جستجوی مقالات مرتبط با کلیدواژه « جذب فسفر » در نشریات گروه « باغبانی »

Phosphorus deficiency and drought stress are limiting factors in wheat yield. Drought stress has different effects on the uptake, utilization and use efficiency of soil phosphorus in wheat cultivars. The purpose of this study is to investigate the response of growth and development, uptake and efficiency of phosphorus in Sirvan and Sivand wheat cultivars at three moisture stress levels of 50, 70 and 95% of soil field capacity (FC) and two phosphorus levels of 0 and 25 mg kg-1. The results showed that addition of phosphorus increased shoot dry weight, phosphorus utilization efficiency, root length and area, and soluble sugars by 42, 61, 84, 47, and 66%, respectively, and decreased electrolyte leakage by 64% under stress conditions of 50%FC. Besides, the phosphorus application of 25 mg kg-1 under drought stress conditions of 50%FC increased the shoot dry weight of the Sirvan variety by 75% compared to the Sivand variety. This increase can be due to the effect of phosphorus on metabolic activities inside the plant, which has led to an increase in root growth, soluble sugar production and cell wall resistance, and a decrease in electrolyte leakage. Therefore, the positive changes observed in different traits and indices due to the use of phosphorus increased the resistance of the Sirvan cultivar compared to Sivand under drought stress conditions. According to the results of phosphorus efficiency and some root morphological and physiobiochemical characteristics, Sirvan cultivar showed a good response to phosphorus fertilizer in modulating the effect of drought stress.

In order to investigate phosphorus efficiency (PE) of the barley genotypes in the presence of phosphate-solubilizing microorganisms (PSMs)، a greenhouse factorial experiment was conducted as a completely randomized blocks design and 3 replications with 10 Iranian and foreign barley genotypes. The effects of different phosphorus (P) fertilizer treatments including control (P0)، phosphate rock (RP)، phosphate rock inoculated with phosphate solubilizing fungi (RP+F)، phosphate rock inoculated with phosphate solubilizing bacteria (RP+B)، phosphate rock inoculated with both fungi and bacteria inoculum (RP+B+F)، and soluble phosphate (PS) was studied. After 9 weeks، plants were harvested and shoot dry weight (SDW) and P concentration (PC) was measured and then PE indices were calculated. The results indicated that barley genotypes had significant differences (P<0. 01) in the SDW، PC، P content (TP)، P acquisition efficiency (PACE) and P utilization efficiency (PUTE). Gara-arpa genotype and line AltICB-98 produced the highest and Rihane-03 genotype produced the lowest shoot dry mass at the P-free treatment (P0). The inoculation with PSMs significantly increased plant growth parameters and PACE as the fungi inoculation was more effective than bacteria and mixed inoculation of fungi and bacteria. With fungi inoculation، the average PC increased from 1. 58 to 2. 9 mg/g SDW، PACE from 0. 12 to 0. 27 and PE from 0. 40 to 0. 69. Among the varieties، Yea-168 was efficient in P acquisition، Sahand was efficient in P utilization، and Gara-arpa and line AltICB-98 were efficient in both acquisition and utilization of P. Thus، it is concluded that selecting P-efficient varieties along with inoculation by phosphate-solubilizing microorganisms could decrease application of chemical fertilizers due to increasing P absorption from phosphate rock and insoluble forms of P in the soil.