ABSCISIC ACID EFFECTS ON SPORE GERMINATION AND PROTONEMAL GROWTH IN THE FERN, <i>MOHRIA CAFFRORUM</i>

Chia, Shih-Gee E.; Raghavan, V.

doi:10.1111/j.1469-8137.1982.tb03360.x

Cited by 18 publications

(8 citation statements)

References 26 publications

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“…ABA is present in the gametophytic tissues such as spores and filamentous gametophytes of Anemia phyllitidis (Bürcky, 1977;Cheng and Schraudolf, 1974). ABA inhibits the elongation of protonema in Mohria caffrorum, the formation of adventitious gametophytes from nonmeristematic explants of A. phyllitidis and antheridiogeninduced antheridia formation in Ceratopteris richardii (Chia and Raghavan, 1982;Hickok, 1983;Reynolds, 1981). ABA induces the land form of morphological characteristics in the plants of Marsilea quadrifolia (Lin, 1984).…”

Section: Phytohormones In Pteridophytes and Their Rolementioning

confidence: 99%

Hormonal regulation in green plant lineage families

Johri

2008

Physiol Mol Biol Plants

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The patterns of phytohormones distribution, their native function and possible origin of hormonal regulation across the green plant lineages (chlorophytes, charophytes, bryophytes and tracheophytes) are discussed. The five classical phytohormonesauxins, cytokinins, gibberellins (GA), abscisic acid (ABA) and ethylene occur ubiquitously in green plants. They are produced as secondary metabolites by microorganisms. Some of the bacterial species use phytohormones to interact with the plant as a part of their colonization strategy. Phytohormone biosynthetic pathways in plants seem to be of microbial origin and furthermore, the origin of high affinity perception mechanism could have preceded the recruitment of a metabolite as a hormone. The bryophytes represent the earliest land plants which respond to the phytohormones with the exception of gibberellins. The regulation by auxin and ABA may have evolved before the separation of green algal lineage. Auxin enhances rhizoid and caulonemal differentiation while cytokinins enhance shoot bud formation in mosses. Ethylene retards cell division but seems to promote cell elongation. The presence of responses specific to cytokinins and ethylene strongly suggest the origin of their regulation in bryophytes. The hormonal role of GAs could have evolved in some of the ferns where antheridiogens (compounds related to GAs) and GAs themselves regulate the formation of antheridia.During migration of life forms to land, the tolerance to desiccation may have evolved and is now observed in some of the microorganisms, animals and plants. Besides plants, sequences coding for late embryogenesis abundant-like proteins occur in the genomes of other anhydrobiotic species of microorganisms and nematodes. ABA acts as a stress signal and increases rapidly upon desiccation or in response to some of the abiotic stresses in green plants. As the salt stress also increases ABA release in the culture medium of cyanobacterium Trichormus variabilis, the recruitment of ABA in the regulation of stress responses could have been derived from prokaryotes and present at the level of common ancestor of green plants. The overall hormonal action mechanisms in mosses are remarkably similar to that of the higher plants. As plants are thought to be monophyletic in origin, the existence of remarkably similar hormonal mechanisms in the mosses and higher plants, suggests that some of the basic elements of regulation cascade could have also evolved at the level of common ancestor of plants. The networking of various steps in a cascade or the crosstalk between different cascades is variable and reflects the dynamic interaction between a species and its specific environment.

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Section: Phytohormones In Pteridophytes and Their Rolementioning

confidence: 99%

Hormonal regulation in green plant lineage families

Johri

2008

Physiol Mol Biol Plants

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“…Microarray analysis of spore germination in the fern Ceratopteris implicated involvement of GA signalling and downregulation of ABA signalling in this process, similarly to seeds (Yao et al, 2008). However, different fern species' spores have different sensitivities to GA and ABA application (Weinberg & Voeller, 1969;Chia & Raghavan, 1982;Singh et al, 1990;Kagawa & Michizo, 1991;Haas et al, 1992). The GA biosynthesis inhibitor AMO-1618, which blocks the first step(s) in the GA biosynthesis pathway (Rademacher, 2000), can inhibit some (but not all) light-induced fern spore germination (Weinberg & Voeller, 1969;Nester & Coolbaugh, 1986;Kagawa & Michizo, 1991).…”

Section: Introductionmentioning

confidence: 99%

The decision to germinate is regulated by divergent molecular networks in spores and seeds

et al. 2016

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Summary Dispersal is a key step in land plant life cycles, usually via formation of spores or seeds. Regulation of spore‐ or seed‐germination allows control over the timing of transition from one generation to the next, enabling plant dispersal. A combination of environmental and genetic factors determines when seed germination occurs. Endogenous hormones mediate this decision in response to the environment. Less is known about how spore germination is controlled in earlier‐evolving nonseed plants.Here, we present an in‐depth analysis of the environmental and hormonal regulation of spore germination in the model bryophyte Physcomitrella patens (Aphanoregma patens).Our data suggest that the environmental signals regulating germination are conserved, but also that downstream hormone integration pathways mediating these responses in seeds were acquired after the evolution of the bryophyte lineage. Moreover, the role of abscisic acid and diterpenes (gibberellins) in germination assumed much greater importance as land plant evolution progressed.We conclude that the endogenous hormone signalling networks mediating germination in response to the environment may have evolved independently in spores and seeds. This paves the way for future research about how the mechanisms of plant dispersal on land evolved.

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“…It has been shown that ABA is present in various fern species (Weiler 1979;Cheng and Schraudolf 1974;Yamane et al 1980Yamane et al , 1988Pilate et al 1989) and in some lycophytes. In ferns, ABA plays roles in inhibition of growth (Swami and Raghavan 1980;Chia and Raghavan 1982;Hickok 1983), control of sex determination (Hickok 1983;Warne and Hickok 1991), and heterophyllous switch in aquatic fern plants (Liu 1984;Hsu et al 2001;Lin et al 2005). In addition, ABA is thought to play a role in desiccation tolerance in ferns and lycophytes (Reynolds and Bewley 1993a, b;Pence 2000;Liu et al 2008).…”

Section: Introductionmentioning

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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ABSCISIC ACID EFFECTS ON SPORE GERMINATION AND PROTONEMAL GROWTH IN THE FERN, MOHRIA CAFFRORUM

Cited by 18 publications

References 26 publications

Hormonal regulation in green plant lineage families

Hormonal regulation in green plant lineage families

The decision to germinate is regulated by divergent molecular networks in spores and seeds

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

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