Showing 7 results for Chlorophyll Index
Ms Kobra Abdollahi, Dr Behrooz Esmaielpour, Dr Surur Khorramdel, Dr Sasan Rastgo, Ms Ghassem Parmoon,
Volume 6, Issue 21 (11-2017)
Abstract
In order to investigate the effects of simultaneous application of vermicompost and putrescine on reproductive characteristics and biochemical traits of greenhouse cucumbers greenhouse cv Yalda a factorial Pot experiment, based on completely randomized design with three replications was conducted in of Mohaghegh Ardabili University in 2014. Experimental treatments include Substrates containing different percentages of vermicompost (0, 20, 40 and 60 percentage) and different concentrations of putrescine (0, 0.5, 1 and 1.5 mM). Results showed that interaction of vermicompost and putrescine spraying were significant for all of traits except fruit number and days to flowering. As increases in vermicompost percentage medium in basal ,growth indices were significantly increased compared to control so that the highest yield was obtained by combination of 40% vermicompost and spraying 1 mM of putrescine. In bed containing 60% vermicompost the yield was reduced due to salinity effects of salt accumulation in organic matters. Sprayings with 1 mM putrescine via increases in proline content, protein and solube sugar partially compensated growth reduction resulted from salinity in beds containing high rate of vermicompost.
Raouf , Younes Kheirizadeh ,
Volume 7, Issue 26 (11-2018)
Abstract
In order to study the effects of bio fertilizers and zinc application on yield, variations of quantum yield, stomatal conductance and some physiological traits of triticale under water withholding conditions, a factorial experiment was conducted based on randomized complete block design with three replications. Experimental factors were included water withholding in three levels (normal irrigation as control, irrigation withholding at 50% of heading stage, irrigation withholding at 50% of booting stage), four bio fertilizers levels (no bio fertilizer, application of mycorrhiza, Azotobacter chrocoocoum strain 5 + Psedomunas putida strain 186, application of PGPR and mycorrhiza together) and four nano zinc oxide levels (without nano zinc oxide as control, application of 0.3, 0.6 and 0.9 g L-1). Results showed that under water withholding condition, photochemical efficiency of photosystem II, chlorophyll index, stomatal conductance, relative water content and grain yield decreased. Whereas, electrical conductivity and grain protein were increased. Means comparison showed that the highest of grain yield, photochemical efficiency of photosystem II, stomatal conductance, relative water content and chlorophyll index were obtained at application of PGPR+mycorrhiza, foliar application of 0.9 g L-1 nano zinc oxide and full irrigation. The highest of grain protein was belonged at application of PGPR+mycorrhiza, foliar application of 0.9 g L-1 nano zinc oxide and irrigation to 50% of booting stage. The highest of grain yield (663.26 g m-2) was obtained at application of PGPR+mycorrhiza, foliar application of 0.9 g L-1 nano zinc oxide and full irrigation and the lowest of it (198.46 g m-2) was belonged at irrigation to 50% of booting stage, no biofertilizers and without nano zinc oxide. Irrigation withholding in heading and booting stages reduced 22% and 42% respectively from grain yield and using of biofertilizers and nano zinc oxide compensated 52% and 53% respectively from yield reduction. It seems that application of biofertilizers and nano zinc oxide due to the improvement of some physiological traits such as photochemical efficiency of photosystem II, chlorophyll content, stomatal conductance and relative water content can be recommended for profitable triticale production under water withholding condition.
Mrs Sima Joorabi, Dr. Hamid Reza Eisvand, Dr. Ahmad Ismaili, Dr. Ali Heidar Nasrolahi,
Volume 9, Issue 35 (4-2020)
Abstract
In order to the investigation of Zn nano-chelate foliar application effects on photosynthetic parameters, glutamine synthetase, protein, grain yield and yield components of soybean under water deficit, a split-plot experiment was conducted as a randomized complete block design with three replications at Research Farm, Faculty of Agriculture, University of Lorestan, in 2016. The treatments consisted of irrigation regime (100, 80, 60 and 40% of plant water requirement) in the main plots and zinc nano-chelate foliar application (Control or distilled water and zinc as zinc nano-chelate containing 20% zinc absorbable ion) in the subplots. The results showed that by decreasing of water requirement some traits such as photosynthesis, transpiration, stomatal conductance, glutamine synthetase, the number of pods per plant, the number of grain per pod, 100-grain weight, grain yield, protein percentage of grain and protein yield were reduced. In contrast, internal CO2 concentration (Ci) and SPAD value increased in stress condition. In normal condition, zinc nano-chelate treatment was not any effect on SPAD value, the number of seed per pod, 100-seed weight, seed and protein yield. In water deficit conditions, zinc nano-chelate foliar application increased the mentioned traits by 4.2, 13.8, 17.3, 45.7 and 39.3 percent, respectively. In addition, in water deficient, zinc nano-chelate decreased Ci and stomatal conductance of leaves. In general, zinc nano-chelate application mitigated effects of water deficit and it was positive for improving soybean yield. Therefore, its application may improve tolerance of soybean.
Ali Akbar Asadi, Akram Hatami,
Volume 10, Issue 41 (4-2021)
Abstract
Abstract
Terminal drought stress is one of the most important environmental stresses affecting plant morphology and physiology and has major effects on agricultural production. The purpose of this experiment was to investigate the effect of water deficit stress on changes in physiological traits of wheat in a randomized complete block design with three replications in two cultivation years of 2013-2014 and 2014-2015 at Karaj Nuclear Research Institute Farm. Seven different generations of wheat, including two parents Gasspard and line DN11 along with generations F1, F2, F3, BC1 and BC2 were cultured and compared separately under normal and terminal drought stress conditions. The last irrigation was done under water deficit conditions after anthesis. The results showed that there was significant increase in performance index and significant decrease in single plant yield under stress conditions. For the chlorophyll index and stomatal conductance coefficient traits, the observed decrease in stress conditions were not significant. On the other hand, no significant increase in chlorophyll fluorescence parameters was observed under stress conditions.On the other hand, there was a significant difference between the generations studied for all measured physiological traits (except photosynthetic efficiency), indicating that there was variation among these generations for these traits. This diversity can be addressed in selection programs.
Milad Karimi, Hanifeh Seyed Hajizadeh, Seyed Morteza Zahedi, Sahar Azizi,
Volume 12, Issue 53 (5-2023)
Abstract
In order to investigate the effects of nanosilicon in salinity stress amelioration in miniature garden rose 'Sanaz' a factorial experiment as a completely randomized design were done with three replications at greenhouse of University of Maragheh in 1399. At the present study for improving in quantitative, qualitative and biochemical traits of miniature garden roses under salt stress (0, 25 and 50 mM NaCl), SiO2-NPs spray were used at different levels (0, 50, 100, 150 and 200 mg L-1). Results showed that all measured traits were decreased severely at 50 mM salinity compared to controls and the least amount of each parameter were recorded at 50 mM level of salinity. While SiO2-NPs spray at 50 mM salinity caused to preserve chlorophyll index and led to increase in the number of plant leaves (62.4%), maximum florescence (55.4%) and variable florescence (more than 3 folded). Also, SiO2-NPs spray decreased the minimum florescence (44%) at 50 mM salinity. Nanosilicon by stimulating growth and increasing in the activity of the antioxidant enzymes resulted in a decreased lipid peroxidation, malondialdehyde amount and, subsequently decreased oxidative stress in plant cells. Spray of nanosilicon under salinity stress, increased the amount of proline and decreased the oxidative damage to the protein. It seems that according to the present results foliar application of SiO2-NPs especially at 200 mg L-1 under salinity stress can be recommended in garden roses.
Hamed Narimani, Raouf Seyed Sharifi, Mohammad Sedghi,
Volume 13, Issue 59 (4-2024)
Abstract
In order to study the effects of mycorrhiza, vermicompost and putrescine on the morpho-physiological characteristics of triticale (Triticosecale Wittmack) under salinity stress, an experimental as factorial was conducted based on a randomized complete block design with three replications at the research greenhouse of the Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabil, during 2021–2022. The experimental factors were included salinity in three levels (no salinity as a control, 60 and 120 mM salinity from NaCl), biofertilizers in four levels (no application of biofertilizers as a control, application of vermicompost, Mycorrhiza, both applications of vermicompost and Mycorrhiza), and foliar application of putrescine (foliar application with water as a control, foliar application of 0.4 and 0.8 mM). The results showed that minimum of leaf electrical conductivity and minimum fluorescence were observed in the application of mycorrhiza with vermicompost and foliar application of 0.8 mM putrescine under no salinity conditions. Also, this treatment combination increased chlorophyll index (40.75%), relative water content (37.7%), stomatal conductance (43.85%), variable fluorescence (120.21%), maximum fluorescence (45.46%), quantum yield (51.37%), and grain yield (38.7%) in comparison with the no application of biofertilizers and putrescine under the highest salinity level (120 mM). Based on the results, the application of biofertilizers (mycorrhiza and vermicompost) and putrescine can increase the grain yield of triticale under salinity stress due to improving chlorophyll fluorescence indices and other physiological traits.
Alireza Mohammadjanlou, Raouf Seyed Sharifi,
Volume 13, Issue 62 (10-2024)
Abstract
In order to study the effects of mycorrhiza and humic acid on compatible osmolytes, stomatal conductance, antioxidant enzyme activity, and some traits of bread wheat under water limitation conditions, an experiment as factorial was conducted based on a randomized complete block design with three replications at the research farm of the Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili in 2018-2019. Factors experiment included irrigation at three levels (full irrigation, irrigation withholding at 50% of heading and booting stages as moderate and severe water limitations (BBCH 43 and 55, respectively) and application of mycorrhiza and humic acid at eight levels (application of Glomus intraradices, Glomus moseae, both applications G. intraradices and G. moseae, humic acid, humic acid with G. intraradices, humic acid and G.moseae, humic acid with G. intraradices and G. moseae, without humic acid, G. moseae and G. intraradices as control). Means comparison showed that both application of G. intraradices and G. moseae with humic acid increased stomatal conductance and relative water content (60 and 47.1%, respectively) compared to no application of mycorrhiza and humic. Also, under severe water limitation conditions, the activities of catalase, peroxidase, and polyphenol oxidase enzymes, along with grain yield, increased by 38, 25.4, 83 and 24% as compared to the uninoculated plots with no humic acid application at the same irrigation level.
