Pisum Genetics

Volume 24

1992

Contents

TABLE OF CONTENTS	Page
Cover Legend
Preface...........................................................................................................................	1
Review
The symbiosis genes of pea. T.A. LaRue and N.F. Weeden................................................................................	5
Research Reports
A new allele, st^bs, at the St locus. S. Apisitwanich and W.K. Swiecicki.......................................................................	13
A new ramosus gene on chromosome 5. S. Apisitwanich, W.K. Swiecicki and B. Wolko......................................................	14
A second gene for leaf edge necrosis, len-2, located on chromosome 5. S. Apisitwanich, W.K. Swiecicki and B. Wolko......................................................	16
Branching in Pisum: inheritance and allelism tests with 17 ramosus mutants. E.L. Arumingtyas, R.S. Floyd, M.J. Gregory and I.C. Murfet..................................	17
The genetic basis of early flowering in mutant line I/178. E.L. Arumingtyas and I.C. Murfet...........................................................................	32
The neoplastic pod gene (Np) may be a factor for resistance in pea to the pest Bruchus pisorum L. V.A. Berdnikov, Y.A. Trusov, V.S. Bogdanova, O.E. Kosterin, S.M. Rozov, S.V. Nedel'kina and Y.N. Nikulina..............................................................	37
Manifestation of the Lf locus in tissue culture of pea. T.A. Ezhova and O.V. Kovalenko..........................................................................	40
Evidence supporting the revision and integration of the pea chromosome 7 linkage map. K.M. Folta and N.O. Polans...................................................................................	44
Twisted tendrils (Twt) - a phenotype associated with a translocation involving chromosome 1. F.L. Gorel, S.V. Temnykh, I.P. Lebedeva and V.A. Berdnikov...........................	48
Linkage relationship between genes Fw and Fnw. M.J. Grajal-Martin and F.J. Muehlbauer.................................................................	52
Linkage of Td with markers on linkage group III of peas. M.J. Grajal-Martin and F.J. Muehlbauer.................................................................	54
Mapping of the third locus for histone H1 genes in peas. O.E. Kosterin.........................................................................................................	56
Two waxless mutants of somaclonal origin in pea. O.V. Kovalenko and T.A. Ezhova..........................................................................	60
Internode length in Pisum: phenotypic characterisation and genetic identity of the short internode mutant Wt11242. J. Kusnadi, M..Gregory, I.C.Murfet, J.J. Ross and F. Bourne...................................................................................................................	64
Expression of det (determinate) in genotypes Lf^d, Lf, lf and lf^a. I.C. Murfet.............................................................................................................	75
The mapping of Pea-2 supports the assignment of Vc-5 and rb to a specific region of chromosome 3. N.O. Polans and K.M. Folta..........................................................	79
coch and het are allelic. S.M. Rozov, F.L. Gorel and V.A. Berdnikov..........................................................	82
Internode length in Pisum. Interaction of genes lhⁱ, la and cry^s. S.M. Swain and J.B. Reid.......................................................................................	83
Internode length in Pisum. Two further lv mutants. J.L. Weller, I.C. Murfet and J.B. Reid.....................................................................	86
Forum
Correction to the description of the expression of the 'bipartitus' (bip) gene in some of the published literature. F.N. Green, P.W. Winfield and M.J. Ambrose..........................	90
The pea map - comments from a frustrated Mendelian geneticist N.F. Weeden..................	91
Germplasm
Pisum Genetics Stocks Centre. M. Ambrose and S. Blixt..................................................	92
Wt10745, a line with genotype Pur pu. S. Apisitwanich and W.K. Swiecicki....................	92
New Variety...................................................................................................................	92

Cover

Berdnikov et al (pp 37-39 this issue) conclude that the dominant gene for neoplastic pods, Np, may confer a measure of resistance to pea weevil (Bruchus pisorum L.), a common pest of garden pea. Pods with allele Np form pustule-like outgrowths under certain environmental conditions as a result of proliferation of the epidermal cells (Dodds and Matthews, 1966; Nuttal and Lyall, 1964). Similar outgrowths also form in response to Bruchus ovipositions (Vasilev, 1939). Berdnikov et al found that 6-8 days after oviposition, these outgrowths underwent necrosis and eventually fell away removing any unhatched eggs. However, the majority of the larvae managed to hatch earlier and penetrate the pods. Thus the strategy appeared not to be a very effective defence. Nevertheless, they found a high concentration of the Np allele among accessions from regions where pressure from the pest was high.

The cover photo (Berdnikov et al, Fig. 1) shows a purple pod of genotype Np/np with two bands of white, pustule-like outgrowths formed in response to application, through a glass capillary, of a 0.9% NaCl solution containing the homogenised remains of a Bruchus individual (black arrow). NaCl solution without the Bruchus homogenate (white arrow) failed to evoke this response. Pods lacking the Np allele did not respond to the Bruchus homogenate.