Leaf malformation during early development in <i>Sorghum</i>. Evidence for an embryonic developmental window

Amzallag, G. N.; Seligmann, Hervé; Lerner, H. R.

doi:10.1111/j.1399-3054.1997.tb00562.x

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…When considered together, these results suggest that the reduced growth observed in small SAP transferred from 150 mM to 0 mM or 300 mM NaCl was caused by a change in setting for optimal conditions towards 150 mM NaCl. A similar change has been already observed during germination of the progeny of two successive generations of salt-adapted plants of S. bicolor (Amzallag et al, 1997).…”

Section: Induced Changes In the Progenysupporting

confidence: 81%

Maternal transmission of adaptive modifications in salt‐treated Sorghum bicolor: a first stage in ecotypic differentiation?

Amzallag

2000

New Phytologist

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Following a 3-wk pretreatment with 150 mM NaCl, Sorghum plants were able to survive exposure to 300 mM NaCl, a lethal concentration for nonpretreated plants. This response is termed salt adaptation. Although the population was initially homogeneous, Na-includer and Na-excluder individuals coexisted after the achievement of the salt-adaptation response, and a large diversity in size of the seeds produced was observed at the end of the life cycle. Offspring of salt-adapted plants were exposed to a new salt-adaptation treatment. Even in the absence of selection, the proportion of Na-excluder individuals in the progeny was significantly increased. Offspring germinated from small seeds differed significantly from plants first-exposed to a salt-adaptation treatment, whereas offspring from large seeds displayed intermediate characteristics. This suggests that some of the adaptive changes were transmitted through embryo imprinting. The importance of this phenomenon for emergence of a newly adapted ecotype is discussed.

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Section: Induced Changes In the Progenysupporting

confidence: 81%

Maternal transmission of adaptive modifications in salt‐treated Sorghum bicolor: a first stage in ecotypic differentiation?

Amzallag

2000

New Phytologist

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“…Three such developmental windows have already been described in S. bicolor (L.) Moench exposed to salinity. The first opens during early germination and conditions the embryo to the endosperm and external environment (Amzallag, Seligmann & Lerner 1997). The second opens during early vegetative development and enables adjustment of the seedling to the specific edaphic conditions encountered.…”

Section: Introductionmentioning

confidence: 99%

Adaptive nature of the transition phases in development: the case of Sorghum bicolor

Amzallag

1999

Plant Cell & Environment

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An increase in tolerance to salinity is induced in Sorghum bicolor by exposure to a sublethal concentration of NaCl during early vegetative development. The phase of competence for induction of this response, termed salt adaptation, is well defined in time and it coincides with the emergence of the first adventitious roots. The link between these events was investigated. Competence for salt adaptation varies among genotypes. It is shown that competence is especially high for genotypes in which the link between the seminal root and the shoot is reduced during emergence of the adventitious root. These data relate the capacity for salt adaptation with development in the absence of NaCl, suggesting that: (i) functional integration of the adventitious roots within the whole plant has an adaptive nature in normal development; (ii) salt adaptation results from an integration of the environmental constraint (NaCl) during this developmental readjustment. It is concluded that perturbations generated by emergence of a new organ are the cause of rapid variations in sensitivity required to open a competence window.

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“…It has also been noted as modifying seed response to heat shock in maize (Gong et al 1997) due, probably, to increasing membrane stability (Marschner 1995). Amzallag et al (1997) also reported that leaf malformations in plants exposed to high NaCl concentrations were prevented by the addition of Ca^^ to the nutrient solution.…”

Section: Resultsmentioning

confidence: 99%

Ionic combating mechanisms and their comparative effects on seed hardening under simulated supra-optimal environmental conditions

Kader¹

2003

Journal and Proceedings of the Royal Society of New South Wales

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Heat extremes and limited moisture are two of the most dominant environmental factors impacting stand establishment of rainfed sorghum {Sorghum bicolor L. Moench). Hardening is the process of exposing plants to gradual levels of stress and acclimation to foster better response to post-treatment stress factors. Three experiments were carried out under phytotron and germination cabinet conditions to test the effects of osmotic soaking of sorghum seeds with sodium chloride (NaCl) on germination and growth under simulated heat stress. The hypothesis was that the NaCl treatment forms an acclimation to stress by inducing hormonal responses to ionic toxicity caused by salt. This acclimation would lead to a lowered degree of response when the seed is exposed to future stress; namely, heat and/or drought. Independent variables included NaCl concentration, treatment duration, storage and genotype, whereas germination and growth were dependent variables. Further experiments tested various methods of achieving the initial acclimation "signahng" whilst reducing ionic toxicity through combating ions. Longer soaking treatment durations (2-3 days) and higher NaCl concentrations (16g NaCl P^) were detrimental to germination in comparison to lower concentrations (8g NaCl 1~^) and shorter durations (1 day). An interaction between concentration and duration of treatment existed where high concentrations performed better at lower treatment durations and vice versa. Combining 10 g NaCl 1~^ with 5g calcium sulphate to combat ionic toxicity produced a greater advancement of germination than NaCl alone. Drying duration of seeds did not affect subsequent germination nor did storage for 10 days to 1 month. The effects of osmotic conditioning are discussed and could have potential for improving sorghum success rates in harsh arid environments.

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Leaf malformation during early development in Sorghum. Evidence for an embryonic developmental window

Cited by 8 publications

References 29 publications

Maternal transmission of adaptive modifications in salt‐treated Sorghum bicolor: a first stage in ecotypic differentiation?

Maternal transmission of adaptive modifications in salt‐treated Sorghum bicolor: a first stage in ecotypic differentiation?

Adaptive nature of the transition phases in development: the case of Sorghum bicolor

Ionic combating mechanisms and their comparative effects on seed hardening under simulated supra-optimal environmental conditions

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