caa a22 4500 47713551X CHVBK 20180405111716.0 cr unu---uuuuu 170330e19970601xx s 000 0 eng 10.1023/A:1003045616631 doi (NATIONALLICENCE)springer-10.1023/A:1003045616631 Genetic variation and interrelationships of agronomic characters in landraces of bread wheat from southeastern Iran [Elektronische Daten] [M. Moghaddam, B. Ehdaie, J.G. Waines] There is renewed interest in wheat landraces as important sources of genetic variation for agronomic characters. Fifty-three pure lines of bread wheat (Triticum aestivum L.) derived from seven landraces collected from southeastern Iran were used to estimate genetic variation and heritability for 13 developmental and quantitative characters. Path-analysis was used to partition the genetic correlations between grain yield and six grain yield-related traits. Mean values of landraces were also compared with three improved cultivars from California and Iran. Genotypic differences among the landraces and among the pure lines collected from the landraces were highly significant for all characters considered. Compared with the modern cultivars, the landrace genotypes were, on average, later in days to heading and taller than the cultivars but had lower values for number of grains per spike, 1000-grain weight, grain yield and harvest index. Some landrace genotypes were similar to the modern cultivars for grain yield. Moderate to high genetic variation was displayed by number of grains per spike, number of spikes per plant, 1000-grain weight, and harvest index. The heritability estimates ranged from 59% for grain yield to 99% for days to anthesis. Expected genetic advance (as % of the mean) was ≈34% for number of spikes per plant, number of grains per spike, and 1000-grain weight. Days to heading and to anthesis correlated positively with number of spikes per plant, shoot biomass, and straw biomass but negatively with number of grains per spike and harvest index. The strong direct effect of number of spikes per plant on grain yield was completely counterbalanced by its indirect negative effects via number of grains per spike and 1000-grain weight. Number of grains per spike and 1000-grain weight were positively correlated with grain yield, and they had large direct effects. These two characters, however, were negatively correlated and exhibited a substantial counterbalance effect via one another and via number of spikes per plant. The landraces could be improved by intercrossing the promising genotypes identified in this study, with simultaneous selection for earliness, fewer number of spikes per plant, greater number of grains per spike and heavier grains. For further improvement, crossing programs between the landraces and introduced germplasm may be necessary. Kluwer Academic Publishers, 1997 Triticum aestivum L nationallicence bread wheat nationallicence landraces nationallicence genetic variation nationallicence path-analysis nationallicence yield and yield components nationallicence selection nationallicence Iran nationallicence Moghaddam M. Department of Agronomy, Tabriz University, Tabriz, Iran aut Ehdaie B. Department of Botany and Plant Sciences, University of California, 92521-0124, Riverside, CA, U.S.A aut Waines J.G. Department of Botany and Plant Sciences, University of California, 92521-0124, Riverside, CA, U.S.A aut Euphytica Kluwer Academic Publishers 95/3(1997-06-01), 361-369 0014-2336 95:3<361 1997 95 10681 https://doi.org/10.1023/A:1003045616631 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1003045616631 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Moghaddam M. Department of Agronomy, Tabriz University, Tabriz, Iran aut NATIONALLICENCE 700 1- Ehdaie B. Department of Botany and Plant Sciences, University of California, 92521-0124, Riverside, CA, U.S.A aut NATIONALLICENCE 700 1- Waines J.G. Department of Botany and Plant Sciences, University of California, 92521-0124, Riverside, CA, U.S.A aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 95/3(1997-06-01), 361-369 0014-2336 95:3<361 1997 95 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer