Drought Resistance and Mitotic Instability of Tritipyrum Compared with Triticale and Bread Wheat

  • Zolfaghar SHAHRIARI Shiraz University, Department of Agronomy and Plant Breeding, College of Agriculture, Shiraz
  • Mohammad Taghi ASSAD Shiraz University, Department of Agronomy and Plant Breeding, College of Agriculture, Shiraz
  • Hosein Shahsavand HASANI Shiraz University, Department of Agronomy and Plant Breeding, College of Agriculture, Shiraz

Abstract

This study presents the first data on the drought resistance pattern of seven new synthetic 6x primary Tritipyrum amphiploid linesand evaluates their mitotic instability. The primary Tritipyrum lines were crossed with Iranian 6x bread wheat ‘Navid’ cultivar and theirF1 and F2 progenies were obtained. Two experiments with complete randomized design were conducted under optimum and limitedwater conditions to evaluate Tritipyrum-derived genotypes for drought resistance in greenhouse. Under optimum water conditions,grain yield, numbers of grains per spike and harvest index of Tritipyrum-derived genotypes were significantly lower than bread wheat;however the differences were not significant under limited water conditions. These results showed the better responses of Tritipyrumderivedgenotypes to drought conditions. Evaluation of leaf osmotic and water potentials and drought susceptibility index showedthat drought resistance of Tritipyrum and F1 genotypes was significantly higher than that of bread wheat and Triticale. Cytologicalinvestigations showed that Tritipyrum-derived genotypes aneuploidy was significantly higher than Triticale and bread wheat (p<0.05).Mitotic instability in light grains (1000-grains weight < 30 gr) was significantly higher than heavy grains (1000-grains weight > 30 gr) inparental and F2 genotypes (p<0.01). Aneuploidy has showed a significant negative correlation with fertility, grain yield and 1000-grainsweight in Tritipyrum genotypes. In general, Tritipyrum may complement the role of bread wheat in arid and semi-arid regions; butfurther breeding research is needed to overcome its mitotic instability.

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Author Biographies

Zolfaghar SHAHRIARI, Shiraz University, Department of Agronomy and Plant Breeding, College of Agriculture, Shiraz
Department of Agronomy and Plant Breeding, College of Agriculture, Shiraz University, Shiraz, IRAN.
Mohammad Taghi ASSAD, Shiraz University, Department of Agronomy and Plant Breeding, College of Agriculture, Shiraz
Department of Agronomy and Plant Breeding, College of Agriculture, Shiraz University, Shiraz, IRAN.Prof.
Hosein Shahsavand HASANI, Shiraz University, Department of Agronomy and Plant Breeding, College of Agriculture, Shiraz
Department of Agronomy and Plant Breeding, College of Agriculture, Shahid Bahonar University of Kerman, Kerman, IRAN, Assis. prof.
Published
2012-05-14
How to Cite
SHAHRIARI, Z., ASSAD, M. T., & HASANI, H. S. (2012). Drought Resistance and Mitotic Instability of Tritipyrum Compared with Triticale and Bread Wheat. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 40(1), 170-176. https://doi.org/10.15835/nbha4017564
Section
Research Articles