Classification of Global Environments and Cultivars of Spring Barley Based on Heading Time Interactions

Autor: K. M. Soliman, L. W. Gallagher
Rok vydání: 1988
Předmět:
Zdroj: Plant Breeding. 100:124-136
ISSN: 1439-0523
0179-9541
DOI: 10.1111/j.1439-0523.1988.tb00227.x
Popis: Global heading time data collected by the International Center for Maize and Wheat Improvement (CIMMYT) during the International Barley Yield Trials were used to assess similarity of environments, variation among cultivars, and genotype × environment interactions. Data for 29 spring barley cultivars grown in 89 environments over three years were analyzed by cluster analysis. The deviation m days to heading of the mean of 28 photoperiod sensitive cultivars from the cultivar ‘Mona’ and the mean of ‘Mona’, homozygous recessive for the eak gene conferring photoperiod insensitivity and thermal stability, were used as environmental coordinates. In addition, diversity of heading time responses among genotypes was illustrated by differences among overall means and patterns of deviation for days to heading from ‘Mona’ in selected environments. Three main clusters were identified. Mexican environments were similar to warmer Mediterranean, eastern and southern African, West Asian, and Latin American environments. Heading time responses in Syria were similar to those observed m other cool Mediterranean environments. Early heading cultivars exhibited greater variation for heading response, especially in extremely warm-and equaiorial- short daylength environments, com-pared to late heading cultivars, presumably because of larger photothermal × genotype interactions. Photoperiod flux about the winter solstice appeared to be a major environmental cue for heading time in photoperiod sensitive spring barleys.
Databáze: OpenAIRE
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