Scanning electron microscopy (SEM) and light microscopy (LM) studies were made on pollen samples of selected cultivars of Vitis labruscana Bailey and V. vinifera . Pollen differed in size, shape, and exine characteristics. The majority of cultivars had tricolporate (3-furrowed) pollen, except “abnormal” types which lacked the furrows (colpi). Based on exine and furrow characteristics, shape, and polar axis/equatorial diameter (P/E) ratios of pollen, cultivars were divided into 3 shape groups. Cultivars with pollen lacking furrows were grouped as “abnormal”. Pollen shape and P/E ratios were better parameters to aid in grape ampelography than exine patterns and furrow characteristics.
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M. Ahmedullah (1983) studied this question.