Cell division versus cell elongation: The control of radicle elongation during thermoinhibition of Tagetes minuta achenes

Taylor, N. J.; Hills, P.N.; Staden, J. Van

doi:10.1016/j.jplph.2006.11.008

Cited by 8 publications

(8 citation statements)

References 58 publications

(73 reference statements)

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“…However, while the majority of ungerminated seeds at high temperature appeared on squashing to have healthy and intact embryos, it is possible that the high temperature exposure would have induced physiological changes in the seed which may have rendered them non-viable. High temperature exposure during germination has been shown to cause damage to metabolic functions such as protein denaturation, reduced enzyme function, membrane damage, alteration of energy metabolism, DNA synthesis and leakage of electrolytes and potassium (Bewley and Black 1994;Corbineau et al 2002;Taylor et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Genetic control of Eucalyptus globulus seed germination

Rix

Gracie

Potts

et al. 2015

Annals of Forest Science

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Abstract& Key message The maternal genotype has a significant effect on most germination traits of Eucalyptus globulus seeds. These differences can be partly explained by genetic-based differences amongst races, including differences in sensitivity to high temperatures which may be of adaptive significance. & Context Slow and uneven germination of Eucalyptus globulus seeds in commercial nurseries can be a problem which has been linked with periods of high temperature. & Aims This study aimed to determine whether maternal genotype affects the germination of E. globulus seeds.& Methods By sampling seeds over two seasons from multiple randomised ramets (trees) of maternal genotypes from three races of E. globulus growing in a seed orchard, the extent of genetic control of seed germination responses was assessed at different germination temperatures. & Results Maternal genotype had a significant effect on most germination traits but a differential response to temperature was more evident for germination proportion than rate traits. Maternal races differed in their rate of seedling development regardless of temperature, but differences in the germination proportion were only detected at high temperatures. & Conclusion The present study highlights the potential adaptive significance of the germination response and the need for seed lot-specific germination testing as both genetics and maternal environment vary.

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Section: Discussionmentioning

confidence: 99%

Genetic control of Eucalyptus globulus seed germination

Rix

Gracie

Potts

et al. 2015

Annals of Forest Science

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“…For example, there is no cell division during radicle elongation in lettuce, cabbage and maize while cell division occurs prior to radicle emergence in tomato, tobacco and Arabidopsis (cited in Taylor et al, 2007). Analysis of the radicle tip of T. minuta using flow cytometry revealed that the majority of the cells are in the G 1 phase in the dry achenes.…”

Section: Discussionmentioning

confidence: 99%

“…Following imbibition at 25 • C, the cells progressed through the G 2 phase and underwent mitosis prior to radicle emergence. In thermoinhibited achenes, the cells in the radicle tip underwent DNA replication but were arrested in the G 2 phase and only underwent mitosis when transferred to 25 • C. However, application of various cell cycle and cell elongation inhibitors revealed that although DNA replication occurred prior to radicle emergence, radicle emergence was due to cell elongation rather than cell division with cell elongation being inhibited at higher temperatures (Taylor et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

“…A corresponding increase in tZOG (Tables 1 and 2) suggests that there is precise regulation of tZ levels. Low iP concentrations in the thermoinhibited achenes may be preventing the completion of the cell cycle with cells arrested in the G 2 phase (Taylor et al, 2007). Taylor et al (2007) suggested that DNA synthesis in thermoinhibited achenes is important for protection of the achenes at supra-optimal temperatures and thus, biosynthesis of tZ to initiate cell division and DNA synthesis and the disruption of iP biosynthesis in the thermoinhibited achenes may represent a heat stress mechanism in T. minuta.…”

Section: Discussionmentioning

confidence: 99%

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Comparison of endogenous cytokinins and cytokinin oxidase/dehydrogenase activity in germinating and thermoinhibited Tagetes minuta achenes

Stirk¹,

Novák²,

Žižková³

et al. 2012

Journal of Plant Physiology

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“…Previous studies have shown that mannitol is a potent inhibitor of cell elongation growth in germinating plant seeds [40]. Orthovanadate (Na 3 VO 4 ) and diethylstilbestrol (DES) have been found to inhibit cell elongation during seed germination by inhibiting plasmalemma H + -ATPase in both monocotyledonous and dicotyledonous plants [41], [42].…”

Section: Resultsmentioning

confidence: 99%

HRS1 Acts as a Negative Regulator of Abscisic Acid Signaling to Promote Timely Germination of Arabidopsis Seeds

Feng

Wang

et al. 2012

PLoS ONE

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In this work, we conducted functional analysis of Arabidopsis HRS1 gene in order to provide new insights into the mechanisms governing seed germination. Compared with wild type (WT) control, HRS1 knockout mutant (hrs1-1) exhibited significant germination delays on either normal medium or those supplemented with abscisic acid (ABA) or sodium chloride (NaCl), with the magnitude of the delay being substantially larger on the latter media. The hypersensitivity of hrs1-1 germination to ABA and NaCl required ABI3, ABI4 and ABI5, and was aggravated in the double mutant hrs1-1abi1-2 and triple mutant hrs1-1hab1-1abi1-2, indicating that HRS1 acts as a negative regulator of ABA signaling during seed germination. Consistent with this notion, HRS1 expression was found in the embryo axis, and was regulated both temporally and spatially, during seed germination. Further analysis showed that the delay of hrs1-1 germination under normal conditions was associated with reduction in the elongation of the cells located in the lower hypocotyl (LH) and transition zone (TZ) of embryo axis. Interestingly, the germination rate of hrs1-1 was more severely reduced by the inhibitor of cell elongation, and more significantly decreased by the suppressors of plasmalemma H+-ATPase activity, than that of WT control. The plasmalemma H+-ATPase activity in the germinating seeds of hrs1-1 was substantially lower than that exhibited by WT control, and fusicoccin, an activator of this pump, corrected the transient germination delay of hrs1-1. Together, our data suggest that HRS1 may be needed for suppressing ABA signaling in germinating embryo axis, which promotes the timely germination of Arabidopsis seeds probably by facilitating the proper function of plasmalemma H+-ATPase and the efficient elongation of LH and TZ cells.

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Cell division versus cell elongation: The control of radicle elongation during thermoinhibition of Tagetes minuta achenes

Cited by 8 publications

References 58 publications

Genetic control of Eucalyptus globulus seed germination

Genetic control of Eucalyptus globulus seed germination

Comparison of endogenous cytokinins and cytokinin oxidase/dehydrogenase activity in germinating and thermoinhibited Tagetes minuta achenes

HRS1 Acts as a Negative Regulator of Abscisic Acid Signaling to Promote Timely Germination of Arabidopsis Seeds

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