HOSEIN nAZARLI; ali naderi arefi
Abstract
Objective: In order to improve the tolerance of German chamomile cultivars to moisture regimes, this factorial experiment was conducted in a randomized complete block design in three replicates, in the agricultural college of Tehran university in 2013-14 cropping season.
Methods: Experimental treatments ...
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Objective: In order to improve the tolerance of German chamomile cultivars to moisture regimes, this factorial experiment was conducted in a randomized complete block design in three replicates, in the agricultural college of Tehran university in 2013-14 cropping season.
Methods: Experimental treatments included moisture regimes (control and severe stress, i.e., 13% and 57% of allowable soil moisture depletion, respectively), two cultivars of chamomile (German Badgold and Hungarian modified cultivar) and foliar application with putrescine (with a concentration of 0.1 mM and 45 days after transfer to the pots).
Results: The results showed that the simple effect of putrescine polyamine on plant height and biomass was significant at 1% level and on harvest index at 5% level. Plant height did not have a significant response to putrescine in control conditions, but in severe stress (57% of soil water depletion), the effect of foliar application showed a significant boost (13.5%). The simple effect of putrescine on percentage and essential oil yield (at 1% level) was significant. Also, the interaction effect of moisture regimes and foliar application with putrescine on essential oil content (at 5% level) and essential oil yield (at 1% level) was considerable. Under optimal moisture conditions (13% of soil water depletion), putrescine resulted in a significant increase in essential oil content by 38%. But its foliar application in drought stress increased the essential oil content by only 4%. Foliar application of putrescine reduced the amount of farnesene and bisabolol B oxide in both conditions. Another important compound was bisabolone oxide A, wherein putrescine treatment had a positive effect on its accumulation so that under favorable conditions of moisture its concentration increased by 87%, but under conditions of stress its effect decreased, showing only 35%.
Conclusion: The use of putresin in chamomile is economically justified due to increased tolerance to dehydration stress and increased target secondary metabolites.
alireza mohseni; Raouf Seyed sharif; saeid khomari
Abstract
In order to study the effect of bio fertilizers and putrescine on yield and some traits of wheat (Triticum aestivum L.) at various irrigation levels, a factorial experiment was conducted based on randomized complete block design with three replications at the research farm of University of Mohaghegh ...
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In order to study the effect of bio fertilizers and putrescine on yield and some traits of wheat (Triticum aestivum L.) at various irrigation levels, a factorial experiment was conducted based on randomized complete block design with three replications at the research farm of University of Mohaghegh Ardabili, during 2018-2019. The factors include irrigation (full irrigation as control, irrigation withholding at 50% of heading and booting stages), bio fertilizers (no bio fertilizer, application of mycorrhiza, both application Psedomunas and Flavobacterim, application of mycorrhiza with Psedomunas and Flavobacterim) and putrescine foliar application (foliar application with water as control, foliar application with 0.5 and 1 mM of putrescine). Comparison of the means showed that the maximum amount of relative water content of flag leaf; chlorophyll index, stomatal conductance and quantum yield were obtained in full irrigation, application of mycorrhiza with Psedomunas and Flavobacterim and foliar application 1 mM of putrescine. Foliar application 1 mM of putrescine increased grain yield of about 8.5% in comparison with no application of putrescine. Also, the highest grain yield (799.44 and 746.38 g.m-2) were obtained with application of both Psedomunas and Flavobacterim, as well as application of mycorrhiza with Psedomunas and Flavobacterim, respectively under full irrigation conditions. In the meantime, the lowest (403.42 g.m-2) belongs to the treatment under irrigation withholding in booting stage, without the application of bio fertilizer. It seems that application of putrescine and bio fertilizers can increase grain yield of wheat under water limitation conditions as it improves some physiological traits.