Bao Gui Zhang
China Agricultural University
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Featured researches published by Bao Gui Zhang.
Annals of Botany | 2011
Haiwen Wu; Marc Jaeger; Mao Wang; Baoguo Li; Bao Gui Zhang
BACKGROUND AND AIMS The capacity of a plant to absorb and transport water and nutrients depends on anatomical structures within the roots and their co-ordination. However, most descriptions of root anatomical structure are limited to 2-D cross-sections, providing little information on 3-D spatial relationships and hardly anything on their temporal evolution. Three-dimensional reconstruction and visualization of root anatomical structures can illustrate spatial co-ordination among cells and tissues and provide new insights and understanding of the interrelation between structure and function. METHODS Classical paraffin serial-section methods, image processing, computer-aided 3-D reconstruction and 3-D visualization techniques were combined to analyse spatial relationships among metaxylem vessels, passage cells and lateral roots in nodal roots of winter wheat (Triticum aestivum). KEY RESULTS 3-D reconstruction demonstrated that metaxylem vessels were neither parallel, nor did they run directly along the root axis from the root base to the root tip; rather they underwent substitution and transition. Most vessels were connected to pre-existent or newly formed vessels by pits on their lateral walls. The spatial distributions of both passage cells and lateral roots exhibited similar position-dependent patterns. In the transverse plane, the passage cells occurred opposite the poles of the protoxylem and the lateral roots opposite those of the protophloem. Along the axis of a young root segment, the passage cells were arranged in short and discontinuous longitudinal files, thus as the tissues mature, the sequence in which the passage cells lose their transport function is not basipetal. In older segments, passage cells decreased drastically in number and coexisted with lateral roots. The spatial distribution of lateral roots was similar to that of the passage cells, mirroring their similar functions as lateral pathways for water and nutrient transport to the stele. CONCLUSIONS With the 3-D reconstruction and visualization techniques developed here, the spatial relationships between vessels, passage cells and lateral roots and the temporal evolution of these relationships can be described. The technique helps to illustrate synchronization and spatial co-ordination among the roots radial and axial pathways for water and nutrient transport and the interdependence of structure and function in the root.
Annals of Botany | 2011
Mengzhen Kang; Lili Yang; Bao Gui Zhang; Philippe De Reffye
BACKGROUND AND AIMS It is widely accepted that fruit-set in plants is related to source-sink ratio. Despite its critical importance to yield, prediction of fruit-set remains an ongoing problem in crop models. Functional-structural plant models are potentially able to simulate organ-level plasticity of plants. To predict fruit-set, the quantitative link between source-sink ratio and fruit-set probability is analysed here via a functional-structural plant model, GreenLab. METHODS Two experiments, each with four plant densities, were carried out in a solar greenhouse during two growth seasons (started in spring and autumn). Dynamic fruit-set probability was estimated by frequent observation on inflorescences. Source and sink parameter values were obtained by fitting GreenLab outputs for the biomass of plant parts (lamina, petiole, internode, fruit), at both organ and plant level, to corresponding destructive measurements at six dates from real plants. The dynamic source-sink ratio was calculated as the ratio between biomass production and plant demand (sum of all organ sink strength) per growth cycle, both being outputs of the model. KEY RESULTS AND CONCLUSIONS Most sink parameters were stable over multiple planting densities and seasons. From planting, source-sink ratio increased in the vegetative stage and reached a peak after fruit-set commenced, followed by a decrease of leaf appearance rate. Fruit-set probability was correlated with the source-sink ratio after the appearance of flower buds. The relationship between fruit-set probability and the most correlated source-sink ratio could be quantified by a single regression line for both experiments. The current work paves the way to predicting dynamic fruit-set using a functional structure model.
2009 Third International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications | 2009
Haiwen Wu; Marc Jaeger; Mao Wang; Baoguo Li; Bao Gui Zhang
Descriptions of root internal structure are often limited to 2D cross-sections, with little information about three dimensions, and the evolution of xylem vessels along root axis has not been clearly presented. A computer-aided 3D-reconstrution method was developed based on paraffin serial slices techniques. The image processing protocol involved slice images alignment, registration, and 3D reconstruction. The stability of this approach was quantified and proven to be satisfactory. The 3D reconstruction conducted on wheat nodal roots illustrated that metaxylem vessel number decreased along root axis. Most vessels connected to the existent or new-formed vessels by lateral cell walls before disappearing. Thus metaxylem vessels in longitudinal profiles were not straightforward. The proposed imaging technique was low cost. It allowed various visualizations and quantitative comparisons of root structures. In the ongoing work, the technique is used to illustrate the spatial coordination of the radial pathway (passage cells, lateral roots), and longitudinal conduits (xylem vessels) of water and nutrient transport.
2009 Third International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications | 2009
Xiujuan Wang; Amélie Mathieu; Paul-Henry Cournède; Jean-Michel Allirand; Alexandra Jullien; Philippe De Reffye; Bao Gui Zhang
The number of seeds per pod is an important determinant of yield. New clues of yield and seed quality improvement can be provided by studying the relation between the developmental patterns of floral organs and seed production. In this article, a probabilistic model of plant inflorescence fertility is presented. From a biological point of view, seed development can be viewed as the combination of several physiological processes that can be modeled with stochastic laws. Experiments were made on oilseed rape in Grignon (France) in 2008 to calibrate the model. A Generalized Least Square method was implemented to estimate the model parameters. The variations of parameters were analyzed according to the position of flowers. Furthermore, we discussed the causes that lead to the variation of seed production within the inflorescence and related them to our model. The model reproduces well the distribution of the number of ovules per flower as well as the number of final seeds per pod. We deduced a law to describe the distribution of pollen grains on the stigma that is quite difficult to be observed experimentally. This model is the first step towards a dynamic model taking into account the complexity of the oilseed rape architecture, which is aimed to quantify the influence of pollination or trophic competition on seed production.
Field Crops Research | 2011
Xiujuan Wang; Amélie Mathieu; Paul-Henry Cournède; Jean Michel Allirand; Alexandra Jullien; Philippe De Reffye; Bao Gui Zhang
International Symposium on Plant Growth Modeling, Simulation, Visualization and their Applications - PMA'03 | 2003
Bao Gui Zhang; Philippe De Reffye; L. Liu; Mengzhen Kang; Baoguo Li
Third International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications (PMA09) | 2009
Xiujuan Wang; Amélie Mathieu; Paul-Hendry Cournède; Jean Michel Allirand; Alexandra Jullien; Philippe De Reffye; Bao Gui Zhang
Mathematical Modelling of Natural Phenomena | 2012
Alexandre Mathieu; Véronique Letort; Paul-Henry Cournède; Bao Gui Zhang; Patrick Heuret; Philippe De Reffye
6. International Workshop | 2010
Xiujuan Wang; Amélie Mathieu; Paul-Henry Cournède; Jean-Michel Allirand; Alexandra Jullien; Philippe De Reffye; Bao Gui Zhang
FSPM2013 Proceedings | 2013
Xiujuan Wang; Mengzhen Kang; Lili Yang; Bao Gui Zhang; Philippe De Reffye