Jinxiu 206 is a mid-early maize variety bred in the Maize Research Insti- tute, Shanxi Academy of Agricultural Sciences, derived from CC15-2 and Chang 7-2 Lv as male and female parents. The variety test in 2007-2012 s...Jinxiu 206 is a mid-early maize variety bred in the Maize Research Insti- tute, Shanxi Academy of Agricultural Sciences, derived from CC15-2 and Chang 7-2 Lv as male and female parents. The variety test in 2007-2012 showed that Jinxiu 206 has strong resistance to disease and stress, excellent quality and high stable yield, and is suitable for early spring maize producing areas.展开更多
This paper underscores the need for new plausible myths that redefine gender relations in an attempt to revalue female assertion, ethical values, and human development. This creative process presents a different persp...This paper underscores the need for new plausible myths that redefine gender relations in an attempt to revalue female assertion, ethical values, and human development. This creative process presents a different perspective from the views of some feminist theorists who have seen myth as a regressive and oppressive structure. The focus, in this paper, is to illustrate how in her chant-novel It Shah Be of Jasper and Coral Liking appropriates the productive force of myths through the misovire consciousness and ritual structure for her gender politics and for promoting ethical values and the culture of human development. In this regard, she decodes existing negative myths and reconstructs new gender myths that redefine gender relations, celebrate what she calls women＇s ＂cosmic force＂ and through ritual cleansing, reinvents a new language of beauty and a new race of Jasper and Coral. Thus, guided by the tenets of deconstruetion and the gender relations frameworks, this paper defends the thesis that Liking＇s chant-novel through myth invention and revision combines and fuses traditional and modem aesthetics, thematic and structural elements that she uses to deconstruct social and gender relations. The contention is that in negotiating plausible gender relations for men and women in Africa, Liking＇s story and structure incorporate the cleansing, cathartic effect of Bassa ritual performance into the narrative.展开更多
Before farmers can benefit from new improved maize varieties with novel genetic information, new maize varieties have to undergo performance testing, registration and approval. The registration procedures require that...Before farmers can benefit from new improved maize varieties with novel genetic information, new maize varieties have to undergo performance testing, registration and approval. The registration procedures require that new maize varieties must pass the tests for value for cultivation and use （VCU） and standardized tests for distinctness, uniformity and stability （DUS）. To meet the minimum requirements for variety release, public and private sector maize breeding programs routinely assemble breeding nurseries and evaluate variety performance in National and Regional Performance Trials （NRPT） with the objective of generating important agronomic data to identify the best maize varieties for release. In spite of intensive variety evaluation in regional and national trials, only few maize varieties have been registered and released annually in sub-Saharan Africa （SSA） denying farmers access to new improved varieties. The purpose of this study was to identify constraints hampering the registration and release of elite maize gennplasm and make recommends on how to quicken the deployment of elite germplasm to smallholders＇ farmers. A survey was conducted on the varietal testing and release systems in 14 selected countries （Angola, Benin, Ethiopia, Malawi, Ghana, Mali, Mozambique, Nigeria, Tanzania, Kenya, South Africa, Uganda, Zambia, and Zimbabwe） in SSA. The results from the study show that regulations on variety testing and release procedures in the various countries are overlapping and rigid hindering the deployment and commercialization of new improved maize germplasm. The study also showed that varietal release rates fluctuated between countries with South Africa having the highest number of varietal release rates per year and some countries failing to release a single variety per year.展开更多
This paper divides the genus Limnophora R.-D., into f ive species-group, s, namely L.triangula -gr., L.spoliata -gr., L.exi gua -gr., L.nigripes -gr. and L.scrupulosa -gr.. A key to each group i s provided and three n...This paper divides the genus Limnophora R.-D., into f ive species-group, s, namely L.triangula -gr., L.spoliata -gr., L.exi gua -gr., L.nigripes -gr. and L.scrupulosa -gr.. A key to each group i s provided and three new species from Yunnan Province, L.longispatula sp.nov. , L.yulongxueshanna sp.nov.and L.yunnanensis sp.nov.,described.Type speci mens are deposited in the Institute of Entomology,Shenyang Normal University.展开更多
Root growth has a fundamental role in nitrogen （N） use efficiency. Nevertheless, little is known about how modem breeding progress has affected root growth and its responses to N supply. The root and shoot growth of...Root growth has a fundamental role in nitrogen （N） use efficiency. Nevertheless, little is known about how modem breeding progress has affected root growth and its responses to N supply. The root and shoot growth of a core set of 11 representative Chinese maize （Zea mays L.） hybrids released between 1973 and 2009 were investigated under high N （4 mmol L^-1, HN） and low N （0.04 mmol L^-1, LN） levels in a solution culture system. Compared with LN, HN treatment decreased root dry weight （RDW）, the root： shoot ratio （R/S）, and the relative growth rate for root dry weight （RGRroot）, but increased the total root length （TRL） and the total lateral root length （LRL）. The total axial root length （ARL） per plant was reduced under HN, mostly in hybrids released before the 1990s. The number of seminal roots （SRN） was largely unaffected by different N levels. More recently released hybrids showed higher relative growth rates in the shoot under both HN and LN. However, the roots only showed increased RGR under HN treatment. Correspondingly, there was a positive linear relationship with the year of hybrid release for TRL, LRL and ARL under HN treatment. Together, these results suggest that while shoot growth of maize has improved, its root growth has only improved under high N conditions over the last 36 years of selective breeding in China. Improving root growth under LN conditions may be necessary to increase the N use efficiency of maize.展开更多
基金Supported by Special Fund for Crop Seed Industry Development of Shanxi Province(2014ZYFZ-07)Maize Breeding Engineering of Shangxi Academy of Agricultural Sciences during the Thirteenth Five-year Plan Period(16yzgc110)~~
文摘Jinxiu 206 is a mid-early maize variety bred in the Maize Research Insti- tute, Shanxi Academy of Agricultural Sciences, derived from CC15-2 and Chang 7-2 Lv as male and female parents. The variety test in 2007-2012 showed that Jinxiu 206 has strong resistance to disease and stress, excellent quality and high stable yield, and is suitable for early spring maize producing areas.
文摘This paper underscores the need for new plausible myths that redefine gender relations in an attempt to revalue female assertion, ethical values, and human development. This creative process presents a different perspective from the views of some feminist theorists who have seen myth as a regressive and oppressive structure. The focus, in this paper, is to illustrate how in her chant-novel It Shah Be of Jasper and Coral Liking appropriates the productive force of myths through the misovire consciousness and ritual structure for her gender politics and for promoting ethical values and the culture of human development. In this regard, she decodes existing negative myths and reconstructs new gender myths that redefine gender relations, celebrate what she calls women＇s ＂cosmic force＂ and through ritual cleansing, reinvents a new language of beauty and a new race of Jasper and Coral. Thus, guided by the tenets of deconstruetion and the gender relations frameworks, this paper defends the thesis that Liking＇s chant-novel through myth invention and revision combines and fuses traditional and modem aesthetics, thematic and structural elements that she uses to deconstruct social and gender relations. The contention is that in negotiating plausible gender relations for men and women in Africa, Liking＇s story and structure incorporate the cleansing, cathartic effect of Bassa ritual performance into the narrative.
文摘Before farmers can benefit from new improved maize varieties with novel genetic information, new maize varieties have to undergo performance testing, registration and approval. The registration procedures require that new maize varieties must pass the tests for value for cultivation and use （VCU） and standardized tests for distinctness, uniformity and stability （DUS）. To meet the minimum requirements for variety release, public and private sector maize breeding programs routinely assemble breeding nurseries and evaluate variety performance in National and Regional Performance Trials （NRPT） with the objective of generating important agronomic data to identify the best maize varieties for release. In spite of intensive variety evaluation in regional and national trials, only few maize varieties have been registered and released annually in sub-Saharan Africa （SSA） denying farmers access to new improved varieties. The purpose of this study was to identify constraints hampering the registration and release of elite maize gennplasm and make recommends on how to quicken the deployment of elite germplasm to smallholders＇ farmers. A survey was conducted on the varietal testing and release systems in 14 selected countries （Angola, Benin, Ethiopia, Malawi, Ghana, Mali, Mozambique, Nigeria, Tanzania, Kenya, South Africa, Uganda, Zambia, and Zimbabwe） in SSA. The results from the study show that regulations on variety testing and release procedures in the various countries are overlapping and rigid hindering the deployment and commercialization of new improved maize germplasm. The study also showed that varietal release rates fluctuated between countries with South Africa having the highest number of varietal release rates per year and some countries failing to release a single variety per year.
文摘This paper divides the genus Limnophora R.-D., into f ive species-group, s, namely L.triangula -gr., L.spoliata -gr., L.exi gua -gr., L.nigripes -gr. and L.scrupulosa -gr.. A key to each group i s provided and three new species from Yunnan Province, L.longispatula sp.nov. , L.yulongxueshanna sp.nov.and L.yunnanensis sp.nov.,described.Type speci mens are deposited in the Institute of Entomology,Shenyang Normal University.
基金supported by the National Basic Research Program of China (Grant No. 2009CB11860)the National Natural Science Foundation of China (Grant Nos. 31071852 and 30821003)the Special Fund for Agriculture Profession (Grant No. 201103003)
文摘Root growth has a fundamental role in nitrogen （N） use efficiency. Nevertheless, little is known about how modem breeding progress has affected root growth and its responses to N supply. The root and shoot growth of a core set of 11 representative Chinese maize （Zea mays L.） hybrids released between 1973 and 2009 were investigated under high N （4 mmol L^-1, HN） and low N （0.04 mmol L^-1, LN） levels in a solution culture system. Compared with LN, HN treatment decreased root dry weight （RDW）, the root： shoot ratio （R/S）, and the relative growth rate for root dry weight （RGRroot）, but increased the total root length （TRL） and the total lateral root length （LRL）. The total axial root length （ARL） per plant was reduced under HN, mostly in hybrids released before the 1990s. The number of seminal roots （SRN） was largely unaffected by different N levels. More recently released hybrids showed higher relative growth rates in the shoot under both HN and LN. However, the roots only showed increased RGR under HN treatment. Correspondingly, there was a positive linear relationship with the year of hybrid release for TRL, LRL and ARL under HN treatment. Together, these results suggest that while shoot growth of maize has improved, its root growth has only improved under high N conditions over the last 36 years of selective breeding in China. Improving root growth under LN conditions may be necessary to increase the N use efficiency of maize.
