共查询到20条相似文献，搜索用时 247 毫秒
1.
A. F. Al‐Jamali M. A. Turk A. R. M. Tawaha 《Journal of Agronomy and Crop Science》2002,188(4):254-259
To determine the effects of ethephon [(2‐chloroethyl) phosphonic acid] on yield and yield components of rainfed barley in arid (150 mm rainfall) and semiarid (346 mm) regions, the present study was conducted during the growing seasons of 1999–2001. Ethephon was applied at the tillering, stem elongation and flowering stages. Acomparison of the effect of ethephon on rainfed and irrigated barley performed at the semiarid location in the following season confirmed the results. Ethephon decreased grain yield when sprayed at tillering and stem elongation compared with the later flowering stage for both the arid and semiarid locations. All arid‐location barley plants had lower grain yields than the semiarid‐location plants. There was a reduction in spikes m?2 in the tillering and stem elongation stage sprayings compared to the control for both locations. In the semiarid and arid locations no difference in earliness (50 % heading) was observed between spraying times but ethephon always delayed heading. All arid‐location plants were earlier than semiarid‐location plants. However, when ethephon was used with supplementary irrigation it was found to increase grain yield, spikes m?2 and earliness. 相似文献
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Chinese urban migrants' sense of place: Emotional attachment,identity formation,and place dependence in the city and community of Guangzhou 总被引：2，自引：0，他引：2
In this paper, we study urban migrants' sense of place in Guangzhou, China, focusing on the structural relations between place attachment, identification and dependence as the three key place dimensions. Through both quantitative structural equation modelling and qualitative analysis of in‐depth interviews data, our research suggests that migrants' sense of place demonstrates complex relationships between the three registers of emotional attachment, identity formation and functional dependence. The construction of sense of place is also related to the personal experiences of living as urban ‘outsiders’. Our research also reveals a striking difference between the city and community levels in terms of the ways in which migrants' sense of place is constructed. Urban migrants tend to exploit the functional utilities of microscopic urban spaces to meet their demands for recreation, education and socialisation. On the other hand, their sense of place to the city is largely compromised by their attachment to the hometown and conditioned by their personal identification to the city. 相似文献
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Abstract: Research on the economic performance of small states has concentrated on the implications of small size and thin local markets. An interesting feature of many of the world's smallest states, of which the Pacific region has many, is that they face additional challenges than just small size. Many are remote from global markets for their products. In addition, a large number are also islands, many of which are also mountainous. Many of the smaller states are not just islands, but are also archipelagos. Hence in addition to small size, many of the world's small states also exhibit four other characteristics that may affect their economic performance: insularity, remoteness, being archipelagos and being highly mountainous entities. This paper examines the nature of the challenges posed by these four characteristics and seeks to produce empirical evidence of how difficult it has been to overcome these challenges. The paper draws on empirical evidence for 126 very small global states, dependent territories and highly autonomous regions. The paper then turns to the position of the Pacific small states and dependent territories. 相似文献
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Takuya Wada Hiyori Monden Sachiko Isobe Kenta Shirasawa Takayuki Sueyoshi Chiharu Hirata Miyuki Mori Shiro Nagamatsu Yoshiki Tanaka 《Breeding Science》2021,71(4):456
Male sterility is one of the reproductive isolation systems in plants and quite useful for F1 seed production. We previously identified three independent quantitative trait loci (QTLs) for male sterility of cultivated strawberry, Here, we identified the specific subgenomes in which these QTLs are located by QTL-seq approach. QTLs qMS4.1, qMS4.2, and qMS4.3 were mapped separately in subgenomes Fvb4-4, Fvb4-3, and Fvb4-1, respectively, in ‘Camarosa’ genome assembly v. 1.0.a1. Candidate regions of qMS4.1 and qMS4.3 were clearly detected around 12–26 Mb in Fvb4-4 and 12–14 Mb in Fvb4-1, respectively; those of qMS4.2 were fragmented in Fvb4-3, which suggests that some scaffolds were incorrectly assembled in Fvb4-3. qMS4.3 was mapped to chr4X1 of ‘Reikou’ genome assembly r2.3, and qMS4.1 and qMS4.2 were both mapped to chr4Av, which indicates that differentiation of the subgenomes in which both QTLs are located was insufficient in ‘Reikou’ r2.3. Although ‘Camarosa’ genome assembly v. 1.0.a1 is an unphased map, which merges homologous chromosomes into one sequence, ‘Reikou’ genome assembly r2.3 is a phased map, which separates homologous chromosomes. QTL mapping to different reference genomes clearly showed the specific features of each reference genome, and that using different kinds of reference map could accelerate fine mapping and map-based cloning of certain genes of cultivated strawberry. 相似文献
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Abstract: Drawing on field work in Southern Thailand undertaken in July 2005, the study illuminates the complex and contingent way in which the Indian Ocean tsunami of December 2004 affected communities, households and individuals. The paper problematises the indiscriminate/discriminate patterning of impact and recovery and also makes a case for a delocalised and transnational approach to understanding the impacts of the wave. Using the notion of ‘tsunami footprints’ and drawing on qualitative interviews, the paper proposes that impacts need to be seen in the context of the spatially dispersed networks of association that characterise the Thai space economy and Thai society. Drawing on work on poverty dynamics, the paper also explores three explanatory disjunctures in recovery transitions: the disjuncture between the pre‐tsunami context and the post‐tsunami situation; the disjuncture between structure and agency; and the disjuncture between the appearance of progressive and gradual change in societies and the lived reality of turbulence. 相似文献
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Edward P. Wilhelm Margaret I. Boulton Tobias E. S. Barber Andy J. Greenland Wayne Powell 《Plant Breeding》2013,132(6):539-545
In wheat, semidwarfism resulting from reduced height (Rht)‐B1b and Rht‐D1b was integral to the ‘green revolution’. The principal donors of these alleles are ‘Norin 10’, ‘Seu Seun 27’ and ‘Suwon 92’ that, according to historical records, inherited semidwarfism from the Japanese landrace ‘Daruma’. The objective of this study was to examine the origins of Rht‐B1b and Rht‐D1b by growing multiple seed bank sources of cultivars comprising the historical pedigrees of the principal donor lines and scoring Rht‐1 genotype and plant height. This revealed that ‘Norin 10’ and ‘Suwon 92’ sources contained Rht‐B1b and Rht‐D1b, but the ‘Seu Seun 27’ source did not contain a semidwarf allele. Neither Rht‐B1b nor Rht‐D1b could be definitively traced back to ‘Daruma’, and both ‘Daruma’ sources contained only Rht‐B1b. However, ‘Daruma’ remains the most likely donor of Rht‐B1b and Rht‐D1b. We suggest that the disparity between historical pedigrees and Rht‐1 genotypes occurs because the genetic make‐up of seed bank sources differs from that of the cultivars actually used in the pedigrees. Some evidence also suggests that an alternative Rht‐D1b donor may exist. 相似文献
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Koukham Vilayheuang Ryoko Machida-Hirano Chay Bounphanousay Kazuo N. Watanabe 《Breeding Science》2016,66(2):204-212
Rice (Oryza sativa L.) is the main food for people in Laos, where it has been grown and eaten since prehistory. Diverse landraces are grown in Laos. ‘Khao Kai Noi’, a landrace favored for its eating quality, is held in the nationwide collection of traditional landraces in the Lao national genebank. Genetic diversity is crucial for sustainable use of genetic resources and conservation. To investigate the genetic diversity of ‘Khao Kai Noi’ for conservation, we genotyped 70 accessions by using 23 polymorphic simple sequence repeat markers. The markers generated 2 to 17 alleles (132 in total), with an average of 5.7 per locus. The total expected heterozygosity over all ‘Khao Kai Noi’ accessions was 0.271. Genetic variation was largest among accessions and smallest within accessions. Khao Kai Noi accessions were classified into three different genetic backgrounds, but there was unclear association between the three inferred population and name subgroups and geographical distribution. Most of the accessions were clustered with temperate japonica and showed genetic relatedness to rice from neighboring provinces of Vietnam, suggesting a Vietnamese origin. The results of this study will contribute to the conservation, core collection and future breeding of the Khao Kai Noi population. 相似文献
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Michael Hill 《Asia Pacific viewpoint》2000,41(2):177-190
It is possible to demonstrate, using Singapore as a key example, the way in which the attribution of a set of ‘Asian values’ represented a Western project which is best labelled ‘reverse Orientalism’. This process entailed the attribution of a set of cultural values to East and Southeast Asian societies by Western social scientists in order to contrast the recent dynamic progress of Asian development with the stagnation and social disorganisation of contemporary Western economies and societies. The contrast provided legitimation for some of the nation‐building policies of political leaders in such countries as Singapore and was incorporated in attempts to identify and institutionalise core values. 相似文献
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Abstract: The border studies literature makes a strong case against claims for unfettered transnationalism and ‘borderlessness’ in our ‘globalising world’. However, its focus on movement across borders means that it fails to address bordering practices that occur within the nation‐state as a result of transnational activity. In this paper, we extend Cunningham and Heyman’s concepts ‘enclosure’ and ‘mobility’ to confront the different layers of bordering (both physical and non‐physical) that have occurred in Indonesia’s Riau Islands since they became part of the Indonesia–Malaysia–Singapore Growth Triangle. 相似文献
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L. Dondini L. Pierantoni V. Ancarani M. D’Angelo K.‐H. Cho I.‐S. Shin S. Musacchi S.‐J. Kang S. Sansavini 《Plant Breeding》2008,127(5):524-526
The inheritance of the red colour character in European pear (Pyrus communis L.) was studied over 3 years in seven progeny obtained by using the cultivars ‘Max Red Bartlett’, ‘Cascade’ and ‘California’ as red‐skinned fruit parental lines. One of these progeny (derived from the cross ‘Abbé Fétel’ × ‘Max Red Bartlett’, a red mutation of ‘Bartlett’) was already used to construct two linkage maps and, being ‘red colour’ a monogenic dominant trait, it was possible to locate it as morphological marker in the linkage group 4 of ‘Max Red Bartlett’. For the first time, this trait has been mapped out of linkage group 9 in a species belonging to the Maloideae subfamily moreover in a mutated sport. An improved knowledge of the genetic basis of production and accumulation of red pigments in the fruit skin will better support the pear breeding programmes aimed to select new cultivars carrying this appealing trait. 相似文献
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This paper investigates the relationship between regional and national identities in the age of globalisation, with particular reference to the Association of Southeast Asian Nations (ASEAN). For members of ASEAN, economic integration is seen as a necessary step forward in order to (i) reduce reliance on Western countries during times of economic crisis and (ii) speed up the recovery process in the aftermath of a crisis. The concept of an ASEAN Economic Community represents a step towards achieving this goal. However, by means of a case study, this paper demonstrates that the idea of an ASEAN Economic Community does not yet have sufficiently solid foundations. Cracks appear when member states act in response to national interest. Given the frequency of friction between member nations, and the fact that ASEAN members are quite diverse in both economic and cultural respects, there is still much more to be done to realise the objective of forming an effective and credible regional economic group. In this paper some suggestions are offered that might assist with the achievement of this goal. 相似文献
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Tullio Venditti Antonio Dore Maria Giovanna Molinu Mario Agabbio Guy D&#x;hallewin 《Postharvest Biology and Technology》2009,54(2):111-114
In recent years several alternatives to the chemical control of postharvest decay have been examined but satisfactory levels of control, with a single system, have not been achieved yet. In the present study the results of an integrated postharvest approach are reported. Early and late harvested hybrid mandarin fruit “Fremont” and “Fairchild”, inoculated with Penicillium digitatum (Pers.:Fr.) Saccardo, were cured at 36 °C for 36 h with 95% RH and then fumigated with 0, 5, 15, 25, 50, 75 and 100 μL/L of acetic acid (AAC) vapours for 15 min. Following the treatments, fruit was stored at 20 °C and 80% RH to simulate a marketing period, and after 2 weeks the decay incidence and the visual appearance were evaluated. Curing or fumigations performed alone reduced decay with respect to untreated fruit, but the best control was achieved with combined treatments. For early harvested fruit the lowest decay percentage was obtained by using 75 μL/L with 8.3% and 2.1% of rots for “Fremont” and “Fairchild”, respectively, whereas for late harvested fruit the highest efficacy was observed using 50 μL/L (1.4% and 6.6%). Rind damage as pitting was observed only if fruit was treated with AAC alone at 100 μL/L. 相似文献
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Richard Willis 《Asia Pacific viewpoint》2001,42(1):55-65
The continuation of the deregulated and restructured environment of the 1980s has produced differential impacts across different farming types and therefore varying results in different rural regions. There has been a major land use change away from traditional sheep farming to dairying on the flats and forestry on the steeper hills. Net farm profit during the 1990s has increased by 180 per cent on dairy farms but by only 97 per cent on sheep and beef farms. In one sense agriculture in New Zealand has become more ‘post‐productivist’ with a reduction in government support, a dramatic reduction in the number of farms, and an increase in farmland converted to urban and recreational uses such as farm tourism and golf course capitalism. But on the other hand New Zealand farmers still remain family rather than corporate, and they are firmly committed to increased production. Other challenges include pressure to deregulate the co‐operative and producer board system, and genetically modified food. 相似文献
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Carotenoids are not only important to the plants themselves but also are beneficial to human health. Since citrus fruit is a good source of carotenoids for the human diet, it is important to study carotenoid profiles and the accumulation mechanism in citrus fruit. Thus, in the present paper, we describe the diversity in the carotenoid profiles of fruit among citrus genotypes. In regard to carotenoids, such as β-cryptoxanthin, violaxanthin, lycopene, and β-citraurin, the relationship between the carotenoid profile and the expression of carotenoid-biosynthetic genes is discussed. Finally, recent results of quantitative trait locus (QTL) analyses of carotenoid contents and expression levels of carotenoid-biosynthetic genes in citrus fruit are shown. 相似文献