共查询到20条相似文献,搜索用时 187 毫秒
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2011~2012年在湖南怀化利用岩洞冷水灌溉,对水稻温敏核不育系安农810S、云峰S进行一季加多次再生连繁试验。2年平均产量:安农810S头季繁殖为4906.7 kg/hm2、再生繁殖为5131.7 kg/hm2;云峰S头季繁殖为5790 kg/hm2、再生繁殖为6167.5 kg/hm2;种子质量合格。连繁方法简化了水稻温敏核不育系繁殖程序,降低了劳动用工成本和物质消耗,提高了原种的繁殖系数,是高产、优质、低耗、高效的水稻栽培技术。 相似文献
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温敏核不育基因在籼型三系遗传背景下的育性表达 总被引:3,自引:1,他引:2
用3个温敏核不育系培矮64S、6311S和360S与7个籼型质核互作型水稻雄性不育系及相应的保持系、3个恢复系配组,观察了51个组合的F1、19个F2及6个BC1的育性表现。结果表明:培矮64S温敏核不育性状由2对隐性基因控制,具有对质核互作型雄性不育系育性的强恢复基因;6311S温敏核不育性状由1对隐性基因控制,同时具有1对弱恢复基因;360S温敏核不育性状由1对隐性基因控制,但没有恢复基因。进一步利用4个细胞质雄性不育系/6311S组合F2群体中4个温敏核不育株与5个细胞质雄性不育系CMS配组,研究了杂交F1的育性,表明在可育细胞质背景下,三系恢复基因对温敏核不育基因的表达没有影响;在不育细胞质背景下,三系恢复基因是温敏核不育基因表达的关键。由此提出了选育不育细胞质背景的光温敏核不育系和温敏核不育背景的质核互作型不育系的策略。 相似文献
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《杂交水稻》2016,(5):65-69
以来源于不同地域的8个水稻品种为细胞质供体,以温敏核不育系株1S、准S作为细胞核供体,分别连续回交12次,得到株1S和准S 2套核背景的同核异质温敏核不育系,比较了新质源不育系与其对照不育系的光合特性。结果表明,在株1S同核异质不育系中,以日本晴为细胞质源的不育系株1-5S的Pn、Fv'/Fm'、Phi PS2和q P均显著大于对照株1S,而以V20A为细胞质源的不育系株1-3S则显著小于对照株1S;在准S同核异质不育系中,以茶陵野生稻为细胞质源的不育系准-8S的Pn、Fv'/Fm'、Phi PS2和q P均显著大于对照准S,而以Lemont为细胞质源的不育系准-7S的Pn、Fv'/Fm'、Phi PS2和q P及以V20A为细胞质源的不育系准-3S的Pn则显著小于对照准S。V20A细胞质对不育系的光合效率有负效应,茶陵野生稻细胞质和日本晴细胞质在特定的质核互作中有明显的正效应。 相似文献
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《Plant Production Science》2013,16(2):189-198
AbstractGrain number per spike of wheat is lower in early sowing than in the conventional standard cultivation in Yamaguchi, Prefecture, Japan. Components of the grain number per spike in five cultivars were analyzed with respect to temperature during the spike development period throughout three growing seasons 2001/2002, 2002/2003 and 2003/2004 to find the cause of the problem of early sowing cultivation. The plants sown in early-October and late-November were called the early sown group and the standard group, respectively, in the following. Three of the five cultivars, Hokushin, Akitakko and Nanbukomugi, showed a strong winter habit, which requires very cold temperatures for spike differentiation. The other two cultivars, Iwainodaichi and Airakomugi, had a moderate winter habit. Grain number per spike and grain yield were decreased by early-sowing (compare with the standard group) in almost all cultivars throughout the three growing seasons. The three cultivars which had a strong winter habit had fewer spikelets per spike in the early-sown group than in the standard group. The other two cultivars which had a moderate winter habit had fewer grains per spikelet in the early-sown group. The higher the temperature during the spikelet formation phase, which is from flag leaf initiation to terminal spikelet initiation, the higher the number of spikelets per spike in the standard group. The spikelet number per spike in the early-sown group increased with the increase in productive tillers under fertile conditions. Such conditions also increased the grain number per spike. 相似文献
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《Journal of Crop Improvement》2013,27(2):415-432
Summary This paper reviews the effects of allelopathic interactions in agroecosystems in Spain on plant physiological activity and their ecological advantages. The phenological stage of growth of donor plants and the effective allelochemicals in the soil solution while studying the role of phenolic compounds were highlighting. Finally possible future prospects and conclusions regarding weed control by allelochemi-cals under integrated crop management strategies are discussed. 相似文献
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以翔实的资料对2009年中国稻米生产、消费、进出口、供求平衡、库存、价格走势、购销政策和国际稻米供求等情况进行了全面地分析,对影响2010年稻米市场价格走势的各种因素进行了深入研究,并在此基础上对2010年我国稻米市场价格走势进行了预测,结论是我国稻米价格仍呈上行趋势。 相似文献
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Summary Diurnal changes in net photosynthetic rate were measured in a furrow-irrigated potato crop and in a riverbed crop where the
water table was always maintained at 20–28 cm from the soil surface. In the irrigated crop, the photosynthetic rate during
mid-afternoon was about half the peak rate observed at noon. This reduction was accompanied by a near tripling of stomatal
resistance, a 45% reduction in transpiration, and a 5-fold increase in the difference between leaf and air temperatures. No
such changes were observed in the riverbed crop where the photosynthetic rate remained nearly constant at about 0.9 mg m−2 s−1 between 9 a.m. and 4 p.m. Tuber yield in the riverbed crop was about 30% higher than in the irrigated crop. 相似文献
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Corné Kempenaar Thomas Been Johan Booij Frits van Evert Jean-Marie Michielsen Corné Kocks 《Potato Research》2017,60(3-4):295-305
Precision agriculture is a farming management concept based on observing, measuring and responding to inter- and intra-field variability in crops. In this paper, we focus on responding to intra-field variability in potato crops and analyse variable rate applications (VRAs). We made an overview of potential VRAs in potato crop management in The Netherlands. We identified 13 potential VRAs in potato, ranging from soil tillage to planting to crop care to selective harvest. We ranked them on availability of ‘proof of concept’ and on-farm test results. For five VRAs, we found test results allowing to make a cost-benefit assessment. These five VRAs were as follows: planting, soil herbicide weed control, N side dress, late blight control and haulm killing. They use one of two types of spatial data: soil maps or biomass index maps. Data on costs and savings of the VRAs showed that the investments in VRAs will pay off under practical conditions in The Netherlands. Savings on pesticide use and N-fertilizer use with the VRAs were on average about 25%, which benefits the environment too. We foresee a slow but gradual adoption of VRAs in potato production. More VRAs will become available given ongoing R&D. The perspectives of VRAs in potatoes are discussed. 相似文献
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体细胞无性系变异是一种重要的细胞工程育种技术,其应用于棉花育种的前提是建立高效的组织培养诱导再生植株体系.本文简要综述了棉花离体诱导植株再生研究的现状,重点讨论了棉花体细胞无性系变异的表现、利用方法及机理,提出了当前研究存在的问题并对今后的研究进行了展望. 相似文献