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Crop simulation models use allometric relationships to predict plant height from vegetative characteristics. The objective of this study was to find relationships between plant height (PH) and number of leaves on main stem (NLMS), stem dry weight (SDW) (g plant−1) and total vegetative components (leaves and stems) dry weight (TVDW) (g plant−1) in wheat (Triticum aestivum L.). For this purpose, an experiment was conducted using seven wheat cultivars including two durum wheat cultivars (Arya and Taro) and five bread wheat cultivars (Darya, Kuhdasht, Shiroudi, Tajan and Zagros) under irrigated and rainfed conditions during 2008-2009 at Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. The experimental design was a randomized complete block design with four replications. Sampling was started from beginning of tillering and continued until maturity. A segmented nonlinear regression model was used to describe allometric relationships between PH and the vegetative characteristics. The results showed that there was no significant difference between cultivars and the two conditions for allometric relationships, so one equation was usable for all cultivars under both irrigated and rainfed conditions. Significant relationships were found between PH and NLMS (R2 = 0.94), SDW (R2 = 0.95) and TVDW (R2 = 0.95). These equations can be used for estimation of PH in simulation models of wheat.

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Purple colour of wheat grain is determined by anthocyanin accumulation in the pericarp. This trait is controlled in hexaploid Triticum aestivum or tetraploid T. durum wheats by two complementary dominant genes Pp1 (chromosome 7B) and Pp3 (chromosome 2A). It remained unclear, whether functional alleles of one of the two complementary Pp genes occur in the diploid progenitors of allopolyploid wheat or in tetraploid T. timopheevii. In the current study, a purple-grained wheat line PC was obtained by crossing non-purple-grained T. aestivum Line 821 and Line 102/00i carrying introgressions from T. timopheevii and Aegilops speltoides, respectively. Crosses of lines 821 and 102/00i with a number of tester lines and cultivars did not result in purple-grained genotypes suggesting that expression of this trait in PC was controlled by complementary factors, one located in the T. timopheevii introgression and the other in the introgression inherited from Ae. speltoides. Genotyping of PC and other parental lines using microsatellite markers located on wheat chromosomes 7B and 2A showed that PC carries chromosome 7S of Ae. speltoides substituting for chromosome 7B, whereas chromosome 2A of PC contains an extended introgression from T. timopheevii.

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Nachit, M.M., Nachit, G., Ketata, H., Gauch, H.G., Zobel, R.W. 1992. Use of AMMI and linear regression models to analyze genotype-environment interaction in durum wheat. Theor. Appl. Genet. 83 :597–601. Zobel

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, R. P., Mujeeb-Kazi, A. (1997): Resistance to stripe rust in durum wheats, A-genome diploids, and their amphiploids. Euphytica , 94 , 279–286. Mujeeb-Kazi A. Resistance to stripe

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. Araus , J.L. , Amaro , T. , Casadesús , J. , Asbati , A. , Nachit , M.M. 1998 . Relationships between ash content, carbon isotope discrimination and yield in durum wheat . Functional Plant Biol. 25 : 835 – 842

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Cereal Research Communications
Authors: Sonja Maric, Tihomir Cupic, Goran Jukic, Ivan Varnica, and Dario Dunkovic

Akcura M. — Kaya Y. — Taner S.: 2005. Genotype-environment interaction and phenotypic stability analysis for grain yield of durum wheat in the central Anatolian region. Turk J Agric For no. 29 369–375 pp

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Grains of 12 accessions of Triticum timopheevii (Zhuk.) Zhuk. ssp. timopheevii (AAGG, 2n = 4x = 28) and one bread wheat cultivar Chinese Spring (CS) and one durum wheat cultivar Langdon (LDN) grown across two years were analyzed for grain iron (Fe) and zinc (Zn) concentrations. All the 12 tested T. timopheevii ssp. timopheevii genotypes showed significantly higher concentration of grain Fe and Zn than CS and LDN. Aboundant genetic variability of both the Fe and Zn concentrations was observed among the T. timopheevii ssp. timopheevii accessions, averagely varied from 47.06 to 90.26 mg kg−1 and from 30.05 to 65.91 mg kg−1, respectively. Their grain Fe and Zn concentrations between years exhibited a significantly positive correlation with the correlation coefficients r = 0.895 and r = 0.891, respectively, indicating the highly genetic stability. Flag leaf possessed twice or three times higher concentrations for both Fe and Zn than grain, and a significantly high positive correlation appeared between the two organs with r = 0.648 for Fe and r = 0.957 for Zn concentrations, respectively, suggesting flag leaves might be indirectly used for evaluating grain Zn and Fe contents. Significant correlations occurred between grain Fe and Zn concentrations, and between grain Zn concentration and the two agronomic traits of plant height and number of spikelets per spike. Both the concentrations were not related to seed size or weight as well as NAM-G1 gene, implying the higher grain Fe and Zn concentrations of T. timopheevii ssp. timopheevii species are not ascribed to concentration effects of seed and the genetic control of NAM-G1 gene. There might be some other biological factors impacting the grain’s Zn and Fe concentrations. These results indicated T. timopheevii ssp. timopheevii species might be a promising genetic resource with high Fe and Zn concentrations for the biofortification of current wheat cultivars.

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Korkut, K. Z., Başer, I., Bilir, S. (1993): Studies on correlation and path analysis in durum wheats. pp. 183-187. Symposium of Durum Wheat and Its Products, Ankara. Studies on correlation and path analysis in durum wheats

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Autran J.C., Laignelet B., Morel M.H. 1987. Characterization and quantification of LMW glutenins in durum wheats. Biochimie 69 :699–711. Morel M

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growth condition effects on doubled haploid production in durum wheat crossed with maize. Plant Breeding 119 :289–298. DePauw R.M. Dicamba and growth condition effects on doubled

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