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烤烟K_(326)成熟期中物质代谢与品质形成关系的研究 总被引：3，自引：2，他引：3
在不同施肥水平、成熟度、留叶数间组织九种组合,按正交法设计沙培与田间试验。烤烟成熟期中测定总氮、烟碱、果糖、蔗糖、水溶性总糖、果胶、淀粉、半纤维素及硝酸还原酶和淀粉酶同工酶的动态,以考查其物质代谢与品质形成的关系,为提高云烟香味选择优化栽培措施．研究表明最佳组合是完熟×施氮8g×留叶18片． 相似文献
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The relation between the critical radius and the particle size distribution for generalized Ostwald type ripening processes whereby the mass transfer coefficient is modelled by a power law was derived. The critical radius is determined by the growth rate, the mass transfer coefficient and the mass balance, and is independent of whether the limiting stationary growth regime has been obtained. 相似文献
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Fruit ripening is a complex process and is regulated by many factors.Ethylene and polygalacturonase (PG),lipoxygenase (LOX),expansin (EXP) are all critical regulating factors in fruit ripening and softening process.With antisense,ACS tomato,Nr mutant tomato and cultivated tomato as materials,Northern blot hybridization showed that PG,LeEXP1 and LOX expressed differently in different parts of cultivated tomato fruit during ripening,which was related to fruit ripening.The ripening process of columella and radial pericarp was faster than pericarp.In both Nr mutant and antisense ACS transgenic tomato fruit,expression levels of PG,LeEXP1 and LOX were generally lower than those in cultivated fruit but still related to fruit ripening.The expression levels of PG,LeEXP1 and LOX increased in the mature green tomato fruits after 0.5 h treatment with ethylene ( 100 μL/L).These results indicate that gene expression of PG,LeEXP1 and LOXwere positively regulated by ethylene.The time and cumulative effect of the concentration exists in the expression of PG regulated by ethylene.The regulation of LOX expression mainly depended on the fruit development after great amount of ethylene was produced.PG played a major role in ripening and softening of tomato fruit,and cooperated with the regulation of EXP and LOX. 相似文献
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猕猴桃果实采后呼吸作用的研究 总被引：1，自引：0，他引：1
本试验以中华猕猴桃通山5号、武植3号和美味猕猴桃海沃德果实为试材,探讨了猕猴桃果实采后呼吸作用的变化。结果表明:通山5号、武植3号和海沃德果实采后都有明显的呼吸高峰,且不同品种、不同成熟度的果实呼吸强度有明显差异,呼吸高峰出现时期亦不同。采收时果实成熟度越高,呼吸强度越大,呼吸高峰亦越早。以研究结果看,猕猴桃属明显呼吸跃变果实。 相似文献
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不同涂蜡处理对杨桃果实采后贮藏性能的影响 总被引：2，自引：0，他引：2
乔方 《深圳职业技术学院学报》2004,3(4):16-18
研究了相对湿度93％，5℃条件下杨桃果实经不同来源果蜡处理后采后成熟特性和肉质变化。结果表明：所选果蜡对杨桃采后贮藏品质，如果皮颜色、果实呼吸强度、果实失重率．果实可溶性固形物含量，均有不同程度的促进，其中纳米保鲜果蜡在延迟杨桃采后黄化．降低失重率等方面均优于其他果蜡。 相似文献
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INTRODUCTION A polydisperse precipitate produced by nuclea-tion in a metastable supersaturated solution is far from thermodynamic equilibrium, i.e. a state of minimal free energy. A decrease of free energy is accom-plished by a coarsening of the precipitate which es-sentially reduces the surface free energy with respect to the surrounding solution. The process is called Ostwald ripening and is a direct consequence of the Kelvin effect (Adamson and Gast, 1997), that is the higher solubi… 相似文献
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Characteristics of fruit ripening in tomato mutant epi 总被引：1，自引：0，他引：1
INTRODUCTION As a gaseous phytohormone, ethylene plays an important role in plant growth and development. Eth-ylene can alter plant physiology and morphology due to its effect of regulating gene expression (Moc-tezuma et al., 2003). Such regulation apparently de-pends on the effect of the normal ability of the plant tissues on ethylene perception and signal transduction.Impairment of the perception and signal transduction pathway(s) would thus ultimately lead to alterations in the plant… 相似文献
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研究了烤烟种子在成熟过程中硝酸还原酶（NR）、多酚氧化酶（PPO）、过氧化物酶（POD）同工酶活性的变化。结果表明：NR、PPO、POD参与了烤烟种子的成熟过程,并调控有关代谢与生化反应。不同品种与成熟时期,各种酶活性变化有差异,但总的变化趋势则基本一致。NR活性以红花大金元最高,K326次之,G－28最低。PPO活性褐熟期前K326高,G－28次之,以红花大金元活性最低。POD同工酶谱带以红花大金元消减速率最快,但各品种都种子成熟而谱带减少,最后趋于消失。 相似文献
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