Abstract:用具有粘果山羊草(Ae. kotschyi)细胞质的1B/1R易位系转育成的K型小麦雄性不育系为基本材料,通过随体数目和C—显带技术鉴定了不育系、恢复系及其亲本的染色体组成,以中国春重双端体2t″1B和缺—四体1B°1D~Ⅳ与其杂交,观察了F_1减数分裂中期Ⅰ的染色体构型和C—显带特征。调查了有代表性的10个k型不育系及其中三个不育系与中国春重双端体2t″1B或缺—四体1B°1D~Ⅳ杂交F_1的单倍体诱导频率。结果表明,多数k型1B/1R不育系均可产生较高频率的单倍体,但不育系间差异很大,个别k型1B/1R不育系不产生单倍体,说明单倍体的产生除受1R短臂上的诱导单倍体基因作用外,还受其他基因的影响,同时也受父本基因型和染色体结构的影响,试验证明,1B染色体缺失或端体等非整倍体作为父本可以大大提高诱导单倍体的频率(接近70%),这种方法诱导产生的是单倍体种子,一般发芽正常,发育良好,在异质小麦育种方面具有重要实践意义。但由于这种单倍体均为孤雌生殖所致,应用受到一定限制,因此本文提出了如何应用的参考方案。

Abstract:本属值物为典型的亚洲温带分布,其种的数目约80余种,中国约60余种,本区23种。在中国主要分布于我国内陆及其毗邻的外围山地以及中国喜玛拉雅植物区系地区。而黄土高原和秦岭山地正处于上述地区的交汇或过渡地区,也就是一方面随东南季风影响的程度不同而产生的温带落叶阔叶林到草原和荒漠的过渡,另一方面随着山地的隆起由东北至西南方向的桥梁作用而产生的西伯利亚和中国喜玛拉雅的过渡。因此,本区锦鸡儿属植物的分类学研究对于本属植物的起源、分布和经济开发利用等方面都有重要的意义。

Abstract:The callus and plantlet were produced successfully from the mature organs: leaves, perianth, filaments and unpollinated ovaries of lily (L(?)ium longifiorum Thunb. ). Results of experiment proved the plant mature tissue has the totipotency also. It was fo

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Abstract:Observations on behavior of callose deposition in the cell walls during megasporogenesis in broad beau have been made using the method of leuco aniline blue-induced fluorescence. The results are summarized as follows: (1) Callose was absent in the wall of

Abstract:This paper describes the anatomical structure of the petiole in 10 species of Populus, the 10 species have been divided into three sections. Three vascular bundles euter the base of petiole, in transverse sections through the distal end, petiole is exhibi

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Abstract:This test involved the selection of sixteen wheat varieties which had been planted in three ecological areas of shaanxi province for many years. A classification function and canonical discriminant analyst were the two meathods of discriminant analyst of

Abstract:In this paper the wall degradation hypotonic method of preparing mitotic chromosome sample in plant was used for the karyotype analysis of root tip cells of the two varieties of rye (Secale cereale L.). They are diploid species. The karyotype formulas of

Abstract:Essential oils has been obtained from Fi(?)fo(?)um sibiricum Kitan by steam distillation in 0.52% yied with d_40~(20) 0.8503, n_D~(20) 1.4680. By GC-MS, altogether 25 chemical constituents were separated and identified. Their content aceouted for 55.6% of