J Syst Evol ›› 1993, Vol. 31 ›› Issue (5): 393-398.

• Research Articles •     Next Articles

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

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

  • Published:1993-09-18

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

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