Bijan Mehregan; Sadegh Mousavi Fard; Abdolhossein Rezaei Nezhad
Abstract
The present study aimed to investigate the effect of silicon (Si) on alleviation of the drought-reverse effects in two Althernanthera genotypes “Entire leaf” and “Undulated leaf”. Pot experiment, consists of equal parts of soil, sand and manure, was carried out as factorial based ...
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The present study aimed to investigate the effect of silicon (Si) on alleviation of the drought-reverse effects in two Althernanthera genotypes “Entire leaf” and “Undulated leaf”. Pot experiment, consists of equal parts of soil, sand and manure, was carried out as factorial based on a completely randomized design with six replications. After plants establishment, 0, 1 and 2 mM of silicon were weekly sprayed on plants grown under drought stress conditions (90% field capacity (FC), 75 and 55 percent FC). Si treatment started one week before the beginning of drought stress. Samples were taken after 12 weeks of treatment. The analysis of variation showed that increasing drought stress significantly affected all morphological (plant height, stem diameter and root length), physiological (fresh and dry weight of stem and root, relative water content, electrolyte leakage) and biochemical (chlorophyll a, chlorophyll b, total chlorophyll, proline and anthocyanin) characteristics. Whereas, silicon application (especially with 2 mM concentration) alleviated the stress effects and improved growth parameters. Electrolyte leakage as an indicator of cell membrane integrity was decreased by application of silicon. Results of this study showed that different varieties have the variable resistance to stress. In this study, “Undulated leaf” genotype was more resistant compared to “Entire leaf”. So, it can be cultivated in gardens in areas where the water scarcity is prevalent.
Zeinab Fathi Manesh; Abdolhossein Rezaie Nejad; Sadegh Mosavi Fard; Gholamhasan Veikarami
Abstract
In order to evaluate the adaptation and ornamental potential of Allium spp endemic to Iran, an experiment was conducted in Agricultural Research Station of Lorestan University under Khorramabad climatic conditions during 2014-2015. A completely randomized design was used for the experiment with 21 treatments ...
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In order to evaluate the adaptation and ornamental potential of Allium spp endemic to Iran, an experiment was conducted in Agricultural Research Station of Lorestan University under Khorramabad climatic conditions during 2014-2015. A completely randomized design was used for the experiment with 21 treatments (species-location) with three replications. Phonological and morphological characteristic at growth stage was recorded. Analysis of variance showed significant (p<0.01) differences among species on all traits indicating genetic diversity of the studied species. Cluster analysis and principle component analysis were used to assess the ornamental potential of the studied species and the most important ornamental characteristics i.e. scape length, the diameter of the inflorescence, flower longevity and flower color were evaluated. Biplot were depicted on the basis of both the first and second component that showed 54% of variations. In the biplot and cluster analyses, the species were placed into distinct groups associated with their potential ornamental value. According to the results, Allium iranicum collected from the Alborz-Dizin with large inflorescence (63.28 mm), beautiful flower color (purple) and being green in winter, and Allium oschaninii species collected from Khorasan-Chenaran with great flower longevity (54 d), beautiful form and large scape length (95 cm) were identified as good potent ornamental species.