不同激素处理对厚荚相思组培苗生根及移栽效应

以改良MS为基本培养基,使用不同浓度的NAA、IAA、ABT、IBA和MET对厚荚相思无菌苗进行生根诱导,生根苗按使用不同的激素处理分别进行移栽试验.厚荚相思生根诱导率为11%～100%,其中以改良MS NAA1.0 mg/L的生根率最高,达100%;以黄心土为基质对生根苗进行移栽,移栽成活率为41.25%～81.79%,其中成活率最高为使用NAA诱导生根的生根苗,成活率达81.79%.     

4PU、NAA、IBA在中华猴猕桃微繁殖技术中的应用研究

研究结果表明:1.使用新型的苯基脲衍生物4pU与生长素配合,可明显提高茎段和离体叶片的分化,其活性约为6苄基氨基嘌呤、6-BA)、玉米素(ZT)的10倍。2.在附加4pU(1毫克/升)的培养基上,分化不定芽和茎段丛生芽,个体发育较弱,须经在低浓度4pU(0.3～0.5毫克╱升)和6-BA(1毫克/升)培养基中再培养,方可获得健壮的试管苗。3.中华猕猴桃试管苗在1/2MS+NAA_(0.5)+IBA_(0.5)的培养基中培养10天后,移栽成活率可达95％左右。     

树干钻孔注药提高大规格珍贵濒危苗木移植成活率初探

本文通过树干注药补水,对不易成活的大规格珍贵濒危树种的移植成活率进行了探讨,试验结果表明:此种方法对提高大规格珍贵濒危树种苗木的成活率效果显著,且此种方法简单易行、成本低廉,在不易成活的珍贵濒危树种的移植保护及提高大规格工程绿化苗木的成活率工作中很有实用价值。     

Early gains from planting large-diameter seedlings and intensive management are additive for loblolly pine

A seedling size/intensive management study with Pinustaeda L. was established in 1993 on two sites in the CoastalPlain of Georgia and South Carolina. Each site contained a 2 × 2split-plot study involving two seedling sizes and two levels ofestablishment intensity. Ideotype ``B' seedlings averaged 5.0 mmin diameter (at the root collar) and were 43 cm tall. Ideotype``A' seedlings averaged 8.5 mm in diameter and were 50 cm tall. ``Standard' establishment practices included herbicides(hexazinone and sulfometuron) and fertilizer (DAP) appliedduring the first year. The ``intensive' management involved twoherbicide applications during the first year and two during thesecond year, fertilizer during the first and third years, andinsecticide applications during the first two years (for controlof tip moth, Rhyacionia frustrana Comstock).Intensive management did not affect survival but planting largerseedlings increased survival slightly on one site. However,treatments affected early growth at both sites. On both sites,fourth-year plot-volumes were increased with greaterestablishment intensity and larger seedlings but there was nointeraction between stock size and establishment intensity. Early growth gains were greatest when both intensive managementand larger seedlings were combined. Depending on site, thiscombination resulted in 21% to 51% more volume (at age 4) thanthe next best treatment (standard seedlings with intensivemanagement).     

桐棉马尾松芽苗截根移栽试验

应用ＬＯＴＵＳ１－２－３图表分析集成软件，对芽苗不同截根移栽处理与对照进行比较分析。结果表明：芽苗截根移栽后，能有效地抑制主根生长，促进侧根生长发育，且高径比下降２３．４％，Ｔ－Ｒ率下降２２．３％，苗木全株干重增加５１．１％；截根能使苗期的地上与地下部分生长趋于协调，图示聚类分析还表明，截根处理以保留根毛区约２／４－３／４根长为宜。     

红掌组培快繁中若干问题的探讨

通过红掌组培快繁生产实践认为:正确选择品种和外植体、简化培养过程是组培快繁生产的关键,而降低成本、提高瓶苗移栽管理技术是实现高效益组培苗生产的根本途径。     

Effect of Photoselective Sheet and Grafting Technique on Growth,Yield, and Mineral Composition of Sweet Pepper Plants

ABSTRACT

The effect of two thermal photoselective polyethylene sheets with or without solar heat reflection pigments (SHRP) combined with two transplant types (grafted or un-grafted) were analyzed in sweet pepper plants. The selective transmittance through the photoselective sheet increased the temperature inside the greenhouse compared with the standard sheet. Plants grown under SHRP sheet significantly increased total leaves fresh weight and total fruit yield. When plants were grafted, leaf and stem fresh weight were reduced compared with the ungrafted plants, but total fruit number was increased. Leaf nitrate (NO₃ ^?) concentration was affected by both sheet and transplant type at early stage of crop development but not at later stages. Total-nitrogen (N) was found to be higher in grafted plants, but with a lower microelements concentration. Grafted plants had an increased the number of days to harvest at the second truss, reducing significantly its weight and size. But at the end of the crop cycle, these plants showed higher total marketable yield than the un-grafted plants. Plant grown under SHRP sheet showed higher yield than those plants under standard sheet. Results shows that new cultivation techniques such as use grafted plants and new thermal photoselective sheets should be take into account to increase yield of sweet pepper under semi-arid conditions.     

苗木移栽管理技术要点

针对苗木移栽生产实践当中遇到的实际问题,总结出选苗护根、根系蘸浆、施肥、栽后管理等主要技术要点。     

水稻直播技术探讨

介绍国内外水稻直播技术的发展现状,分析水稻直播技术的优点,阐明水稻直播技术的实施要点。与传统水稻栽培方式相比,水稻直播技术省却了育秧、拔秧、插秧环节,节省了大量时间和人力、财力、物力,使复杂的种植程序得以简化、劳动力得到进一步解放、种植成本大大降低,是传统水稻种植方式的重大变革。     

特种油料新作物好好芭(Jojoba) 组织培养研究进展

概述了好好芭组织培养和植株再生的研究成果以及研究进展。包括培养基及生长调节物质的应用规 律,外植体的获取和处理及转接的方法,环境因子对克隆苗的影响,以及移栽环节的做法和不足。探讨了研究中的 重点和普遍问题,并分析了问题产生的可能原因,指出了研究中的不足,明确了好好芭组织培养研究的思路及研究 方向。