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This article in CS

  1. Vol. 28 No. 2, p. 283-286
     
    Received: May 28, 1987


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doi:10.2135/cropsci1988.0011183X002800020021x

Influence of Temperature on Heterosis for Maize Seedling Growth

  1. S. B. Rood ,
  2. R. I. Buzzell and
  3. M. D. MacDonald
  1. D ep. of Biological Sciences, Univ. of Lethbridge, Lethbridge, Alberta TIK 3M4;
    A gric. Canada Res. Stn., Harrow, Ontario, N0R 1G0;
    A gric. Canada Res. Stn., Lethbridge, Alberta, T1J 4B1.

Abstract

Abstract

Heterosis in crop plants may result partly from a superior ability of hybrids to tolerate environmental stress. The present study was conducted to investigate the influence of cool temperature on heterosis in maize (Zea mays L.). A four-parent diallel including reciprocals, from maize inbreds A632, B73, CH607-88, and CO109 was grown in controlled environment conditions under three temperature regimes: 20/10, 25/15, and 30/20°C (day/night). Leaf areas, heights and shoot dry weights were measured for growth analysis calculations. Potence ratios, representing the overall degrees of dominance, provided quantitative estimates of heterosis for the 12 hybrids. At all three harvests for all three temperatures, all hybrids had greater shoot dry weights and leaf areas and were taller than their parental inbreds. Consequently, potence ratios exceeded one for all parameters; considerable heterosis was observed in all hybrids at all temperatures. There were no general patterns of changes in potence ratios across the three temperatures. For example, mean potence ratios for leaf areas of the 12 hybrids over the three harvests were 16.7, 14.8, and 18.4, respectively, for the three temperature regimes. Thus, the level of heterosis in these hybrids was generally similar under favorable or unfavorable temperature conditions. This indicates that heterosis is not simply an ability of hybrids to better tolerate cool temperature stress. Rather, the hybrids from this group of elite inbreds displayed heterosis similarly under favorable or cool temperature conditions.

Work supported by Canadian Natural Sciences and Engineering Research Council Grant U0-285 and a Univ. of Lethbridge research grant to the senior author.

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