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Published Journal Articles



Pakistan Journal of Botany (Issue : 2) (Volume : 52)
Leaf physiological responses, chlorophyll content and stomata density of two cultivars Xestawi and Suranni (Olea europaea L.) transplants grown under two levels of light intensity (100% and 50%) of full light and different concentrations of calcium and boric acid (0.25% and 0.50%) and (50 and 100 mg.L 1) respectively were studied in addition to control. These studies aimed to discuss the effect of light intensity and some chemical compounds on some physiological responses of olive transplants [net photosynthesis, stomata transpiration, stomata conductance rates and water use efficiency (WUE), in addition chlorophyll a, chlorophyll b, stomata density and guard cell thickness]. The result showed that all above parameters significantly increased in 100% light intensity except in the case of water use efficiency, it decreased in 100% light intensity. While the effect of mineral compounds on all of the parameters were varied. The transplants treated with 100 mg.L 1 boric acid showed higher net photosynthesis, transpiration and stomatal conductance. Hence, higher rates of water use efficiency, stomata density, guard cell thickness and chlorophyll b were found in transplants treated with both concentrations of calcium (0.25% and 0.50%).

Use of leaf anatomy for identification of Quercus L. Species native to Kurdistan-Iraq

Science Journal of University of Zakho (Issue : 2) (Volume : 3)
Anatomical features of the leaves of Quercus L. species are presented in this study for the first time. Leaves are bifacial and the palisade parenchyma of Q. aegilops and Q. libani is stratified into two layers, of nearly equal width, while that of Q. infectoria and Q.macranthera composed of only one layer. The cortex of both midrib and petiole is well developed with collenchyma starting just beneath the epidermis. The collenchyma of Q. aegilops is extremly thick compared with that of other species. Vascular bundles of the midrib and petiole are completely enclosed by the two pericycle layers of fibers and sclerenchyma. While the number of vascular bundles and sclerenchyma groups cupping them is 3 and 2 for midribs of Q. aegilops and Q. libani respectively, the number turns into 2 vascular elements of different appearance in their petioles. Petiole secondary vascular bundles are well developed and their sclerenchyma groups more lignified in Q. infectoria but less developed and reduced in Q. macranthera. From the results, it is concluded that the leaf blade and petiole anatomical features can provide diagnostic characters for distinguishing Quercus species of Iraq. Results also strongly support placing Q. aegilops and Q. libani in the section Cerris but Q. infectoria is more reliable in the section Mesobalanus.