ba3
(formerly designated ba*-861059b)
- a new barren-stalk locus
--Yong-Bao Pan and Peter A. Peterson
ba*-861059 (ba*) is a barren-stalk
mutant derived from the progenies of a WSMV infected maize plant (MNL 62:4).
It is a single recessive gene. Its relation to the three previously described
barren-stalk mutant genes, ba1, ba2 and baf (Annu.
Rev. Genet. 22:352), has been tested. The results are summarized as follows:
Cross type
|
No. of crosses
|
Progeny per cross tested
|
Ba*/ba* x ba1/ba1
|
1
|
13
|
Ba1/ba1 x ba*/ba*
|
1
|
14
|
Ba2/ba2 x Ba*/ba*
|
1
|
24
|
Ba2/ba2x ba*/ba*
|
3
|
13
|
Ba*/ba* x ba2/ba2
|
5
|
13-14
|
Baf/baf x Ba*/ba*
|
1
|
22
|
Baf/baf x ba*/ba*
|
2
|
13
|
Ba*/ba* x Baf/baf
|
4
|
13-14
|
That none of the designated crosses
yielded any barren-stalk progeny provides genetic evidence that ba*
is not allelic to ba1, ba2 or baf and represents a
new independent locus influencing the barren-stalk trait. We conclude that
a mutation at any of these 4 loci could cause a barren-stalk phenotype
and that these 4 (possibly more) genes act in different steps in a pathway
leading eventually to a barren-stalk phenotype. We designate ba*-861059b
as ba3.
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