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Articles by Reza Tavakkol-Afshari
Total Records ( 2 ) for Reza Tavakkol-Afshari
  Reza Tavakkol-Afshari
  Pre-harvest sprouting seriously reduces durum grain quality and is considered as an important grading criterion in all market classes of wheat (Triticum sp.). In northern Iran, untimely rain and humid conditions at harvest time cause sprouting of kernels in spike. There are few researches in the literature on pre-harvest sprouting and related traits in durum wheat (Triticum turgidum L. var. durum). A two years study (2001 and 2002) was conducted to evaluate the genetic variation of sprouting resistance and related trait in the Iranian germplasm of durum wheat accessions. In 2001, a total of 532 accessions were planted under field conditions. Unreplicated samples of 10 spikes from each genotype were evaluated for spike sprouting and falling number under laboratory conditions. Using two screening methods, the 2001 study indicated that durum accessions had a similar range in sprouting score and sprouting index to the wheat check cultivars. The sprouting score for durum accessions ranged from zero to 10. Twenty-eight of selected accessions with high level of sprouting resistance were re-evaluated in a replicated study in the second year. Sprouting score and sprouting index measured in 2002 were correlated with those of 2001. According to the results of this study, there is considerable genetic variation in sprouting resistance in durum germplasm that can be exploited by breeding programs.
  Afrasyab Rahnama-Ghahfarokhi and Reza Tavakkol-Afshari
  The aim of this study was to examine whether Ferula gummosa seeds possess physical, physiological or combined dormancy. Seeds collected from Shahrekord zone in the center of Iran were subjected to different treatments. Dormancy breaking treatments were included: prechilling for 20, 30 and 40 days, exogenous application of GA3 (250, 500 and 1000 ppm), prechilling for 40 days combined with various levels of GA3 (250, 500, 1000 ppm), H2SO4 (80%) for 5 and 10 min, hot water at different temperatures (70 and 90°C) for 10 min, thiourea (3%) and KNO3 (0.3%) for 72 h. Germination of Ferula gummosa significantly increased at higher concentrations of GA3 (1000 ppm) and a longer period of prechilling treatments (for 40 days) and reached 41 and 69%, respectively. Consequently, these treatments were highly effective in dormancy breaking in comparison with other prechilling and GA3 treatments. The highest germination was observed when seeds were exposed to prechilling (for 40 days) combined with GA3 (1000 ppm) and induced up to 75% germination and suggested a synergistic response to GA3 and prechilling. Radicle and plumule length, vigor index and Mean Germination Time (MGT) were also affected through treatments. Thiourea (3%), KNO3 (0.3%) and 90°C hot water for 10 min had no effect on germination and other traits. Germination rate was positively correlated with germination percentage. These results showed that Ferula gummosa seeds exhibit both exogenous and endogenous dormancy.
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