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An analysis of physiological index of differences in drought tolerance of tomato rootstock seedlings
Xuehui Yao,Rui Yang,Fukuan Zhao,Shaohui Wang,Changbao Li,Wenchao Zhao 한국식물학회 2016 Journal of Plant Biology Vol.59 No.4
Drought is one of the most limiting factors for plant growth and development. In this study, experiments were carried out on five tomato rootstocks were subjected to water withdrawal and re-watering. Two RKN (root-knot nematodes)-and drought-dual resistant rootstocks were identified according to phenotype, physiological and molecular indexes such as the leaf relative water content (LRWC), electrolyte leakage (EL), water loss of the leaf, proline content, and increased activities of antioxidant enzymes, including peroxidase (POD), ascorbate peroxidase (APX), glutathione reductase (GR), dehydroascorbate reductase (DHAR) and the transcript levels of drought stress marker genes. Further, we preliminarily investigated the mechanism underlying improved drought tolerance arising from grafting. These results will promote the application of these rootstocks in tomato production and provide new information on the mechanism of tomato grafting.
Optical Design of a Snapshot Nonmydriatic Fundus-imaging Spectrometer Based on the Eye Model
Xuehui Zhao,Jun Chang,Wenchao Zhang,Dajiang Wang,Weilin Chen,Jiajing Cao 한국광학회 2022 Current Optics and Photonics Vol.6 No.2
Fundus images can reflect ocular diseases and systemic diseases such as glaucoma, diabetes mellitus, and hypertension. Thus, research on fundus-detection equipment is of great importance. The fundus camera has been widely used as a kind of noninvasive detection equipment. Most existing devices can only obtain two-dimensional (2D) retinal-image information, yet the fundus of the human eye also has spectral characteristics. The fundus has many pigments, and their different distributions in the eye lead to dissimilar tissue penetration for light waves, which can reflect the corresponding fundus structure. To obtain more abundant information and improve the detection level of equipment, a snapshot nonmydriatic fundus imaging spectral system, including fundus-imaging spectrometer and illumination system, is studied in this paper. The system uses a microlens array to realize snapshot technology; information can be obtained from only a single exposure. The system does not need to dilate the pupil. Hence, the operation is simple, which reduces its influence on the detected object. The system works in the visible and near-infrared bands (550–800 nm), with a volume less than 400 mm × 120 mm × 75 mm and a spectral resolution better than 6 nm.
Xiaoman Li,Wenchao Zhao,Xiaoxuan Zhou,Jiaping Feng,Yingjian Gao,Xuehui Yao,Yang Liu,Jie Liu,Rui Yang,Fukuan Zhao,Shaohui Wang 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.6
Root-knot nematodes (RKNs) (Meloidogyne spp.) are one of the most damaging crop pests and cause severeyield losses worldwide. Easier and more efficient methods are needed for assessing nematode infestations and hostplant resistance. In the present study, we combined toluidine blue staining and paraffin sectioning to observe theestablishment of giant cells (GCs; redifferentiated cells induced by nematode feeding) and the developmental status ofRKNs in tomato (Solanum lycopersicum). The number of RKNs was counted using a modified freeze-thaw countingmethod. Finally, three tomato lines with different levels of RKN resistance, but otherwise identical genetic backgrounds,were tested to verify the applicability of the combined method. The results suggested that using toluidine blue stainingcombined with paraffin sectioning and freeze-thaw counting accurately reflects the level of RKN resistance of tomato plants.
OsSPL13 controls grain size in cultivated rice
Si, Lizhen,Chen, Jiaying,Huang, Xuehui,Gong, Hao,Luo, Jianghong,Hou, Qingqing,Zhou, Taoying,Lu, Tingting,Zhu, Jingjie,Shangguan, Yingying,Chen, Erwang,Gong, Chengxiang,Zhao, Qiang,Jing, Yufeng,Zhao, Y Nature Publishing Group, a division of Macmillan P 2016 Nature genetics Vol.48 No.4
<P>Although genetic diversity has a cardinal role in domestication, abundant natural allelic variations across the rice genome that cause agronomically important differences between diverse varieties have not been fully explored. Here we implement an approach integrating genome-wide association testing with functional analysis on grain size in a diverse rice population. We report that a major quantitative trait locus, GLW7, encoding the plant-specific transcription factor OsSPL13, positively regulates cell size in the grain hull, resulting in enhanced rice grain length and yield. We determine that a tandem-repeat sequence in the 5'UTR of OsSPL13 alters its expression by affecting transcription and translation and that high expression of OsSPL13 is associated with large grains in tropical japonica rice. Further analysis indicates that the large-grain allele of GLW7 in tropical japonica rice was introgressed from indica varieties under artificial selection. Our study demonstrates that new genes can be effectively identified on the basis of genome-wide association data.</P>
Quad-Band Bandpass Filter Using Quad-Mode Stub-loaded Resonators
Haiwen Liu,Xiaomei Wang,YAN WANG,Shen Li,Yulong Zhao,Xuehui Guan 한국전자통신연구원 2014 ETRI Journal Vol.36 No.4
Compact multi-band bandpass filters using quad-mode stubloadedresonators are proposed in this letter. Firstly, a novelapproach about the mode-splitting characteristics of thequadruple-mode resonator is investigated, which can providedual-band behavior. Secondly, a quad-band filter is proposedand designed by cascading two quadruple-mode resonators;the upper one operates at 1.8/2.4 GHz (GSM- and WiMaxband)and the lower one at 1.57/2.1 GHz (GPS- and WCDMAband). Finally, the proposed filters have been fabricated. Respectable agreement between simulation and measurementverifies the validity of this design methodology.