Cytological Investigation of Taiwania flousiana Gaussen (Taxodiaceae)

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Cytological Investigation of Taiwania flousiana Gaussen (Taxodiaceae)

Li Lin-Chu

(Department of Biology, Futan University, Shanghai)

Received:1900-01-01 Revised:1900-01-01 Online:1986-10-18 Published:1986-10-18
Contact: Li Lin-Chu

Abstract

Abstract:

The present paper deals with the cytological investigation of Taiwania flousiana

Gaussen. The somatic chromosomes in root-tip cells of the plant are found to be 2n=22 for

the first time, all with median and submedian constrictions. According to the terminology de-

fined by Levan et al.^[11], the karyotype formula is K(2n)=16m+6sm, which belongs to “2B”

of Stebbins'^[16,17] karyotypic symmetry and is generally regarded as a relatively primitive one.

The species' chromosome complement is 2n=22=4L+6M₂+8M₁+4s according to the standard

defined by Kuo et al.^[10] based on relative length.

The nucleolus number in resting root-tip cells of T. flousiana is found to be 1-5 (Table

3). The percentage of cells with two nucleoli is 77.6%, and those with five nucleoli, the highest

number ever found by me, is only 1.6%. A few cells with many micronuclei are found in this

species for the first time (Plate 1, 1).

Although T. flousiana and T. cryptomerioider have the same “2B” type of karyotypic

symmetry, the differences in the arm ratio and the index of the karyotypic asymmetry (Table

2) show that the karyotype of the former is less symmetrical than that of the latter, so the

former may be a little more advanced than the latter.

The basic karyotype (2B) of Taiwania is more related to that of Cunninghamia (1B)^[3]

than to that (1A) of Metasequoia^[5], Glyptostrobus^[4] and Cryptomeria^[3]. Wang et al.^[1], have

reached the similar conclusion from the embryological study.

Key words: Taiwania flousiana, Chromosome, Karyotype, Nucleolus, Micronucleus, Evolutionary trend

Li Lin-Chu. Cytological Investigation of Taiwania flousiana Gaussen (Taxodiaceae)[J]. .

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Cytological Investigation of Taiwania flousiana Gaussen (Taxodiaceae)

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