外源海藻糖对NaHCO3胁迫下甘草幼苗生长调节及总黄酮含量的影响

本研究以甘草无菌苗为试验材料,采用植物组织培养的方法,分析50 mmol·L^-1 NaHCO₃ 胁迫下外源海藻糖对甘草幼苗生长量、叶绿素含量、渗透调节物质含量、抗氧化保护酶活性和总黄酮含量的影响。结果表明： 50 mmol·L^-1 NaHCO₃ 胁迫显著降低了甘草幼苗的生长量、叶绿体色素含量、K⁺ 浓度、抗氧化保护酶（SOD、POD、CAT）活性和总黄酮含量,显著提高了丙二醛、脯氨酸和可溶性糖含量以及Na⁺浓度;施加15 mmol·L^-1 海藻糖可显著提高甘草幼苗的生长量,提高叶绿素含量、K⁺ 浓度和总黄酮含量,降低丙二酸含量、脯氨酸含量、可溶性糖含量和Na⁺ 浓度,并且提高抗氧化保护酶活性。因此,NaHCO₃胁迫下施加外源海藻糖对甘草幼苗生长具有良好的调节作用,可以增强甘草的抗碱能力,促进甘草幼苗生长。本研究为外源海藻糖提高甘草耐碱性和揭示其调控机制提供理论依据。     

菠萝蜜芽苗砧嫁接育苗技术

菠萝蜜是广泛栽培在我国华南地区的著名热带水果。培育菠萝蜜种子芽砧苗，采用优良菠萝蜜品种作接穗进行嫁接育苗，操作简单易掌握，相对其他嫁接育苗方法，嫁接成活率高，育苗时间短，是值得推广的一种嫁接育苗方法。     

竹酢液对杉木苗木生长的影响

以1年生Ⅰ级杉木裸根苗为研究对象,通过盆栽试验,比较喷施及土壤施入两种施用方法及7个不同浓度处理下,竹酢液对苗高、地径以及枝叶生物量、根系生物量和主干生物量影响,同时对不同处理下苗木净光合速率的变化特征进行了比较分析。结果表明：竹酢液合理使用可以明显促进苗高和地径的生长、提高枝叶生物量和根系生物量;竹酢液可以提高苗木的净光合速率,改善光合作用;P300和P800两种浓度和施入方法促进杉木苗木生长的作用最明显。     

Exogenous Nitric Oxide Involved in Subcellular Distribution and Chemical Forms of Cu~（2＋） Under Copper Stress in Tomato Seedlings

Nitric oxide（NO）,a bioactive signaling molecule,serves as an antioxidant and anti-stress agent under abiotic stress.A hydroponics experiment was conducted to investigate the effects of sodium nitroprusside（SNP）,a NO donor,on tomato seedlings exposed to 50 μmol L-1CuCl 2.The results show that copper is primarily stored in the soluble cell sap fraction in the roots,especially after treatment with Cu＋SNP treatment,which accounted for 66.2% of the total copper content.The copper concentration gradually decreased from the roots to the leaves.In the leaves,exogenous NO induces the storage of excess copper in the cell walls.Copper stress decreases the proportion of copper integrated with pectates and proteins,but exogenous NO remarkably reverses this trend.The alleviating effect of NO is blocked by hemoglobin.Thus,exogenous NO is likely involved in the regulation of the subcellular copper concentrations and its chemical forms under copper stress.Although exogenous NO inhibited the absorption and transport of excess copper to some extent,the copper accumulation in tomato seedlings significantly increased under copper stress.The use of exogenous NO to enhance copper tolerance in some plants is a promising method for copper remediation.     

Outdoor winter storage of container stock on raised pallets—effects on root zone temperatures and seedling growth

Containerized seedlings of Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris L.) were overwintered on the ground and above ground on pallets. Soil temperatures in elevated containers were lower and showed greater fluctuation than containers on the ground. The lowest temperatures (‐15 to ‐16°C) were observed in containers stored on pallets with little or no snow cover during the winter. Temperatures in the edge rows of containers were lower than interior bed soil temperatures. Lower temperatures were also observed in the top than in the bottom of the container. The storage on pallets resulted in reduced shoot and root growth. Although insulation preventing air movements beneath the container units improved soil temperature conditions and subsequent seedling growth, the best result was obtained when seedlings were stored directly on the ground surface.     

不同营养基质对红松容器育苗的影响

采用草炭土、腐殖土、马粪、有机肥、锯末、河沙等作为营养土的基本原料,进行了红松容器育苗试验,试验结果表明,草炭土+腐殖土、腐殖土+马粪(鲜)、草炭土+马粪(鲜)是适合红松生长的3种最佳基质配方,同时还观察了不同播种时间对红松容器苗生长的影响。     

水稻机插秧的育苗播种量研究

为提高水稻机插秧的质量,对水稻培育壮秧的影响因素进行分析,并以盘锦地区常用的水稻手扶式插秧机为例,对育苗播种量进行计算,结合实践经验,总结适宜盘锦地区水稻育苗的播种量以及播种作业原则。     

壮禾增浸种培育壮秧机理研究

为探讨壮禾增浸种培育壮秧的生理机制，本文比较了用壮禾增浸种和用清水浸种对水稻种子生理特性、萌发和成苗等方面的差异以及这些差异在秧苗素质上的反映，分析了浸种时间对种子活力的影响。结果表明，用壮禾增浸种适宜时间可提高种子活力指数（ＳＶＩ）６．１％～１６．３％，田间播种成苗率提高５．３％，种子脱氢酶活性和淀粉活性显著增强，分别提高１２．４％和１３．２％，呼吸强度增加９．９％，种子生根出芽所需营养底物的供给得以加强，而且种子生活力的提高有助于秧苗的生长，秧苗根系发达，且抑制顶端优势，促进横向生长，分蘖发生早而快，叶片叶绿素含量高，光合物质积累多，秧苗综合素质提高。     

落叶松播种苗使用钼酸铵根外追肥试验报告

通过对落叶松播种苗根外追施钼酸铵液，促进苗高，地径生长，较明显地提高了苗木整体质量，对苗木木质化和提高苗木对不良环境的抵抗力有着积极的促进作用。     

水稻苗床增温剂及分蘖促进剂示范试验报告

通过对水稻施用苗床增温剂及分蘖促进剂试验示范研究,结果表明,增温剂及分蘖促进剂处理增加了水稻苗期的充实度,保证了壮苗,提高了后期的分蘖数与结实率。从产量结果上看,增温剂及分蘖促进剂处理较对照增产33.9 kg/667 m2,增产率为5.5%。