长芒猬草与华山新麦草属间杂种的形态学和细胞学研究

为研究长芒猬草Hystrix duthiei ssp．longearistata的染色体组成，将其与华山新麦草Psathyrostachys huashanica进行了人工杂交，获得杂种F1。对亲本及杂种F1，花粉母细胞减数分裂染色体配对行为、繁育 特性和形态特征进行了比较分析。结果表明：杂种F1的许多形态特征介于父母本之间，花粉完全不育， 结实率为0；杂种F1花粉母细胞减数分裂中期Ⅰ染色体配对较高，55.12％的细胞形成5个或6个二价 体，其构型为：9.83Ⅰ+5.46Ⅱ+0.07Ⅲ，C-值为0.57。以上结果表明H．duthiei ssp．Longearistata含有Ns染色体组。本文还讨论了Hystrix与Leymus的关系。

Morphology and cytology of intergeneric hybrids between Hystrix duthiei ssp. longearistata and Psathyrostachys huashanica （Poaceae: Triticeae）

 In order to determine its genomic constitution,  Hystrix duthiei ssp.  longearistata was crossed with Psathyrostachys huashanica. Hybrids were obtained successfully from this combination. Morphology, fertility and chromosome pairing behavior in meiosis of the parents and their hybrids F1 were investigated. The results showed obvious morphological differences between H. duthiei ssp. longearistata and P. huashanica, and intermediate spikes of the F1 plants between the two parental species. The hybrids were completely sterile. Chromosome pairing at MI of PMCs in F1 hybrids was relatively high and 55.12% of PMCs showed 5 or 6 bivalents per cell. Meiotic configurations were 9.83 Ⅰ + 5.46 Ⅱ+ 0.07 Ⅲ, with C-value of 0. 57, which indicated that H. duthiei ssp. longearistata and P. huashanica should share one Ns genome. The relationship between Hystrixand Leymus was also discussed.