This investigation was conducted at the laboratories of Horticulture
Departments, Faculty of Agriculture to study the effect of different levels of
salinity (NaCl) in the rate and the percentage of seed germination of lettuce,
Lactuca sativa L. va
rieties: Shinshar and Kabous and to determine the seedling
response to these levels of salinity with relative to root length, the length of the
cold, fresh and dry weight of seedlings. NaCl was used at 0, 50, 100, 150 and
200 mM/l. Resulted showed that a gradual increase in salinity concentrations
caused a gradual decline in all indicators studied in both cultivars. However,
the plants of Kabous variety were less sensitive to the salinity and also higher
than in the indicators studied for seedlings (rate of germination and percent,
stems and roots length, fresh and dry weight of seedlings) under salt stress
conditions.
This current study was conducted on gardenia plant (Gardenia
jasminoides.L.) cv. ellis. which was micropropagated in vitro to study the effect
of some plant growth regulators on multiplication and rooting, for the aim of
developing a complete in v
itro microprpagation system of the studied cv.
Results demonstrated that, the best medium for in vitro micropropagation of
the studied cv. was MS medium supplemented with 1 mg/L BA + 0.1 mg/L IBA
with a multiplication rate of 5.33 new shoots, with average shoot height of 4.73
cm, and average leaf number of 4.36. These shoots were then transferred to a
rooting media containing a half-strength of the multiplication basal media with
NAA at a concentration of 1mg/L which resulted in highest rooting efficiency of
97% with average root number of 9.67, and average root length of 5.35 cm, and
average stem length of 9.80 cm, and average leaf number of 5.07. Increasing
NAA concentration in rooting media to 1.5 mg/L resulted in increasing root
length average to 6.28 cm with significant difference in comparison to the
previous treatment. Rooted Plantlets were acclimatized gradually in a growth
room conditions to ex vitro conditions with 85 % efficiency.
أجري هذه البحث في كلية الزراعة جامعة دمشق خلال الموسم الزراعي 2012-2013 بهدف دراسة تأثير بعض المعاملات في انبات بذور ونمو شتلات اللوز الكورشنسكي واللوز الشرقي
