Abstract
Poor emergence of maize seedlings, due to high soil temperatures, is a major limitation of crop potential in the lowland tropics. Ability to germinate at high temperature (>c. 37° C) is related to the temperature sensitivity of the embryo, and there is considerable genotypic variation for this character.
Respiration and mitochondrial phosphorylation proceed normally in seeds imbibing at 41° C, and ATP levels are adequate for germination. However, the specific activities of several important enzymes are lower, and the rate of protein synthesis is severely reduced compared with seeds imbibing at 28° C. The depression of the rate of protein synthesis in the embryos of several tropical hybrids imbibing at high temperature correlated with their known temperature sensitivity. It is concluded that protein synthesis is an especially temperature sensitive process in germinating maize embryos, and that this is the principal reason for the sensitivity of germinating maize seeds to high temperature.
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Abbreviations
- ADP:
-
adenosine-5′-diphosphate
- ATP:
-
adenosine-5′-triphosphate
- BSA:
-
bovine serum albumin
- EDTA:
-
ethylenediaminetetra-acetic acid
- HEPES:
-
N-2-hydroxyethylpiperazinc-N′-2-ethanesulphonic acid
- NADH:
-
nicotinamide-adenine dinucleotide, reduced form
- PPO:
-
2, 5-diphenyloxazole
- PVP:
-
polyvinylpyrrolidone
- SEM:
-
standard error of the mean
- tris:
-
tris (hydroxymethyl)-methylamine
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Riley, G.J.P. Effects of high temperature on the germination of maize (Zea mays L.). Planta 151, 68–74 (1981). https://doi.org/10.1007/BF00384239
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DOI: https://doi.org/10.1007/BF00384239