Pollen morphology and plant taxonomy pdf
Pollen morphology of certain species of the family Lamiaceae in Saudi ArabiaPollen morphology and its taxonomic significance in the genus Bomarea Mirb. Alstroemeriaceae - II. Subgenus Bomarea. Pollen morphology of 52 species out of c. The studied species of Bomarea were stenopalynous, characterized by large, oblate, monosulcate monads with reticulate exine sculpture in most species. Wide variation was observed in quantitative palynological features. The studied taxa were divided into four major groups based on exine ornamentation observed under SEM: microreticulate, reticulate, coarsely rugulate, and psilate-perforate.
Pollen Grain Formation-Sexual Reproduction In Plants-Video 2
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A palynological survey, including LM, SEM and TEM is presented for eight genera, nine species and 76 samples of the Monotropoideae which is composed of 10 genera and 13 species. On the basis of the aperture number and shape, the following six pollen types are recognized: 1 3-colp oroid ate— Allotropa , 2 2-colpor oid ate— Monotropsis and Hemitomes , 3 4-colpor oid ate— Pterospora, Sarcodes and Pleuricospora , 4 2- and 3-colpor oid ate— Monotropa hypopitys , 5 3-colporate and-porate — Monotropa uniflora , 6 3- to 4- porate— Monotropastrum humile. Relationships among taxa within the Monotropoideae are illustrated on the palynological characters including the aperture type, exine sculpture and structure. Both pollen grains with two and four apertures have evolved independently from pollen grains with three apertures, according to the infraspecific variation of aperture numbers and the usual occurrence of three-aperturate pollen grains in the Ericaceae. A reduced sexine in Monotropastrum humile appears to be a specialized pollen character.
Scientific Research An Academic Publisher. Erdtman, G. Almqvist and Wiksell, Stockholm, p. Boraginaceae Juss. Heliotropiaceae in south west of Saudi Arabia has been studied; seven species of H.