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The Effect of organ temperature on Total Yield of Transplanted and Direct-Seeded Rice(Oryza sativa L.)

Phyton-International Journal of Experimental Botany 2023年第11期92卷 2999-3019页

作者： Ziwei Li Lifen Huang Zhongyang Huo Min Jiang Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology Agricultural College of Yangzhou UniversityYangzhou225009China Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops Yangzhou UniversityYangzhou225009China

The canopy temperature of rice is an important index that directly reflects the growth and physiological state of rice,and affects the yield of rice plants to a great *** correlation between the temperatures of different rice organs and canopy in different growth stages and the grain yield is *** stability and universality of these correlations must be *** conducted a pot experiment using two rice varieties and two temperature treatments(high temperature treatment was carried out at the beginning of heading stage for 10 days).We measured rice organ temperature during seven stages of growth using a high-precision infrared thermal *** showed that the optimal observation period for the rice canopy temperature was 13:*** the rice variety did not significantly impact the canopy or organ temperature(p>0.05),the different organs and canopy exhibited significantly different temperatures(ptemperature differences and seed setting rate,theoretical and actual yields were the strongest during the milk *** them,the correlation coefficient betweenΔT_(s) and theoretical and actual yields was the highest,the relationship between theoretical yield(Y)andΔT_(s)(X)was Y=−5.6965X+27.778,R^(2)=*** withΔT_(l),ΔT_(p) andΔTc,ΔT_(s) was closely related to the main traits of plants.ΔT_(s) could better reflect the growth characteristics of rice thanΔT_(c),such as dry matter accumulation(r=−0.931),SPAD(r=0.699),N concentration(r=0.714),transpiration rate(r=−0.722).In conclusion,stem temperature was more important indicator than canopy *** temperature is a better screening index for rice breeding and cultivation management in the future.

关键词： Planting method canopy temperature organ temperature grain yield

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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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