共查询到19条相似文献，搜索用时 218 毫秒
1.
以郁金香品种“Apeldoorn”鳞茎为试材,以栗钙土、草炭、河沙为栽培基质,研究了6种不同配比的栽培基质对郁金香新鳞茎周径、干重、含水量及还原糖含量的影响.结果表明:在郁金香新鳞茎生长发育过程中,干重和周径表现为缓-快-缓的变化趋势；齐苗后前4周含水量缓慢上升,之后逐渐下降,以50％栗钙土+30％草炭+20％河沙下降幅度最大,达到14.9％,以河沙下降幅度最小,为11.6％；齐苗后前6周还原糖含量变化缓慢,6～8周急剧增加,在齐苗后第8周出现1个峰值,之后又迅速下降,其中以50％栗钙土+30％草炭+20％河沙下降幅度最小,为2.53 mg/g FW. 相似文献
2.
3.
4.
东方百合鳞茎长期冷藏期间形态和生理变化研究 总被引：5，自引：0，他引：5
以浙江省山地自繁的东方百合鳞茎'索蚌'(Sorbonne)为试材,探讨了5℃冷藏条件下鳞茎的芽伸长变化,以及贮藏性和代谢性养分的变化规律.结果表明:百合鳞茎内的新芽在冷藏过程中不断伸长,60 d后顶芽生长点距鳞茎端部的距离小于1 cm,继续冷藏1个月后新芽突破顶端.在贮藏的前2个月,淀粉含量明显下降,外层鳞片是3层中下降幅度最大的,后2个月淀粉含量趋于缓慢上升.可溶性总糖和蔗糖含量在贮藏的5个月时间里,均呈不断上升的趋势.中层鳞片的可溶性总糖含量增幅最大,达到了196.11%. 相似文献
5.
以“兰州软儿梨”为试材,采用单因素试验方法,研究了不同后熟温度条件对“兰州软儿梨”后熟过程中果实呼吸强度、乙烯释放量、质构及色差的影响,以期探明“兰州软儿梨”的后熟规律,并为其后熟过程的调控提供参考依据。结果表明：低温处理能延缓“兰州软儿梨”的后熟进程,而随着后熟温度增加,“兰州软儿梨”后熟进程加快。16℃处理下,“兰州软儿梨”果实的呼吸高峰出现在后熟第20天,而19、22、25℃处理下果实的呼吸高峰均出现在第12天;不同温度处理果实乙烯释放高峰期均为第12天,且随着后熟温度提高,果实乙烯释放量依次增加;不同后熟温度处理对“兰州软儿梨”果实质构有显著影响,果实硬度呈现“先迅速下降,后缓慢下降”的变化,且后熟温度越高,硬度下降越快;果实肉质的胶着性、咀嚼性变化呈现为16、19℃处理下缓慢下降,22、25℃处理下先迅速下降后缓慢下降;后熟处理温度对“兰州软儿梨”果皮色差影响明显。 相似文献
6.
冀西北坝上地区不同播期对卷丹百合农艺性状的影响 总被引：1，自引：0，他引：1
为了找出冀西北坝上地区栽种卷丹百合的最佳播期,进行了不同播期对百合生育期和农艺性状影响的研究,结果表明,在冀西北坝上地区栽种卷丹百合,随着播期的推迟,百合的株高和地径逐渐缩短。百合开花后鳞茎数已基本不再增加,而鳞茎周径和鲜质量迅速增长。因此要获高产、优质的卷丹百合,其播期最迟为5月11日,在温度稳定通过5℃以后,越早越好。 相似文献
7.
8.
采后豌豆在贮藏期间失水严重,硬度迅速下降;呼吸速率缓慢上升,呼吸高峰出现在第4d;果肉细胞膜透性在采后初期变化缓慢,后期急剧上升;豆荚叶绿素、有机酸、蛋白质和维生素C的含量一直呈下降趋势,而豆荚可溶性固形物的含量则先升后降,室温贮藏8d后豌豆的商业品质迅速下降. 相似文献
9.
百合低温贮藏和花芽分化过程中鳞片细胞淀粉粒的显微观察 总被引：1，自引：0，他引：1
以新铁炮百合‘雷山’（Lilium formolongi‘Raizan’）鳞茎中部鳞片为试材,利用石蜡切片和扫描电子显微技术,观察了鳞茎低温贮藏和花芽分化过程中细胞内淀粉粒的数量和结构。结果表明：刚收获的百合鳞茎,中部鳞片薄壁细胞内可见大量淀粉粒充满整个细胞腔。在低温解除过程中,鳞片细胞的淀粉粒数量明显减少;在栽植后的花芽分化进程中,鳞片中的淀粉粒数量又呈逐渐增加的趋势。淀粉粒主要为椭圆形和长卵形,轮纹清晰,外围由一层半透明膜包裹。 相似文献
10.
施肥对三种切花百合钾素吸收动态的影响 总被引：1，自引：0，他引：1
通过盆栽土培试验方法,研究了施肥与不施肥(对照)条件下东方百合、麝香百合和亚洲百合3个切花百合品种的钾素吸收规律.结果表明:随着生育期进展,各品种的切花百合地上部各器官含钾量均逐渐降低,地下部器官根和鳞茎则依品种和施肥的不同而表现出差异.鳞茎中的钾素支撑切花百合的前期地上部生长的钾素需求,经历的时间3个品种基本一致,均为47 d.钾素快速吸收期品种之间存在差异,东方百合由花芽分化至切花,历时81 d;麝香百合由花芽分化至切花,历时50 d;由亚洲百合10月6日至切花,历时25 d.施肥均提高了3个品种后期整株的钾积累量,但出现时期因品种而不同,东方百合最早、麝香百合次之、亚洲百合最迟. 相似文献
11.
N. T. Welander O. Hellgren 《The Journal of Horticultural Science and Biotechnology》2013,88(2):279-286
SummaryNet photosynthesis, dark respiration and chlorophyll content were studied in plants of Codiaeum when transferred” from a glasshouse to photon flux densities 6, 18, or 66 μE m?2s?1 in growth rooms. The diurnal patterns of daily net photosynthesis and dark respiration were recorded during the first 12 days and 3, 7, 11 and 19 weeks after the transfer. Only plants transferred to 66 μE m?2s?1 reached a positive total net photosynthesis per day within the first 12 days. This was achieved only between the 12th day and 3 weeks when transferred to 6 μE m?2s?1. The rate of net photosynthesis increased until the 11th week and then declined, while dark respiration decreased until the 11th week and then increased. The diurnal patterns of net photosynthesis and dark respiration changed significantly with time of acclimatization. The rate of change in daily net photosynthesis and dark respiration was highest in the plants transferred to the lowest photon flux density. Changes in chlorophyll content of the leaves were similar to those in net photosynthesis. 相似文献
12.
Asiatic hybrid lilies, Lilium × elegans Thunb., ‘Red Carpet’ and ‘Sunray’ were used to investigate the effect of bulb vernalization at 2.5 °C on plant growth, flowering, and CO2 production (respiration), and to use the CO2 production pattern to monitor the time of flower bud initiation and development. Lily shoot emergence and flowering were accelerated when bulbs received 2.5 °C bulb vernalization; however, flowering was delayed when bulbs were stored at 20 °C before treatment at 2.5 °C; this indicated that bulbs were de-vernalized. The maximum CO2 level, and the minimum level, reached in 78 h in non-vernalized bulbs and in 110 h in 6 weeks of 2.5 °C (6 weeks/2.5 °C) treated bulbs, was increased as the 2.5 °C duration was increased; this indicated that CO2 level can be an useful parameter to measure the cold stimulus (i) accumulated in bulbs following bulb vernalization. The respiration rate higher than the predicted values of the best-fit curves derived from the quadratic equations was designated as Blip A and this was correlated to the time of flower bud initiation and development. Shoot elongation may follow the rise in carbon dioxide levels after reaching the minimum level. It is proposed that increased carbon dioxide levels higher than the predicted levels (Blip A), was correlated to the time of flower bud initiation and development. Measurement of carbon dioxide production upon receipt of bulbs may be a useful technique to provide important information for optimum vernalization treatments for bulbs that have accumulated different levels of low temperature stimulus after bulb vernalization. 相似文献
13.
A study on the physical and physiological characteristics of Rastali bananas (Musa AAB) was carried out throughout the 12 weeks after emergence of the first hand to determine the optimum growth stage of Rastali bananas. The fruit length and diameter followed a trend similar to that observed in fruit fresh weight throughout fruit development, and three physiological stages (S1–S3) of sigmoid growth were identified. The growth rate was slow during S1 (1st to 4th week), rapid during S2 (5th to 10th week) and remained constant during S3 (11th and 12th week). Peel cells underwent periclinal growth, which was accompanied by an increase in fruit peel and pulp thickness as the fruit developed. Moreover, the pulp colour became more vivid and yellow as the fruit developed. The peel moisture content decreased while pulp moisture content increased during fruit growth and development. The pulp firmness increased from the first until seventh week, and it decreased from the seventh week until twelfth week of the experiment. Carbon dioxide (CO2) production was the highest at S1. However, CO2 production declined until the 10th week and remained constant at a low level of 50 mL kg−1 h−1 during S3. Ethylene (C2H4) could not be detected throughout fruit growth and development. Thus, Rastali bananas showed physiological maturity at week 11 and week 12 after emergence of the first hand with constant fruit growth. 相似文献
14.
氮、锌营养与青花菜花球发育过程中核酸及钙调素的关系 总被引：13，自引：1，他引：12
青花菜生长发育过程茎端DNA、RNA、总核酸( TNA) 含量在花序分化前逐渐上升, 分化时达到高峰, 分化后一度下降, 分化1 周时开始回升, 至花球膨大期达到小高峰,花球膨大后期逐渐下降。RNA/ DNA 比值于花序分化前急剧下降, 分化后进一步下降, 现蕾后花球发育膨大期间逐渐回升。茎端钙调素( CaM) 含量在花序分化前逐渐上升, 分化1 周时达到高峰, 花球发育和膨大过程中逐渐下降。氮( N) 、锌( Zn) 营养可促进核酸和CaM 的代谢, 但不同N、Zn 营养组合使核酸合成活力有所不同, 适宜的N 以及增施Zn 对CaM 的合成有显著促进作用。 相似文献
15.
Bulbs of Tulipa gesneriana L. ‘Prominence’ were either specially pre-cooled at 5 ± 0.5°C or held at 17 ± 0.5°C in a flow-through system equipped for atmospheric sampling. Bulbs at 17°C had low CO2 and C2H4 production rates until January when they began to increase. An initial peak of C2H4 production occurred during the 2nd week of pre-cooling, followed by a major increase after 12 weeks. In addition, bulbs were specially pre-cooled for periods of 2–16 weeks (2-week increments). The bulbs were then transferred to 17 ± 0.5°C, where initial periods of special pre-cooling of greater than 12 weeks resulted in a dramatic increase in respiration rate over bulbs cooled for less than 12 weeks. These increases in C2H4 and CO2 liberation appeared to be related to completion of the bulb cold-requirement. However, no surge of shoot elongation occurred after 12 weeks of pre-cooling and transfer to 17°C. 相似文献
16.
LI Xiao-mei YANG Yi-ning MA Yi-tong CHEN Bang-dang LIU Fen HAN Wei GAO Xiao-ming HUANG Ying 《园艺学报》2010,26(2):209-215
AIM: To explore the changes in extracellular regulated protein kinase (ERK1/2) in the hypertrophic myocardium induced by pressure overload at the different time courses and to determine the molecular mechanism in the myocardium from hypertrophy to heart failure. METHODS: C57/BL mice, aged 12 week old, were subjected to sham-operation (SH) or transversing aortic constriction (TAC) to establish left ventricular hypertrophy. Echocardiographic assessments, hemodynamic determination, organ weight measurement, morphological and histological examination were performed at 1, 4, 8, 12 and 16 weeks after surgery. Meanwhile mRNA levels of atrial natriuretic peptide (ANP), α-myosin heavy chain (α-MHC), bcl-2 and bax were measured by RT-PCR, and ERK1/2 levels were detected by Western blotting. The animals in SH group were performed the same tests then sacrificed at 16 weeks. RESULTS: (1) Compared to SH group, LVESd, LVEDd, Awsth, Awdth, Pwsth and Pwdth progressively increased after TAC. Meanwhile, ejection fraction (EF%) significantly decreased at 16th week (P<0.05). LVSP, dp/dtmax and dp/dtmin in TAC group were progressively increased after 4 weeks. From 8-12 weeks these parameters maintained stable and then sharply decreased at 16th week (all P<0.05). However, LVEDP was statistically increased at 8th week. These echocardiographic and hemodynamic changes indicated a development of LVH and eventually progressing towards to heart failure. (2) Histologically, cardiac collagen measured by percentage of Sirius red positive stained area and apoptosis index showed progressive increases from 4 to 16 weeks. (3) Compared to SH group, mRNA levels of ANP was time-dependently increased while α-MHC and Bcl-2 were time-dependently decreased. The ratio of Bcl-2 /Bax was decreased. Phosphorylation of ERK1/2 was increased at 4th week, then decreased with age of TAC (all P<0.05). CONCLUSION: Pressure-overload induced by TAC results in a development of LVH from early concentric hypertrophy to late eccentric hypertrophy, and eventually toward cardiac dysfunction or heart failure. Those changes are associated with increase in cell size and cardiac fibrosis. ERK1/2 signaling pathway may involve in the regulation of myocardial cell apoptosis in hypertrophic and failure heart. 相似文献
17.
Changes in endogenous abscisic acid and soluble sugars levels during dormancy-release of lily bulbs of Lilium rubellum were investigated. Shoot emergence and flowering of the bulbs stored for 14 weeks at 4 °C occurred more synchronously, and the time span from first to last flower in the plants was shorter than those of bulbs stored for 10 weeks at 4 °C. Longer duration of bulb storage showed accelerating effects of increasing leaf number and stem length but negatively affected flower size. Flower number per plant was not much influenced by bulb storage duration. Concentration of endogenous abscisic acid (ABA) level in the bulbs during bulb storage decreased as storage duration increased, and it remained at a constant level after being stored for 10 weeks. This result suggests that the decrease in the endogenous ABA level during bulb storage is correlated with dormancy-release. Concentrations of soluble sugars also changed during bulb cold storage. Sucrose concentration increased as the chilling term increased to 10 weeks but decreased afterward. Glucose and fructose increased from the beginning of chilling to the end of a 14-week cold storage. 相似文献
18.
G. R. Hanks 《The Journal of Horticultural Science and Biotechnology》2013,88(2):343-355
SummaryHot-water treatment (HWT) used to control stem nematode in narcissus bulbs can lead to yield loss through damage to flower, leaf and root initials. Warm storage of bulbs, usually at 30°C, reduces this damage. The effects of two pre-warming treatments (18°C for two weeks or 30°C for one week before HWT) were investigated in bulbs hot-water treated at a range of dates (from early-July to late-September). Experiment 1 was conducted on bulbs of cv. Carlton lifted on three dates. In the year after HWT, flower numbers were much reduced when HWT was applied after mid-August following storage at ambient temperatures, or after late-August following storage at 30°C, but numbers were only slightly reduced even with late-September HWT when given after 18°C storage. Pre-warming was somewhat more effective after early lifting. Late HWT reduced yields of bulbs harvested after two years' growth, but 18°C treatment largely prevented these losses. In Experiment 2, the beneficial effects of 18°C treatment were confirmed in cvs Carlton and Golden Harvest but not in cv. Barrett Browning. These findings are discussed in terms of growth retardation by warm temperatures. 相似文献
19.
AIM: To observe the expression of discoidin domain receptor 2 (DDR2) and matrix metalloproteinase 2 (MMP2) in the rat model of alcoholic liver fibrosis (ALF) with hepatic sinusoidal cappillatization and to investigate the possible effect of DDR2 on the cappillatization of the sinusoids.METHODS: The ALF rat model was established by alcoholic intragastric administration plus with olive oil diet. The liver samples were harvested at the end of 4th, 8th, 12th and 16th week respectively to observe the development of hepatic sinusoidal cappillatization by reticular fiber straining and immunohistochemical staining of collagen type I, Ⅳ and laminin (LN). The expression of DDR2 and MMP2 at mRNA and protein levels was also detected by RT-PCR and Western blotting respectively to make a dependability analysis with the index of hepatic sinusoidal cappillatization. RESULTS: The liver fatty degeneration was observed at the end of 4th week of alcoholic feeding, then aggravated to inflammation and fibrosis as the process of modeling extended. Compared to control group, the mRNA and protein levels of DDR2 in the liver increased markedly in ALF model groups, which also raised gradually as the process of modeling went on (P<0.01). The mRNA and protein levels of MMP2 increased gradually in ALF groups following the aggravation of fibrosis, in which the maximum was observed in 12th week group (P<0.05). The expression of DDR2 had an obviously positive correlation with the expression of MMP2, reticular fibers, collagen type I, Ⅳ and LN. CONCLUSION: DDR2 may participate in hepatic sinusoidal capillarization through the interaction with MMP2. 相似文献