Anatomical observations on the male and female floral buds development of Populus deltoides in Nanjing area

LU Jing, CHEN Wenwen, WU Huaitong, CHEN Yingnan

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (1) : 197-202.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (1) : 197-202. DOI: 10.12302/j.issn.1000-2006.202011019

Anatomical observations on the male and female floral buds development of Populus deltoides in Nanjing area

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Abstract

【Objective】 Characterizing floral bud development in perennial woody plants is critical for revealing the molecular regulatory mechanisms of flowering in trees. 【Method】 In this study, morphological changes in floral buds were investigated in male and female Populus deltoides. Anatomical structures were observed in paraffin sections. 【Result】 In Nanjing area, floral buds begin to appear on the floral branches from late May to early June each year. The developmental process can be divided into five stages: bract differentiation (before mid-June), floret primordium initiation (from mid-June to mid-July), gynoecium/androecium differentiation (from mid-July to November), dormancy (from December to January of the following year), and male/female gametophyte development (from February to March). Finally, the differentiation of unisexual flowers occurred in early spring. 【Conclusion】 Both male and female flowers of P. deltoides belong to the type Ⅱ unisexual flower, which exhibits no rudiments of the opposite sex. During the entire developmental period, both the bud scales of male and female flowers remained green and rigid, though the male floral buds were larger and plumper than those of females. The growth curve of floral buds exhibited a sigmoid shape. The results obtained in this study provide a necessary foundation for exploring the molecular mechanisms underlying floral organogenesis and sex determination in poplar.

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Populus deltoides / dioecy / floral bud development / anatomical observation

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LU Jing , CHEN Wenwen , WU Huaitong , et al. Anatomical observations on the male and female floral buds development of Populus deltoides in Nanjing area[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2022, 46(1): 197-202 https://doi.org/10.12302/j.issn.1000-2006.202011019

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