EMERGENCE AND SEEDLING GROWTH OF INBRED LINES OF CORN AT SUBOPTIMAL ROOT-ZONE TEMPERATURES
- 1 April 1987
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Plant Science
- Vol. 67 (2) , 409-415
- https://doi.org/10.4141/cjps87-059
Abstract
Based on the results of an earlier paper, 12 inbred lines of corn (Zea mays L.) were evaluated for emergence and seedling growth at three controlled root-zone temperatures (10, 14, and 18 °C). Low root-zone temperatures, 10 and 14 °C, were detrimental to emergence, seedling growth, and root growth of all inbred lines. Differential responses of inbred lines were observed within each temperature regime. The differences in seedling emergence among lines became smaller with increasing root-zone temperature, while the reverse was true for seedling dry weight. Simple correlation coefficients showed a significantly (P = 0.05) negative association between emergence percentage and emergence index (rate). Neither of these two emergence traits was significantly correlated with seedling dry weights. Seedling dry weights were significantly (P = 0.01) and positively associated with root dry weights. Two inbred lines exhibited good tolerance to low root-zone temperatures, viz. CO255 and RB214. A significant and positive correlation existed between emergence percentage at a root-zone temperature of 10 °C and field emergence in test with the same genotypes reported earlier. Selection at a root-zone temperature of 10 °C for a high percentage of seedling emergence, therefore, could be effective in identifying genotypes capable of germinating in cool soils. Furthermore, the significantly (P = 0.01) positive relationship between seedling dry weights at all root-zone temperatures and those from the field test suggest that strains with vigorous seedling growth in the field could be identified using low root-zone temperature regimes.Key words: Zea mays, root-zone temperature, cold toleranceThis publication has 7 references indexed in Scilit:
- GROWTH RESPONSES OF EARLY MATURING INBRED LINES OF CORN TO SUBOPTIMAL TEMPERATURESCanadian Journal of Plant Science, 1985
- Populations of maize with more rapid and reliable seedling emergence than cornbelt dents at low temperaturesEuphytica, 1981
- Selection for Cold Germination in Two Corn Populations1Crop Science, 1979
- ADAPTATION OF CORN FOR WHOLE-PLANT SILAGE IN CANADACanadian Journal of Plant Science, 1978
- CULTURAL PRACTICES AFFECTING MATURITY AND YIELD OF CORN (ZEA MAYS) FOR WHOLE-PLANT SILAGE IN SHORT-SEASON AREASCanadian Journal of Plant Science, 1978
- Evaluation of maize plant introductions for cold toleranceEuphytica, 1978
- Soil temperature and its association with maize yield variations in the Highlands of KenyaThe Journal of Agricultural Science, 1977