Corolla and androecium development in someEudesmia eucalypts (Myrtaceae)

1989 ◽  
Vol 165 (3-4) ◽  
pp. 239-254 ◽  
Author(s):  
Andrew N. Drinnan ◽  
Pauline Y. Ladiges
Keyword(s):  
Androecium Development

scholarly journals Silencing of the Ortholog of DEFECTIVE IN ANTHER DEHISCENCE 1 Gene in the Woody Perennial Jatropha curcas Alters Flower and Fruit Development

2020 ◽  
Vol 21 (23) ◽  
pp. 8923
Author(s):  
Chuan-Jia Xu ◽  
Mei-Li Zhao ◽  
Mao-Sheng Chen ◽  
Zeng-Fu Xu
Keyword(s):  
Jatropha Curcas ◽  
Floral Development ◽  
Initial Step ◽  
Biosynthesis Pathway ◽  
Anther Dehiscence ◽  
Phospholipase A1 ◽  
Woody Perennial ◽  
Flower And Fruit Development ◽  
Male Flowers ◽  
Androecium Development

DEFECTIVE IN ANTHER DEHISCENCE 1 (DAD1), a phospholipase A1, utilizes galactolipids (18:3) to generate α-linolenic acid (ALA) in the initial step of jasmonic acid (JA) biosynthesis in Arabidopsis thaliana. In this study, we isolated the JcDAD1 gene, an ortholog of Arabidopsis DAD1 in Jatropha curcas, and found that it is mainly expressed in the stems, roots, and male flowers of Jatropha. JcDAD1-RNAi transgenic plants with low endogenous jasmonate levels in inflorescences exhibited more and larger flowers, as well as a few abortive female flowers, although anther and pollen development were normal. In addition, fruit number was increased and the seed size, weight, and oil contents were reduced in the transgenic Jatropha plants. These results indicate that JcDAD1 regulates the development of flowers and fruits through the JA biosynthesis pathway, but does not alter androecium development in Jatropha. These findings strengthen our understanding of the roles of JA and DAD1 in the regulation of floral development in woody perennial plants.

Androecium development in the bromeliad Dyckia pseudococcinea L.B.Sm. (Pitcairnioideae-Bromeliaceae), an endangered species endemic to Brazil: implications for conservation

Flora ◽  
2012 ◽  
Vol 207 (8) ◽  
pp. 622-627 ◽  
Author(s):  
Simone Petrucci Mendes ◽  
Cecília G. Costa ◽  
Karen L.G. De Toni
Keyword(s):  
Endangered Species ◽  
Androecium Development

scholarly journals Evidences for a role of two Y-specific genes in sex determination in Populus deltoides

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Liangjiao Xue ◽  
Huaitong Wu ◽  
Yingnan Chen ◽  
Xiaoping Li ◽  
Jing Hou ◽  
...  
Keyword(s):  
Transposable Element ◽  
Common Ancestor ◽  
Populus Deltoides ◽  
Response Regulator ◽  
The Other ◽  
Regulator Gene ◽  
Non Coding Rnas ◽  
Androecium Development ◽  
Almost All

AbstractAlmost all plants in the genus Populus are dioecious (i.e. trees are either male or female), but it is unknown whether dioecy evolved in a common ancestor or independently in different subgenera. Here, we sequence the small peritelomeric X- and Y-linked regions of P. deltoides chromosome XIX. Two genes are present only in the Y-linked region. One is a duplication of a non-Y-linked, female-specifically expressed response regulator, which produces siRNAs that block this gene’s expression, repressing femaleness. The other is an LTR/Gypsy transposable element family member, which generates long non-coding RNAs. Overexpression of this gene in A. thaliana promotes androecium development. We also find both genes in the sex-determining region of P. simonii, a different poplar subgenus, which suggests that they are both stable components of poplar sex-determining systems. By contrast, only the duplicated response regulator gene is present in the sex-linked regions of P. davidiana and P. tremula. Therefore, findings in our study suggest dioecy may have evolved independently in different poplar subgenera.

Androecium development and staminode diversity of Cocculus orbiculatus (Menispermaceae)

Flora ◽  
2020 ◽  
Vol 265 ◽  
pp. 151573
Author(s):  
Hui-Yan Zhang ◽  
Xiao-Ling Yan ◽  
Shan Su ◽  
Yu-Qu Zhang ◽  
Yi Ren ◽  
...  
Keyword(s):  
Androecium Development

Two antagonistic effect genes mediate separation of sexes in a fully dioecious plant

2020 ◽  
Author(s):  
Liangjiao Xue ◽  
Huaitong Wu ◽  
Yingnan Chen ◽  
Xiaoping Li ◽  
Jing Hou ◽  
...  
Keyword(s):  
Sex Chromosome ◽  
Early Stage ◽  
Antagonistic Effect ◽  
Dioecious Plant ◽  
Rna Transcripts ◽  
Non Coding Rna ◽  
Small X ◽  
Androecium Development ◽  
Evolution Of Dioecy ◽  
Long Non Coding Rna

AbstractPlant sex determining systems and sex chromosomes are often evolutionarily young. Here, we present the early stage of sex chromosome in a fully dioecious plant, P. deltoides, by determining separate sequences of the physically small X- and Y-linked regions. Intriguingly, two Y genes are absent from the X counterpart. One gene represses female structures by producing siRNAs that block expression of a gene necessary for development of female structures, via RNA-directed DNA methylation and siRNA-guided mRNA cleavage. The other gene generates long non-coding RNA transcripts that, in males, soak up miRNAs that specifically inhibit androecium development. Transformation experiments in Arabidopsis thaliana show that the two genes affect gynoecium and androecium development independently and antagonistically. Sex determination in the poplar therefore has the properties proposed for the first steps in the evolution of dioecy in flowering plants, with two genes whose joint effects favor close linkage, as is observed in poplar.

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