Heritability of inflorescence and floret traits in gerbera

Summary Heritability, repeatability, and components of variance were estimated for 68 morphological characters describing the inflorescence, scape, and florets of Gerbera hybrida. The heritability estimates were generally moderate to high for simple dimension characters and characters which were the mean of several measurements, low to moderate for ratio and composite characters, and low for enumeration characters and characters describing the intraplant variation of traits. The repeatability estimates were generally low for intraplant variation characters, moderate for simple ratio characters, and largest for composite and mean characters. For most of the characters, the variance among inflorescences from the same plant was the largest portion of the total phenotypic variance.     

Factors affecting seed yield in white clover

Summary Eighteen clones of white clover chosen at random were examined for their seed setting possibilities. Large differences in the size of the inflorescence and the rate of fertilization were found among the clones, so that breeding strains of white clover with better seed-setting seems possible. The number of ovules per floret seemed not very variable.     

4C─80型微电机驱动采茶机的设计

阐述了一种微电机驱动采茶机的设计方法及有关切割与集叶的理论分析。通过对切割部分的优化设计，找到了减少碎片率的结构参数。     

甘肃定西文冠果花的表型多样性研究

以文冠果花为研究对象,调查了试验区内40株文冠果花的9个表型性状,利用变异系数和方差分析研究了分布区内的变异情况。结果表明,试验区内文冠果花的不同表型性状差异明显,表型性状在不同个体之间存在着较大的变异幅度,其变异系数大小依次为顶花序不孕花数(65.16%)>顶花序孕花数(45.26%)>侧花序长度(32.29%)>顶花序长度(29.28%)>侧花序不孕花数(24.55%)>花瓣横径(20.22%)>花瓣纵径(11.76%)。     

Improvement of somatic embryogenesis and plant regeneration from durum wheat (Triticum turgidum var. durum Desf.) scutellum and inflorescence cultures

Scutellum and inflorescence explants of four genotypes of durum wheat(Triticum turgidum var. durum Desf.) were used to define culture conditions to obtain high frequencies of embryogenesis and plant regeneration in vitro. Under all conditions tested, scutellum cultures gave higher frequencies of embryogenesis and plant regeneration than inflorescence cultures. Two different auxins, 2,4-D(2,4-dichlorophenoxyacetic acid) and picloram(4-amino-3,5,6-trichloropicolinic acid), were compared for their effect on scutellum and inflorescence explant response in vitro. Picloram was found to significantly increase the frequency of plant regeneration from both explants. When cultures were grown on regeneration medium containing zeatin for two three-week passages, the frequency of plant regeneration increased by between 20–30% compared with cultures exposed to hormones for a single three-week passage. Finally, the addition of 1 mg/l 6-BAP (6-benzyl aminopurine) to the plantlet growth medium was found to enhance tiller production in regenerants. The optimized culture conditions were applicable to the four genotypes tested and frequencies of plant regeneration varied between 97% to 100% for scutellum cultures (2 mg/l picloram in induction medium) and between45% and 80% for inflorescence cultures (4 mg/l picloram in induction medium). The number of plants regenerated per explant was improved over previous procedures, with means of 34 plants per scutellum, and 16 plants per inflorescence explant. This revised version was published online in July 2006 with corrections to the Cover Date.     

草木樨种子着生部位成熟度与种性关系的研究

从各不同倍位，成熟度采样，经过含水率，粒级分配，荚壳率，千粒重，发芽率等分析，结果表明草木樨黄熟期，一级侧枝采种，不仅种子量多，产量高，而且千粒重，发芽率，活力指数均高，品质近于完成熟期和主茎部闰的种子，种用性状优异。     

西双版纳澳洲坚果花疫病及其对产量的影响

自年到年对云南省热带作物科学研究所的澳洲坚果花疫病及其对产量的影响进行观察,经鉴19982001定,病原菌为葡萄孢属真菌(Botrytis),最高的发病率达,病情指数为,发病高峰期在月底至 sp.65%14%12月初。病害对产量的影响不明显。     

红掌的花序培养及快速繁殖技术研究

以红掌的幼嫩肉状花序为外植体,筛选各个培养阶段的培养基配方,研究红掌的快速繁殖技术。结果表明:MS BA1 2,4-D0.2对诱导愈伤组织效果最好,MS BA1 KT1 NAA0.1是继代增殖适宜的培养基,1/2MS NAA0.5则促进根的分化和生长。     

短芒大麦草组织培养体系的建立

以短芒大麦草幼穗为外植体,建立了比较稳定高效的组织培养体系.研究结果表明,在含有3.0～4.0mg/L 2,4-D的MS+ 300mg/L CH+3％蔗糖+0.7％琼脂(pH5.8)培养基上,短芒大麦草幼穗切段愈伤组织诱导率可达到80.0％以上;经MS+ 300mg/LCH+0.5mg/L 2,4-D +3％蔗糖+0.7％琼脂(pH5.8)培养基上继代培养后,其胚性愈伤组织在MS+ 300mg/LCH+ 0.5mg/L 2,4-D +0.1 mg/L 6-BA +3％蔗糖+0.7％琼脂(pH5.8)分化培养基上的分化率为62.9％;短芒大麦草组培苗在1/2MS+ NAA0.1mg/L+蔗糖1％+琼脂0.7％ (pH5.8)培养基上生根后,移栽成活率可达到98.0％以上.     

桑叶采摘机主运动系统公差的设计

由于桑叶采摘机主运动系统的精度要求较高,为了降低各相关零部件的加工难度,而又能保证主运动系统的装配精度,对桑叶采摘机主运动系统误差来源进行分析,找出产生误差的主要因素,然后采用修配法和调整法对主运动各零部件的公差进行分析计算.在采用修配法计算时,将平面尺寸链转化为直线尺寸链,以活塞销钉到活塞端部的距离A1为修配环,最后计算出修配环的尺寸.对于桑叶采摘机来说,由于调整件接触处的刚度要求不高,采用调整法效果较好.