New Materials for Chinese Brassica (Cruciferae)

Lan Yong-Zhen, Cheo Tai-Yien

Received:1900-01-01 Revised:1900-01-01 Online:1991-01-18 Published:1991-01-18
Contact: Lan Yong-Zhen

Abstract:

The present study deals with external morphology, chromosome number, pollen

morphology and seed anatomy of three species of Brassica in China. The results are sum-

marized as follows:

1. Brassica xinjiangensis is described as a new species based on the chromosome num-

ber n=9, and 3-4-colpate and reticulate pollen grains. In the transverse section of seed,

epidermal cells are triangular, semiterete or irregular, subepidermal cells consist of one se-

ries, palisade cells terete and equal in length. Leaves are petiolate or not; stems, sepals,

pistils and siliquae are usually covered with retrorse-pilose hairs; rostrum stout, 12 mm long.

By the above characters this species differs from others in this genus.

2. Relationship between B. nigra and B. xinjiangensis. In the former all leaves are

petiolate, and the lower part of stems and leaves usually bristly; sepals, pistils and siliquae

are glabrous; pedicels are erect and appressed to the axis of infructescence; rostrum is gra-

cile, 2.5 mm long. The chromosome number is n=8. Pollen grains are 3-colpate; the exine

is cerebroid-reticulate under SEM. In the transverse section of seeds, epidermal cells are

undulate, subepidermal cells in 1-2 series, palisade cells terete, short and unequal in length.

These characteristics are the same as reported by Koch (1833), Darlington and Wylie (1955),

Goldblatt (1981), Vaughan et al. (1971), Lan (1986).

3. Taxonomical position of B. celerifolia. It was treated as B. juncea var. celerifolia

by Tsen et Lee (1942). According to the chromosome number n=10, 3-4-colporate pollen

grains, it deserves specific rank. This species differs from B. juncea, which has the chromo-

some number n=18 and 3-4-colpate pollen grains.

Key words: Brassica, B. xinjiangensis, B. nigra, B. celerifolia

Lan Yong-Zhen, Cheo Tai-Yien. New Materials for Chinese Brassica (Cruciferae)[J]. .

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[2]	Wei Wei, Han Lu, Guan Zi-Qiu, Chai Tuan-Yao. Overexpression of BjPCS1 gene from Brassica juncea enhances the heavy metal tolerance in transgenic tobacco [J]. , 2008, 25(4): 510-517.
[3]	LIU Ai-Hua, WANG Jian-Bo, ZHU Ying-Guo. RAPD analysis on the genome evolution of polyploids in Brassica [J]. , 2003, 41(6): 520-530.
[4]	Lan Yong-Zhen, Gheo Tai-Yien, Qian Wei-Zhen. Studies on the Pollen Morphology of the Genus Brassica (Cruciferae) in China [J]. , 1989, 27(5): 386-394.
[5]	Yang Ping, Li Rong-Qian, Zeng Zi-Shen. Studies on the Karyotypes and Pollen Morphology of Brassica oleracea L.and B. alboglabra Bailey [J]. , 1988, 26(5): 362-366.
[6]	Lan Yang-Zhen. Chromosome Numbers of Brassiceae (Cruciferae) in China [J]. , 1986, 24(4): 268-272.

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