Irregular adaxial–abaxial polarity rearrangement contributes to the monosymmetric-to-asymmetric transformation of Canna indica stamen

Tian, Xueyi; Li, Xiaorong; Yu, Qianxia; Zhao, Haichan; Song, Jun; Liao, Jingping

doi:10.1093/aobpla/plaa051

Cited by 4 publications

(3 citation statements)

References 47 publications

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“…By contrast, PHB3 expression shifts from the adaxial side to the intermediate domain of the adaxial and abaxial anther lobes [ 38 ]. Similarly, symmetry transition in Canna indica anthers is reported to be correlated with the rearrangement of CiPHB (adaxial gene) and CiFIL (abaxial gene) [ 39 ]. In Arabidopsis flowers, PHB expression initially occurs on the adaxial side but later becomes restricted to the two lateral domains of anther primordia [ 40 ], which is very similar to what has been found in rice anthers [ 38 ].…”

Section: Stamen Morphogenesismentioning

confidence: 99%

Male Germ Cell Specification in Plants

Chen,

Wang,

Liu

et al. 2024

IJMS

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Germ cells (GCs) serve as indispensable carriers in both animals and plants, ensuring genetic continuity across generations. While it is generally acknowledged that the timing of germline segregation differs significantly between animals and plants, ongoing debates persist as new evidence continues to emerge. In this review, we delve into studies focusing on male germ cell specifications in plants, and we summarize the core gene regulatory circuits in germ cell specification, which show remarkable parallels to those governing meristem homeostasis. The similarity in germline establishment between animals and plants is also discussed.

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Section: Stamen Morphogenesismentioning

confidence: 99%

Male Germ Cell Specification in Plants

Chen,

Wang,

Liu

et al. 2024

IJMS

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“…In the outer androecial whorl of most species, the lateral staminode develops into a laminar (petaloid) floral organ, whereas the other two staminodes abort soon after initiation [ 5 , 6 ]. The inner whorl consists of a curved staminode often with colorful markings called the ‘labellum’, a petaloid staminode, and a single fertile stamen which is only ½ fertile, bearing a single theca with an expanded petaloid appendage [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. The half-fertile stamen is thought to be associated with secondary pollen presentation [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Correlation between Inflorescence Architecture and Floral Asymmetry—Evidence from Aberrant Flowers in Canna L. (Cannaceae)

Zhao

et al. 2022

Plants

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Floral symmetry studies often focus on the development of monosymmetric and polysymmetric flowers, whereas asymmetric flowers and their position and function within the inflorescence structure are largely neglected. Cannaceae is one of the few families that possesses truly asymmetric flowers, serving as a model to study the characters and mechanisms involved in the development of floral asymmetry and its context within the developing and mature inflorescence. In this study, inflorescence structure and floral morphology of normal asymmetric flowers and 16 aberrant flower collections from Canna indica L. and C. glauca L. were photographed, analyzed, and compared with attention to stamen petaloidy, floral symmetry, and inflorescence branching patterns anterior and posterior to the aberrant flower. In comparison with normal flowers, the aberrant flowers are arranged into abnormal partial florescences, and vary in floral symmetry, orientation, and degree of androecial petaloidy. The appendage of the fertile stamen is universally located distal from the higher order bract, indicating an underlying influence of inflorescence architecture. A synthetic model is proposed to explain the relationship between floral symmetry and inflorescence structure. Data from the observation of aberrant phenotypes strongly support the hypothesis that irregular petaloidy of the stamens is correlated with an asymmetric morphogenetic field within the inflorescence that contributes to the overall floral asymmetry in Canna flowers.

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“…Generally, floral symmetry is controlled by the number, shape and size of the floral organs. However, in some species, such as Canna indica , an ornamental plant of the Zingiberales, floral symmetry is firmly associated with organ identity (Rudall & Bateman 2004; Tian et al 2018; Tian et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Asymmetric expression patterns of B‐ and C‐class MADS‐box genes correspond to the asymmetrically specified androecial identities of Canna indica

Tian

et al. 2021

Plant Biol J

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Canna indica is a common ornamental plant with asymmetric flowers having colourful petaloid staminodes. The only fertile stamen comprises a one‐theca anther and a petaloid appendage and represents the lowest stamen number in the order Zingiberales. The molecular mechanism for the asymmetric androecial petaloidy remains poorly understood. Here, we studied the identity specification in Canna stamen. We observed four types of abnormal flower in terms of androecium identity transformation and analysed the corresponding floral symmetry changes. We further tested the expression patterns of B‐ and C‐class MADS‐box genes using in situ hybridization in normal Canna stamen. Homeotic conversions in the androecium were accompanied by floral symmetry changes, and the asymmetric stamen is key in contributing to the floral asymmetry. Both B‐ and C‐class genes exhibited higher expression levels in the anther primordium than in other androecial parts. This asymmetric expression pattern precisely corresponded to the asymmetric identities of the Canna androecium. We identified C. indica as a model species for studying androecial organ identity and floral symmetry synthetically in Zingiberales. We hypothesized that homeotic genes specify floral organ identity in a putative dose‐dependent manner. The results add to the current understanding of organ identity‐related floral symmetry.

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Irregular adaxial–abaxial polarity rearrangement contributes to the monosymmetric-to-asymmetric transformation of Canna indica stamen

Cited by 4 publications

References 47 publications

Male Germ Cell Specification in Plants

Male Germ Cell Specification in Plants

Correlation between Inflorescence Architecture and Floral Asymmetry—Evidence from Aberrant Flowers in Canna L. (Cannaceae)

Asymmetric expression patterns of B‐ and C‐class MADS‐box genes correspond to the asymmetrically specified androecial identities of Canna indica

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