Abstract
AbstractThe physiological response of multiple rice cultivars, eighteen initially and eight cultivars later on, to suboptimal temperatures (ST) conditions was investigated in laboratory and outdoor experimental conditions. Treatment withSTdecreased growth in different extents according to the cultivar and affected thePSIIperformance, determined by chlorophyll fluorescence fast‐transient test, and stomatal conductance, regardless the experimental condition. Two groups of cultivars could be distinguished on the base of their growth and physiological parameters. The group of cultivars presenting higher growths displayed optimalJIPvalues, and higher instantaneous water use efficiency (WUEi), due to a lower Gs underST, unlike cultivars showing lower growth values, which presented worseJIPvalues and could not adjust their Gs and hence theirWUEi. In this work, we detected at least two cultivars with superior tolerance toSTthan the cold tolerant referent Koshihikari. These cultivars could be used as parents or tolerance donors in breeding for new crop varieties. On other hand, positive and significant correlations between data obtained from laboratory and outdoor experiments suggest that laboratory measurements of most of the above mentioned parameters would be useful to predict the response of rice cultivars toSToutdoor.
Published Version
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