A Biosystematic Study on Hybrids Between Psathyrostachys huashanica and Two Species of Roegneria

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

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.

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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