Physiological studies on the relationship between wheat grain tyrosine and plant drought resistance
2009
Khalaf, A.S.
Two bread wheat cultivars (Triticum aestivum L. cvs. Abu-Ghraib 3 and Mexipak) and two of durum wheat (Triticum durum Desf. Acsad-65 and Om-Rabi-5) were subjected to various levels of water stress (-0.6, -0.8, -1 Mpa in addition to -0.03 Mpa, field capacity). Phenol reaction test was substituted with tyrosine test. Results revealed that the two bread wheat cvs. were more drought resistant than durum wheat cultivars as they were less affected by water stress and particularly Abu-Ghraib 3 which was superior over all involved cultivars. However, the reduction in total biomass and grain yield per pot was much less pronounced in Abu-Ghraib 3 than all other cultivars particularly the durum. Total biomass and grain yield were reduced as much as 83.84% and 91.06%, respectively, under the stress (-1 Mpa) in comparison to that grown under field capacity, while reductions of 85.61 % and 94.49 % were recorded for the wheat durum cultivar Om-Rabi 5. Besides, Abu-Ghraib,3 was the only cultivar which manifested the dark black coloration with tyrosine test. These results confirm that phenol can be successfully substituted with tyrosine for wheat varietal identification as the former one is caustic, hateful and has a harmful smell. Further studies are required to compare numerous wheat cultivars, those tolerant or sensitive to drought to confirm these results.
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