anatomical and histomorphometrical study of sheep’s thymus was conducted by 75 apparently healthy fetuses that collected from urmia’s industrial slaughterhouse. after anatomical study, the samples were fixed in 10% formal saline, passaged and histological paraffin sections prepared in 5-7 μm in thickness, and by h&e; method stained. histomorphometrical study performed by graded and latticed len...

PREMISE OF THE STUDY A recent commentary by Edwards et al. (Am. J. Bot. 103: 975-978) proposed that constraints imposed by the packing of young leaves in buds could explain the positive association between non-entire leaf margins and latitude but did not thoroughly consider alternative explanations. METHODS We review the logic and evidence underlying six major hypotheses for the functional si...

In this study the effects of drought stress on proline, protein, chlorophyll a/b, ascorbate and dehrydroascorbate were investigated in Akri and Mobil cultivars of tomato species. The seeds were cultured at 23 °C with 15-16 hours light period and irrigation was done based on field capacity control (FC), mild drought stress (⅔ FC) and severe drought stress (⅓ FC) under greenhouse conditions. Afte...

Response of tea plants to B deficiency was studied in hydroponic medium under environmentally controlled conditions. Plants height, number of leaves and dry matter production of shoot and root were significantly decreased by B deficiency. Concentration of chlorophyll, carotenoids, anthocyanins and flavonoids was not affected by B deficiency in the young leaf, while a significant reduction of Ch...

in order to determine the effects of zinc foliar application on the vegetative characteristics, yield and fruit quality in strawberry (fragaria × ananassa duch) cv kordestan under salinity stress conditions, an experiment was carried out hydroponically in glasshouse as a controlled environment during 2009 through 2010. three levels of nacl (0, 15, 30 mm) and three levels of zn (0, 1.5, 3 g/l) w...

Plants adopt a series of strategies to tolerate solar UV-B radiation (with the side effects growth reduction), but positive have not been yet clarified. In this study, two cultivars with different leaf thickness for Chestnut rose (Rosa roxburghii Tratt), pioneering species ecological restoration in Karst region Southwest China, were employed investigate its responses ultraviolet-B (UV-B) exclus...

Although leaf toughness is an essential plant adaptation to herbivore pressure and environmental stress, the relationships of with anatomy photosynthetic traits, its spatial variations within tropical rainforests, remain poorly understood. We measured these traits in 103 tree species belonging 27 families from canopy understory using a crane system rainforest Sarawak, Malaysia. focused on anato...