Sex Determination in Flowering Plants

Dellaporta, Stephen L.; Calderon-Urrea, Alejandro

doi:10.2307/3869777

Cited by 86 publications

(104 citation statements)

References 41 publications

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“…Dellaporta and Calderon Urrea (1993) conclude that in Cannabis, sex determination must occur very early in the developing flowers. In Mercurialis a similar situation was found, the unisexual flowers being devoid of rudiments of organs of the opposite sex Durand 1991, cited from Dellaporta andCalderon-Urrea 1993).…”

Section: Introductionmentioning

confidence: 94%

“…So far it has not been known which factors are responsible for sex expression in hemp and at which stages the expression of one sex is suppressed or promoted. Mohan Ram andNath (1964, cited from Dellaporta andCalderon-Urrea 1993) found that in C. sativa, male and female flowers differ radically in morphology and size, and show no evidence of the missing sex. Dellaporta and Calderon Urrea (1993) conclude that in Cannabis, sex determination must occur very early in the developing flowers.…”

Section: Introductionmentioning

confidence: 97%

“…Mohan Ram andNath (1964, cited from Dellaporta andCalderon-Urrea 1993) found that in C. sativa, male and female flowers differ radically in morphology and size, and show no evidence of the missing sex. Dellaporta and Calderon Urrea (1993) conclude that in Cannabis, sex determination must occur very early in the developing flowers. In Mercurialis a similar situation was found, the unisexual flowers being devoid of rudiments of organs of the opposite sex Durand 1991, cited from Dellaporta andCalderon-Urrea 1993).…”

Section: Introductionmentioning

confidence: 97%

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Sex-linked AFLP markers indicate a pseudoautosomal region in hemp (Cannabis sativa L.)

et al. 2003

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In dioecious plants of hemp ( Cannabis sativa L.), males are regarded as heterogametic XY and females as homogametic XX, although it is difficult to discriminate the X cytologically from the Y. The Y chromosome is somewhat larger than the X. Our aim was to analyse AFLP markers on X and Y, and to use them to gain some insight into the structure of the sex chromosomes. Markers located on the sex chromosomes can be grouped into different classes, depending on the presence or absence of a fragment on the X and/or the Y. They are detected by separately analysing male and female progenies of a single cross. Five markers were found to be located on both chromosomes. A few recombinants were observed for marker pairs of this class in the male progenies. Two completely linked markers located on the Y chromosome in the male parent show a recombination rate of r = 0.25 with sex. Recombination must have occurred between the sex chromosomes in the male parent. The recombination analysis led to the conclusion that there is a pseudoautosomal region (PAR) on the sex chromosomes, allowing recombination between the X and the Y chromosome. The other regions of the sex chromosomes show only a few recombination events, for the Y as well as for the X. These results are discussed in comparison to other dioecious plants.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Sex-linked AFLP markers indicate a pseudoautosomal region in hemp (Cannabis sativa L.)

et al. 2003

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“…Another example of PCD in flower development is elimination of sex organ in unisexual flowers. For instance, in maize stamen primordia abort early in development of female flowers [12].Many examples of PCD during normal development of plants described above strongly suggest that plants employ PCD to eliminate some cells or generate specialized cells such as TEs in development. However, at the moment little is known on molecular mechanisms regulating the PCD in plant development.…”

mentioning

confidence: 99%

“…Another example of PCD in flower development is elimination of sex organ in unisexual flowers. For instance, in maize stamen primordia abort early in development of female flowers [12].…”

mentioning

confidence: 99%

Programmed Cell Death in Plants.

Shimamoto

Takahashi

Henmi

et al. 1999

Plant Biotechnology

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There is increasing evidence for occurrence of programmed cell death (PCD) in plant development, plant-microbe interaction and cells under a variety of stresses. Recent studies on PCD in plants indicate that various features of apoptosis in mammals are shared with plant PCD: there is evidence for DNA fragmentation, oligonucleosomal DNA laddering, morphological changes in plant cells. These studies suggest that PCD plays an important role in the life of plants as in animals. Despite the wide occurrence of PCD in plants, signaling and components of the machinery for PCD are largely unknown. We recently identified the Rac family of the small GTP-binding protein as a key regulator of PCD in plants. Also, the analysis of lesion mimic mutants of rice indicates that some mutants have biochemical alterations in early steps of signaling in disease resistance. The major challenge in the study of plant PCD in the near future is the identification of signaling molecules and components of machinery involved in plant PCD. This will enable us to better understand this important cellular process of plants.ment of roots. Aerenchyma cells are formed by PCD to produce internal air spaces to facilitate efficient oxygen supply in the soil [8] . Another form of PCD that occurs in roots is found in root cap cells [9]. Root cap cells are produced from the meristem and sloughed from the root while new cells are continuously generated.Leaf: Leaf senescence is a well known example of cell death in plant development [10]. When old leaves senesce active transcription of new genes occurs, suggesting that senescence is an active process and some genes encode hydrolase such as proteases [10]. Although morphological changes of cells and DNA cleavage typically observed in cells undergoing PCD have not been clearly demonstrated in senescing leaves yet, a number of physiological studies strongly suggest that it involves PCD.Flower: Two examples of PCD have been recently demonstrated in flowers. In pea flowers, the carpel undergoes PCD when pollination is prevented by emasculation. This senescence of the carpel is stimulated by ethylene and inhibited by treatment with GA. In dying carpels, oligonucleosomal DNA fragmentaion has been observed [11]. Another example of PCD in flower development is elimination of sex organ in unisexual flowers. For instance, in maize stamen primordia abort early in development of female flowers [12].Many examples of PCD during normal development of plants described above strongly suggest that plants employ PCD to eliminate some cells or generate specialized cells such as TEs in development. However, at the moment little is known on molecular mechanisms regulating the PCD in plant development. Furthermore, whether there are multiple pathways for various PCDs observed during development remains to be studied in the future.

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Close, Yet Separate: Patterns of Male and Female Floral Development in Monoecious Species

Perl‐Treves

Rajagopalan

Flowering and Its Manipulation

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Sex Determination in Flowering Plants

Cited by 86 publications

References 41 publications

Sex-linked AFLP markers indicate a pseudoautosomal region in hemp (Cannabis sativa L.)

Sex-linked AFLP markers indicate a pseudoautosomal region in hemp (Cannabis sativa L.)

Programmed Cell Death in Plants.

Close, Yet Separate: Patterns of Male and Female Floral Development in Monoecious Species

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