Evaluation of chilling sensitivity in different rice varieties. Relationship between screening procedures applied during germination and vegetative growth |
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Authors: | P Bertin J M Kinet J Bouharmont |
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Institution: | (1) Laboratoire de Cytogénétique, Université Catholique de Louvain, Place Croix du Sud, 5 b13, B-1348 Louvain-la-Neuve, Belgium |
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Abstract: | Summary Rice varieties were screened for chilling tolerance during germination and vegetative growth using different techniques. The effects of temperature during germination were investigated from 10 to 25°C. The screening was most effective at 10°C. Time of data collection has to be considered in order to discriminate slow germinating from chilling sensitive varieties. Chilling survival tests (10°C) applied at the 2-leaf stage revealed that different chilling durations brought complementary results: the longer treatments allowed to identify the most tolerant varieties, while shorter treatments allowed to distinguish intermediate from most sensitive rices. Results of chilling tests applied at the 2- and the 8-leaf stages showed a high correlation. Low-temperature electrolyte leakage and low-temperature fluorescence were also highly correlated to each other and to survival tests applied at the same development stage. By contrast, weak correlations were observed between low-temperature germination and plantlet chilling survival. It is concluded that low-temperature electrolyte leakage and low-temperature fluorescence are good indicators of chilling tolerance during the vegetative growth. The possibility to use a chilling screening procedure applied at this stage in order to predict the chilling tolerance at other development stages is discussed. |
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Keywords: | Oryza sativa rice chilling electrolyte leakage chlorophyll fluorescence seed dormancy seed germination |
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