Gametophyte Ontogeny, Sex Expression, and Genetic Load as Measures of Population Divergence in Blechnum spicant

Cousens, Michael I.

doi:10.2307/2442514

Cited by 29 publications

(12 citation statements)

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“…These sequences were the same independently of whether the gametophytes were maintained in isolation (condition 1) or as one of a pair (conditions 2 and 3). In C. macrocarpa, however, the time-courses of this sequence differed between the two populations, probably reflecting genetic differences (Cousens, 1979). Nevertheless, the two species have clearly characteristic sequences, which coincide with those described for C. macrocarpa by Stokey (1930), Rezende-Pinto (1943) and Mukherjee and Sen (1986), and with Klekowski's (1969b), experimental findings for W. radicans.…”

Section: Gametangium Sequencesupporting

confidence: 78%

Comparative study of the sympatric ferns Culcita macrocarpa and Woodwardia radicans: Sexual phenotype

Quintanilla

Pangua

Vázquez

et al. 2005

Flora - Morphology, Distribution, Functional Ecology of Plants

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Section: Gametangium Sequencesupporting

confidence: 78%

Comparative study of the sympatric ferns Culcita macrocarpa and Woodwardia radicans: Sexual phenotype

Quintanilla

Pangua

Vázquez

et al. 2005

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…In the homogenized cultures, both the delayed growth and the male sexual pattern observed in the gametophytes could be because of the protocol used to prepare this type of culture. The use of the type of culture prepared involves changes in the composition of the medium by the excretion of undefined compounds from the broken mature gametophytic tissue, including pheromone antheridiogens, which induce maleness in the youngest gametophytes (Döpp 1950;Näf 1956;Cousens 1979). Indeed, the induction of maleness in spore-derived gametophytes cultured in medium supplemented with an aqueous extract obtained during the homogenization process of mature gametophytes conclusively proves the epigenetic action on sexual development by some compounds present in the mature gametophyte of B. spicant.…”

Section: Discussionmentioning

confidence: 99%

Growth and gender in the gametophyte of Blechnum spicant L

Menéndez

Revilla

Fernández

2006

Plant Cell Tiss Organ Cult

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The growth and gender in the gametophyte of Blechnum spicant L. were strongly affected by its origin, spore or mature homogenized gametophytes, and also by the addition of plant growth regulators to the culture medium. Spore-derived gametophytes cultured in Murashige and Skoog liquid medium were females and heart-shaped, whereas those derived from mature homogenized gametophytes were shorter and male or asexual (1:3) because of the release of antheridiogen to the culture medium. In the latter, maleness was especially increased by the addition of BA. This cytokinin is a strong inductor of maleness in homogenized cultures; however, even though BA influenced sexual organ formation in spore-derived gametophytes, it does not change the female sexual pattern that these gametophytes have. Separate male and female populations of gametophytes were obtained in this work.

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“…Population resources are limited by competition, and gametophytes are often asexual or male, and narrow. On the other hand female and hermaphroditic gametophytes often occur in sparse populations (Cousens 1979). Plant growth and development ultimately depend upon environmental variables, such as temperature, light intensity and the availability of water and essential minerals (Marschner 1995).…”

Section: Gametophytes Of C Macrocarpamentioning

confidence: 99%

Effect of Nutrients on Environmental Sex Determination and Size of Gametophytes in Culcita macrocarpa

2014

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:In environmental sex determination (ESD) gender is decided after conception, depending on the environment, rather than being genetically fixed. ESD has rarely been studied in homosporous ferns. In the present study, Culcita macrocarpa gametophytes were cultured under varying nutrient conditions. Initially, most of the gametophytes of Culcita macrocarpa were male and subsequently hermaphrodite under different nutrition. The result indicates that its sex determination is protandry. All nutrient conditions were favourable for developing male prothalli but only good environment (high nutrient) was favourable for female gametophyte growth. In all respects, female gametophytes were much larger, than the other types of gametophytes. Hermaphroditic gametophytes were larger than male gametophytes, which were larger than asexual gametophytes.Key Words: Environmental sex determination, homosporous fern, Culcita macrocarpa, protandry, hermaphroditic. mvivsk t cwi ‡ekxq wj½ wba© vi ‡Yi(ESD) † ¶ ‡Î Mf© avi ‡Yi ci wj½ wba© viY RxbMZ wba© vi ‡Yi †P ‡q cwi ‡ekxq wba© vi ‡Yi Dci ‡ekx wbf© ikxj| mg ‡iYy cÖ m~ dv ‡Y© cwi ‡ekxq wj½ wba© viY m¤ú ‡K© wKQy M ‡elYv n ‡q ‡Q| eZ© gvb M ‡elYvq wewfboe cy wó ‡ ¶ ‡Î Culcita macrocarpa Gi Pvl Kiv n ‡q ‡Q| cÖ v_wgK ch© v ‡q wewfboe cy wóMZ Ae¯' vq C. macrocarpa Gi AwaKvsk wj ‡½i Dw™¢ cy i"l Ges cieZx© ‡Z Dfwj½| djvdj wb ‡`© k K ‡i †h,G ‡`i wj½ wba© viY †cÖ vUvwÛª (Protandry)| mKj cy wó gva¨g cy s †cÖ v ‡_jv ‡mi Rb¨ Dchy ³ wKš' ïay gvÎ fvj cwi ‡ekB ¯¿ x wj½a ‡ii Rb¨ Dchy ³| mKj † ¶ ‡Î, ¯¿ x wj½ai Ab¨ mKj wj½ai Dw™¢ ‡`i Zz jbvq AvKv ‡i A ‡bK eo| Dfwj½ wj½ai cy s-wj½ai †_ ‡K eo hv Avevi A ‡hŠb wj½ai †_ ‡K eo|

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Gametophyte Ontogeny, Sex Expression, and Genetic Load as Measures of Population Divergence in Blechnum spicant

Cited by 29 publications

References 0 publications

Comparative study of the sympatric ferns Culcita macrocarpa and Woodwardia radicans: Sexual phenotype

Comparative study of the sympatric ferns Culcita macrocarpa and Woodwardia radicans: Sexual phenotype

Growth and gender in the gametophyte of Blechnum spicant L

Effect of Nutrients on Environmental Sex Determination and Size of Gametophytes in Culcita macrocarpa

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