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Number 78: 28-33 (1994)
Morphology
and cytology of intergeneric hybrids of Kengyilia gobicola
and K. zhaosuensis crossed with Roegneria
tsukushiensis
Sun Gen-Lou, Yen Chi and Yang Jun-Liang
Triticeae Research Institute, Sichuan Agricultural University,
Dujiangyan city, 611830, Sichuan, China
Summary
Two intergeneric hybrids were obtained from Kengyilia gobicola
Yen et J. L. Yang and K. zhaosuensis J. L. Yang, Yen et
Baum crossed with Roegneria tsukushiensis. Chromosome pairings
were studied at metaphase I in the two hybrids. Meiotic
configurations were 18.69 univalents + 11.56 bivalents + 0.04
trivalents for K. gobicola x R. tsukushiensis,
and 18.56 univalents + 11.73 bivalents + 0.04 trivalents for
K. zhaosuensis x R. tsukushiensis. Lagging
chromosomes at anaphase I and II, tetrads with micronuclei were
observed in these two hybrids. Chromosome bridges were found at
anaphase I and II in K. zhaosuensis x
R. tsukushiensis.
The results indicated that K. gobicola and K.
zhaosuensis share two same basic genomes with R.
tsukushiensis.
Introduction
Kengyilia Yen et J. L. Yang is a new genus found in west
China (Yen and Yang 1989, 1990). Kengyilia gobicola Yen et J.
L. Yang, a hexaploid (2n = 42) (Sun et al. 1989) perennial grass, is
distributed in Gobi Desert at the foot of Muztagata Mt., Xinjiang,
China. This species has short, rod-like leaves that form tube-like
structures and much hair on the adaxial epidermis of leaf blade. The
adaxial epidermal surface of the blade is covered with a thick
cuticule layer and bears few stomata. The deep root with dense root
hair holds sand around it in the form of a sand sheath. The hairy
spike reduces evaporation to protect the physiological activity of
this important reproductive organ. These characteristics make K.
gobicola a good drought resistant plant (Yen and J. L. Yang
1990).
Kengyilia zhaosuensis J. L. Yang, Yen et Baum, a hexaploid (2n
= 42) (Sun et al. 1989,1993), perennial plant, is distributed in
Zhaosu country, Xinjiang.
K. gobicola and K. zhaosuensis are new species which
were found in recent years. The karyotypes of them were reported by
Yen and J.L. Yang (1989), and Sun et al. (1993).
Roegneria tsukushiensis (Honda) B. R. Lu, Yen et J. L. Yang, a
popular grass growing along the fields and road-sides, is widely
distributed in China, Korea and Japan (Ohwi 1965, Lu et al.1990).
This species is allohexaploid (2n = 42), which comprises three
different genomes (Sakamoto 1964, Dewey 1984, Lu et al.1990).
In an attempt to explore the biosystematic relationships of K.
gobicola and K. zhaosuensis with R. tsukushiensis,
the artificial hybrids were made from R. tsukushiensis
crossed with K. gobicola and K. zhaosuensis.
The morphological and cytological analyses of these
hybrids are reported in the present paper.
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