Showing 4 results for Germination.
M. Saeidi, A. Ahmadi, K. Postini, M. R. Jahansooz,
Volume 11, Issue 1 (4-2007)
Abstract
Soil moisture is one of the most important determinants of plant’s seed germination, emergence and finally yield formation in arid and semi-arid zone (e.g. IRAN). In such a situation, the selection of a cultivar resistant to drought is the most important task. In this regard, a research at three levels (Farm, Greenhouse, Laboratorial) was conducted to study 10 genotypes with three improved background including: Improved Indigenous(II) genotypes (Sardary, Roushan, Omid), Improved Indigenous Foreign Crossed (IIFC)(Azadi, Falat, Qods) and four Indigenous lines (IL)(5593/2-3, 6452-6, 5806-3, 7007/2-6). On the basis of our data with decrease of osmotic potential, seed vigor with high speed and slope in different genotypes decreased. In -0.8 MPa level of osmotic potential, Omid, Azadi and 5593.2-3 genotypes had the highest and Sardary, 5806-3 and Falat genotypes had lowest seed vigor. In -1.6 MPa level of osmotic potential seed vigor of all genotypes severely decreased and in this level of osmotic potential, no significant difference was observed among genotypes. The greater correlation between seed germination, vigor and emergence percentage in farm situation was obtained but the correlation between all germination characteristics in laboratory and farm situations with yield was not significant. Orthogonal analysis shows that II genotypes have greater seed vigor in comparison with other groups of genotypes, but did not show any significat difference among the three groups. The percentage and rate of germination.
F. Kamiab, A. Vesvaei, A. Ebadiand, B. Panahi,
Volume 11, Issue 41 (10-2007)
Abstract
This research was conducted in order to select male genotypes of pistachio with good performance. The study was performed on 10 genotypes in regard to their flowering time, pollen quantity and quality. The results indicated that flowering times of P1, P2 genotypes were simultaneous with Kallehghochi P3, P4, P5 genotypes with Ahmad Aghaii P6 and P7 genotypes with Ohadi and P8, P9, P10 genotypes with Akbari. Inflorescence weight showed big differences between them, ranging from 4.5gr for P6 to 1.66gr for P8. The amount of pollen per inflorescence also showed big difference, ranging from 71mg for P2 and 267mg for P5. In order to determine the percentage of pollen germination, a medium consisting of sucrose, agar and boric acid was used. The percentage of pollen germination also showed big difference, ranging from 30%for P3 and P4 and 85% for P10. Stored pollen at 4°C temperature showed 30% germination after one month and 0% germination after three months. The results also indicated that the percentage of pollen germination in culture medium without boric acid was lower, compared with other treatments. The viability of pollens collected from cutting inflorescences kept in water bottle was higher than that obtained from dried inflorescences maintained in room condition.
E Moharami, M Shahedi, M Kadivar,
Volume 13, Issue 47 (4-2009)
Abstract
Enzymes of wheat flour have an important role in production of various cereal products, especially bread, and therefore accurate measurement of enzymatic activity along with improvement of this characteristic is the basis of most studies in baking industry. In the present work, physical properties of three wheat varieties (Mahdavi, Kavir and M7318 that are cultivated in Isfahan province) and chemical characteristics of their flours were investigated. In order to study the changes in enzymatic activities (α-amylase, lipase and lipoxygenase), the activities of these enzymes were measured before and after germination. The relationship between root length and α-amylase activity was studied as well as the relation between lipase and lipoxygenase activities. α-amylase activity of flours was also optimized according to falling number 250 s. The effect of this optimization on the bread texture in four different times after baking, on the flour color in three different times, and on the flour acidity in two different times were then evaluated. The results of chemical measurements showed that M7318 and other two varieties can be considered as weak flours and medium flours, respectively, in terms of their protein and gluten contents. However, all varieties had low levels of α-amylase activity, although, kavir flour had more activity than the others. The results of germination tests indicated an increase in the activity of α-amylase and lipase, but not lipoxygenase. Moreover, during germination times a significant negative correlation between root length and falling number was found. Also, a significant positive correlation between root length and α-amylase activity and between activities of lipase and lipoxygenase was observed.
A. Shariat, M. H. Assareh, A. Ghamari-Zare,
Volume 14, Issue 53 (10-2010)
Abstract
Heavy metals including cadmium produced as a result of urban, industrial and agricultural activities lead to the water pollution. Also, considering the growing need for silviculture in Iran, it is necessary to conduct a comprehensive research on fast growing and evergreen species of Eucalyptus and their role in heavy metals' absorption. To achieve this goal, Eucalyptus occidentalis seedlings were grown in pots containing silica and irrigated with a mixture of nutrient solution and cadmium chloride in 5, 10 and 15 m M for 10 months. Root and leaf samples were harvested and the amount of cadmium in stem, root and leaf organs was measured. Also, some morphological and physiological characteristics were determined including soluble sugar and praline. The analysis indicated that the cadmium concentrations of 15 mM treatment in the root, leaf and stem were 585, 142 and 87 mg/kg D.W., respectively. Proline content increased with the increase of Cadmium concentration while the content of pigments decreased. The result of this research shows that eucalypt has the potential of cadmium accumulation without any serious damage to its growth. Therefore, the plant can be used to decrease the environmental pollutions.
