenous NAA also increased endogenous IAA, ABA and zeatin riboside (ZR) levels, while exogenous ABA decreased endogenous IAA and ZR levels.