Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： In order to clarify the morphology of floral organs and the development status of male and female gametophytes at different development stages of Bambusa tuldoides in wild, and to summarize their abortion types, the appearance morphology of each part of floral organs and the development process of male and female gametophytes of B. tuldoides were observed by means of anatomy and sectioning, and the reasons for the low seed setting rate were also analyzed. The results were as follow: (1) The spikelets of B. tuldoides were of infinite inflorescences. The florets in the lower part of the spikelets developed first, and there were latent buds developed at the base, which had the characteristics of definite inflorescence. The petioles of spikelets were undeveloped, and the spikelets developed in cluster at each node of the floral branch. (2) Each floret had 1 palea, 1 lemma, 6 stamens, 3 lodicules and 1 pistil. The lodicule was transparent and had well-developed cilia on the edge. The ovary had prismatic protrusions and the upper part of which had villi, and was unilocular and lateral membranous with a anatropous ovule. The stigmas were three-lobed and feathery. (3) The anther of B. tuldoides had four sporangia, and the anther wall was composed of four layers, epidermis, endothecium, middle layer and tapetum. The tapetum was glandular, and degenerated completely after maturity. The meiosis was successive and the microspore tetrads were bilaterally. The mature pollen grains were three-celled（. 4）Several abortion types were found in pistils and stamens, which might be the main reason for the low seed setting rate of B. tuldoides. All the above results indicate that the morphological structure of B. tuldoides floral organs is normal, while the female and male gametophytes developed abnormally, which cause the low seed setting rate.
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