Control of Sexual Development in Gametophytes of Ceratopteris richardii: Antheridiogen and Abscisic Acid

1991 ◽  
Vol 152 (2) ◽  
pp. 148-153 ◽  
Author(s):  
Thomas R. Warne ◽  
Leslie G. Hickok
Keyword(s):  
Abscisic Acid ◽  
Sexual Development ◽  
Ceratopteris Richardii

Antheridiogen and abscisic acid affect conversion and ANI1 expression in Ceratopteris richardii gametophytes

Botany ◽  
2015 ◽  
Vol 93 (2) ◽  
pp. 109-116 ◽  
Author(s):  
Michael T. Ganger ◽  
Julia A. Girouard ◽  
Hannah M. Smith ◽  
Beth A. Bahny ◽  
Sarah J. Ewing
Keyword(s):  
Abscisic Acid ◽  
Ceratopteris Richardii ◽  
Induced Expression ◽  
Expression Levels ◽  
Distinct Role

The development of male Ceratopteris richardii Brongn. gametophytes (induction) is well studied. Males develop in response to hermaphrodite-produced antheridiogen, which coincides with induced expression of ANI1 (antheridiogen-induced 1). Induction is blocked by exogenous abscisic acid (ABA). Conversion of male gametophytes to hermaphrodites occurs when males are removed from antheridiogen and is a less understood process. In this study, males were exposed to ABA at 0 μmol·L−1, 1 μmol·L−1, 10 μmol·L−1, 100 μmol·L−1, and 300 μmol·L−1 and monitored for conversion. RT-qPCR methodology was developed to examine ANI1 expression levels in gametophytes outside of induction. Conversion of male gametophytes occurred more often and more quickly in media lacking ABA, and at lower ABA concentrations than at higher concentrations. ANI1 expression dropped significantly in males transferred to media lacking antheridiogen, but remained high in males remaining in the presence of antheridiogen and in those transferred to ABA. ANI1 expression was higher in 24 day old hermaphrodites relative to 24 day old males and at comparable expression levels to 6 day old gametophytes. These results suggest ABA serves a distinct role in conversion compared with induction, and ANI1 is expressed throughout the male’s lifespan and in older hermaphrodites.

Parenting and Adolescents’ Sexual Development in Western Societies

2011 ◽  
Vol 16 (1) ◽  
pp. 21-31 ◽  
Author(s):  
Hanneke de Graaf ◽  
Ine Vanwesenbeeck ◽  
Liesbeth Woertman ◽  
Wim Meeus
Keyword(s):  
Sexual Behavior ◽  
Parenting Styles ◽  
Sexual Development ◽  
Parental Support ◽  
Empirical Studies ◽  
Sexual Practices ◽  
Psychosexual Development ◽  
First Sexual Intercourse ◽  
Parenting Influences ◽  
Reciprocal Associations

This review examines associations between parenting styles and the psychosexual development of adolescents. Methods and results of empirical studies of associations between parental support, control, and knowledge and the sexual behavior and sexual health of adolescents are described and evaluated. The results show that, in general, higher scores on support, control, and knowledge relate to a delay of first sexual intercourse, safer sexual practices, and higher sexual competence. Despite the vast amount of literature on this subject, the majority of these studies focus on single dimensions of parenting and unidirectional parenting influences. This review generates hypotheses regarding interactions of different parenting styles and reciprocal associations between parents and their children. There is a need for more dynamic, dialectical studies of parenting, and children’s sexual development.

Differential accumulation of methyl jasmonate-induced mRNAs in response to abscisic acid and desiccation in barley (Hordeum vulgare)

1992 ◽  
Vol 86 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Steffen Reinbothe ◽  
Christiane Reinbothe ◽  
Jorg Lehmann ◽  
Benno Parthier
Keyword(s):  
Abscisic Acid ◽  
Hordeum Vulgare ◽  
Methyl Jasmonate

Antitranspirant action of abscisic acid and ten synthetic analogs in black spruce

1990 ◽  
Vol 80 (3) ◽  
pp. 365-370 ◽  
Author(s):  
Terence J. Blake ◽  
Weixing Tan ◽  
Suzanne R. Abrams
Keyword(s):  
Abscisic Acid ◽  
Black Spruce ◽  
Synthetic Analogs

Signalling gates in abscisic acid-mediated control of guard cell ion channels

1997 ◽  
Vol 100 (3) ◽  
pp. 481-490 ◽  
Author(s):  
Michael R. Blatt ◽  
Alexander Grabov
Keyword(s):  
Abscisic Acid ◽  
Ion Channels ◽  
Guard Cell

Abscisic acid levels of individual leaf cells

1990 ◽  
Vol 80 (1) ◽  
pp. 51-54 ◽  
Author(s):  
Enno Brinckmann ◽  
Wolfram Hartung ◽  
Margarete Wartinger
Keyword(s):  
Abscisic Acid ◽  
Individual Leaf
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