The genus Arschis includes a large number of apdu including
A. hypoped, the groundnut. The species are grouped into men wctions.
A. hypog@ad. a tetraploid, can be crowed only with the sped08
within its own ssction, Amchis, even though most of them arr diploids.
From the diploid species resistances are being trms?md to
A. hypogma. Investigations on barriers to hybridization betwoen sections
have been initiated at ICRISAT. Soms techniques have bean dmloped
to break the barriers.
After incompatible poll~nations betw*en A. h-1) or A.
monticols and species in section Rhiromatosw. fluoremncrr
microscopic investigation reveals that some inhibition of pollen tubs
growth occurs in the style. However, pollen tubes can be soen at the
base of the pistils. In very few instances pegs do develop but do not
elongate further than 1 cm and degenerate before they can penetrate
the mil and form pods.
Applications of growth hormones to the bases of incompatibly
pollinated flowers just afm pollination significantly in~asedth e
number of peg6 produced from about 10 percent (untreated) to mom
than 60 percent (hormone treated) of pollinations. Hormones were
clp~li~sdin gly or in combination. or in sequencr. GA3 induced moat
pep. but thou died bdorr aoda weto formed. A wbowuent treatment
with kinetin maintained peg growth to a stage at which embryo$ could
k disuc?ed from immrturo pods and succe#fuliy cubrod in virt
