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Dissection of environmental and physiological effects on the temperature difference between superior and inferior spikelets within a rice panicle

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The Crop Journal 2021年第5期9卷 1098-1107页

作者： Yi Li Qianlan Zhou Mingjie He Hongfa Xu Ganghua Li Yanfeng Ding Matthew Paul Zhenghui Liu College of Agriculture Nanjing Agricultural UniversityNanjing 210095JiangsuChina Collaborative Innovation Center for Modern Crop Production Nanjing Agricultural UniversityNanjing 210095JiangsuChina Plant Sciences Rothamsted ResearchHarpendenHertfordshire AL52JQUK

Temperature of a plant organ constitutes an integrative index to its eco-physiological properties and ***,little attempt has been made to dissect the combined effect of ecological and physiological factors on the surface temperature of a plant organ such as the rice *** this study,using a deactivated plant as reference,we developed a novel comparison method to dissect the environmental and physiological effects on temperature of rice *** japonica rice cultivars with contrasting canopy features were used as testing *** of flag leaf,superior and inferior spikelets and their diurnal rhythm during grain filling stage were precisely measured by a hand-held infrared *** results showed that the variation of environmental conditions within a panicle was relatively minor,posing a limited influence on temperature difference between the superior and inferior *** the other hand,it was the intrinsic physiological properties that considerably affected the spatial variations of spikelet temperature within a *** analysis of sucrose and starch in grains and bracts indicated that the superior spikelet is more physiologically active at photosynthetic assimilation and starch ***,sugar in bracts exhibited a pattern of diurnal changes similar to the source leaf but different from the sink grain,confirming that bracts are source organs for grain *** findings yield penetrating insight into the eco-physiological foundation of spikelet temperature,thus being helpful for the application of physiological approaches in crop breeding for cooler canopy.

关键词： Organ temperature Rice Superior spikelet Inferior spikelet eco-physiological mechanism

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