M. Hassanpour Asil, Z. Roein, A. Sabouri,
Volume 5, Issue 2 (Journal of Science and Technology of Greenhouse Culture 2014)
Abstract
Chrysanthemum is one of the most important ornamental and medicinal plants in the world. In this study, diversity among 50 genotypes of chrysanthemum morifolium was analyzed using phenologic and morphologic traits. The variation between studied genotypes showed a significant difference for all traits and coefficient of genetic variations for most traits was greater than 40%. The highest general heritability belonged to days to bud coloring (h2=90.59%) and post-production longevity (h2=88.3%). The lowest heritability (h2=6.05%) was related to disc floret opening. In multiple linear stepwise regression for flower longevity as the dependent variable, such traits as number of days to bud coloring, days to full bloom and pollen shed entered the model. Therefore, vegetative growth period and behavior of florets affect post-production longevity. On the other hand, cluster analysis according to the morphological traits using Ward method classified all the studied genotypes into six groups. In this classification, two genotypes of “Afrooz” and ‘Unknown1’, with short vegetative period, late pollen shed and high post-production longevity were classified into a separate cluster. The findings of this research showed that the studied Chrysanthemum genotypes have desirable genetic potential, and depending on the objectives, most of them could be used in breeding programs to improve different traits.
J. Abbasi, M. Hassanpour Asil, J. A. Olfati,
Volume 11, Issue 1 (Journal of Science and Technology of Greenhouse Culture 2020)
Abstract
Melatonin has different physiological functions in plants, such as active growth regulator signal. A factorial experiment, based on randomized complete blocks design, was carried out in order to evaluate of the effect of melatonin and sodium nitroprusside (SNP) on morpho-physiological traits of cut flower Gerbera (Gerbera jamesonii cv. Malibu) under salinity stress. The first factor in this experiment was melatonin and SNP at 5 levels (control (without melatonin and SNP), 0.1 mM melatonin + 0 SNP, 0.1 mM melatonin + 10 µM SNP, 0.2 mM melatonin + 0 SNP, 0.2 mM melatonin + 10 µM SNP) and the second factor consisted of irrigation water with two levels of electrical conductivity (i.e., 2 and 4 dS/m). The studied traits consisted of soluble solids, cell membrane stability, leaf, shoot and root water potential, water use efficiency, reduced glucose, different kinds of chlorophyll, carotenoid, proline, superoxide dismutase, catalase, ascorbate peroxidase, polyphenol oxidase and total protein content. Based on the means’ comparisons, 0.1 mM melatonin + 10 μM SNP, 0.2 mM melatonin + 0 SNP and 0.2 mM melatonin + 10 μM SNP treatments had the highest membrane stability at 2 dS/m salinity level, and with increasing the salinity level to 4 dS/m, the membrane stability decreased. The amounts of chlorophylls a, b and total in the 0.1 mM melatonin + 10 μM SNP, 0.2 mM melatonin + 0 SNP and 0.2 mM melatonin + 10 μm SNP were significantly higher than control and 0.1 mM melatonin treatments. The amounts of SOD, CAT, and APX enzymes increased when combined with melatonin and SNP in comparison to the control. Therefore, melatonin and SNP can be recommended as an effective and very useful combination in the resistance of gerbera cut flower to salt stress conditions.
