华山新麦草和鹅观草属两个种间物种生物学研究

孙根楼, 杨俊良, 颜济

Sun Gen-lou, Yang Jun-liang, Yen Chi

Received:1900-01-01 Revised:1900-01-01 Online:1993-09-18 Published:1993-09-18
Contact: Sun Gen-lou

摘要：

通过华山新麦草(2n=14，NN)和鹅观草属的两个种(纤毛鹅观草(2n＝28 SY)和鹅观

草(2n=42 SHY))属间杂交，两个组合均得到生长健壮的植株。杂种F₁形态上均为双亲的中

间型。纤毛鹅观草×华山新麦草和鹅观草×华山新麦草杂种F₁染色体配对构型分别为：

20.73I+0.318II，24.80I+1.57II+0.012III。后期I均出现多极分离。两个组合均发现减数

分裂过程异常现象。两个组合染色体配对频率表明，华山新麦草的N染色体组同鹅观草属的S、

Y或H染色体组间存在很小的部分同源性，它们间的亲缘关系甚远。

关键词: 华山新麦草, 鹅观草, 纤毛鹅观草, 染色体组分析

Abstract:

Intergeneric crosses were made betweem Psathyrostachys huashanica

(2n=14, NN)and two Roegneria species, namely, R. ciliaris (2n=28, SSYY),

and R. tsukushiensis (2n=42, SSHHYY). Two combinations of P. huashanica

crossed with R. ciliaris and R. tsukushiensis produced adult hybrid plants. Al-

though completely sterile, the hybrid plants developed rather vigorously, and were

morphologically intermediate between the two parents.Two spikelets per node in

part were observed in hybrids, which evidently came from P. huashanica. The

chromosome configurations of R. ciliaris × P. huashanica and R. tsukushiensis × P.

huashanica were 20.73 I+0.318 II, 24.80 I+1.578 II+0. 012 III, respectively.

Polypolar division was found at anaphase I in meiosis of two hybrids. Abnormal

meiosis in two hybrids was observed. The chromosome pairing indicates that there

is only a little chromosome homoeology between “N” genome of P. huashanica

and “S”, “Y” or “H” genomes of R. ciliaris and R. tsukushiensis.

Key words: Psathyrostachys huashanica, Roegneria tsukushiensis, R. ciliaris, Genome analysis.

孙根楼, 杨俊良, 颜济. 华山新麦草和鹅观草属两个种间物种生物学研究[J]. 中国科学院大学学报.

Sun Gen-lou, Yang Jun-liang, Yen Chi. A Biosystematic Study on Hybrids Between Psathyrostachys huashanica and Two Species of Roegneria[J]. .

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