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Search Results: 1 - 10 of 10631 matches for " semi-dwarf and dwarf wheat plants "
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WHEAT CULTIVARS: RESPONSE TO IRRIGATION AND SOWING DATES
Klar, A.E.;Hossokawa, T.;
Scientia Agricola , 1996, DOI: 10.1590/S0103-90161996000200004
Abstract: this study was carried out in an alfisol-oxisol transition sandy-clay texture, using six wheat cultivars (triticum aestivum, l.): two tall and tolerant to soil aluminium toxicity (bh-1146, and iac-18), and four semi-dwarf cultivars - anahuac, iac-162, iac-24, and iac-60 - of which only the first two are sensitive to soil aluminium toxicity. two minimum soil water potentials (ys) levels were used: 1. watered, when ys reached about -0.05 mpa; 2. dry, when the water potential reached around -1.5 mpa. two sowing dates, 05/22/92 and 06/11/92, were used. the results showed that anahuac and iac-60 are the most indicated cultivars for the studied region; when irrigated all cultivars presented similar yield level under no irrigation conditions; the irrigation was not sufficient to avoid yield differences between the two growing seasons; differences in rainfall were important for the crop in the dry treatment for both seasons.
WHEAT CULTIVARS: RESPONSE TO IRRIGATION AND SOWING DATES
Klar A.E.,Hossokawa T.
Scientia Agricola , 1996,
Abstract: This study was carried out in an Alfisol-Oxisol transition sandy-clay texture, using six wheat cultivars (Triticum aestivum, L.): two tall and tolerant to soil aluminium toxicity (BH-1146, and IAC-18), and four semi-dwarf cultivars - Anahuac, IAC-162, IAC-24, and IAC-60 - of which only the first two are sensitive to soil aluminium toxicity. Two minimum soil water potentials (ys) levels were used: 1. watered, when Ys reached about -0.05 MPa; 2. dry, when the water potential reached around -1.5 MPa. Two sowing dates, 05/22/92 and 06/11/92, were used. The results showed that Anahuac and IAC-60 are the most indicated cultivars for the studied region; when irrigated all cultivars presented similar yield level under no irrigation conditions; the irrigation was not sufficient to avoid yield differences between the two growing seasons; differences in rainfall were important for the crop in the dry treatment for both seasons.
Semi-dwarfs in the subspontaneous progeny and the synthesis of red oak dwarf cultivars
?ija?i?-Nikoli? Mirjana,Tucovi? Aleksandar,Viloti? Dragica
Glasnik ?umarskog Fakulteta , 2004, DOI: 10.2298/gsf0490181s
Abstract: The main data on the occurrence of semi-dwarfs in the subspontaneous progeny of American red oak were researched. The grafting of scions from semi-dwarf trees on the stock of related species shortens the juvenile stage, i.e. accelerates the flowering, induces the self-fertilization and potential crossing of related species. The specific undertaking requires to: (1) define the desired type of the dwarf cultivar, (2) develop the model, and (3) plan the genetic nature of the conceived cultivar. The development of cultivars relies on the conceived and long-term activity.
Genetic mapping of a new semi-dwarf gene, sd-t(t), in indica rice and estimating of the physical distance of the mapping region
Guanghuai Jiang,Guohua Liang,Wenxue Zhai,Minghong Gu,Runlong Lu,Jichen Xu,Lihuang Zhu
Science China Life Sciences , 2002, DOI: 10.1360/02yc9043
Abstract: Application and functional study of dwarf and semi-dwarf genes are of great importance to both crop breeding and molecular biology. A new semi-dwarf gene, sd-t(t), non-allelic to sd-1, had been identified in an indica rice variety, Aitaiyin 2. In this study the gene was genetically mapped by using an F2 population, which consisted of 474 individuals developed from a cross between Aitaiyin 2 and B30. The sd-t(t) gene was located between the RFLP markers R514 and R1408B with a distance of 1.1 cM to R514, and 4.5 cM to R1408B on chromosome 4. A physical contig covering the sd-t(t) mapping region was further constructed by screening a BAC library with R514 and R1408B as probes, and the physical distance between R514 and R1408B was estimated at approximately 147 kb. This result will facilitate map-based cloning of the sd-t(t) gene.
Genetic mapping of a new semi-dwarf gene, sd-t(t), in indica rice and estimating of the physical distance of the mapping region
Genetic mapping of a new semi-dwarf gene,sd-t(t),in indica rice and estimating of the physical distance of the mapping region

JIANG Guanghuai,LIANG Guohua ZHAI Wenxue GU Minghong LU Runlong XU Jichen ZHU Lihuang,
江光怀
,梁国华,翟文学,顾铭洪,鲁润龙,徐吉臣,朱立煌

中国科学C辑(英文版) , 2002,
Abstract: Application and functional study of dwarf and semi-dwarf genes are of great importance to both crop breeding and molecular biology. A new semi-dwarf gene, sd-t(t), non-allelic to sd-1, had been identified in an indica rice variety, Aitaiyin 2. In this study the gene was genetically mapped by using an F2 population, which consisted of 474 individuals developed from a cross between Aitaiyin 2 and B30. The sd-t(t) gene was located between the RFLP markers R514 and R1408B with a distance of 1.1 cM to R514, and 4.5 cM to R1408B on chromosome 4. A physical contig covering the sd-t(t) mapping region was further constructed by screening a BAC library with R514 and R1408B as probes, and the physical distance between R514 and R1408B was estimated at approximately 147 kb. This result will facilitate map-based cloning of the sd-t(t) gene.
Identification and Genetic Characterization of a Novel Tillering Dwarf Semi-Sterile Mutant tdr1 in Rice  [PDF]
Bingrui Sun, Tingyou Huang, Chongyun Fu
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.913184
Abstract: Tillering and plant height are important components of plant architecture and grain production in rice. We identified a novel high tillering, dwarf and semi-sterile mutant, as named tdr1 in a rice maintainer line E20 derived from the cross between between IR68888B and Luxiang 90. The investigation of tiller dynamic in the tdr1 line displayed 3 different phases: rapid increasing of tillers in the vegetative growth stage, producing no new tillers in the transition stage from the vegetative growth to reproductive growth, and regeneration of new tillers after heading. The assay of hormones showed the significant reduction of brassinolide level and no change of the levels of gibberellic acid, cytokinin and strigolactone in the tdr1 line. Genetic analysis indicated the phenotype of high tillering, dwarfism and semi-sterility is controlled by a recessive gene in several different segregation populations. The TDR1 gene was mapped in the 105 kb interval between RM3288 and RM6590 on chromosome 4. Cloning of TDR1 gene would provide a new opportunity to uncover the molecular mechanism of the development of plant height and tiller in rice.
Melhoramento do trigo: XX. Herdabilidades e correla??es entre os componentes de produ??o em popula??es híbridas envolvendo fontes de nanismo
Camargo, Carlos Eduardo de Oliveira;
Bragantia , 1989, DOI: 10.1590/S0006-87051989000100005
Abstract: diallelic crosses were made involving the standard height cultivars bh-1146 and atlas-66, the semidwarf cultivar siete cerros and the dwarf source tordo. parents, f1's, f2's and reciprocal backcrosses were tested for grain yield, plant height, number of heads per plant, number of kernels per head, and for weight of 100 kernels, in an experiment carried out at hyslop farm, oregon, u.s.a., in 1978. narrow sense heritability estimates for plant height were moderately high for the crosses bh-1146 x atlas-66 (0.55), bh-1146 x siete cerros (0.60) and atlas-66 x siete cerros (0.74), moderate for the crosses atlas-66 x tordo (0.43) and tordo x siete cerros (0.41) and low for the cross bh-1146 x tordo (0.24). moderate values (0.43 to 0.58) were estimated for number of heads per plant for all crosses with exception of the crosses bh-1146 x atlas-66 and atlas-66 x tordo which presented low values for the narrow sense heritability. the heritability values for weight of 100 grains were low for all crosses with exception of the crosses bh-1146 x atlas-66 and bh-1146 x siete cerros which presented moderate levels (0.40 and 0.45, respectively). in relation to grain yield the narrow sense heritability estimates were low with exception of those for the crosses bh-1146 x tordo (0.73) and bh-1146 x siete cerros (0.62). the phenotypic correlations between grain yield and number of heads per plant, plant height, number of grains per head and weight of 100 grains were positive and mostly highly significant, except for the correlation between grain yield and weight of 100 grains for the population bh-1146 x atlas-66, which was not significant. the results suggested that it would be possible to select semidwarf plants, with high yield potential, with high number of kernels per head and heads per plant, and 100 kernel weight if large segregating populations are used to identify desired genotypes originated from eventual genetic recombinations. this procedure is being used for selections of s
Effects of foliar application herbicides to control semi-parasitic plant Arceuthobium oxycedri
MOHAMMAD REZA KAVOSI,FERIDON FARIDI,GOODARZ HAJIZADEH
Nusantara Bioscience , 2012,
Abstract: Kavosi MR, Faridi F, Hajizadeh G. 2012. Effects of foliar application herbicides to control semi-parasitic plant Arceuthobium oxycedri. Nusantara Bioscience 4: 76-80. Epiphytes are plants growing on the stem and branches of other growing plants. Dwarf mistletoe (Arceuthobium oxycedri) is one of the important macro epiphytes or semi-parasitic plant, is able to damage Junipers and provide favorable conditions for bother damaging factors such as pest, disease, rodent animals and vulnerability to unfavorable climate conditions. In this study used herbicides in three concentrations (1.35, 1.93, 2.7 g of Roundup, 0.675, 0.964, 1.35 g of Basagran, and 0.9, 1.28, 1.8 g of Gramoxone in1000 mL water) and three replications to examine the impact of each herbicide on A. oxycedri at Junipers forests in areas located at the East Gorgan state region, North of Iran. The results from Basagran on 95.55% dwarf mistletoe indicated that the plant was dried completely up. Roundup dried 61.67% of dwarf mistletoe. Gramoxone cause the lowest percent of dryness (23.89%). By analyzing results about the impact of herbicides on percentage of measuring dryness, there is difference in level significant 1% between of herbicides. The impact of each herbicide on A. oxycedri showed that concentration-3 has more impact increasing dwarf mistletoe dryness but with concentration-2 it has less difference. Ultimately concentration-2 Basagran can be used to reduce costs in order control dwarf mistletoe
Spontaneous changes a basis for new ornamental woody plant cultivars
?uki? Matilda,Grbi? Mihailo,Sko?aji? Dragana,?unisijevi? Danijela
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0693071d
Abstract: In nursery stock production of some ornamental woody plants the appearance of spontaneous variability was identified in the form of atypical pigmentation of leaves (albinism, variegated, red colored), leaves shape (jaggy) and dwarfs. Mutated plants with variegated leaves were observed among hybrid plane (Platanus x acerifolia (Ait.) Willd.), Siberian elm (Ulmus pumila L.), laurel cherry (Prunus laurocerasus L.) and Lawson false-cypress (Chamaecyparis lawsoniana (Murr.) Parl.) Seedlings. The type of variegation and frequency were analyzed. Among plane tree and Siberian elm seedlings there were observed red colored leaves. Atypical, jaggy shaped leaves were found among laurel cherry seedlings. Dwarf growth was identified at Siberian elm and birch (Betula pendula Roth.) where also found fruits at one year seedling. There were not significant differences in some morphological and physiological properties in plane tree seedlings with various pigmented leaves. .
dwarf尺寸的进一步缩减
计算机科学 , 2007,
Abstract: dwarf不仅降低了数据立方的存储开销,而且具有结构简单、易于实现、查询和维护等优点,是一种比较理想的数据立方组织方法。为了进一步缩减dwarf的存储尺寸,本文通过研究dwarf结构,分别提出了浓缩dwarf和冰山dwarf:前者从dwarf结构中删除了对于查询来说冗余的内容,而后者从dwarf结构中去掉了对于用户来说琐碎的内容。实验和分析表明,浓缩dwarf有效地减小了dwarf的存储尺寸,而冰山dwarf适合于忽略细节的应用场合,极大地降低了dwarf的存储开销。
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