الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
A field trial was conducted during three successive seasons
(2010-2011, 2011-2012 and 2012-2013) to study the effect of
Okinawa and Nemaguard (P. persica ) rootstocks on vegetative
growth, leaf mineral content, flowering and fruiting of ”Sun Wright”
nectarine and two peach cultivars namely ”Flordaprince and Early
swelling”. The second experiment applied on two plum cultivars
”Celebration and Pioneer” grafted on the previous rootstocks besides
”Marianna rootstock (P. cerasifera x P. munsoniana). The transplants
were grown in a sandy soil under drip irrigation system. In peach and
nectarine experiment after three growing seasons, the obtained data
showed that trees grafted on Nemaguard rootstock had a significant
larger tree size and trunk cross sectional area, while no significant
differences in tree height, shoot length, number of leaves per shoot
and trunk circumference. All cultivars trees on the two rootstocks
showed high compatibility among all grown seasons. No differences
were observed in leaf mineral content between the two rootstocks.
Okinawa rootstock induced an early vegetative bud opening of Early
swelling cv., whereas Sun Wright and Flordaprince weren’t influenced
by both rootstocks. The flowering measurements of all cultivars under
the study weren’t influenced significantly by both rootstocks. Also,
yield, some chemical and physical properties of fruits of all cultivars
were not influenced by both rootstocks.
On the other hand the plum experiment showed that Marianna
rootstock increased significantly tree height, shoot length, average
number of leaves per shoot, leaf area and had the most homogenous
compatibility, while Nemaguard significantly increased number of
shoots and TCSA. Both Okinawa and Nemaguard rootstocks
presented non homogenous graft compatibility with Pioneer cultivar.
No differences were observed in leaf mineral concentration except
with iron which had a higher significant concentration with Okinawa
rootstock. Vegetative and flower bud break of both plum cultivars
budded on Okinawa and Nemaguard were earlier than Marianna.
Pioneer was earlier than Celebration in starting and ending flowering.
Tress budded on Okinawa had the highest significant flower buds
percentage. No yield harvested from the two cultivars may be due to
unsuitable environmental conditions during flowering and fruit set or
it needs a compatible pollinizer, although literature reported that
Pioneer cv. is self-fertile. Additional researches are needed to study
the flowering and fruiting of these cultivars under the conditions of
the experiment location. The anatomy study of the graft union
revealed that Pioneer budded on Okinawa and Marianna rootstock and
on the interstock are compatible showed a complete union between the
rootstock and the scion in the early stages after budding with observed
that xylem vessels are extended in horizontal direction.
Key words: Cultivars, Flowering, Growth, Leaf mineral content,
Prunus, Rootstock, Yield and Quality.