Effect of Chelating Agents and Metal Ions on Gametangial Formation in the Moss Bryum argenteum Hedw

Bhatla, Satish C.; Chopra, R. N.

doi:10.1093/oxfordjournals.aob.a086633

Cited by 6 publications

(8 citation statements)

References 4 publications

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“…This is probably due to the effect of ABA in counteraction with the bud-promoting action of cytokinin (Christianson 2000). Furthermore, ABA inhibited formation of gametangia in the moss Bryum argenteum and Microdus brasiliensis at high concentrations (Bhatla and Chopra 1981;Chopra and Mehta 1987).…”

Section: Bryophytes and Abamentioning

confidence: 99%

ABA in bryophytes: how a universal growth regulator in life became a plant hormone?

2011

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Abscisic acid (ABA) is not a plant-specific compound but one found in organisms across kingdoms from bacteria to animals, suggesting that it is a ubiquitous and versatile substance that can modulate physiological functions of various organisms. Recent studies have shown that plants developed an elegant system for ABA sensing and early signal transduction mechanisms to modulate responses to environmental stresses for survival in terrestrial conditions. ABA-induced increase in stress tolerance has been reported not only in vascular plants but also in non-vascular bryophytes. Since bryophytes are the key group of organisms in the context of plant evolution, clarification of their ABA-dependent processes is important for understanding evolutionary adaptation of land plants. Molecular approaches using Physcomitrella patens have revealed that ABA plays a role in dehydration stress tolerance in mosses, which comprise a major group of bryophytes. Furthermore, we recently reported that signaling machinery for ABA responses is also conserved in liverworts, representing the most basal members of extant land plant lineage. Conservation of the mechanism for ABA sensing and responses in angiosperms and basal land plants suggests that acquisition of this mechanism for stress tolerance in vegetative tissues was one of the critical evolutionary events for adaptation to the land. This review describes the role of ABA in basal land plants as well as non-land plant organisms and further elaborates on recent progress in molecular studies of model bryophytes by comparative and functional genomic approaches.

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Section: Bryophytes and Abamentioning

confidence: 99%

ABA in bryophytes: how a universal growth regulator in life became a plant hormone?

2011

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“…In Riccia crystallina , maximal antheridial and archegonial production is exhibited at pH 4.5 and 6.5, respectively (Chopra and Sood 1973b ); however, in Riccia gangetica , the values become 4.5 and 7.5, respectively (Dua 1983 ). However, in Bryum argenteum during the transition of vegetative phase to reproductive phase, a sharp reduction in pH of the medium is clearly observed (Bhatla 1981 ).…”

Section: Phmentioning

confidence: 98%

Reproductive Strategies in Bryophytes

Nath

Bansal

2015

Plant Biology and Biotechnology

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IntroductionBryophytes are the second largest group of plants after angiosperms and deserve a much more important place than they have today in biological research. They remained a neglected group of plants until the recent past in spite of their importance as model organisms in macroevolutionary population genetics and especially ecological research. Currently, Physcomitrella patens is one of the fi rst bryophytes model organisms in genomic studies with faster life cycle than Arabidopsis and is particularly advantageous because of dominant gametophyte generation. This is increasingly used for studies on development and molecular evolutionary aspects of plants. To our knowledge, this is the only nonvascular primitive plant with its genome completely sequenced. Moreover, it is currently the only land plant with effi cient gene targeting that enables gene knockout. The resulting knockout mosses are stored and distributed by the International Moss Stock Centre. Recent researches have shown the importance of mosses in transgenic pharmaceuticals production. Among its many assets, P. patens is able to produce human proteins (Hohe et al. 2002 ;Decker et al. 2003 ;Stefan et al. 2008 ) and is the only plant known used to produce the blood-clotting factor IX for pharmaceutical use. AbstractThe chapter deals with the reproductive strategies in bryophytes: both asexual and sexual reproduction, fertilization and the reasons for the failure and their further development. The various factors involved in reproduction and their effects on reproductive biology with brief information on cladistic and molecular studies on phylogeny of bryophytes based on literature are provided.

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“…Sex-specific survival or tolerance (McLetchie and Puterbaugh 2000;Stark et al 2001) can also be excluded, since the two sexes grow intermingled. Regulation by chemical factors may be plausible (Bhatla and Chopra 1981); however, based on field observations, it seems more likely that sex expression is labile and dependent on seasons, age of plants, or other environmental factors (Wyatt and Anderson 1984;Korpelainen1998). It is also likely that the production of male and female organs is sequential, as suggested in the Polytrichaceae (Glime 2007).…”

Section: Sex Expressionmentioning

confidence: 99%

Population genetic consequences of the reproductive system in the liverwort Mannia fragrans

et al. 2008

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Ecological factors affecting reproduction and dispersal are particularly important in determining genetic structure of plant populations. Polyoicous reproductive system is not rare in bryophytes; however, to date, nothing is known about its functioning and possible population genetic effects. Using the liverwort Mannia fragrans as a model species, the main aims of this study were to separate the relative importance of the components of the polyoicous reproductive system and to assess its consequences on the genetic structure of populations. High sex expression rates increasing with patch size and strongly female-biased sex ratios were detected. Additional input into clonal growth after production of sex organs was found in males compared to females. Similar clonal traits of the rare bisexual and asexual plants and preference toward newly colonized patches suggest that selection prefers colonizers that first develop organs of both sexes, hence ensuring sexual reproduction when no partner is present. Despite frequent spore production, ISSR markers revealed low genetic diversity, probably resulting from the effective clonal propagation of the species and frequent crossing between genetically identical plants. The presence of numerous rare alleles and unique recombinant haplotypes indicates occasional recombination and mutation. Effective spreading of new haplotypes is probably hampered however by large spore size. Since populations are small and isolated, such haplotypes are probably continuously eliminated by genetic drift. These results suggest that although both sexual and asexual reproductions seem to be effective, asexual components of the reproductive system play a greater role in shaping the genetic composition of the populations.

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Effect of Chelating Agents and Metal Ions on Gametangial Formation in the Moss Bryum argenteum Hedw

Cited by 6 publications

References 4 publications

ABA in bryophytes: how a universal growth regulator in life became a plant hormone?

ABA in bryophytes: how a universal growth regulator in life became a plant hormone?

Reproductive Strategies in Bryophytes

Population genetic consequences of the reproductive system in the liverwort Mannia fragrans

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