White lupin （Lupinus albus） exhibits strong root morphological and physiological responses to phosphorus （P） deficiency and auxin treatments, but the interactive effects of P and auxin in regulating root morpholog...White lupin （Lupinus albus） exhibits strong root morphological and physiological responses to phosphorus （P） deficiency and auxin treatments, but the interactive effects of P and auxin in regulating root morphological and physiological traits are not fully understood. This study aimed to assess white lupin root traits as influenced by P （0 or 250 ~tmol L-1） and auxin （10=8 mol L-1 NAA） in nutrient solution. Both P deficiency and auxin treatments significantly altered root morphological traits, as evi- denced by reduced taproot length, increased number and density of first-order lateral roots, and enhanced cluster-root for- marion. Changes in root physiological traits were also observed, i.e., increased proton, citrate, and acid phosphatase exudation. Exogenous auxin enhanced root responses and sensitivity to P deficiency. A significant interplay exists between P and auxin in the regulation of root morphological and physiological traits. Principal component analysis showed that P availability ex- plained 64.8% and auxin addition 21.3% of the total variation in root trait parameters, indicating that P availability is much more important than auxin in modifying root responses of white lupin. This suggests that white lupin can coordinate root mor- phological and physiological responses to enhance acquisition of P resources, with an optimal trade-off between root morpho- logical and physiological traits regulated by external stimuli such as P availability and auxin.展开更多
应用根系分析软件(WinRHIZO)获得了大灰藓(Hypnum plumaeforme Wils.)、大羽藓(Thuidium cymbifolium(Dozy et Molk.)Dozy et Molk.)和密叶绢藓(Entodon compressus(Hedw.)Müll.Hal.)32份标本的配子体枝条长度、投影面积、表面积...应用根系分析软件(WinRHIZO)获得了大灰藓(Hypnum plumaeforme Wils.)、大羽藓(Thuidium cymbifolium(Dozy et Molk.)Dozy et Molk.)和密叶绢藓(Entodon compressus(Hedw.)Müll.Hal.)32份标本的配子体枝条长度、投影面积、表面积、枝条平均直径、长度/体积、总体积、枝尖数、枝的分叉数、枝交叠数等10个形态参数,基于这些数据,应用聚类分析和无度量多维标定生成了这32份标本的排序和聚类图.聚类与排序结果表明:32份标本可以分成3组,与大灰藓、大羽藓和密叶绢藓有很好的对应性.单因素方差分析表明这32份标本的10个形态指标在大灰藓、密叶绢藓、大羽藓之间多数存在显著差异.因此,配子体的这10个性状在研究的3类侧蒴藓类植物中具有相对的稳定性,根系分析仪在侧蒴藓类植物生理生态学研究上具有潜在的应用价值.展开更多
To reveal the genetic basis of potassium use efficiency(KUE) in rapeseed, root morphology(RM), biomass and KUE-related traits were measured in a recombinant inbred line population with 175 F7 lines that were subjected...To reveal the genetic basis of potassium use efficiency(KUE) in rapeseed, root morphology(RM), biomass and KUE-related traits were measured in a recombinant inbred line population with 175 F7 lines that were subjected to high-potassium(HK) and low-potassium(LK) treatments by hydroponics. A total of 109 significant QTLs were identified to be associated with the examined traits. Sixty-one of these QTLs were integrated into nine stable QTLs. The higher heritability for RM and biomass traits and lower heritability for KUE-related traits, as well as nine stable QTLs for RM traits and only two for KUE-related traits,suggested that regulating RM traits would be more effective than selecting KUE traits directly to improve KUE by markerassisted selection. Furthermore, the integration of stable QTLs identified in the HK, LK, high-nitrogen(HN) and low-nitrogen(LN) conditions gave 10 QTL clusters. Seven of these clusters were classified into major QTLs that explained 7.4%–23.7% of the total phenotypic variation. Five of the major QTL clusters were detected under all of the treated conditions, and four clusters were specifically detected under the LK and LN conditions. These common and specific QTL clusters may be useful for the simultaneous improvement of multiple traits by marker-assisted selection.展开更多
The matching relationship between the spatial structure of cotton cluster root systems and soil-wetting patterns under mulched drip irrigation forms the theoretical basis for the technical design of mulched drip irrig...The matching relationship between the spatial structure of cotton cluster root systems and soil-wetting patterns under mulched drip irrigation forms the theoretical basis for the technical design of mulched drip irrigation.A 2-year field experiment was conducted,in which different soil-wetting patterns were produced by setting different emitter discharge rates.The envelopes of cotton cluster root length densities were derived using the topological methodology and used to examine the effects of different soil-wetting patterns on the spatial structure of root systems and water uptake capacity within row spaces.The results showed that the root systems in rows of cotton grown under narrower and deeper soil-wetting patterns exhibited a single-peak distribution,while those under wider and shallower soil-wetting patterns exhibited a two-peak distribution.Furthermore,cotton rows grown near mulch edges experienced lower moisture stress,and wider and shallower soil-wetting patterns contributed to greater root growth rates in the vertical direction and resulted in more even potential water uptake capacities.The findings of this study revealed that wider and shallower soil-wetting patterns were more desirable for mulched drip irrigation of cotton and should be considered in the technical design of drip irrigation systems.展开更多
基金Progress of Projects Supported by NSFCsupported by the National Natural Science Foundation of China (30925024, 30890131, 30871591)+3 种基金the Beijing Natural Science Foundation (6122021)the innovative group grant of NSFC (31121062)Ministry of Science and Technology of China (2013CB127402)the Innovation Fund for Graduate Student of China Agricultural University(KYCX2011040)
文摘White lupin （Lupinus albus） exhibits strong root morphological and physiological responses to phosphorus （P） deficiency and auxin treatments, but the interactive effects of P and auxin in regulating root morphological and physiological traits are not fully understood. This study aimed to assess white lupin root traits as influenced by P （0 or 250 ~tmol L-1） and auxin （10=8 mol L-1 NAA） in nutrient solution. Both P deficiency and auxin treatments significantly altered root morphological traits, as evi- denced by reduced taproot length, increased number and density of first-order lateral roots, and enhanced cluster-root for- marion. Changes in root physiological traits were also observed, i.e., increased proton, citrate, and acid phosphatase exudation. Exogenous auxin enhanced root responses and sensitivity to P deficiency. A significant interplay exists between P and auxin in the regulation of root morphological and physiological traits. Principal component analysis showed that P availability ex- plained 64.8% and auxin addition 21.3% of the total variation in root trait parameters, indicating that P availability is much more important than auxin in modifying root responses of white lupin. This suggests that white lupin can coordinate root mor- phological and physiological responses to enhance acquisition of P resources, with an optimal trade-off between root morpho- logical and physiological traits regulated by external stimuli such as P availability and auxin.
文摘应用根系分析软件(WinRHIZO)获得了大灰藓(Hypnum plumaeforme Wils.)、大羽藓(Thuidium cymbifolium(Dozy et Molk.)Dozy et Molk.)和密叶绢藓(Entodon compressus(Hedw.)Müll.Hal.)32份标本的配子体枝条长度、投影面积、表面积、枝条平均直径、长度/体积、总体积、枝尖数、枝的分叉数、枝交叠数等10个形态参数,基于这些数据,应用聚类分析和无度量多维标定生成了这32份标本的排序和聚类图.聚类与排序结果表明:32份标本可以分成3组,与大灰藓、大羽藓和密叶绢藓有很好的对应性.单因素方差分析表明这32份标本的10个形态指标在大灰藓、密叶绢藓、大羽藓之间多数存在显著差异.因此,配子体的这10个性状在研究的3类侧蒴藓类植物中具有相对的稳定性,根系分析仪在侧蒴藓类植物生理生态学研究上具有潜在的应用价值.
基金supported by the National Key Research and Development Program of China (2016YFD0100200)the Natural Foundation of Hubei Province (2018CFB246)+2 种基金the National Natural Science Foundation of China (31501820)Rapeseed Industry Technology System (CARS-13)the Agricultural Science and Technology Innovation Project (CAAS-ASTIP-2013-OCRI)
文摘To reveal the genetic basis of potassium use efficiency(KUE) in rapeseed, root morphology(RM), biomass and KUE-related traits were measured in a recombinant inbred line population with 175 F7 lines that were subjected to high-potassium(HK) and low-potassium(LK) treatments by hydroponics. A total of 109 significant QTLs were identified to be associated with the examined traits. Sixty-one of these QTLs were integrated into nine stable QTLs. The higher heritability for RM and biomass traits and lower heritability for KUE-related traits, as well as nine stable QTLs for RM traits and only two for KUE-related traits,suggested that regulating RM traits would be more effective than selecting KUE traits directly to improve KUE by markerassisted selection. Furthermore, the integration of stable QTLs identified in the HK, LK, high-nitrogen(HN) and low-nitrogen(LN) conditions gave 10 QTL clusters. Seven of these clusters were classified into major QTLs that explained 7.4%–23.7% of the total phenotypic variation. Five of the major QTL clusters were detected under all of the treated conditions, and four clusters were specifically detected under the LK and LN conditions. These common and specific QTL clusters may be useful for the simultaneous improvement of multiple traits by marker-assisted selection.
基金This study was supported by the National Natural Science Foundation of China(Grant No.51790533(a major project)and No.51709266)the National Key Research and Development Program of China(Grant No.2017YFC0403303)the Central Public-interest Scientific Institution Basal Research Fund(Farmland Irrigation Research Institute,CAAS)(FIRI2016-19 and FIRI2016-16).
文摘The matching relationship between the spatial structure of cotton cluster root systems and soil-wetting patterns under mulched drip irrigation forms the theoretical basis for the technical design of mulched drip irrigation.A 2-year field experiment was conducted,in which different soil-wetting patterns were produced by setting different emitter discharge rates.The envelopes of cotton cluster root length densities were derived using the topological methodology and used to examine the effects of different soil-wetting patterns on the spatial structure of root systems and water uptake capacity within row spaces.The results showed that the root systems in rows of cotton grown under narrower and deeper soil-wetting patterns exhibited a single-peak distribution,while those under wider and shallower soil-wetting patterns exhibited a two-peak distribution.Furthermore,cotton rows grown near mulch edges experienced lower moisture stress,and wider and shallower soil-wetting patterns contributed to greater root growth rates in the vertical direction and resulted in more even potential water uptake capacities.The findings of this study revealed that wider and shallower soil-wetting patterns were more desirable for mulched drip irrigation of cotton and should be considered in the technical design of drip irrigation systems.
