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青海地区受自然条件的局限,适生树种比较少,在播种育苗生产中,无论采用何种育苗方式,在播种后都应力争使种子早发芽,达到早出苗、早齐苗的要求,才能培育成壮苗。 相似文献
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穴盘基质育苗技术克服了普通露地育苗及传统营养钵育苗成苗率较低、苗期病害难以控制、工本投入高、床地占用面积大等弊端,是蔬菜育苗的一大技术革新,以其出苗整齐、成苗率高、土地利用率提高、缓苗期短、促早发效果明显等优势,在设施蔬菜栽培上逐渐普及应用。现将穴盘轻基质育苗的优势及注意事项介绍如下。1穴盘轻基质育苗具有五大优势1.1出苗整齐,成苗率高穴盘保水性强,轻基质通透性好,在同样进行电 相似文献
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为加快临薯2号紫薯新品种的种植推广,达到高产、高效的目的,采用“3414”肥料试验,研究不同施肥处理对临薯2号产量的影响,并运用“测土配方施肥数据管理系统”中的“3414数据分析”系统工具分析得出最佳施肥量及最高产量。结果表明:不同用量的氮、磷、钾肥对产量影响明显,其中氮、钾肥影响较大,磷肥次之。通过数据分析得到施肥模型:每667 m2最佳施肥量为N 14.15 kg、P2O5 6 kg、K2O 24.13 kg,可得到最佳紫薯产量2 470.91 kg。 相似文献
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甘薯为无性繁殖作物,种质资源材料的创新可通过3种途径实现,常规杂交为主要应用方法;通过无性系变异选择获得特定变异的种质材料有一定难度;通过原生质体融合导入近缘野生种的基因,或通过转基因技术导入外源基因,生物技术的应用在甘薯上取得了一些进展。目前甘薯的主要用途分为两大类,一是利用薯肉为桔红心和紫心的品种作为保健型鲜食品种,二是利用高产、高淀粉含量的淀粉型品种作为工业原料。 相似文献
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ZHU Cheng-lei MU Jing-jing XU Jing-wen WANG Lin-lin ZHOU Zheng-kun ZHENG Yuan-lin CHEN Cai-fa 《园艺学报》2000,36(10):1844-1853
AIM To explore the repair effect of purple sweet potato anthocyanin on intestinal barrier injury of ulcerative colitis mice induced by dextrin sulfate sodium (DSS). METHODS The mice were randomly divided into normal drinking group, DSS model group, different doses of purple sweet potato anthocyanin (12.5, 25, 50 and 75 mg/kg) groups, and 5-aminosalicylic acid (5-ASA) positive drug control group. Except using normal drinking water for control group, the mice in the other groups were treated with 2.5% DSS in drinking water for 7 days to induce the ulcerative colitis model. The mice in purple sweet potato anthocyanin treatment group and the 5-ASA positive drug control group were given the drug by intragastric gavage on the first day of modeling. The body weight of the mice and the hematocheziawere recorded every day. After continuous administration for 8 days, the mice in each group were killed and colon tissue was retained. Immunohistochemical technique (IHC) was used to detect the expression of tight junction protein ZO-1 and occludin and inflammatory factors tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6) in the colon of mice. The expression of mucin in goblet cells of colon tissue was observed by glycogen PAS staining. The protein expression of ZO-1, occludin, TNF-α were determined by Western blot, Sirius red staining was used to detect colonic fibrosis in mice. RESULTS Compared with control group, the disease activity index and histological injury of DSS model mice were significantly increased(P <0.01). Compared with model group, the disease activity index scores of the mice in different dose groups of purple sweet potato anthocyanin were decreased. The expression and distribution of ZO-1 and occludin in colon tissues were increased, and the expression and distribution of TNF-α and IL-6 in colon tissues were decreased. Glycogen PAS staining showed a significant increase in the distribution and expression of mucin in goblet cells of colon tissues in the purple sweet potato anthocyanin treatment group. Sirius red staining also showed that the degree of fibrosis in the purple sweet potato anthocyanin treatment groups was lower than that in model group. CONCLUSION Purple sweet potato anthocyanins has therapeutic effect on ulcerative colitis in mice induced by DSS, mainly through up-regulating the expression of tight junction proteins ZO-1 and occludin, to protect the integrity of intestinal barrier, inhibiting the expression of inflammatory cytokines TNF-α and IL-6 and intestinal fibrosis, to suppress the development of colonic inflammation. 相似文献
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云南甘薯抗旱育苗技术研究 总被引:1,自引:0,他引:1
采取不同的甘薯抗旱育苗措施,对其萌芽出苗、地上部性状等方面进行比较分析。分析结果表明,覆膜覆土、覆盖稻草、覆盖遮阳网能有效减少土壤水分蒸发,增加土壤含水量,有利于甘薯早出苗,具有一定的抗旱作用;盖遮阳网后植株长势弱、易发生徒长;增施有机肥育苗植株长势好,但抗旱效果不明显。 相似文献
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花色苷作为一种天然色素及高抗氧化活性物质,具有优良的保健功效。与地上器官相比,块根、块茎等地下器官中的花色苷具有高含量、高产量、易储存等优点,是一种高效、稳定、易于利用的花色苷来源。彩色马铃薯、紫甘薯、紫淮山等植物地下器官富含花色苷,本文对植物花色苷特别是地下器官花色苷的合成及其调控机制进行了综述,并展望了今后的研究重点。 相似文献
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以‘伏令夏橙’实生苗为材料进行原位转化体系建立及优化。首先,研究侵染部位对原位转化效率的影响:使用带有PBI121载体的农杆菌分别侵染5周龄‘伏令夏橙’实生苗上胚轴切口、顶芽切口(保留/去除真叶)2次,共培养3 d后进行抗性筛选及暗处理,7周后提取叶片DNA用于转基因植株PCR鉴定;之后,以上胚轴切口作为侵染部位进一步研究苗龄对原位转化效率的影响。研究结果表明,5周龄上胚轴切口再生率为93.10%,转化率为20.68%;保留/去除真叶后侵染顶芽时,再生率分别为81.74%和94.55%,转化率分别为19.09%和17.82%;4周龄和6周龄上胚轴切口再生率为94.59%和91.50%,转化率为25.42%和19.36%。可见利用农杆菌介导的遗传转化法原位转化4周龄‘伏令夏橙’的上胚轴切口可获得较高的转化效率。原位转化操作简单、周期短、转化率高,在甜橙遗传育种研究中具有重要的应用价值。 相似文献