Impact of pollen and intergenetic crosses between graminaceous (Poaceae) plants
1999
Meo, A.A. (Government Islamia Coll., Narowal (Pakistan). Dept. of Botany)
The pollen grains belonging to 17 different species of Gramineae were collected from Punjab University, New campus, Lahore during the spring/summer of 1984. The preservation and mounting media were farmer's fluid, cornoy's solution and molten jelly respectively. The size of pollen ranges from 17.50 plus minus 1.96 mew (width)/17.97 plus minus 1.67 mew (length) in Imperata cylindrica to 58.13 plus minus 1.96 mew (width)/64.49 plus minus 0.68 mew (length) in Triticum aestivum. The pollen of tetraploid and hexaploid species were larger in size as compared to those of diploids. The post pollen mitotic divisions do not occur at the site of production of pollen. Meiotic stages were observed in PMCs of some of the 17 plants. The results are discussed in relation to breeding programme leading to the formation of at least another "man made genus" Tritipoa or "Tritipogon".
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