Pollen, pistil and their interrelations in<i>Borago officinalis</i>and<i>Heliotropium europaeum</i>(Boraginaceae)

Ghorbel, Safia; Nabli, Mohamed Abdelhamid

doi:10.1080/00173139809362668

Cited by 15 publications

(10 citation statements)

References 47 publications

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“…Fitting of the pollen in papillar interstices is favoured by the unhydrated condition of the grains, because of their smaller size, as has recently been shown for Borago officinalis (Ghorbel and Nabli 1998). On the basis of our observations, the prolate and subprolate grains (the great majority in the Boragineae) tend to enter these interstices by orienting the polar axis in a position more or less parallel to the papillar height, at least in those taxa with the typical lageniform papillae (Figs.…”

Section: Functional Aspects Of Pollen-stigma Relationshipssupporting

confidence: 81%

Stigma form and surface in the tribe Boragineae (Boraginaceae): micromorphological diversity, relationships with pollen, and systematic relevance

Bigazzi¹,

Selvi²

2000

Can. J. Bot.

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A comparative analysis of stigma form in 62 species representing 15 genera of the tribe Boragineae by means of light and electron (transmission and scanning) microscopy highlighted the structural diversity, peculiarity, and functional specialization of the receptive surface of the boraginaceous stigma. Cluster analysis identified 13 stigma morphotypes, 6 of which were peculiar to the genera Anchusella, Brunnera, Cynoglottis, Gastrocotyle, Pentaglottis, and Trachystemon. Nonea showed the broadest intrageneric stigma polymorphism, with 6 types differing in terms of stigma form and papillar structure. Stigma and pollen variations were poorly associated in this complex genus, while in other groups, the pollen-stigma typological correspondence indicated the taxonomic distinctiveness of some critical species, such as Gastrocotyle hispida (Forssk.) C.B. Clarke and Anchusella spp. Positive correlations were found between pollen and papillar size, between interpapillar distance and pollen equatorial diameter, and between pollen volume and style length. Qualitative and quantitative pollen-stigma relationships suggested functional implications of an adaptive nature that were interpreted through the recognition of three distinct stages of early interaction, i.e., capture, lodging, and hydration of the grains.Résumé : L'étude comparative de la forme et de la surface réceptive du stigmate dans 62 espèces de 15 genres de la tribu Boragineae, au moyen de la microscopie optique et électronique à transmission et à balayage, a mis en évidence la diversité structurale, la particularité et la spécialisation fonctionnelle de cette surface. L'analyse multivariée a permis de identifier 13 morphotypes, dont 6 exclusifs de genres Anchusella, Brunnera, Cynoglottis, Gastrocotyle, Pentaglottis et Trachystemon. Nonea a montré un polymorphisme intragénérique élevé, avec six types different dans la form du stigmate et la structure des papilles. Dans ce genre, la variation du stigmate est faiblement associée avec la diversité palynologique, tandis que dans des autres groups la correspondance entre la diversité stigmatique et palynologique a confirmé l'originalité taxonomique de quelques espèces critiques, comme Gastrocotyle hispida (Forssk.) C.B. Clarke et Anchusella spp. La dimension du pollen est corrélée avec celle des papilles du stigmate, et le diamètre equatorial du pollen avec leur distance sur la surface réceptive. Le volume du pollen est correlé avec la longuer du style. Les rapports quantitatifs et qualitatifs entre les papilles de la surface réceptive et le pollen suggère des implications fonctionnelles de nature adaptative interprétées en fonction de trois phases d'interaction précoce, c'est-à-dire capture, logement et hydratation des grains de pollen.

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Section: Functional Aspects Of Pollen-stigma Relationshipssupporting

confidence: 81%

Stigma form and surface in the tribe Boragineae (Boraginaceae): micromorphological diversity, relationships with pollen, and systematic relevance

Bigazzi¹,

Selvi²

2000

Can. J. Bot.

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“…We had observed that stigma surface of borage flower did not carry any exudate, which is the main trait to define this kind of stigma as dry type (Montaner 1997). Also Ghorbel & Nabli (1998) said that no stigmatic exudation has been observed on the mature papillae. This fact is in accordance with the statement made by Van Went & Willemse (1984) and Zhang et al (1997) who said that binucleate pollen seems to be correlated with both wet and dry stigmas, whereas trinucleate pollen prefers a dry stigma.…”

Section: Pollen Cytologymentioning

confidence: 99%

“…It was stated that pollen is difficult to germinate in vitro, it losses viability shortly after anther dehiscence and in the case of incompatible pollinations pollen tubes tend to be inhibited on the stigmatic surface (Mulcahy & Mulcahy 1983). Ghorbel and Nabli (1998) said that borage pollen remained dehydrated after self-pollination, like a sign of self-rejection. However, Crowe (1971) affirmed that the incompatibility reaction occurs after fertilization although our data (Montaner et al 2000 a) demonstrated that there is not self-incompatibility and incompatible crosses have not been detected.…”

Section: Pollen Cytologymentioning

confidence: 99%

“…Hermaphrodite flowers develop when spring arrives and flowering extends over a period of approximately two months (Alvarez & Villa 1999). Ghorbel & Nabli (1998) described pollen exine and intine nature, stigma and style characteristics and pollenpistil interrelations. Protandry, geitonogamy and selfcompatibility have been defined in borage (Montaner 1997 in disagreement with the polygenic, postzigotic self-incompatibility system described by Crowe (1971).…”

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confidence: 99%

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Study of pollen cytology and evaluation of pollen viability using in vivo and in vitro test, in borage ( Borago officinalis L.)

Montaner

Floris

Alvarez³

2003

Grana

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“…Although Boraginaceae is one of the most familiar families, and analyzed by the aspects of taxonomic characters, fruit coat patterns (Akçin and Baki, 2009), flower ecology (Denisow, 2008), pollen-pistil interaction (Ghorbel and Nabli, 1998) and pollen cytology (Montaner et al, 2003), related embryological data are limited. It has been known that studies on sexual process and reproduction are supplementary to phylogenetics and of special value at the genus level (Grant, 1981).…”

Section: Discussionmentioning

confidence: 99%

Development of Male and Female Gametophyte in Symphytum orientale L. (Boraginaceae)

Vardar

Yavuz

2018

Not Sci Biol

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The presented study elucidates developmental features of male and female gametophyte in Symphytum orientale L. (Boraginaceae). Flower buds were collected from natural habitats (İstanbul-Turkey) in March-April. The anthers of S. orientale were tetrasporangiate with a persistent epidermis and its wall development conformed to the Dicotyledonous type. The endothecium developed fibrous wall thickenings. The middle layer was short-lived and the cells of the glandular tapetum became double nucleated. In the microspore mother cells cytokinesis originated simultaneously after meiosis and the microspore tetrads were tetrahedral or isobilateral. The mature pollen grains were 3-celled when spread to environment. The ovule was hemianatropous, unitegmic and tenuinucellar. The megaspore mother cell functioned directly from the archesporial cell. Polygonum type embryo sac developed from the chalazal megaspore of a linear tetrad generated after meiosis. The synergids were pyriform and the polar nuclei fused shortly before fertilization. The antipodal cells were large and persistent at the stage of globular embryo. Embryogenesis followed the Chenopodiad type and the endosperm represented cellular type. The detailed embryological data of Symphytum orientale L. (Boraginaceae), which is a herbaceous and perennial flowering plant will improve our knowledge of its reproductive behaviour, and provide to comprehend taxonomic connection with related taxa within the Symphytum/Boraginaceae.

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Pollen, pistil and their interrelations inBorago officinalisandHeliotropium europaeum(Boraginaceae)

Cited by 15 publications

References 47 publications

Stigma form and surface in the tribe Boragineae (Boraginaceae): micromorphological diversity, relationships with pollen, and systematic relevance

Stigma form and surface in the tribe Boragineae (Boraginaceae): micromorphological diversity, relationships with pollen, and systematic relevance

Study of pollen cytology and evaluation of pollen viability using in vivo and in vitro test, in borage ( Borago officinalis L.)

Development of Male and Female Gametophyte in Symphytum orientale L. (Boraginaceae)

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