Role of aba metabolism and signaling in maintaining seed dormancy. Preharvest sprouting phs, the germination of seeds on the maternal plant before harvest, is a big challenge for barley producers worldwide. This paper reports on the relationships occurring in red rice between aba and seed dormancy. Abscisic acid is a plant hormone involved in many developmental plant processes, such as dormancy and environmental stress response. The role of gibberellin and abscisic acid in regulating preharvest sprouting in barley hordeum vulgare l. This study was conducted to assess the role of abscisic acid in the induction of tuber dormancy. Here we report the characterization of two abarelated seed dormancy regulators in arabidopsis. A seed may be nondormant and germinate immediately. Get a printable copy pdf file of the complete article 1. Renee drewesalvarez, in reference module in life sciences, 2017.
The role of abscisic acid in plantpathogen interactions. Role of abscisic acid in seed dormancy researchgate. However, the aba in the seed does seem to have a regulatory role in germination. The scba was used to further show the importance of the endosperm in nondormant seeds. Seed dormancy in commercial vegetable and flower species.
Auxin controls seed dormancy through stimulation of abscisic acid signaling by inducing arfmediated abi3 activation in arabidopsis xiaodong liu a, hong zhang, yang zhaob, zhengyan fenga, qun lia, hongquan yangc, sheng luand, jianming lie, and zuhua hea,1 anational key laboratory of plant molecular genetics, institute of plant physiology and ecology and. The development of primary and secondary dormancy in seeds and factors influencing its inception, degree, and termination. Abscisic acid and the control of seed dormancy and germination. The transition from dormancy to germination in seeds is a key physiological process during the lifecycle of plants.
Role of abscisic acid in seed dormancy semantic scholar. It has an essential role in multiple physiological processes of plants, such as stomatal closure, cuticular wax accumulation, leaf senescence, bud dormancy, seed germination, osmotic regulation, and growth inhibition among many others. A role of hy5 in seed dormancy establishment in contrast to its ability to break seed dormancy and promote germination, light is much less known for its possible role in. Auxin controls seed dormancy through stimulation of. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Dormant seeds from fraxinus species require coldtemperature afterripening prior to germination. Full text full text is available as a scanned copy of the original print version. Roles of gibberellins and abscisic acid in dormancy and germination of red bayberry myrica rubra seeds, tree physiology, volume 28, issue 9.
Role of hy5 in abscisic acid response in seeds and seedlings hao chen and liming xiong donald danforth plant science center. Aba positively regulates the induction and maintenance of. The sesquiterpene abscisic acid aba regulates key events during seed formation, such as the deposition of storage reserves, prevention of precocious germination, acquisition of desiccation tolerance, and induction of primary dormancy. Seed dormancy causes, types, methods and its importance. Pdf abscisic acid and the control of seed dormany and germination. Roles of gibberellins and abscisic acid in dormancy and. The main reason behind these conditions is that they require a period of rest before. Abscisic acid aba is the sole plant hormone known to maintain seed dormancy. Role of abscisic acid in seed dormancy pdf paperity. This paper reports on the relationships occurring in. The complex process regulated by abscisic acid, gibberellins, and other phytohormones that makes seed germination work. The control of seed dormancy by abscisic acid aba has been extensively studied, but the underlying mechanism is not fully understood. Pdf abscisic acid aba is a plant hormone that regulates seed dormancy and germination.
Geneve department of horticulture university of kentucky lexington, ky 40546 introduction following seed dissemination from the plant, orthodox seeds exhibit one of three conditions. Abscisic acid aba is commonly assumed to be the primary effector of seed dormancy, but conclusive evidence for this role is lacking. Using milborrows quantitative racemate dilution method the aba concentration in 3 types of fraxinus seed and pericarp were determined. Seeds undergo changes in both aba content and sensitivity during seed development and germination in response to internal and external cues. Ayele common wheat is the one of the most important cereal crop in the world. Abscisic acid levels and seed dormancy plant physiology. Earlier, we found that abscisic acid aba will inhibit germination of excised nondormant embryos and that this. Plant hormones, mainly abscisic acid aba and gibberellin ga, are the. The role of gibberellin and abscisic acid in regulating. Response to abscisic acid application and hormone profiles. Abscisic acid dynamics, signaling, and functions in plants. Frontiers molecular mechanisms underlying abscisic acid. Abstract dormancy prevents field yams tubers from sprouting, even when environmental conditions are favourable, until 270 days after tuber initiation. The agricultural and forest industries rely on seeds that exhibit high rates of germination and vigorous, synchronous growth after germination.
Seed dormancy can be defined as the state or a condition in which seeds are prevented from germinating even under the favourable environmental conditions for germination including, temperature, water, light, gas, seed coats, and other mechanical restrictions. Robert h gulden, sheila chiwocha, suzanne abrams, ian mcgregor, allison kermode, and. The function of pm19l1 represents a good opportunity to explore the interactions of key factors that can influence seed dormancy such as aba, temperature and membrane properties. Reversal of rdo5 1, a homolog of rice seed dormancy 4. Download citation role of abscisic acid in seed dormancy seed. Pdf role of abscisic acid in dormancy of viviparous and. Plant hormones, mainly abscisic acid aba and gibberellin ga, are the major endogenous factors that act antagonistically in the control of seed dormancy and germination. Role of abagibberellin interactions in dormancy and germination abscisic acid and gibberellins gas are generally believed to act antagonistically to control both dormancy breakage and germination karssen and lacka 1986. Role of abscisic acid in seed dormancy role of abscisic acid in seed dormancy kermode, allison r. Addicott and his associates discovered abscisic acid in the early 1960s in the process of studying abscission in cotton commercially important for mechanization of cotton picking. The levels of endogenous aba and iaa change in developing embryos of floribunda roses.
Citeseerx document details isaac councill, lee giles, pradeep teregowda. Seed dormancy in commercial vegetable and flower species robert l. Kermode department of biological sciences, simon fraser university, 8888 university dr, burnaby, british columbia v5a 1s6, canada abstract seed dormancy is an adaptive trait that improves survival of the next generation by optimizing the distribution of germination over time. Its regulatory role is achieved by mechanisms that. The arabidopsis abscisic acid catabolic gene cyp707a2. Abscisic acid is called stress hormones as it induces various responses in plants against stress conditions. Figure 1 from role of abscisic acid in seed dormancy. Dormancy allows seeds to tolerate desiccation and extremes of temperature better. It induces the closure of the stomata during water stress. History discovered in ash treespotato tuber levels declined when dormancy broken growth inhibitor ga antagonist.
Removing the hard endocarp or endocarp plus seed coat of fresh seeds promoted germina tion, and addition of ga3 to the embryo accelerated germina tion. The agricultural and forest industries rely on seeds that exhibit high rates of germination and. An early farred light pulse that blocks germination. Response to abscisic acid application and hormone profiles in spring brassica napus seed in relation to secondary dormancy. This negative effect appears to be due to the interference of abscisic acid with biotic stress signaling that is regulated by salicylic acid, jasmonic acid and ethylene, and to an additional effect of aba on shared components of stress signaling.
A role of abscisic acid in the induction of tuber dormancy. The buds as well as seeds sprout only when abscisic acid is overcome by gibberellins. Abscisic acid and the control of seed dormany and germination article pdf available in seed science research 2002 june 2010 with 7,515 reads how we measure reads. Aquaporins influence seed dormancy and germination in. Aba functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure.
Abscisic acid aba is a plant hormone that regulates seed dormancy and germination. Content of free aba in dry and imbibed caryopses, both dormant and after. Abscisic acid aba is a phytohormone which is involved in maintaining physiological dormancy, and indole3acetic acid iaa is an important phytohormone in cell division. The role of abscisic acid and its catabolic genes in the regulation of wheat seed dormancy and germination ph. Pdf abscisic acid and the control of seed dormany and. Aba metabolism and its role in regulating dormancy during seed. Abscisic acid history chemistry transport physiological action.
Because of its action in inducing dormancy, abscisic acid or aba is also named as dormin. Odr1 for reversal of rdo5, an orthologue of the rice seed dormancy 4 sdr4, and the basic helixloophelix. Abscisic acid transporters cooperate to control seed germination. Pdf on the role of abscisic acid in seed dormancy of red. The sesquiterpene abscisic acid aba regulates many processes during the plant life cycle, including key events during seed formation, such as the deposition of storage reserves, prevention of precocious germination, the acquisition of desiccation tolerance, and the induction of primary dormancy. Seed dormancy is an adaptive trait that improves survival of the next generation by optimizing the distribution of germination over time. It increases the tolerance of plants toward various stresses. The sesquiterpene abscisic acid aba regulates many processes during the plant life cycle, including key events during seed formation, such as. The role of abscisic acid and its catabolic genes in the. Seed science research a role for pm19like 1 in seed. A possible role of abscisic acid aba in this regard has been proposed but not established in yam.
Role of abscisic acid in seed dormancy springerlink. Dormancy prevents field yams tubers from sprouting, even when environmental conditions are favourable, until 270 days after tuber initiation. It was also being studied by other plant physiologists at the same time for its property of controlling abscission of flowers and in the initiation of dormancy of wood production. The role of ja jasmonic acid in seed dormancy is ambiguous. It promotes seed dormancy and ensures seed germination during favourable conditions. It is especially important for plants in the response to environmental stresses, including drought, soil salinity, cold tolerance, freezing tolerance, heat stress and heavy metal ion tolerance. Earlier, we found that abscisic acid aba will inhibit germination of excised nondormant embryos and that this can be reversed with a combination of gibberellic acid and kinetin. This study was conducted to assess the role of abscisic acid in the induction of tuber dormancy in d.
In this article, we propose to discuss the types of seed dormancy and its role in plants life. Roles of gibberellins and abscisic acid in dormancy and germination of red bayberry myrica rubra seeds shunying chen. Citeseerx on the role of abscisic acid in seed dormancy. The arabidopsis abscisic acid catabolic gene cyp707a2 plays a key role in nitrate control of seed dormancy 1, theodoros matakiadis. Seed tips also contribute to the regulation of depth of primary dormancy and differences in the induction of second. With few exceptions, abscisic acid has been considered a negative regulator of disease resistance. On the role of abscisic acid in seed dormancy of red rice. Abscisic acid aba is an important phytohormone regulating plant growth, development, and stress responses. Abscisic acid and the control of seed dormancy and.
Roles of gibberellins and abscisic acid in dormancy and germination. In seed coat dormancy, the seed coat prevents oxygen andor water permeating into the seed. Dormancy has a significant role in the development of new species and the successful dispersal of existing species. Its regulatory role is achieved in part by crosstalk with other hormones and their associated signaling. The increased ja content was detected in nondormant arabidopsis seeds. Seed dormancy is a mechanism that prevents a viable seed from germinating when placed in an ideal environment for germination. Role of hy5 in abscisic acid response in seeds and seedlings. Abscisic acid aba is a plant hormone that regulates seed dormancy and.