Masoumeh Ghahremani; Ali Ebadi; ghasem parmoon; Soodabeh Jahanbakhsh
Abstract
This study was carried out to evaluate the changes in some important cell parameters under water limitation in sorghum genotypes. A factorial experiment was conducted based on randomized completely design in greenhouse, in University of Mohaghegh Ardabili in 2014. Treatments were water stress at levels ...
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This study was carried out to evaluate the changes in some important cell parameters under water limitation in sorghum genotypes. A factorial experiment was conducted based on randomized completely design in greenhouse, in University of Mohaghegh Ardabili in 2014. Treatments were water stress at levels of 85, 65, 45 and 25 percent field capacity in and three genotypes of forage sorghum (KFS2, KFS6 and KFS17). The results showed that water stress reduced the osmotic potential, relative water content, cell membrane stability redecase in one percent, also the amount of potassium, calcium, phosphorus, while increased sodium content and finaly decreased biomass. Interaction between stress and genotype only proline, soluble sugars, cell membrane stability, relative water content and biomass was statistical difference. KFS2 genotype had the highest amounts of proline, soluble sugars and nutrients, higher osmotic potential, relative water content, cell membrane stability and biomass in most severe stress levels (25 percent of field capacity). The highest contribution between proline and calcium amount for osmotic potential and membrane stability prediction. These factors also play an important role in biomass production. In general we can say the genotypes used for different mechanisms to deal with stress, however, the genotypes which use faster and less expensive methods are able to have greater tolerance to stress and will a higher yield produce.
Nafiseh Asadi nasab; Payman Hassibi; Habibollah Roshanfekr; Moosa Meskarbashi
Abstract
To study some physiological and morphological traits of sugar beet varieties in response to salinity stress, three multi-germ sugar beets (13030, 22393 and IC) were grown in the greenhouse, Faculty of Agriculture, Shahid Chamran University, in 2009. The experiment was carried out under three levels of ...
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To study some physiological and morphological traits of sugar beet varieties in response to salinity stress, three multi-germ sugar beets (13030, 22393 and IC) were grown in the greenhouse, Faculty of Agriculture, Shahid Chamran University, in 2009. The experiment was carried out under three levels of salinity in from of sodium chloride source, that included control (zero), 100 and 200 mM uses factorial design test based on a randomized complete block with three replications. Seeds were sown in plastic pots and salt treatments were begun 30 days after sowing. After 60 days salt treatment, the plants were harvested and analyzed. The analysis of variance results showed that salinity had significant effect on all of the parameters. The results of mean comparisons showed that by increasing salinity, root dry weight, shoot and leaf area significantly decreased, but salinity had not significant effect on the leaf number. Indeed, by increasing of salinity, the relative water content of leaf and stomatal conductance were decreased, while, the relative membrane permeability and proline content in leaves of all genotypes increased. Higher concentrations of sodium chloride decreased osmotic potential. An increase of proline neither affected electrolyte leakage nor plant water status. Therefore, in sugar beet, the antioxidant role of proline could not provide plasma membranes protection against damage caused by salt stress. According to this study, root dry weight of 90 days plants, sis was related to drought tolerance in the three varieties studied.
Maryam Haghighi; Hossein Behboudian
Volume 13, Issue 1 , August 2011, , Pages 1-8
Abstract
The world is facing a dwindling supply of water, therefore deficit irrigation is becoming more of a necessity than a choice. Partial rootzone drying (PRD) is a new water saving irrigation technique where at each irrigation time only one part of the rootzone is watered. The un-irrigated part is watered ...
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The world is facing a dwindling supply of water, therefore deficit irrigation is becoming more of a necessity than a choice. Partial rootzone drying (PRD) is a new water saving irrigation technique where at each irrigation time only one part of the rootzone is watered. The un-irrigated part is watered during the next irrigation. We explored the potential of PRD for `Petopride´ processing tomato. There were two treatments: control (C, normal irrigation) and PRD. We collected data on water relations of vegetative and reproductive organs. PRD saved water by 50% and increased water use efficiency of the plant compared to C. Leaf water potential was more negative under PRD compared to C. Irrigated and non-irrigated roots of PRD had similar water potential and this could have happened by water movement between the two sides of root system. Water potential of fruit was lower in PRD than in C. But pressure potential (turgor potential) was similar between PRD and C fruit. This was indicative of osmotic adjustment (osmoregulation) in PRD fruit. To our best knowledge, this is the first report of osmotic adjustment of fruit under PRD treatment.