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Biosystematic studies on Hystrix longearistata from Japan and Hystrix duthiei from China (Poaceae: Triticeae)

ZHOU Yong-Hong, YANG Jun-Liang, YAN Ji, ZHENG You-Liang   

  • Received:1900-01-01 Revised:1900-01-01 Online:1999-07-10 Published:1999-07-10
  • Contact: ZHOU Yong-Hong

Abstract:

Morphological comparison, cytogenetic study and fertility analysis of Hystrix
duthiei (2n = 28) from China, Hystrix longearistata (2n= 28) from Japan and their artifi-
cial hybrids were carried out. Morphologically H. duthiei was similar to H. longearistata.
H. longearistata had longer lemma awn, wider leaf and 2～3 florets per spikelet, while H.
duthiei had 1～2 florets per spikelet. These two taxa can be easily crossed. Fl hybrids
showed very high degree of bivalent pairing (13～14 bivalents) at the metaphase- I of meio-
sis. No multivalents were found. The fertility of pollen and seed set of the parents were nor-
mal, while the Fl hybrids were of only partial fertility. H. longearistata was closely related
to H. duthiei. They should be included in the same species. Because of the differences of
their distributions and habitats, some morphological divergency and a little sterility barrier
have had appeared between them. It is reasonable to treat Hystrix longearistata as a sub-
species of Hystrix duthiei .

Key words: Hystrix duthiei, Hystrix longearistata, Interspecific hybrids, Biosystematcs

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