This study was carried out at experimental farm, faculty of Agriculture Moshtohor during 2002 /2003 and2003/ 2004 seasons. Seeds of papaya Solo cultivar were soaked for 12 hours in :
1- Tap water as control treatment.
2- Sodium benzoate at 0.1 and 0.2 g./L.
3- Citric acid at 1.0 and 2.0 g./L.
4- Glucose at 10 and 20 g./L.
5- Yeast extract at 250 and 500 ml./ L
Also, plants were sprayed with same solutions twice: after complete germination and after transplanted into orchard. Germination parameters, vegetative growth, flowering and fruiting were studied. Anatomical studies of flowers and fruits were conducted. Results obtained could be summarized as following:
The treatments with yeast extract and citric acid gave the highest values of germination parameters(germination percentage, germination rate and germination value).The vigorous vegetative growth was obtained with treatment of yeast extract followed by citric acid. The treatments with yeast extract or glucose improved leaves photosynthesis pigments content. The most important results of this study was that number of branches per plant, number of female flowers per plant and pollen grains fertility significantly increased and reduced time required attain blooming in case of yeast extract treatments. As for yield and physical and chemical fruit quality, treatments of yeast extract followed by glucose gave highest values for different quality characteristics.
As for the anatomical, several alternations were existed with different applied treatments.. All treatments gave the highest parameters of petiole flower (cross & longitudinal sections) and fruit anatomy compared with the control the best treatments was yeast extract followed by citric acid .
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