Morphological Identification of Elymus sibiricus, E. nutans, and E. burchan-buddae, and Their Genomic Relationships

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Morphological Identification of Elymus sibiricus, E. nutans, and E. burchan-buddae, and Their Genomic Relationships

Lu Bao-rong

Received:1900-01-01 Revised:1900-01-01 Online:1994-11-18 Published:1994-11-18
Contact: Lu Bao-rong

Abstract

Abstract:

In order to investigate morphological variations of Elymus sibiricus L., E. nutans

Griseb., and E. burchan-buddae (Nevski) Tzvelev ［=Roegneria nutans (Keng) Keng］,

and to explore their systematic relationships, six morphological characters were measured

and compared between the Elymus species. Interspecific hybridizations between E. nutans

and E. sibiricus, and E. burchan-buddae were carried out with the aid of embryo rescue.

Chromosome pairing behaviour was also analysed at metaphase- I of meiosis in pollen moth-

er cells of F₁ hybrids. Morphologic characters, such as length of spikes and length of glumes

varied considerably between different individuals of each species, whereas length and width

of paleas were quite stable and different between species. The interspecific hybrids were com-

pletely sterile and their meioses were irregular. Meiotic configuration of E. nutans × E. bur-

chan-buddae was 7.70I +13.40Ⅱ+0.06Ⅲ+0.08 IV, whereas that of E. sibircus×E.

nutans was 11.98I+9.61Ⅱ+0.64Ⅲ+0.39Ⅳ+0.01V. It is concluded from the mor-

phological and cytological study that (1) it is possible to identify the three Elymus species

using the palea character, in addition to other traditionally applied characters; (2) Elymus

nutans and E. burchan-buddae have a comparatively high genomie relationship, while E. nu-

tans and E. sibircus have a relatively low genomic affinity to one another; and (3) a certain

chromosome pairing regulator was presented in the hybrid between E. burchan-buddae and

E. nutans.

Key words: Triticeae, Elymus, morphological variation, genomic analysis, species relationship

Lu Bao-rong. Morphological Identification of Elymus sibiricus, E. nutans, and E. burchan-buddae, and Their Genomic Relationships[J]. .

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Morphological Identification of Elymus sibiricus, E. nutans, and E. burchan-buddae, and Their Genomic Relationships

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