Search Results - (Author, Cooperation:G. L. Hammer)

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  1. 1
    D. B. Lobell ; M. J. Roberts ; W. Schlenker ; N. Braun ; B. B. Little ; R. M. Rejesus ; G. L. Hammer
    American Association for the Advancement of Science (AAAS)
    Published 2014
    Staff View
    Publication Date:
    2014-05-03
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    *Acclimatization ; *Adaptation, Physiological ; Climate Change ; Crops, Agricultural/*growth & development ; *Droughts ; Soybeans/growth & development ; *Stress, Physiological ; United States ; Zea mays/*growth & development
    Published by:
    http://www.aaas.org/

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  2. 2
    Staff View
    ISSN:
    1432-2242
    Keywords:
    Key words Sorghum bicolor ; Flowering ; Temperature ; Photoperiod ; Adaptation
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Biology
    Notes:
    Abstract  Sorghum [Sorghum bicolor (L.) Moench] is an important cereal crop grown in a wide range of tropical and temperate environments. This study was conducted to characterise the photothermal flowering responses of sorghum genotypes and to examine relationships between photothermal characteristics and environment of origin in order to better understand the phenological basis of adaptation to environment in sorghum. Twenty-four germplasm accessions and one hybrid from 24 major sorghum-growing areas were grown in a wide range of environments varying in temperature and photoperiod in India, Kenya and Mali between 1992 and 1995. Times from sowing to flowering (f) were recorded, and the responsiveness of 1/f to temperature and photoperiod was quantified using photothermal models. Times from sowing to flowering were accurately predicted in a wide range of environments using a multiplicative rate photothermal model. Significant variation in the minimum time to flower (Fm) and photoperiod sensitivity (critical photoperiod, Pc, and photoperiod-sensitivity slope, Ps) was observed among the genotypes; in contrast there was little variation in base temperature (Tb). Adaptation of sorghum to the diverse environments in which it is grown was largely determined by photoperiod sensitivity and minimum time to flower; photoperiod sensitivity determines broad adaptation to latitude (daylength), while variation in the minimum time to flower determines specific adaptation within smaller ranges of latitude, e.g. within the humid and sub-humid tropics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/s001220051311

    Articles: DFG German National Licenses