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The present study was conducted at orchard located at the side of Alexandria desert road (Cairo Alexandria, Km. 140), at Nubariya region during 2007 and 2008 seasons. The three experimented mango cultivars were Tommy Atkins, Kent and Keitt. The trees of the three studied cultivars are grafted on seeded rootstocks, attained nine years old and grown in sandy Soil. Trees of all mango cvs. were planted at 3x5 meter apart and subjected to the same horticultural practices. The objective of the present study is comparing inflorescences characteristics, pollen viability, germination and dimensions of Tommy Atkins, Kent and Keitt cultivars grown under Nubaria conditions. There were significant differences among studied cultivars in the length of panicles. Keitt cv. was found to have longest panicle compared to the other cvs. Meanwhile the lowest value was found in Tommy Atkins cv. The highest value of panicle width was found in Keitt cv. meanwhile, the lowest value was found in Tommy Atkins cv. Keitt cv. had the highest Number of branches per panicle followed by Tommy Atkins cv. meanwhile Kent cv. had the lowest values. The highest number of flowers per panicle was found in Tommy Atkins cv. in the two seasons, meanwhile, the lowest value was found in Kent cv. Tommy Atkins cv. had the largest percentage of perfect flower per panicle followed by Kent cv. meanwhile Keitt cv. had lowerst percentage in the two seasons. The highest percentage of male flowers per panicle was detected in Kent cv. in the first season and Tommy Atkins in the second season. The lowest sex ratio was shown in Tommy Atkins cv. inflorescence in both seasons. Followed in a decreasing order by Keitt and Kent inflorescence. Keitt cv. was found to have the highest percentage of malformed panicles per tree, followed by Kent cv. while, Tommy Atkins cv. had the lowest percentage. Keitt cv. showed the highest percentage of pollen grains viability followed by Tommy Atkins and Kent cvs. Kent cv. recorded the highest percentage of pollen germination meanwhile, Keitt and Tommy Atkins cvs. recorded the lowest percentage of pollen germination in first season and Keitt cv. in second season. Pollen diameter was lower in Tommy Atkins cv. compered to Keitt and Kent cvs.

[Abourayya, M.S; N.E. Kassim; M.H. El-Sheikh and A.M. Rakha. Comparative Study between Inflorescences Characteristics, Pollen Viability, Germination and Dimensions of Tommy Atkins, Kent and Keitt Mango Cultivars. Life Science Journal. 2011; 8(1):100-105] (ISSN: 1097-8135). http://www.lifesciencesite.com.