On the hormonal nature of the stimulatory effect of high incubation temperatures on germination of dormant sorghum (<i>S. bicolor</i>) caryopses

Benech‐Arnold, Roberto L.; Enciso, Silvina; Sánchez, Rodolfo A.; Rodríguez, María Verónica

doi:10.1046/j.1469-8137.2003.00900.x

Cited by 16 publications

(19 citation statements)

References 14 publications

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“…Temperature effects on dormancy and germination seeds germinate at temperatures that, otherwise, would allow the expression of dormancy (Dutta and Bradford, 1994;Benech-Arnold et al, 2003;Batlla and Padilla, 2006). This different dormancy level among individuals would be manifested as a different temperature at which dormancy starts to be expressed or, in terms of Washitani's equation, as a different 'lower limit (T l )' or 'higher limit temperature (T h )'.…”

Section: Temperature Effects On Seed Germination and Dormancymentioning

confidence: 99%

A framework for the interpretation of temperature effects on dormancy and germination in seed populations showing dormancy

2015

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A framework for the interpretation of temperature effects on dormancy and germination in seed populations showing dormancy. AbstractTemperature is a key factor affecting both dormancy and germination. In non-dormant seeds, when temperature is within the thermal range permissive for germination, it just regulates germination velocity, while in seeds presenting dormancy it can also be affecting dormancy level, dormancy termination and the expression of dormancy itself. This dual effect of temperature on dormancy and germination often leads to misinterpretation of obtained germination results and confounds the analysis of temperature effects in seed populations presenting some degree of dormancy. In the present paper we discuss the effect of temperature in the regulation of dormancy level and its implications in dormancy expression, as an attempt to construct a conceptual framework that allows distinguishing between the effects of temperature on dormancy and germination. Finally, we present examples of how a better understanding of these effects could help us to interpret the mixed effects of temperature on both processes during incubation of seeds presenting dormancy.

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Section: Temperature Effects On Seed Germination and Dormancymentioning

confidence: 99%

A framework for the interpretation of temperature effects on dormancy and germination in seed populations showing dormancy

2015

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“…Similarly, application of a GA biosynthesis inhibitor to young sorghum panicles reduced GA content during development and delayed dormancy release for several weeks in a typically short-lived dormancy line (Steinbach et al, 1997). Similar to observations on ABA in developing grains of sorghum varieties with contrasting dormancy, no correlation has been found between natural endogenous GA content and dormancy (Benech-Arnold et al, 2000).…”

Section: Hormonal Regulation Of Dormancymentioning

confidence: 52%

“…In contrast, in sorghum (a summer crop, dormancy expression being promoted at lower temperatures), the improvement of germination at high temperatures cannot be explained by changes in either embryo ABA sensitivity or ABA content (Benech-Arnold et al, 2003).…”

Section: Temperaturementioning

confidence: 98%

“…On the contrary, dormant seeds from tropical cereals reach higher germination values at high incubation temperatures, the optimum being close to 25 -308C, while they germinate poorly (i.e. dormancy is expressed) at lower temperatures (Simpson, 1990;Benech-Arnold et al, 2003). Dormant grains can also be very sensitive to other factors that inhibit germination, such as oxygen deprivation (Corbineau and Cô me, 1980;Corbineau et al, 1981Corbineau et al, , 1986Lenoir et al, 1983Lenoir et al, , 1986Bradford et al, 2007Bradford et al, , 2008, low water potential of the medium (Corbineau and Cô me, 1996) and exposure to light, in particular blue light (Chaussat and Zoppolo, 1983;Gubler et al, 2008;Jacobsen et al, 2013;Barrero et al, 2014;Hoang et al, 2014).…”

Section: Environmental Factors and Dormancy Expression Induction Andmentioning

confidence: 99%

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Dormancy in cereals (not too much, not so little): about the mechanisms behind this trait

et al. 2015

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As in other cultivated species, dormancy can be seen as a problem in cereal production, either due to its short duration or to its long persistence. Indeed, cereal crops lacking enough dormancy at harvest can be exposed to pre-harvest sprouting damage, while a long-lasting dormancy can interfere with processes that rely on rapid germination, such as malting or the emergence of a uniform crop. Because the ancestors of cereal species evolved under very diverse environments worldwide, different mechanisms have arisen as a way of sensing an appropriate germination environment (a crucial factor for winter or summer annuals such as cereals). In addition, different species (and even different varieties within the same species) display diverse grain morphology, allowing some structures to impose dormancy in some cereals but not in others. As in seeds from many other species, the antagonism between the plant hormones abscisic acid and gibberellins is instrumental in cereal grains for the inception, expression, release and re-induction of dormancy. However, the way in which this antagonism operates is different for the various species and involves different molecular steps as regulatory sites. Environmental signals (i.e. temperature, light quality and quantity, oxygen levels) can modulate this hormonal control of dormancy differently, depending on the species. The practical implications of knowledge accumulated in this field are discussed.

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“…Such environmental cueing has been demonstrated not only in response to cold stratification prior to germination (Murdoch and Ellis 1992;Milberg and Andersson 1998;Bu et al 2008), but also in response to minute changes in temperature regime (Cavieres and Arroyo 2000), light intensity (Bell et al 1995) or spectral quality (Batlla et al (Karssen and Hilhorst 1992), moisture (Pérez-Ferández et al 2000) and interaction between factors (Finch-Savage and Leubner-Metzger 2006). Pre-chilling is known to induce changes in ABA and GA levels, and the sensitivity to these hormones has been associated with physiological responses that occur after stratification and result in germination (Benech-Arnold et al 2003;Yamauchi et al 2004;Finkelstein et al 2008). Treatment of pre-chilled seeds with GA 3 had a significant promontory effect on seed germination in all the three species.…”

Section: Discussionmentioning

confidence: 99%

Germination studies on three critically endangered endemic angiosperm species of the Kashmir Himalaya, India

2008

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The critically endangered and perennial alpine endemic angiosperms, namely, Aquilegia nivalis, Lagotis cashmeriana and Meconopsis latifolia inhabit such habitats in the Kashmir Himalaya that are characterised by short growing season and heavy snow cover for about 3-4 months during winter season. The seeds of these species under natural conditions experience a long period of pre-chilling during winter prior to their germination in following spring season. Taking cue from such a requirement, present study investigated the effect of chilling and exogenous application of growth hormones, NO 3 -and NH 4 + on total percent germination of otherwise deep-dormant seeds of these species, under alternate light/dark and continuous dark light regimes. Prolonged pre-chilling followed by treatment of seeds with different doses of GA 3 had a pronounced stimulatory effect on the total germination percentage in all the three species. In fact, highest germination percentage in A. nivalis was recorded only when prechilled seeds were treated with 1.5 mM GA 3 under alternate light/dark conditions. Likewise, germination of pre-chilled seeds of L. cashmeriana with ruptured seed coats was improved when treated with various concentrations of GA 3 . Seed germination in M. latifolia was also favourably influenced by treatment of pre-chilled seeds with GA 3 or nitrogen applied either as NO 3 -or as NH 4 + under alternate light/dark conditions. Treatment of seeds with kinetin (6-furfuryl-aminopurine) had no significant influence on germination percentage in any of the three species. Thus, prolonged chilling of seeds followed by their treatment with GA 3 under alternate light/dark conditions are the requirements necessary for seed germination in these species.

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On the hormonal nature of the stimulatory effect of high incubation temperatures on germination of dormant sorghum (S. bicolor) caryopses

Cited by 16 publications

References 14 publications

A framework for the interpretation of temperature effects on dormancy and germination in seed populations showing dormancy

A framework for the interpretation of temperature effects on dormancy and germination in seed populations showing dormancy

Dormancy in cereals (not too much, not so little): about the mechanisms behind this trait

Germination studies on three critically endangered endemic angiosperm species of the Kashmir Himalaya, India

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