Flowering of diverse maize cultivars in relation to temperature and photoperiod in multilocation field trials

Bonhomme, R. and Derieux, M. and Edmeades, G.O. (1994) Flowering of diverse maize cultivars in relation to temperature and photoperiod in multilocation field trials. Crop Science, 34 (1). pp. 156-164.

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This study was conducted in order to evaluate methods of calculating thermal time for the sowing-silking interval (SSI) in a diverse group of 18 maize cultivars which were sown in a multilocation field trial at 53 sowing date-location combinations. Mean temperature ranged from 13.2 to 29.4°C during the SSI and photoperiod at tassel initiation ranged from 11.7 to 19.5 h. Thermal time computed from daily maximum (TX) and minimum temperatures with a base of 6°C, an optimum temperature (T0) of 30°C, and a linear adjustment for supra-optimal values of TX such that TX = 30 - (TX - T0), resulted in a lower coefficient of variation (CV) for thermal time across sites and cultivars (10.9%) than did other methods, though several of these methods gave similar results. The CVs for thermal duration of the SSI for cultivars adapted to temperate, lowland tropical and highland tropical environments averaged 7.8, 11.5 and 15.4%, respectively. For tropically-adapted cultivars, the increase in the sowing-anthesis interval in daylengths >13 h averaged 47°Cd h-1 (range 24-100 °Cd h-1), while temperate cultivars were virtually photoperiod insensitive. Photoperiod sensitivity was positively correlated with the anthesis-silking interval (r = 0.62) This study confirmed the need to determine photoperiod sensitivity and optimum temperatures for development of tropical cultivars if precise estimates of thermal time to flowering and maturity at sites with photoperiods >13 h are required.

Item Type: Article
Author Affiliation: Station de Bioclimatologie, INRA, 78850 Thiverval-Grignon, France
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Maize
Depositing User: Sandhya Gir
Date Deposited: 14 Oct 2010 09:49
Last Modified: 11 Jan 2011 16:57
Official URL: https://www.crops.org/publications/cs/abstracts/34...
URI: http://eprints.icrisat.ac.in/id/eprint/22

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