A preliminary account of growth characteristics and seed germination of Cassia mimosoides L. in Dohne Sourveld

An autecological study of Cassia mimosoides L., which invades mismanaged Dohne Sourveld, was initiated at the Agricultural Research Institute, Dohne. A study of the growth characteristics revealed that the nature of the root distribution enabled the plant to take up moisture from superficial as well as deeper soil layers, while the position of the crown buds at or below soil level offered protection from fire damage. These characteristics plus the unpalatability of the plant to sheep and cattle placed it in a favourable position in competition with grasses. However, the relatively low‐growing C. mimosoides plants appeared to be at a disadvantage in rested veld. Although seeds were dormant when released, germination took place and seeds retained their viability over a long period. Under natural conditions the germination of non‐dormant seeds was controlled largely by temperature and moisture. Few seedlings established themselves in rested veld. It was suggested that a long rest period for the veld, followed by a spring burn, would be most effective in controlling the establishment of seedlings.     

石榴籽中微量元素含量及挥发油成分分析

采用火焰原子吸收分光光度法和气质联机测定了不同石榴籽中微量元素的含量和挥发油成分。结果表明,同一地区不同石榴籽中微量元素的含量和挥发油组分存在明显差异。     

一株放线菌代谢产物对桑种子萌发和幼苗生长的影响

为拓宽放线菌生物活性物质的功能应用,用不同浓度的蚯蚓内附生放线菌AEC 2代谢物处理桑种子,探讨其对桑种子萌发和幼苗生长的影响.结果表明:放线菌AEC 2代谢物能够提高桑种子的质量和品质,提高种子发芽率和发芽势,缩短发芽时间,提高胚轴／胚根长,且浓度越低效应越好,但差异不显著.AEC 2代谢物能够显著提高幼苗可溶性蛋白含量、促进种子中贮存物快速转化为可溶性糖类、提高氧化酶活性,平衡氧化和抗氧化水平,使幼苗的新陈代谢水平处于活跃状态.在试验浓度范围内以0.031 25 mg/ml效果最佳.     

红麻皮籽兼收优化栽培技术研究

为解决红麻皮籽兼收的新技术,提高农民的经济效益,进行了红麻不同种植时期、不同种植密度、不同收获时期、不同红麻品种等处理的研究。试验表明,红麻的种植时间为5~7月、红麻的种植密度为10.5~13.5万株/hm2、红麻籽收获时间为12月中下旬、红麻果柄最下一粒朔果下10~15cm位置收割,可皮籽兼收,麻籽产量达1 755~2 940 kg,麻皮产量达4 350~5 670 kg。     

红麻皮籽兼收优化栽培技术研究

为解决红麻皮籽兼收的新技术，提高农民的经济效益，进行了红麻不同种植时期、不同种植密度、不同收获时期、不同红麻品种等处理的研究。试验表明，红麻的种植时间为5～7月、红麻的种植密度为10.5～13.5万株/hm2、红麻籽收获时间为12月中下旬、红麻果柄最下一粒朔果下10～15cm位置收割，可皮籽兼收，麻籽产量达1 755～2 940 kg，麻皮产量达4 350～5 670 kg。     

出口波斯菊种子的处理技术研究

以出口波斯菊种子为材料,研究了精选量与容重和发芽率的关系。结果表明:种子的发芽率与容重都随着精选程度的提高而增加,呈正相关关系。精选量和效益的关系是种子精选的实质问题,精选量越大,效益越差,呈反相关关系。两者的最佳平衡点在精选量35%左右。     

Paternal contributions following artificial pollination in Pinus sylvestris (L)

Utilizing the isozyme technique, the genotypes of mature germinable embryos and the corresponding macrogametophytes were classified. The proportion of embryos originating from fertilization with a certain pollen parent was studied following pollination with pollen mixtures or pollen applied on different days. The proportion of fertilized mature embryos arising through self‐pollination was considerably lower than the proportion of selfpollen in the mixture used for pollination. In a mixture with an equal representation of two outcrossing pollens, roughly the same share of fertilized embryos was obtained. Pollinating at different occasions demonstrated that pollination is effective immediately after the opening of the first ovuliferous scales, while supplementary pollination after the peak receptivity is not effective.     

江西省多花黑麦草种子生产技术规程

为了规范江西省多花黑麦草的生产，针对江西省多花黑麦草种子生产基地中的实际情况，依据国家、行业标准，对江西省多花黑麦草种子生产的环境条件、播种、田间管理和检验、收种、清选、贮藏等提出了具体要求和规定。该生产技术规程对江西乃至南方诸省多花黑麦种子的生产具有重要的现实指导意义。     

青钱柳种子不同部位发芽抑制物质的测定

对青钱柳种子不同部位乙醚提取液进行了生物测定并对果皮和种皮提取液进行GC-MS鉴定,结果表明:青钱柳种子不同部位乙醚提取液的抑制强度为果皮>种皮>种胚;果皮和种皮乙醚提取液的GC-MS鉴定结果显示,青钱柳种子中存在庚酸、辛酸、棕榈酸和邻苯二甲酸二乙酯等发芽抑制物质。对邻苯二甲酸二乙酯和棕榈酸标准品进行生物测定,确定其半抑制浓度(IC50)分别为478.63μL/L和602.56mg/L。     

山皂荚籽不饱和脂肪酸含量的测定

本实验测定山皂荚籽中粗脂肪的质量含量为41.0g/kg.分析脂肪酸组成。实验结果表明,山皂荚籽主要含有不饱和脂肪酸,占脂肪酸总成分的82.7%,其中以亚油酸相对含量最高为56.31。