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Search Results: 1 - 10 of 16149 matches for " Dongling Qi "
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Studies on Rubber (Hevea brasiliensis) Trees Exist Plant Type after Planting and Available Tapping Tree of Rubber Plantation in China  [PDF]
Dongling Qi, Jiannan Zhou, Guishui Xie, Zhixiang Wu
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.520318
Abstract:

Existing plant types of rubber tree after planting and available tapping tree were investigated, and there were about 28 rubber plantations with different tapping years of 8 varieties “CATAS7-33-97”, “CATAS8-79”, “CATAS7-20-59”, “PR107”, “RRIM600”, “GT1”, “INA873”, “93-114”in South China. The results showed that there were six kinds of existing plant types of rubber tree after planting of rubber plantations, which were available tapping trees, wind damaged trees, cold damaged trees, tapping panel dryness trees, absent trees and weak trees, respectively. These data investigated also showed rubber trees under available tapping, stoppage due to tapping panel dryness, absence, wind damage, cold damage and weakness were counted and calculated and made up for 72.21%, 14.75%, 5.61%, 3.86%, 2.68% and 1.89%. Tapping panel dryness trees, wind damage and absent trees are major factors for the loss of tapping rubber trees in the rubber plantations. Of these investigated varieties, available tapping trees per 100 trees of rubber plantation of “PR107”at the 1st, 12th, 14th, 16th, 20th, 24th tapping year were 96, 67, 70, 75, 66, 46 trees in Hainan planting zone, respectively. Available tapping trees per 100 trees of rubber plantation of “RRIM600”at the 9th, 15th, 20th, 22nd tapping year were 88, 62, 55, 36 trees in Yunnan planting zone, respectively.

Preliminary Study on Seedling Growth Rhythm and Grey Correlation Analysis of Rubber (Hevea brasiliensis) Seedlings in Danzhou District, Hainan  [PDF]
Dongling Qi, Chuan Yang, Guishui Xie, Zhixiang Wu, Zhixiang Wu
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.526404
Abstract: The rubber tree physiological and ecological process quantitatively described by using mathematical method is an important means to the analysis of rubber tree growth process and mechanism. The study on growth simulation model of rubber tree will lay the foundation for the application of rubber tree cultivation intelligent decision system. A Richards equation was formulated to describe the height and stem diameter growth dynamics of the annual rubber seedlings. An area correlation analysis was done according to the closeness of the observed parameters to the dynamic curve on the gray system composed of the seedling growth increment and the meteorological factors including aerial temperature, precipitation and solar radiation hours that influence upon the seedling growth. The results showed that rubber seedling response fitted the Richards equation quite well. The growth increment displayed a distinct alternation of \"slow—fast—slow— fast—slow\" rhythm. The growth course of the seedlings might be partitioned into three periods of time by the sequential clustering analysis, namely pre-growing, fast-growing, late-growing stage. The tray correlation analysis revealed that air temperature had the most significant influence while precipitation had the least impact on height growth of the rubber seedlings. In conclusion, the air temperature had the most significant influence while solar radiation hours had the least impact on stem diameter growth of the rubber seedlings.
A Simplified Cultivation Technology for Disbudding of (Hevea brasiliensis) Stock Seedling  [PDF]
Dongling Qi, Guishui Xie, Rui Sun, Zhixiang Wu
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.611170
Abstract: A new simplified cultivation technology which could facilitate rootstock bud of rubber stock seedling was studied. The advantages of the technology were that it could be was simple to operate and used easily. Using telescopic handle and arcuate edge effectively could reduce labor intensity of seedling breeding workers and improve the speed of disbudding. Further, bag budling could be promoted healthy growth and its survival rate could be improved with the technology.
Seasonal Changes Impact on Growth of Rubber (Hevea brasiliensis) Seedlings under Different Cultivation  [PDF]
Dongling Qi, Guishui Xie, Zhixiang Wu
Open Journal of Forestry (OJF) , 2019, DOI: 10.4236/ojf.2019.94022
Abstract: The vegetative growth of rubber tree is an important basis for rubber tree cultivation and economic management. Stem diameter and height growth patterns of rubber seedlings and the seasonal variability are still poorly understood. Studying the annual growth patterns and seasonal variation of rubber seedling will help understanding biological characteristics of rubber tree and provide a reference for field cultivation and management. Height growth and stem diameter of field-sown rubber seedlings cultivation and polybag-raised cultivation all displayed a distinct annual pattern of “slow-fast-slow”. Height growth and stem diameter growth response fitted the logistic equation preferably, supporting the observed pattern. Fast-growth of plant height for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation occurred from June to November and May to November, respectively. This period saw the greatest accumulations of plant height growth for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation accounting for 83.99% and 86.65% of total growth, respectively. Fast-growth of stem diameter for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation occurred from June to November and May to November, respectively. This period saw the greatest accumulations of stem growth for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation accounting for 86.71% and 84.60% of total growth, respectively. Polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation for the whole year had nine extension units and each month had one extension unit from May to November. Extension unit of for the whole year did not stop period and plant height growth rate has the seasonal difference. However, leaf phenophase of field-sown rubber seedlings cultivation was earlier than that of polybag-raised rubber seedlings cultivation and each extension unit of field-sown rubber seedlings cultivation was greater than that of poly-bag-raised rubber seedlings cultivation. The precipitation had the greatest impact on seedlings growth under different cultivation. There was no period annually in which height growth and stem diameter growth did not occur and the fastest growth occurred during the rainy season. Plant height and stem diameter of rubber seedlings under different cultivation showed isogony phenomenon. Extension unit and leaf phenophase of polybag-raised rubber seedlings and field-sown rubber seedlings showed consistency and
Genetic structure and eco-geographical differentiation of cultivated Hsien rice (Oryza sativa L. subsp. indica) in China revealed by microsatellites
DongLing Zhang,HongLiang Zhang,YongWen Qi,MeiXing Wang,JunLi Sun,Li Ding,ZiChao Li
Chinese Science Bulletin , 2013, DOI: 10.1007/s11434-012-5396-4
Abstract: Indica is not only an important rice subspecies widely planted in Asia and the rest of the world, but it is also the genetic background of the majority of hybrid varieties in China. Studies on genetic structure and genetic diversity in indica germplasm resources are important for the classification and utilization of cultivated rice in China. Using a genetically representative core collection comprising 1482 Chinese indica landraces, we analysed the genetic structure, geographic differentiation and diversity. Model-based structure analysis of varieties within three ecotypes revealed nine eco-geographical types partially accordant with certain ecological zones in China. Differentiation of eco-geographical types was attributed to local ecological adaption and physical isolation. These groups may be useful for developing heterotic groups of indica. To facilitate the identification of different ecotypes and eco-geographical types, we identified characteristic SSR alleles of each ecotype and eco-geographical type and a rapid index of discrimination based on characteristic alleles. The characteristic alleles and rapid discrimination index may guide development of heterotic groups, and selection of hybrid parents.
Geographical genetic diversity and divergence of common wild rice (O. rufipogon Griff.) in China
MeiXing Wang,HongLiang Zhang,DongLing Zhang,DaJian Pan,DaoYuan Li,ZhiLan Fan,YongWen Qi,JunLi Sun,QingWen Yang,Chen Li,ZiChao Li
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0491-2
Abstract: Using 36 SSR markers and 889 accessions of common wild rice in China, the genetic diversity and the divergence among different geographical populations are investigated. Guangdong Province has the largest number of alleles, which account for 84% of the total alleles detected in the study, followed by Guangxi Province. The Nei’s gene diversity indices, from high to low, are in the sequence of Hainan, Guangdong, Guangxi, Fujian, Hunan, Jiangxi, and Yunnan provinces. Two genetic diversity centers of Chinese common wild rice are detected on the basis of geographic analysis, i.e., the region covering Boluo, Zijin, Lufeng, Haifeng, Huidong and Huiyang counties of Guangdong Province and the region covering Yongning, Longan, Laibin and Guigang counties of Guangxi Province. The common wild rice in Yunnan, Hunan, Jiangxi, and Fujian provinces are diverged into respectively independent populations with relatively large genetic distances, whereas, those in Hainan, Guangdong and Guangxi provinces have relatively low genetic divergence. Under the condition of geographic separation, natural selection is considered as one of the primary forces contributing to the divergence of common wild rice in China.
Genetic structure and diversity of Oryza sativa L. in Guizhou, China
DongLing Zhang,HongLiang Zhang,XingHua Wei,YongWen Qi,MeiXing Wang,JunLi Sun,Li Ding,ShengXiang Tang,Zong’En Qiu,YongSheng Cao,XiangKun Wang,ZiChao Li
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0063-x
Abstract: Preserving many kinds of rice resources and rich variations, Guizhou Province is one of the districts with the highest genetic diversity of cultivated rice (Oryza sativa L.) in China. In the current research, genetic diversity and structure of 537 accessions of cultivated rice from Guizhou were studied using 36 microsatellite markers and 39 phenotypic characters. The results showed that the model-based genetic structure was the same as genetic-distance-based one using SSRs but somewhat different from the documented classification (mainly based on phenotype) of two subspecies. The accessions being classified into indica by phenotype but japonica by genetic structure were much more than that being classified into japonica by phenotype but indica by genetic structure. Like Ding Ying’s taxonomic system of cultivated rice, the subspecific differentiation was the most distinct differentiation within cultivated rice. But the differentiation within indica or japonica population was different: japonica presented clearer differentiation between soil-watery ecotypes than indica, and indica presented clearer differentiation between seasonal ecotypes than japonica. Cultivated rices in Guizhou revealed high genetic diversity at both DNA and phenotypic levels. Possessing the highest genetic diversity and all the necessary conditions as a center of genetic diversity, region Southwestern of Guizhou was suggested as the center of genetic diversity of O. sativa L. from Guizhou.
Genetic diversity of rice cultivars (Oryza sativa L.) in China and the temporal trends in recent fifty years
Yongwen Qi,Dongling Zhang,Hongliang Zhang,Meixing Wang,Junli Sun,Xinghua Wei,Zongen Qiu,Shenxiang Tang,Yongsheng Cao,Xiangkun Wang,Zichao Li
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-0681-8
Abstract: To understand geographical distribution of the genetic diversity of rice cultivars (Oryza sativa L.) and its trends in recent fifty years in China, 453 accessions were analyzed by 36 microsatellites loci and 42 phenotypic traits. Results revealed that the genetic diversity by SSRs is highly consistent with that by phenotypic traits and the genetic diversity of indica cultivars was higher than that of japonica cultivars; the genetic diversity of cultivars declined from 1950s to 1980s and then increased greatly; among the six rice ecological zones (REZs), genetic diversity of REZ II was the highest and those of REZ V and REZ VI were the lowest at both DNA and phenotypic level. Jiangsu and Jiangxi provinces in the middle and lower reaches of Yangtze River and Sichuan province in southwest of China were the areas with the highest genetic diversity. Breeders in REZ V which is an important japonica rice area but with very low genetic diversity should explore more gene resources to widen the genetic backgrounds of cultivars.
Genetic diversity of rice cultivars (Oryza sativa L.) in China and the temporal trends in recent fifty years
Genetic diversity of rice cultivars (Oryza sativa L.) in China and the temporal trends in recent fifty years

QI Yongwen,ZHANG Dongling,ZHANG Hongliang,WANG Meixing,SUN Junli,WEI Xinghua,QIU Zongen,TANG Shengxiang,CAO Yongsheng,WANG Xiangkun,LI Zichao,
QI
,Yonawen,ZHANG,Dongling,ZHANG,Hongliang,WANG,Meixing,SUN,Junli,WEI,Xinghua,QIU,Zongen,TANG,Shengxiang,CAO,Yongsheng,WANG,Xiangkun,LI,Zichao

科学通报(英文版) , 2006,
Abstract: To understand geographical distribution of the genetic diversity of rice cultivars {Oryza sativa L.) and its trends in recent fifty years in China, 453 ' accessions were analyzed by 36 microsatellites loci and 42 phenotypic traits. Results revealed that the genetic diversity by SSRs is highly consistent with that by phenotypic traits and the genetic diversity of indica cultivars was higher than that of japonica cultivars; the genetic diversity of cultivars declined from 1950s to 1980s and then increased greatly; among the six rice ecological zones (REZs), genetic diversity of REZTl was the highest and those of REZV and REZVT were the lowest at both DNA and phenotypic level. Jiangsu and Jiangxi provinces in the middle and lower reaches of Yangtze River and Sichuan province in southwest of China were the areas with the highest genetic diversity. Breeders in REZV which is an important japonica rice area but with very low genetic diversity should explore more gene resources to widen the genetic backgrounds of cultivars.
Kanggan Granule Ameliorates Dexamethasone-Induced Immunosuppression in Mice  [PDF]
Yumiao Gan, Manxia Gu, Dongling Liu, Hongjing Zhou, Chenye Zeng, Tingting Yang, Hui Li, Funeng Geng, Junrong Du
Journal of Biosciences and Medicines (JBM) , 2019, DOI: 10.4236/jbm.2019.73008
Abstract: Objective: This study was to investigate the effect of the Chinese herbal compound Kanggan granule (KG) on immune function in a mouse model of immunosuppression and its possible mechanism of action. Method: ICR mice were randomly divided into a normal control group (untreated non-immunosuppressed, Control), untreated immunosuppressed group (Model), positive control group (immunosuppressed and treated with 1.6 g/kg astragalus granule [AG]), high-dose KG group (immunosuppressed and treated with 24 g/kg, KG-24), and low-dose KG group (immunosuppressed and treated with 6 g/kg, KG-6). Each group received intragastric administration once daily for 7 days. Immunosuppression was induced by an intraperitoneal injection of dexamethasone (25 mg/kg) once daily beginning on day 1 for 3 days. To illuminate the mechanism of immunomodulatory, we studied the effects of KG on nonspecific immunity, humoral immunity and cellular immunity in mice respectively. Results: KG improved organ weights and improved the phagocytic ability of mononuclear macrophages in immunosuppressed mice (p < 0.01 or p < 0.05). The proliferation of spleen lymphocytes and number of peripheral blood leukocytes were enhanced after KG treatment in immunosuppressed mice (p < 0.05). KG increased the CD4+/CD8+ ratio in immunosuppressed mice (p < 0.01) and increased serum IL-2 and IgG levels (p < 0.01). Conclusions: KG can improve immune function in immunosuppressed mice. Nonspecific immunity, humoral immunity, and cellular immunity were all enhanced.
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