Behavior of 3 cold tolerant and 1 standard soybean varieties in relation to the level and the duration of a cold stress

Schmid, J.; Keller, E.R.

Canadian Journal of Plant Science 60(3): 821-830

1980


ISSN/ISBN: 0008-4220
Accession: 004814633

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Abstract
The cold tolerance of the varieties Gieso (West Germany), Amurskaja 41 (Russia), ISZ-7 and I-1 (Hungary) was investigated in growth chamber and greenhouse experiments. In the growth chamber trial, cool and cold temperatures reduced the grain yield of 'Gieso' whereas 'ISZ-7' and 'I-1' increased their yields from the high temperature level to the coldest one. 'Amurskaja 41' had about the same yield in the warm and cool temperature regimes but in the coldest treatment, yields were lower than those of 'Gieso'. The high quality of 'ISZ-7' and 'I-1' to compensate for stress periods as compared with 'Gieso' and also with 'Amurskaja 41' was reflected in the average growth rate, flower and pod formation and dry matter production per plant. In the greenhouse experiment, duration of a cold stress at vegetative stages V1 and V3 and at the beginning of flowering was investigated. All tested varieties were able to compensate for cold stress of 10 days whereas only ISZ-7 and I-1 showed good yields under a long period of stress. These more cold tolerant varieties were particularly able to make good use of subsequent higher temperatures as expressed by the grain weight per degree Celsius. The stability of harvest index is also an important factor in cold tolerance investigations.