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Current assimilation, as a source of carbon for grain filling in cereals, may be limited for normal grain filling under Mediterranean climate. In such conditions reserves accu-mulated before anthesis play an important role in grain growth, but the extent of their contribution depends on prevailing environmental conditions. The experiment described here was carried out to determine the effects of different levels of water stress on dry mat-ter and nitrogen accumulation and their remobilization from the shoot to the grain. The pot experiment was conducted in the glasshouse using two wheat cultivars (Sun 92A and Vasco) differing in yield and protein content. The plants were subjected to water stress at 10 days after anthesis (daa). The following treatments were established: not watered (se-vere stress), medium stress (-2 Mpa water potentional of the Flag leaf), mild stress (-1 Mpa water optional of the Flag leaf), divided root and control. Results indicated that the dry matter and N content of vegetative organs and its concentration were greater at 24 daa than at maturity under all conditions. Water stress during the post anthesis period was unfavorable to a high assimilation rate, so yield was determined to a great extent by the availability of water and the behavior of the cultivars related to shoot reserve remo-bilization during the grain filling period.

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  The aim of this research was to compare the benefits of wheat enrichment in the farm with flour fortification in the factories. Three experiments have been carried out in the early of third Millennium in 6 different provinces, i.e. East and West Azerbaijan, Kerman, Sistan and Balouchestan and Southern Khorasan. The first and second experiments  (2000-02 and 2002-04), were designed based on t-distribution and included two treatments: The control plots were given nutrients based on Farmer's conventional fertilization practice (NP) and the treated plots received nutrients based on soil tests (balanced fertilization) in  Meyaneh (3 wheat farms) and Naghadeh (1 wheat farm) in East and West Azerbaijan provinces. In the wheat fields, micronutrient-fertilizer solution with 0.5% was sprayed at three stages (stem elongation, heading, and a week after flowering). After harvesting, the grain yield, phytic acid, Zn and PA/Zn molar ratio were measured. Then, whole-wheat bread and regular bread prepared from these farms were fed for 4 and 6-month periods to different groups in Tajark, Khanghah and Kahriz villages in East and West Azerbaijan, respectively. Before and after feeding the village inhabitants, zinc (Zn) and iron (Fe) concentration were measured in their blood serum. In the third experiments, in the summer of 2003, a study on the effect of fortification and improvement of the quality of bread on the health of consumer subjects was carried out on the total personnel  of Moghadam Mersad Military Station. A number of the drafted military service personnel of Moghadam Mersad Military Station and some personnel from Ravar Aboozar Military Station were selected for blood tests. During a 4-month test period, bread consumed at the Station and the associated units was fortified and the correct procedure of baking was taught to the bakers. The amount of Zn and Fe in the blood serum of the subjects was determined with an atomic absorption spectrometer. Fortification of the wheat flour was carried out at the Baghin Martyrs Station, by adding, 80 mg Zn; 50 mg Fe; 10 mg vitamin B1; 2.5 mg Vitamin B2; and 5 mg vitamin B6 per kg of flour. In the first and second experiments, the results demonstrated that there was a significant difference at one percent level for grain yield (α=0.01). Also, the statistical analysis revealed a significant difference for phytic acid, Zn and molar ratio of phytic acid to Zn (PA/Zn) in all wheat farms. Consumption of whole wheat bread in comparison with white bread for 4 and 6-month periods noticeably increased Zn and Fe concentration in blood serum especially in 6-month period. While the average Zn and Fe concentration in the blood serum in the second experiment for the control was 80 and 100, they were  increased to 110 and 130  μg/deciliters after the intervention in Kahriz village. In the third experiment, in places where bread was not fortified, the average level of Zn in the blood serum of individuals was measured to be 72 μg/deciliters; whereas, the serum Zn of the test subjects consuming fortified bread for a three-month period averaged 89 μg/deciliters (P<0.01). For persons who fed on unfortified bread, 47% suffered from Zn deficiency but those who used the superior quality, fortified bread, only 10% suffered from this deficiency (P<0.01). While the number of people using stomach-problem-related-medicines at the Beghin Martyrs Station during a 4-month period before the experiment was figured to be 1615, it was reduced to 1375 cases after the test; or a 15% decrease during a 4-month period. In conclusion it can be mention that superiority of the enrichment in the farm over flour fortification in the factory has been proven. Enrichment is preferred to flour fortification and its most important benefits are at least 20% increase in wheat yield as well as grain quality and more than 10% increase in minerals concentration due to more uptake by human's digestion system.

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  Paying a heavy subsidy just on N and P-fertilizers has caused farmers to overuse these fertilizers in the country and hence, more than 90% of the fertilizer use constitutes N and P-fertilizers on the irrigated wheat farms. Due to continuous imbalanced fertilization, especially the overuse of P-fertilizers and the absence of Zn-fertilizers in the farmers’ conventional fertilization practice, there has been an increase in the concentration of phytic acid (C6H18O24P6) in the wheat grains. Increased level of phytic acid (PA), would lead to a high molar ratio of phytic acid to zinc (PA/Zn) in wheat grains up to around 60. Phytic acid combines with metal cations in the digestive system  and converts them to phytate complexes which do not get absorbed in the human body. Presence of higher PA has been mentioned as a reason for discarding the wheat bran. Removing bran from the wheat grains is the fastest and easiest way of discarding PA.  According to the World Health Organization (WHO), for absorption of nutrients by digestive system in human body, PA/Zn index must be less than 25. Due to calcareous nature of the studied soils and continuous imbalanced fertilization, especially the overuse of P-fertilizers, PA/Zn molar ratio is around 60.  Since the main part (70%) of mineral nutrients, vitamins and PA are accumulated in the wheat bran, the authorities; instead of scientifically solving the problem- i.e. reducing PA and increasing Zn concentration in wheat grains- have decided to take away bran from the wheat kernel in the process of flour preparation. By removing subsidies in the 5^th Development Plan, since the price of bread will increase significantly, so it is necessary to increase the quality of the bread. To achieve high quality bread, concentrations of PA and Zn should decrease and increase, respectively. This is possible only through the enrichment of wheat in the farm by the use of balanced fertilization, eliminating subsidy on P-fertilizers and allocating subsidy to zinc, bio- and organic fertilizers in order to reduce PA/Zn index. Various studies in the past two decades have shown that if current imbalanced fertilization is continued, PA/Zn index will be well around 60, necessitating the removal of the bran. But, if balanced fertilization is adopted as a general practice by the country's farmers, this ratio will decrease and it will not be necessary to remove the bran in flour processing. It is suggested to remove the subsidy from N and P-fertilizers and allocate them to Zn, biological and organic fertilizers, as well as conducting soil and plant analysis to determine required fertilizer levels. Phosphate fertilizers must be given to the farmers only on the basis of soil tests.  Imposing heavy penalties on the bakers who illegally use baking soda instead of yeast and implementing optimal fertilizer management practices will result in crop enrichment in wheat farms, which, in addition to achieving sustainable production of healthy crops, will contribute to upgrading Iranian society’s health-rating. By practicing balanced fertilization, applying zinc sulfate and bio-organic fertilizers, the country's nutrition will improve and the quality and quantity of whole wheat bread will be upgraded significantly, and hence the problem of malnutrition will be solved in the Iranian society.

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Individual grain weight of wheat kernels differs with their positions on a spike. Cultivation practices (such as fertilizer nitrogen and plant growth regulators application) can be used to improve weight of basal and distal kernels. For this purpose, two experiments based on randomized complete block design were carried out with three replications. The aim of this research was to study the mechanisms related to sink strength as well as the regulatory factors affecting sink activity. One cultivar of a facultative wheat, cv Yangmai15, was used. Treatments of the experiments included application of nitrogen (two levels) and plant growth regulators [abscisic acid (ABA) and Fluridone (inhibitor ofABA synthesis)] in basal and distal kernels, respectively. Results showed that nitrogen application increased grain yield and its components. Grain filling in basal kernels started earlier and its rate was higher than that of the distal kernels. Nitrogen fertilizer increased the individual kernel weight both in basal and distal kernels, and the rate of increment was higher than the control, even in distal kernels. The application ofABA resulted in increase in grain weight, whereas a considerable decrease in grain weight was observed in response to Fluridone compared to the control. Nitrogen application together withABA application enhanced the activity of SuSase, AGPase, SSS, and SBE in basal and distal kernels and the increment in the activity was higher in distal kernels. It is concluded that simultaneous application of nitrogen andABA enhanced grain weight by regulating the activity of key enzymes involved in starch synthesis. 

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The objective of this study was to evaluate the adaptability and stability of wheat genotypes simultaneously in unbalanced Multi-Environment Trials (MET) in four different regions of Brazil, using the method of harmonic means of the relative performance of genetic values. Mixed model was applied to the analysis of Genotype- Environment Interaction (GEI) in wheat. Grain yield data were obtained from a network of MET carried out at seven locations from 2008 to 2010. A joint of experiments in complete randomized blocks design with some common treatments was used in all 21 experiments. Adaptability and stability parameters were obtained by several different methodologies, based on prediction, Harmonic Mean, and of the Relative Performance of Genotypic Values (HMRPGV). These methodologies ranked in a very similar way the studied genotypes and indicated the genotypes CD0950, CD0857, CD0667, CD0915, CD0914, CD0669, CD0859, and CD0851 as the superior ones for grain yield, adaptability, and stability in all environments. Dourados-MS (2010) was the worst environment with lowest mean (1,560.26 kg ha^-1) and São Gotardo–MG (2008) was the best environment with highest mean (5,687.08 kg ha^-1). The genotype more stable by HMRPGV across 21 environments tested was CD085; in the best environment, it was ranked the sixth (6,319.30 kg ha^-1), but changed your values in the worst environment and was ranked the fifth (2,051.53 kg ha^-1). The HMRPGV proved to be a practical and useful statistical tool in the determination of the Value for Cultivation and Use (VCU), particularly in the selection of genotypes’ reliability when genotypes are selected for the environments evaluated. This method has the advantage of providing results that are directly interpreted as breeding values ​​for yield, stability, and adaptability.
 

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The influence of seed priming on the growth, amino and fatty acids contents of two wheat (Triticum aestivum L.) cvs. Keumkang and Backjung were evaluated through pot experiments in greenhouse and at field conditions. Four priming treatments involving three soaking media: 2.5% potassium Chloride (KCl), 1% potassium Sulfate (K₂SO₄), distilled water (H₂O) and unprimed (dry seeds) as the control were laid out in a randomized complete block design with four replications for each experimental condition. Under greenhouse condition, 1% K₂SO₄ priming enhanced growth and yield of wheat, while 2.5% KCl reduced the dry matter yield in Keumkang, but not in Backjung. In field condition, 1% K₂SO₄ improved the growth of both cultivars and increased the yield of Backjung, while 2.5% KCl in Keumkang had the lowest yield. Overall, this study showed that seed priming with 2.5% KCl and 1% K₂SO₄ triggered specific changes in the Amino Acids (AA) and Fatty Acids (FA) compositions in grain and had carry-over effects on the plant’s metabolic adjustments, which were specific to the cultivar and the growing environmental conditions. The compositional changes in AA and FA induced by seed priming have a profound impact on grain and flour quality of wheat.
 

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Wheat floret primordia develop in a rather narrow window of time, mostly coinciding with stem elongation. That is why the stem elongation phase is considerd a critical period for grain number and yield determination. Under controlled conditions, floral primordia development of 10 mostly adopted bread wheat cultivars including Bayat, Azadi, Falat, Navid, Chamran, Marvdasht, Pishtaz, Shiraz, Sirvan, and Baharan, which were released during the last five decades, was studied in detail at Shiraz University, Shiraz, Iran. Floral primordia monitoring showed that visible floral degradation among wheat cultivars occurred at several floral developmental stages from green anther (GA) to anthesis (AN). Floral degradation period started from yellow anther stage and was longer in cultivars with lower grain number per spike (Bayat, Navid, Shiraz and Azadi cultivars). Also, cultivars that started stem elongation earlier, such as Sirvan, Baharan, Chamran, and Falat, had extended period for stem elongation and produced higher grain number per spike. Overall, it appeared that under short growing seasons of semi-arid regions, in which delay in flowering usually results in more floral mortality during GA to AN, cultivars with earlier stem elongation could be more efficient in production of grains.