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Articles by Mehrdad Lahouti
Total Records ( 3 ) for Mehrdad Lahouti
  Mehrdad Lahouti , Samaneh Jamshidi , Hamid Ejtehadi , Mina Rowshani and Homa Mahmoodzadeh
  Ultrastructural studies of root cortical cells of Raphanus sativus L. seedlings experimentally exposed to 0-7 mg L1 Cr3+ revealed small electron dense granules especially in preplasmic zone. Root cortical cells of control seedlings grown in the absence of Cr3+ additions were void of any granules. X-ray microanalysis of the granules provided evidence that Cr was the predominant element while lower amounts of Fe, Zn and Mn were also measured in the granules. Presence of chromium deposit inclusions in the cells may be regarded as plant detoxifying mechanism to maintain relatively low cytoplasmic concentration of the element.
  Mehrdad Lahouti , Homa Mahmoodzadeh and Samaneh Jamshidi
  In the present research, effect of caffeine on structure and ultrastructure of shoot apical meristem of Phaseolus vulgaris L. was investigated. The present study showed that low concentrations of caffeine (<22.5 ppm) had no pronounced effect on the growth of bean seedlings and structure of shoot apical meristem, but higher concentrations of caffeine (40-60 ppm) had severe inhibitory effects. Electron microscopy (TEM and SEM) studies showed that apical meristem size and number of leaf primordia was decreased under caffeine treatment. Also in some meristem cells, formation of cell wall was incomplete. Present findings show that a lack of division in strategically located cells in primordia and during organogenesis could produce the organ abnormalities described. The observation that cytokinesis defects can be observed in developing primordial and meristems supports this.
  Homa Mahmoodzadeh , Ahmad Majd and Mehrdad Lahouti
  In the present research structure and ultrastructure of shoot apical meristem of canola (Brassica napus cv. Symbol) under salinity conditions were investigated. The experiments were conducted in five groups (0, 3, 6, 9, 12 dS m-1) under greenhouse conditions. Sampling of apical meristem and TEM tissue preparation procedure were carried out. Semithin and ultrathin sections were prepared and viewed in light and electron microscopy, respectively. The results included reduction of meristem size, disorders in meristem structure. Also formation of autophagic vacuoles was observed that is probably one of the plant responses to salt stress for more water storage in these vacuoles and decreasing of cell water requirements.
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