70
RESEARCH REPORTS
PNL Volume 12
1980
CHANGE IN PROPORTION OF PEA FOLIAGE TYPES AFTER ONE SEASON OF GROWTH AS A
MIXTURE
Wehner, T. C. and
E. T. Gritton
North Carolina State University, Raleigh, NC USA
University of Wisconsin, Madison, WI USA
Some mixtures of pea foliage types are superior to the normal type for
a number of important agronomic characteristics (Wehner, T.C. PhD thesis,
University of Wisconsin, Madison, WI. 83 p. 1979). Our objective in this
study was to determine whether these mixtures of foliage types changed
significantly from the original 1:1 composition after one season of growth.
Four foliage types near-isogenic for the genes af, t1, and st were
developed in each of seven genetic backgrounds. The four foliage types were
afaf T1T1 StSt (afila) where the leaflets are replaced by extra tendrils,
AfAf tltl StSt ( acacia) where the tendrils are replaced by extra leaflets,
AfAf T1T1 stst (reduced stipule) where the stipules are reduced to small
strap-shaped structures, and AfAf tltlstst where there are both extra leaflets
and reduced stipules. These foliage types will be referred to using only
the gene(s) in homozygous recessive condition—af, tl, st, and sttl. The
seven lines used were 'Alsweet', 'Sprite', 'New Season', 'New Line Early
Perfection' (NLEP), 'Dark Skin Perfection' (DSP), and two experimentals,
Line-1 and Line-2, from G. A. Marx, Geneva, New York. Three mixtures were
tested—af+st, af+sttl, and tl+st—and were produced by mixing equal
weights of seed-of the two foliage types. Plots were grown at Arlington,
Wisconsin, in 1977 as part of a larger experiment. Dry seed harvested from
each mixture was planted in 1978 in low density rows, and each foliage type
was counted. Data were compared to the 1:1 expected ratio using Chi-square
analysis.
Of the three foliage type mixtures, only af+sttl remained unchanged
from the original 1:1 composition (Table 1.) The af foliage type increased
to 53.6% of the af+st mixture, and the tl type increased to 62.9% [63.1?-Ed.]
of the tl+st mixture. The exceptions to this were that the foliage type
mixtures in the cultivars Sprite and New Season remained unchanged in
composition after one season of growth. We concluded that it would be
necessary to remake the foliage type mixtures each year for the af+st and
tl+st mixtures but not for af+sttl.
PNL Volume 12 1980
RESEARCH REPORTS 71
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