Studies of vegetative propagation of the lychee (Litchi chinensis ...

210 W. S. Abutiate & N. Y. Nakasone (1972) Ghana Jnl agric. Sci. S, 201-211
Sitton (1929) and Swarbrick (1926). In this study, Buck, G. J. C1?53).The histological development o~the
the secondary cambial derivatives were observed to bud graft union In roses. Proc. Am. Soc. hort. Set. 62,
'b call fi . b th '" 497-502.
contn ue to us ormatIOn ut e partICIpatIOn
of the ray cells in the healing process could not be
clearly established. Crafts (1934) and Bradford &
Sitton (1929) further observed that the vascular
cambium also contributed cells to the graft union
but in this study there was no conclusive evidence
to establish the cambium as directly contributing to
callus formation.
As observed also by Mendel (1936) and Saas
(1933) the pith did not contribute callus in the
healing process of the lychee grafts. The results
of the side-wedge grafts also corroborated the
findings of Mendel (1936) that both the stock and
scion may contribute callus in the healing process.
From the growth behaviour of the lychee, Venning
(1949) postulated that successful unions may
depend upon the chances of any two active cambial
areas being in juxtaposition. Since there are no
external indicators to cambial activity in this stem,
success of union will undoubtedly depend upon
the chances of two active cambial areas being in
contact.
The results of this study have indicated that
successful grafting may depend upon the interplay
between a number of factors including cambial
activity in the two symbionts, the level of carbohydrates
in the stems and cultivar characteristics.
Both rooting of suitable stem cuttings with the
aid of hormones and side-grafting of old stocks
using prepared scions may be used only to a
limited extent. For large-scale propagation, however,
young seedlings are preferred since a higher
percentage of successful unions may be obtained.
Recent work by Kadman & Slor in Israel has
clearly established this fact.
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