Earliness per se and its dependence upon temperature in diploid wheat lines differing in the major gene Eps-Am1 alleles
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Differences in development among wheat cultivars are not only restricted to photoperiod and vernalization responses. When both requirements are fully satisfied differences may still arise due to earliness per se. It is not clear at present to what extent this trait is ‘ intrinsically ’ expressed (a constitutive trait) independently of the environmental conditions so that it might be selected under any thermal condition or if it may be altered to the extent of showing a crossover interaction with temperature in which the ranking of wheat genotypes may be altered. The present study assessed the influence of temperature on the intrinsic earliness for lines of diploid wheat characterized for their differences in a major gene for intrinsic earliness, but also possibly differing in their genetic background for other factors controlling this polygenic trait. To do so the lines were grown individually in two temperature regimes (16 and 23 xC) under long days having previously been fully vernalized. Multiple comparisons analyses were carried out among lines of the same allelic group for the Eps-Am1 gene. Results indicated that within each group there were lines that did not differ in their earliness per se, others differed but without exhibiting any linertemperature interaction and finally different types of interaction were shown, including cases where the ranking of lines was altered depending on the growing temperature. It is thus possible that the selection of a genotype based on its earliness per se in an environment might not represent the same performance in another location where temperature varied significantly.
Is part ofJournal of Agricultural Science, 2003, vol. 141, núm. 2, p. 149-154
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Ochagavía Orbegozo, Helga; Prieto, Paula; Zikhali, Meluleki; Griffiths, Simon; Slafer, Gustavo A. (Nature Publishing Group, 2019-02-22)Differences in time to heading that remain after photoperiod and vernalisation requirements have been saturated are classified as earliness per se (Eps) effects. It has been commonly assumed that Eps genes are purely ...
Earliness per se x temperature interaction consequences on leaf, spikelet and floret development in wheat Prieto, Paula; Ochagavía Orbegozo, Helga; Griffiths, Simon; Slafer, Gustavo A. (Oxford University Press, 2019-12-26)Wheat adaptation can be fine-tuned by Eps genes. Although the effects of Eps genes are often assumed to act independently of the environment, previous studies have shown they exhibit temperature-sensitivity. Number of ...
Effects of ambient temperature in association with photoperiod on phenology and on the expressions of major plant developmental genes in wheat (Triticum aestivum L.) Kiss, Tibor; Dixon, Laura E.; Soltész, Alexandra; Bányai, Judit; Mayer, Marianna; Balla, Krisztina; Allard, Vincent; Galiba, Gábor; Slafer, Gustavo A.; Griffiths, Simon; Veisz, Ottó; Karsai, Ildikó (Wiley, 2017-04-20)In addition to its role in vernalization, temperature is an important environmental stimulus in determining plant growth and development. We used factorial combinations of two photoperiods (16H, 12H) and three temperature ...