Abstract
Main conclusion
Characterization of anther and ovule developmental programs and expression analyses of stage-specific floral marker genes in Gossypium hirsutum allowed to build a comprehensive portrait of cotton flower development before fiber initiation.
Abstract
Gossypium hirsutum is the most important cotton species that is cultivated worldwide. Although cotton reproductive development is important for fiber production, since fiber is formed on the epidermis of mature ovules, cotton floral development remains poorly understood. Therefore, this work aims to characterize the cotton floral morphoanatomy by performing a detailed description of anther and ovule developmental programs and identifying stage-specific floral marker genes in G. hirsutum. Using light microscopy and scanning electron microscopy, we analyzed anther and ovule development during 11 stages of flower development. To better characterize the ovule development in cotton, we performed histochemical analyses to evaluate the accumulation of phenolic compounds, pectin, and sugar in ovule tissues. After identification of major hallmarks of floral development, three key stages were established in G. hirsutum floral development: in stage 1 (early—EF), sepal, petal, and stamen primordia were observed; in stage 2 (intermediate—IF), primordial ovules and anthers are present, and the differentiating archesporial cells were observed, marking the beginning of microsporogenesis; and in stage 6 (late—LF), flower buds presented initial anther tapetum degeneration and microspore were released from the tetrad, and nucellus and both inner and outer integuments are developing. We used transcriptome data of cotton EF, IF and LF stages to identify floral marker genes and evaluated their expression by real-time quantitative PCR (qPCR). Twelve marker genes were preferentially expressed in a stage-specific manner, including the putative homologs for AtLEAFY, AtAPETALA 3, AtAGAMOUS-LIKE 19 and AtMALE STERILITY 1, which are crucial for several aspects of reproductive development, such as flower organogenesis and anther and petal development. We also evaluated the expression profile of B-class MADS-box genes in G. hirsutum floral transcriptome (EF, IF, and LF). In addition, we performed a comparative analysis of developmental programs between Arabidopsis thaliana and G. hirsutum that considered major morphoanatomical and molecular processes of flower, anther, and ovule development. Our findings provide the first detailed analysis of cotton flower development.
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Abbreviations
- qPCR:
-
Real-time quantitative PCR
- EF:
-
Early flower bud stage
- IF:
-
Intermediate flower bud stage
- LF:
-
Late flower bud stage
- FB:
-
Flower bud
- SEM:
-
Scanning electron microscopy
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Acknowledgements
We are very grateful to Prof. E.W. Kitajima for access to the microscopy facilities (NAP/MEPA, ESALQ/USP, Brazil). We would also like to thank Dr. Osmundo Brilhante Oliveira-Neto (EMBRAPA-CENARGEN) for technical support. Our many thanks to Dr. Luis Willian Pacheco Arge for the valuable support with bioinformatic analyses. This research was supported by Conselho Nacional de desenvolvimento Científico e Tecnológico (CNPq) (308832/2017-5), Instituto Nacional de Ciência e Tecnologia (INCT Biotec Seca-Pragas; 465480/2014-4), and Fundação de Amparo à Pesquisa do Rio de Janeiro (FAPERJ CNE; E-26/202.631/2019). This study is part of Stéfanie Menezes de Moura’s Ph.D. thesis in plant biotechnology (Pós-graduação em Biotecnologia Vegetal) at Universidade Federal do Rio de Janeiro—UFRJ. SMM was supported partly by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Bolsa de Doutorado; and Bolsa de Doutorado Nota 10 from FAPERJ (E-26/200.251/2017). APM acknowledges CNPq for Research Fellowships (Process no 312602/2019-7).
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de Moura, S.M., Rossi, M.L., Artico, S. et al. Characterization of floral morphoanatomy and identification of marker genes preferentially expressed during specific stages of cotton flower development. Planta 252, 71 (2020). https://doi.org/10.1007/s00425-020-03477-0
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DOI: https://doi.org/10.1007/s00425-020-03477-0