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1.
BT型粳稻不育系双九A的选育及其利用   总被引:5,自引:2,他引:5  
双九A由安徽省农科院水稻所用80—4A作母本,以优质粳稻品系双九作保持系,经多代回交转育而成的BT型优质粳稻不育系,2002年在海南陵水基地通过安徽省农科院组织的专家鉴定。群体不育株率100%,套袋自交不结实,花酚败育度为99.54%。异交性状佳,花时早,异交结实率50%以上。配合力强,已选配出双优4183、双优3402等优质高产晚粳新组合,应用前景广阔。  相似文献   

2.
g08-1S等起点温度低的温敏核不育系的耐寒基因供体来自江苏紫稻,温敏核不育基因供体来自衡农S-2-6,通过杂交,经多代定向选择,育成了具有耐寒性强,育性转换温度低(22~23℃),开花习性好,制种产量高且地域广,湖南繁殖区主要在海拔700m以上山区,不育系包茎少,经济性状好,配合力强的早熟温敏核不育系。其中g08-1S通过湖南生物研究所人工气候箱模拟1989年最坏天气的盛夏低温处理结实率仍为零。  相似文献   

3.
籼型两用核不育系主要农艺性状的配合力分析   总被引:26,自引:3,他引:26  
 选用5种不同来源的6个籼型两用核不育系与6个早、中籼及广亲和品种以不完全双列杂交方式组配成36个组台,此较分析了6个不育系的株高、穗长、每穗粒数、每穗实粒数、结实率、千粒重、单株穗数、单株产量及生育期9个主要农艺性状的一般配台 和特殊配合力效应以及F1优势表现。 结果表明,不育系之间的一般配台力差异很大,且与所配对应组合的F1竞争优势呈极显著相关,不 育系的一般配合力高,其 所配组合的优势也强。 一般配合力较差的不育系所配组合即使有较高的特殊配合力效应,也难有实际应用价值。3130S和衡农S-1具有较高的一般配合力效应值。作者认为不育系的配合力与其亲缘有关,采用粳籼交或栽野交可能是选育高配合力两用核不育系的有效途径。  相似文献   

4.
两系杂交糯稻选育初报   总被引:11,自引:0,他引:11  
该文报道了利用广亲和基因、糯性基因及色素源基因连锁关系,以紫色稃尖为标记性状,通过杂交、回交等途径,选育出广亲和籼型糯稻不育系和广亲和粳型糯稻恢复系。测交配组表明:结实率在80%以上,丰产性状好。  相似文献   

5.
以粤光S为不育基因供体,与具有广东野生稻亲缘的优质常规稻种质增城丝苗-8选杂交,经多年系谱选择和测交筛选,育成水稻光温敏不育系广3S.该不育系具有不育起点温度较低、开花习性好、异交结实率高、抗寒性强、配合力强、米质较优、综合农艺性状优良等特性,2010年7月通过广东省技术鉴定.以广3S组配的广两优931、广两优802等两系杂交稻新组合在广东省区试中呈现丰、抗、优协调特性,具有广阔的应用前景.  相似文献   

6.
通过6个不育系与绵恢501和明恢63所配12个组合的10个性状的方差分析和恢复系、不育系的一般配合力、特殊配合力的估算及配合力总效应值的比较,绵恢501在株高、结实率、单株穗数和单株粒重4个性状上与明恢63具有相似的配合力,其它几个性状存在着较大的差异。  相似文献   

7.
优质早籼不育系早红突A的选育   总被引:5,自引:1,他引:4  
早红突A是浙江省台州市农科所新育成的一个优质早籼不育系,具有熟期早、配合力好、米质优、异文结实率高等特点,在高产、优质杂文早稻的选育中具有较好的应用前景。  相似文献   

8.
以广占63S为光温敏核不育基因供体,与优质抗病保持系天丰B杂交,F3代选优良核不育单株与天丰B回交,经多年系谱选择和测交筛选,育成水稻光温敏核不育系广越S。该不育系具有不育起点温度较低、柱头外露率高、开花习性较好、异交结实率较高、耐寒性强、稻米品质优、中早熟、配合力强、适应性广和综合农艺性状优良等特性,2014年6月通过广东省技术鉴定。  相似文献   

9.
水稻红莲型不育系粤泰A在杂交稻育种中的利用特性   总被引:3,自引:0,他引:3  
试验初步阐明了水稻红莲型不育系粤泰A在杂交稻育种中具有以下特点:(1)稳定的雄性不育性,在南京1994年和1995年的8月15~30日镜检其花粉可育率均低于1.5%,套袋自交结实率低于0.08%;(2)良好的制种性状,该不育系的柱头外露率达97%,异交结实率61.5%±9.8%,每平方米颖花数达42179个,均极显著地高于珍汕97A;(3)该不育系与中粳广亲和系配组杂种出穗期表现受积温影响较大,而受日长变化影响较小,呈现明显的感温特性。因此,可以预见该类组合在生产上具有较广泛的生态适应性。  相似文献   

10.
为改良温敏核不育系的米质和配合力,用新二S与广茉S杂交,经5 a 9代系谱选择育成了优质籼型温敏核不育系广茉HS。该不育系具有米质好、配合力高、异交习性良好等优点,2014年通过安徽省技术鉴定。利用广茉HS配组选育的优质杂交水稻组合茉两优1501和茉两优1032分别于2017年和2020年通过安徽省农作物品种审定委员会审定。  相似文献   

11.
12.
Summary

The efficiency of N fertilizers is usually poor; often less than 50% of the applied N is taken up by the crop. This review focuses on various N fertilizers with respect to the significance of different N loss pathways, namely (i) ammonia volatilization, (ii) dinitrogen and nitrogen oxide emissions, and (iii) nitrate leaching. Further, the significance of biological N immobilization, ammonium fixation and, finally, the impact of nitrate vs. ammonium uptake on crop yield are also discussed. The reviewed literature shows that N fertilizers may differ markedly in their susceptibility to losses. There is, however, considerable scope to improve N efficiency of each N source by proper N management practices.  相似文献   

13.
Novel food and non-food uses for sorghum and millets   总被引:4,自引:3,他引:4  
Sorghum and millets have considerable potential in foods and beverages. As they are gluten-free they are suitable for coeliacs. Sorghum is also a potentially important source of nutraceuticals such antioxidant phenolics and cholesterol-lowering waxes. Cakes, cookies, pasta, a parboiled rice-like product and snack foods have been successfully produced from sorghum and, in some cases, millets. Wheat-free sorghum or millet bread remains the main challenge. Additives such as native and pre-gelatinised starches, hydrocolloids, fat, egg and rye pentosans improve bread quality. However, specific volumes are lower than those for wheat bread or gluten-free breads based on pure starches, and in many cases, breads tend to stale faster. Lager and stout beers with sorghum are brewed commercially. Sorghum's high-starch gelatinisation temperature and low beta-amylase activity remain problems with regard to complete substitution of barley malt with sorghum malt . The role of the sorghum endosperm matrix protein and cell wall components in limiting extract is a research focus. Brewing with millets is still at an experimental stage. Sorghum could be important for bioethanol and other bio-industrial products. Bioethanol research has focused on improving the economics of the process through cultivar selection, method development for low-quality grain and pre-processing to recover valuable by-products. Potential by-products such as the kafirin prolamin proteins and the pericarp wax have potential as bioplastic films and coatings for foods, primarily due to their hydrophobicity.  相似文献   

14.
Evolutionary aspects of the trade-off between seed size and number in crops   总被引:1,自引:0,他引:1  
Victor O. Sadras   《Field Crops Research》2007,100(2-3):125-138
Whereas the concept that availability of resources drives seed production is sound in principle, it is incomplete as there are many solutions to the allocation of resources that derive from the trade-off between number and size. This paper examines evolutionary aspects of this trade-off in annual grain crops. The analysis is centred on the working hypotheses that, for a given species and environment, allocation of resources to reproduction involves (H1) high plasticity in seed number, which allows for variable resource availability, and (H2) a relatively narrow range of seed size that results from evolutionary and agronomic selection. Comparisons between crops and fish are used to highlight common evolutionary elements in taxa where parents provide little or no care to their offspring, with the consequence that both number and early survival of offspring, hence fitness of parents, are partially related to embryo size and reserves.

The plasticity of seed number in relation to availability of resources is analysed against the established relationship between offspring number and parent growth rate during critical stages. The notion that seed size is under stabilising selection is analysed against three conditions: (1) mean seed size is conservative for a given species and environment, (2) seed size affects fitness, and (3) seed size is heritable. Databases from published papers were compiled to analyse the relative variability of seed size and number, and the heritability of seed size. Evidence for and against the link between seed size and parental fitness is revised using the Smith–Fretwell model as framework (Am. Nat., 108, 499–506).

The proposal of high plasticity of seed number and narrow variability of seed size resulting from stabilising natural selection is generally consistent with evolutionary and genetic considerations. Agronomic selection may have reinforced natural selection leading to relatively narrow seed size in species such as wheat and soybean, where cultivated types retained high plasticity for seed number. In contrast, selection for one or few inflorescences in crops like sunflower and maize may have morphologically reduced seed number plasticity and increased variability of seed size and its responsiveness to resource availability in relation to their wild ancestors.  相似文献   


15.
Flavonoids-enriched tissues of citrus such as peel, immature fruit and flower are consumed as culinary seasonings, tea ingredients in China for centuries. This HPLC quantitative study on the five citrus flavonoids, naringin, hesperidin, neohesperidin, sinensetin and nobiletin on a wide range of Chinese citrus fruits and several Traditional Chinese Medicinal food ingredients in East China, revealed a great diversity in flavonoid composition. Huyou peel (C. paradisi cv. Changshanhuyou) was found to be the best naringin (3.25%) and neohesperidin (2.76%) source; C. aurantium, a major ingredient of several citrus-related TCM, is also a suitable source of naringin and neohesperidin, and a good juice source for flavanone glycosides; the peel of Wenzhoumiju (C. unshiu) is one of the richest local species in hesperidin (up to 6.25%); Zaoju (C. subcompressa) has the highest content of nobiletin (0.59%), a polymethoxylated flavone. LC-ES-MS analysis of Zanthoxylum genus for flavonoids revealed for the first time the presence of significant amounts (0.74%) of hesperidin in the root of Liangmianzhen (Z. nitidum (Roxb.) DC), a relative of Sichuan pepper, which is a spice widely used in China.  相似文献   

16.
Summary The viability of five pathogens was decreased by treatment with hot water when tested in vitro.Polyscytalum pustulans was most sensitive andRhizoctonia solani least sensitive. Potato tubers were exposed to 55°C for 5 min in a commercial continuous hot water treatment plant using naturally contaminated seed tubers and tubers which had been inoculated by dipping in comminuted cultures. The frequency of eyes colonised byP. pustulans, Helminthosporium solani, andR. solani was reduced to virtually zero and the effect persisted on tubers subsequently stored at 4°C and at 15°C for up to 16 wk. Results withColletotrichum coccodes were inconclusive. Treatment suppressedPenicillium spp. which, however, rapidly recolonised the eyes during storage, leading to higher contamination levels in the treated than in the untreated tubers. With tubers inoculated withPhoma foveata, good control was achieved when the incubation period before treatment was 10 d but not when the period was 42 d.  相似文献   

17.
Summary

Heterocyclic 1,4-benzoxazin-3-ones and related benzox-azolinones are important natural products of the cereal crops maize, wheat and rye. Much research has focused on the role of these compounds as defensive agents against plant diseases and pests. Studies of a wide variety of biological effects on herbivores and nematodes, plant pathogenic fungi and bacteria are reviewed in this article. Phytotoxic activity of the compounds is also considered with respect to allelopathic interaction with higher plants. Recent investigations of molecular aspects of interactions of cyclic hydroxamic acids and related benzoxazo-linones with acceptor organisms have demonstrated different effective detoxification strategies and tolerance mechanisms. This research has greatly advanced our knowledge about the multiple roles that these allelochemicals play in ecological systems.  相似文献   

18.
Wheat bran is an undervalued by-product of white flour and has great nutritional potential due to its high content in fibres and bioactive compounds. Micronized bran could be used as a food ingredient to improve the nutritional potential of cereal products, or be used as a starting material for other processes (bioactive compound extraction or bran fractionation). The aim of this work was to find a way to efficiently decrease the particle size of bran. The influence of the grinding temperature (ambient or cryogenic grinding) on the granulometric distribution of particles, their composition, and their microstructure was studied, at lab-scale and pilot-scale. It showed that the intrinsic characteristics of bran (glass transition within intermediate layers at −46 °C) had more influence on its grinding behaviour than the type of grinding device used: the particles size distributions obtained after grinding at lab-scale and pilot-scale were very similar. At both scales, the granulometric curves were narrow for cryogenic grinding, while for ambient grinding they were spread over the whole particle size range. Ultrafine particles were obtained in both ambient and cryogenic conditions. Negative temperatures, by increasing the material’s brittleness, favoured a fast fragmentation of bran: one step of cryogenic grinding allowed a median particle size of nearly 50 μm to be reached, whereas three successive steps of ambient grinding were needed for the same result. On the other hand, ambient temperature favoured the dissociation of the different constituent layers of wheat bran, and produced less composite particles than cryogenic grinding.  相似文献   

19.
The technique of spraying plants with inorganic forms of selenium can be employed for phytochemical production of organic selenium compounds. Fractionation of the plant material makes it possible to produce a highly concentrated and well defined selenium supplement with potential use in animal and human nutrition. The fractionation also gives opportunities to combine production of organic selenium compounds with other products, for example plant fibres. Multiple use of plants can contribute to a more efficient utilization of land area (in comparison to monocultures solely adapted to food production). It also gives the opportunity to develop systems suitable for long term fixation of carbon, as long as the plant material is not reoxidised to carbon dioxide. Plant fibres could provide raw material for the production of paper or building materials in combination with the production of organic selenium compounds preferentially accumulated in another fraction of the processed plant.  相似文献   

20.
Summary Macrosiphum euphorbiae, collected in the field from potato plants infected with potato leafroll virus (PLRV), transmitted the virus to fewer potato plants in a field trial than did laboratory-rearedMyzus persicae. In the laboratory,M. persicae was the only efficient vector of PLRV fromPhysalis floridana seedlings, potato sprouts or excised leaves toP. floridana. Two clones ofM. euphorbiae and one clone ofAulacorthum solani transmitted PLRV from infected potato plants toNicotiana clevelandii as effeciently asM. persicae but a clone ofAphis gossypii was an inefficient PLRV vector. An isolate of PLRV, whichM. persicae transmitted inefficiently from potato toN. clevelandii, was also transmitted inefficiently byM. euphorbiae andA. solani.  相似文献   

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