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Evaluation of female gamete fertility through histological observation by the clearing procedure in Lilium cultivars.
Breeding Science 2018 June
Lilies ( Lilium spp.) are one of the most important floricultural crops. As most lily cultivars have originated from interspecific hybridization, they usually have complex genome composition and occasionally fail to develop normal gametes. Further improvement of lily cultivars by sexual crossing requires evaluation of gamete development and subsequent male and female fertility. Although male fertility is easily evaluated through microscopic observation after staining or by pollen culture for germination, evaluation of female fertility is difficult, because gametes develop inside an ovule within an ovary. Lilium species have the Fritillaria type of embryo sac, which, at maturity, consists of a haploid egg apparatus, including one haploid egg cell and two haploid synergids, two polar nuclei (one haploid nucleus and one triploid nucleus) and three triploid antipodal cells. Compared to the Polygonum type of embryo sac, composition of the embryo in the Fritillaria type of embryo sac is complex. We developed an efficient microscopic observation technique for ovules using the clearing procedure, which allowed us to categorize abnormal patterns of female gametes and to elucidate the frequency of abnormal female gamete development. The relationship among normal embryo sac, pollen stainability and seed formation in lily cultivars is discussed.
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