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Comparisons were made of three different 15N-feeding techniques, leaf, petiole and stem feeding, to identify the most efficient technique for labelling above-and below-ground plant biomass under controlled environment conditions. 15N-urea (0.5%, 10 atom % excess 15N) was applied to chickpea (Cicer aritenium var. ICCV 5003) plants twice during early growth. Leaf feeding was found to be the most efficient in terms of 15N-solution uptake (5.9 ml 48 h−1) and 15N-enrichment at harvest, with 0.95, 0.41, 0.79, 0.67 and 0.22 atom % excess 15N in the leaves, stems, grain, grain straw and clean root fractions, respectively. Solution uptake was low in the second stem feeding event due to blockage of the drilled hole, resulting in low 15N-enrichment of leaves (0.29 atom % excess 15N). Although petiole feeding resulted in more even relative enrichments among plant parts our results highlight the usefulness of leaf 15N-feeding to estimate below-ground plant N and to trace the long-term fate of plant-derived N within the soil. 相似文献
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The nitrate, chloride and sulphate content and their interaction effects in capsicum and tomato plants growing in glasshouse under fertigation systems was studied. Using leaf petiolesap concentrations as an index of the uptake rhythm, it was found that nitrate‐chloride and nitrate‐chloride plus sulphate relationships are regulated by potential or logarithmical laws. Nitrate‐sulphate interactions only appear clear in capsicum plants, but not for tomato.
The utilization of these interaction curves may permit the use of waters with a relatively high saline level for the irrigation of the both capsicum and tomato plants, by suitable planning of the nitrate supply in the fertigation program. 相似文献
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草莓叶柄托叶外植体快速繁殖的研究 总被引:1,自引:0,他引:1
为提高脱毒草莓试管种质材料的利用率,提高脱毒草莓试管苗的继代增殖倍数,缩短生产周期,降低脱毒草莓试管苗的成本,在草莓试管苗继代培养时进行了单个叶柄托叶接种培养试验。在"MS+6-BA 1.0 mg.L-1~2.0 mg.L-1+IBA0.2 mg.L-1"培养基上不经过愈伤组织阶段,直接从叶柄基部的托叶部位再生了试管植株,植株再生率达100%,最高再生试管苗数达12.5株.托叶-1;将单叶柄托叶接种培养法应用于脱毒草莓的继代快繁,草莓试管苗的最高增殖倍数达传统方式的9倍;利用单叶柄托叶接种法继代繁殖草莓脱毒苗可大幅度提高草莓试管苗的继代增殖倍数,缩短生产周期,降低成本。 相似文献
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氮素形态对抗大白菜小黑点病品种生理代谢的影响 总被引:1,自引:0,他引:1
以抗病品种鲁白15、M36为材料,研究了收获期大白菜在不同氮素形态下与抗病性相关的生理指标的变化。试验结果表明,鲁白15对氮素形态比较敏感,M36对氮素形态不敏感;且两品种在铵态氮肥和硝态氮肥处理下较有规律性,酰胺态氮处理中间稍有波动。在铵态氮处理条件下,鲁白15叶柄中SOD、POD、PPO活性及MDA、酚类物质含量均高于硝态氮处理;叶片中MDA含量、POD、PPO活性与叶柄中的趋势一致,而SOD活性、酚类物质含量则与叶柄中的相反。对于M36而言,硝态氮处理的叶片中SOD、POD、PPO活性以及MDA、酚类物质含量均高于铵态氮处理,叶柄中SOD、POD活性、酚类物质含量与叶片中的趋势一致,而MDA含量、PPO活性则与之相反。综合来看,不论在何种氮素形态下,鲁白15和M36叶片中SOD、POD、PPO活性及MDA、酚类物质含量都高于叶柄中。 相似文献