Effect of light and its interaction with nitrate and ammonium ions in seed germination of <i>Caesulia axillaris</i>

Singh, B. P.; Amritphale, Dilip

doi:10.1111/j.1399-3054.1992.tb05261.x

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…Both N forms are known to break seed dormancy but germination effects will be species specific as not all species are stimulated, some only respond to NO 3 À or NH 4 þ , and responses may be both positive and negative (e.g. Singh and Amritphale, 1992;Dorland et al, 2003;Luna and Moreno, 2009).…”

Section: Variation In Plant Tolerance To Nh Xmentioning

confidence: 99%

Ecosystem responses to reduced and oxidised nitrogen inputs in European terrestrial habitats

Stevens

Manning

Berg

et al. 2011

Environmental Pollution

144

108

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While it is well established that ecosystems display strong responses to elevated nitrogen deposition, the importance of the ratio between the dominant forms of deposited nitrogen (NH(x) and NO(y)) in determining ecosystem response is poorly understood. As large changes in the ratio of oxidised and reduced nitrogen inputs are occurring, this oversight requires attention. One reason for this knowledge gap is that plants experience a different NH(x):NO(y) ratio in soil to that seen in atmospheric deposits because atmospheric inputs are modified by soil transformations, mediated by soil pH. Consequently species of neutral and alkaline habitats are less likely to encounter high NH(4)(+) concentrations than species from acid soils. We suggest that the response of vascular plant species to changing ratios of NH(x):NO(y) deposits will be driven primarily by a combination of soil pH and nitrification rates. Testing this hypothesis requires a combination of experimental and survey work in a range of systems.

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Section: Variation In Plant Tolerance To Nh Xmentioning

confidence: 99%

Ecosystem responses to reduced and oxidised nitrogen inputs in European terrestrial habitats

Stevens

Manning

Berg

et al. 2011

Environmental Pollution

144

108

View full text Add to dashboard Cite

show abstract

“…The stimulative actions of light and nitrate often interact in the germination of seeds (e.g. Vincent & Roberts 1979;Probert, Gajjar & Haslam 1987;Grubi^ic & Konjevic 1990;Singh & Amritphale 1992) and in fern spores (Haas & Scheuerlein 1990). It has been shown in several species that light requirement of seeds changes during alterations in dormancy (Taylorson 1970(Taylorson , 1972.…”

Section: Introductionmentioning

confidence: 99%

Changing sensitivity to light and nitrate but not to gibberellins regulates seasonal dormancy patterns in Sisymbrium officinale seeds

Derkx

Karssen

1993

Plant Cell & Environment

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Seeds of Sisymbrium officinale (L.) Scop, that are buried under natural conditions in soil pass annually through a seasonal pattern of changes in dormancy. Dormancy is broken in autumn-winter and re-induced in summer. To elucidate dormancy regulation in this species under natural conditions, a detailed analysis of the changes in sensitivity to some relevant germination factors was carried out Germination data fitted as logistic dose response curves showed that sensitivity to light and nitrate, both indispensable stimuli for germination of this species, varied with the seasons. Patterns of shifts in requirement for light and nitrate were remarkably similar. Sensitivity increased when both primary and secondary dormancy were alleviated, and it was reversed during induction of secondary dormancy. During alleviation of primary dormancy in spring 1991, the fluence response curves exhibited a biphasic character with responses occurring both in the very-Iow-flueuce-range and in the low-fluence-range. The nitrate dose response data could all be fitted as monophasic curves, although responses might have occurred in two distinct ranges as well. From interpretation of curve parameters, it is postulated that dormancy is regulated by changes in the number of phytochrome and nitrate receptors, in shifts in the hinding characteristics of the receptors and/or in shifts in the response chain initiated by the ligand-receptor interaction. Somewhere in this response chain, biosynthesis of gibbereiiins (GAs) is stimulated. By use of the GA biosynthesis inhibitor tetcyclasis, * it was indirectly proven that the capacity to synthesize GAs indeed varied with the seasons. Sensitivity to GAs gradually increased from burial onwards and was not particularly related to changes in dormancy. Thus, except for the first few months of burial, GA sensitivity may not be regarded as a limiting factor in controlling dormancy in this species.

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Effects of Chilling, Light and Nitrogen-containing Compounds on Germination, Rate of Germination and Seed Imbibition ofClematis vitalbaL.

1997

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Effect of light and its interaction with nitrate and ammonium ions in seed germination of Caesulia axillaris

Cited by 8 publications

References 19 publications

Ecosystem responses to reduced and oxidised nitrogen inputs in European terrestrial habitats

Ecosystem responses to reduced and oxidised nitrogen inputs in European terrestrial habitats

Changing sensitivity to light and nitrate but not to gibberellins regulates seasonal dormancy patterns in Sisymbrium officinale seeds

Effects of Chilling, Light and Nitrogen-containing Compounds on Germination, Rate of Germination and Seed Imbibition ofClematis vitalbaL.

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