Genetics of the Fertility Restorer (Rf) Gene which Restores Fertility in Different 	Cytoplasmic Male Sterility Systems (mori, eru and ber) of Brassica juncea

Male sterile plants of Indian mustard (Brassica juncea (L.) Coss.) were observed in the F2 generation of the cross RLM-198 × EJ-33. The genetic analysis revealed that male sterility occurred when the cytoplasm of RLM-198 interacted with recessive nuclear genes of EJ-33. The genetic constitution of RLM-198 was postulated to be (S) RF RF, EJ-33 as (F) rf rf, and the male sterile plants as (S) rf rf. Varieties of Indian mustard from India mostly contained dominant fertility restorer genes, while European varieties had a greater frequency of the recessive maintainer genes. None of these varieties, however, was capable of complete maintenance of male sterility. Heterosis for yield up to 56% over the national check was observed in field trials. The use of this cytoplasmic male sterile plant in hybrid mustard production will not be economical, until a complete maintainer for male sterility is identified.Key words: Brassica juncea, Indian mustard, male sterility, hybrids.

Download Full-text

A binary vector-based large insert library for Brassica napus and identification of clones linked to a fertility restorer locus for Ogura cytoplasmic male sterility (CMS)

Genome ◽

10.1139/g99-104 ◽

2000 ◽

Vol 43 (1) ◽

pp. 102-109 ◽

Cited By ~ 1

Author(s):

Yongzhong Wu ◽

Lomas Tulsieram ◽

Quangzhou Tao ◽

Hong-Bin Zhang ◽

Steven J Rothstein

Keyword(s):

Brassica Napus ◽

Cytoplasmic Male Sterility ◽

Male Sterility ◽

Plant Transformation ◽

Transformation Efficiency ◽

Binary Vector ◽

Brassica Species ◽

Chromosome Walking ◽

Fertility Restorer ◽

Plant Transformation Vector

We constructed and characterized a large DNA insert library for Brassica napus that would facilitate genome-related research and map-based cloning efforts in Brassica species. This library, consisting of 92 160 clones arrayed in 384-well microtiter dishes, was based on a conventional plant transformation vector (binary vector), and was constructed using a single ligation with transformation efficiency of over 5000 recombinants per microliter of ligation mixture. Every clone in this library contains an insert in the size range of 30-190 kb, facilitating both chromosome walking and plant transformation. Screening this library with three DNA markers (C2, F10, and CabR) that are linked to a fertility restorer locus for Ogura cytoplasmic male sterility (CMS) identified at least 17 positive clones for each probe. Among the 17 positive clones identified by C2, nine are linked to the restorer locus. Marker F10 identified 21 clones, of which only two are linked to the restorer locus. None of 68 clones identified by CabR is linked to the restorer locus. A stability test using two clones identified by the C2 marker indicated that large DNA inserts are stable in this conventional vector in both Escherichia coli and Agrobacterium. Key words: Brassica napus, binary vector, large DNA insert library, restorer gene.

Download Full-text