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Articles by Y. Emam
Total Records ( 3 ) for Y. Emam
  M.R. Safizadeh , M. Rahemi , E. Tafazoli and Y. Emam
  The aim of present study to determine the effect of postharvest vacuum infiltration with CaCl2 on Chilling injury, firmness and quality of Lisbon lemons [Citrus limon (L.) Burm.] at the yellow-green state, were treated with CaCl2 solutions up to 7.5% (w/v) by normal vacuum infiltration (NVI, 15°C, -33 kPa, 10 min), or hot vacuum infiltration (HVI, 45°C, -33 kPa, 10 min) before storage at 1.5°C and 85-90% RH for 6 and 12 weeks and 1 additional week at 20°C. Vacuum infiltration maintained firmness best following 6 weeks, but reduction in the Chilling Injury (CI) index observed following 12 weeks of cold storage and additional week at 20°C. By both infiltration regimes, the different concentrations of CaCl2 only affected CI, weight loss and firmness of fruit, but did not alter other parameters. Among the treatments, NVI at 1.5% CaCl2 and hot water infiltration alone (45°C, -33 kPa, 10 min) were the most effective and reduced the severity of CI by 53.2 and 19.3%, respectively. The fruit treated with 7.5% CaCl2 by NVI and ≥4.5% CaCl2 by HVI showed significantly lower values of deformation (more firmness) than non-treated ones. Combination of CaCl2 and hot water (HVI) increased the efficiency of CaCl2 in terms of firmness retention, but had no additive effects in reduction of CI. As compared to NVI, HVI increased CI index and the rate of K+ leakage and decreased total soluble solids and acidity levels of fruit. A significant correlation was also found between CI index and each of other parameters. As CI increased, weight loss and ion leakage increased too, but ascorbic acid and acidity levels decreased. Similar trends were observed as the storage period advanced and CI increased.
  E. Bijanzadeh and Y. Emam
  To investigate the effect of source-sink manipulation on photosynthetic characteristics and yield components of wheat cultivars, a research was carried out in the greenhouse at the College of Agriculture, Shiraz University, Shiraz, Iran, during 2008-2009 growing season. Five wheat cultivars including Shiraz, Bahar, Pishtaz, Sistan (as bread wheat) and Yavaros (as durum wheat) were grown in 5 kg plastic pots. The source-sink manipulation treatments including defoliation of all leaves, defoliation of all leaves except the flag leaf, removal of 25% of spikelets and removal of 50% of spikelets were applied at anthesis. Results showed that number of grains per spike was significantly decreased by defoliation treatment in Shiraz, Bahar and Yavaros cultivars, so that in Shiraz and Bahar cultivars, source restriction reduced the number of grains per spike by 18.97 and 11.07%, respectively. In Shiraz cultivar, defoliation of all leaves decreased main stem grain yield by 40.75%, which demonstrated that Shiraz was very sensitive to source restriction. The little response of main shoot grain yield to defoliation in Pishtaz cultivar indicates high mobilization of photoassimilate from other parts of the crop to the grains. Under sink restriction conditions, wheat cultivars (except Pishtaz) had potential to increase their 100-grain weight; moreover, Pishtaz yield appeared to be more sink rather than source-limited. Removal of all leaves except the flag leaf at 8 and 18 DAA, in Pishtaz and Yavaros cultivars, had no significant effect on net photosynthesis rate (Pn) and in all cultivars except Pishtaz, sink restriction significantly decreased Pn rate. Further research, is recommended for improving our understanding on source-sink relationship in Iranian wheat cultivars.
  E. Bijanzadeh and Y. Emam
  In order to examine the effects of source restriction and drought stress on yield components, flag leaf chlorophyll content and Relative Water Content (RWC) of wheat cultivars, a greenhouse experiment was carried out at Shiraz University, Shiraz, Iran, during 2009-2010. The wheat cultivars including Shiraz, Bahar, Pishtaz, Sistan and Yavaros were sown in 5 kg plastic pots. The source manipulation treatments including control (C), defoliation of all leaves (D1), defoliation of all leaves except the flag leaf (D2) and defoliation of all leaves except the flag leaf and penultimate leaf (D3), were imposed at anthesis. Results showed that source restriction decreased number of grain per spike significantly in Shiraz cultivar under drought stress condition. Maximum 100-grain weight was observed in C treatment of Yavaros and Shiraz under well-watered condition. Among the defoliation treatments under drought stress condition, D2 in Pishtaz and D1 in Shiraz had the highest (3.66 g) and lowest (2.71 g) 100 grain weight, respectively. In all cultivars drought stress decreased main shoot yield significantly but in Pishtaz and Sistan decreasing rate was less than the other cultivars. RWC in Shiraz decreased sharply from 92.1% in well-watered to 66.7% (27.5% reduction) under drought stress at 10 DAA. After anthesis, Pishtaz and Sistan maintained higher content of flag leaf chlorophyll (from 49.4 to 56.8 SPAD unit) under drought stress condition. Generally, selection and culture of cultivars that had small responses to defoliation might be a useful strategy in yield improvement of wheat in areas where the water availability is low.
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