1,343 publications from this institution
Thirty-four faba bean (Vicia faba L.) including local and exotic materials were subjected to molecular diversity assessment using 12 inter-simple sequence repeat primers. The molecular data showed unambiguous and qualitative (present or absent) fragments that gave repeatable patterns were considered for the analysis. The 12 selected primers produced a total of 71 fragments (loci), all of which were polymorphic using the 34 collected faba genotypes. The results of clustering Nei’s genetic distance using the unweighted pair group method with arithmetic average algorithm at the 0.52 dissimilarity separated genotypes to six main clusters with many subclusters. The local genotypes were distributed to most of all clusters. Genotypes collected from Egypt and King Saud University was grouped together in two clusters, ICARDA’s genotypes in two clusters and two genotypes (H8, local determent genotype and 987–255–95 line) formed a single cluster. The high number of subclusters formed in this study indicated that there is a high genetic variability related to collection sites and it should be utilised in faba bean improvement.
Roots in waterlogged soils experience low O2 and often high CO2.<br/>Comparative responses of waterlogging-sensitive chickpea and<br/>-tolerant faba bean to high root-zone CO2 concentrations were studied<br/>in hydroponics. Plants were raised in aerated nutrient solution for 13<br/>days and then continued with aeration without additional CO2 or with<br/>2, 4, and 8% CO2 for 10 days. Some plants were also transferred to<br/>deoxygenated stagnant 0.1% agar nutrient solution. After 10 days of<br/>treatments some plants were shifted back to aerated solution to assess<br/>recovery for 7 days. Both genotypes showed sensitivity to CO2. Primary<br/>root growth, lateral root elongation and relative growth rate of roots<br/>all decreased progressively as the CO2 concentration was increased.<br/>In both genotypes, primary root porosity was only increased when in<br/>stagnant conditions and not when under high CO2 in aerated solution.<br/>There was a significant reduction in root respiration at 8% CO2 in both<br/>genotypes (not tested at the lower CO2 concentrations); respiration was<br/>in chickpea 61% of control and in faba bean 72% of control. In both<br/>genotypes there was an increase in root sugars at 8% CO2, so substrate<br/>was presumably not limiting respiration. Upon recovery, both genotypes<br/>showed only partial and delayed recovery of root growth from both high<br/>CO2 and from the stagnant treatment. This study on these two grain<br/>legumes adds to data in the literature on soybean, and shows that<br/>even if roots can access some O2, the high CO2 accumulation under<br/>waterlogging might also contribute to growth reductions.
