Antagonistic action of low-fluence and high-irradiance modes of response of phytochrome on germination and beta-mannanase activity in Datura ferox seeds

Miguel, Lucila de; Bürgin, Maria; Casal, Jorge J.; Sánchez, Rodolfo A.

doi:10.1093/jexbot/51.347.1127

Cited by 21 publications

(15 citation statements)

References 28 publications

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“…The central role of GA metabolism in the promotion of germination by phyB has been well documented in Arabidopsis , in particular the involvement of GA3ox and GA2ox (Yamaguchi & Kamiya, 2002; Cadman et al ., 2006). GA3ox also participates in the promotion of germination by light through the LFR and VLFR in Datura ferox seeds (de Miguel et al ., 2000; Arana et al ., 2007). This study showed that another GA‐related gene, EKO, seems to be controlled by the Pfr of stable phytochromes, as no effect of phyA was detected (Figs 5a, S3).…”

Section: Discussionmentioning

confidence: 99%

Gene expression analysis of light‐modulated germination in tomato seeds

et al. 2009

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Summary• Tomato (Solanum lycopersicum) seed germination can be inhibited by continuous irradiation with far-red light (FRc) and re-induced by a subsequent red light pulse.• In this study, we carried out a global transcript analysis of seeds subjected to FRc inhibitory treatment, with and without a subsequent red light pulse, using potato cDNA microarrays. We also identified and characterized genes involved in lightmodulated germination as elements of the phytochrome signalling pathway.• Microarray data showed that the inhibition of germination by FRc involves the induction of a large number of genes and the repression of a significantly smaller quantity. Multivariate analysis established an underlying pattern of expression dependent on physiological treatment and incubation time, and identified different groups of genes associated with dormancy maintenance, inhibition and promotion of germination. We showed that ELIP, CSN6, SOS2 and RBP are related to the photocontrol of germination. These genes are known to participate in other physiological processes, but their participation in germination has not been suggested previously.• Light quality regulates the tomato seed transcriptome during phytochromemodulated germination through changes in the expression of certain sets of genes. In addition, ELIP and GIGANTEA were confirmed as components of the phytochrome A signalling pathway during FRc inhibition of germination.

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Section: Discussionmentioning

confidence: 99%

Gene expression analysis of light‐modulated germination in tomato seeds

et al. 2009

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“…In many species, prolonged exposure to continuous FR inhibits seed germination (Hendricks et al ; de Miguel et al ; Shichijo et al ; Górski et al ; Batlla & Benech‐Arnold ). In the ecological context, this may be important to prevent germination when under strong canopy shade, where emerging seedlings would have only very limited access to light for photosynthesis and the chance of successful completion of the life cycle would be low (Smith & Whitelam ).…”

Section: Phytochrome A‐mediated Responses and Ecological Relevance Ofmentioning

confidence: 99%

Molecular mechanisms and ecological function of far‐red light signalling

Sheerin

Hiltbrunner

2017

Plant Cell & Environment

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Land plants possess the ability to sense and respond to far-red light (700-760 nm), which serves as an important environmental cue. Due to the nature of far-red light, it is not absorbed by chlorophyll and thus is enriched in canopy shade and will also penetrate deeper into soil than other visible wavelengths. Far-red light responses include regulation of seed germination, suppression of hypocotyl growth, induction of flowering and accumulation of anthocyanins, which depend on one member of the phytochrome photoreceptor family, phytochrome A (phyA). Here, we review the current understanding of the underlying molecular mechanisms of how plants sense far-red light through phyA and the physiological responses to this light quality. Light-activated phytochromes act on two primary pathways within the nucleus; suppression of the E3 ubiquitin ligase complex CUL4/DDB1 and inactivation of the PHYTOCHROME INTERACTING FACTOR (PIF) family of bHLH transcription factors. These pathways integrate with other signal transduction pathways, including phytohormones, for tissue and developmental stage specific responses. Unlike other phytochromes that mediate red-light responses, phyA is transported from the cytoplasm to the nucleus in far-red light by the shuttle proteins FAR-RED ELONGATED HYPOCOTYL 1 (FHY1) and FHY1-LIKE (FHL). However, additional mechanisms must exist that shift the action of phyA to far-red light; current hypotheses are discussed.

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“…a-Galactosidases and b-mannosidases contribute to seed galactomannan degradation (Bewley, 1997;Feurtado et al, 2001;Nonogaki et al, 2007), and bmannosidase enzyme activity has been detected in the micropylar endosperm of tomato seeds, Datura, and coffee (de Miguel et al, 2000;Mo and Bewley, 2002;da Silva et al, 2005). In Arabidopsis seeds, At3g18080 b-mannosidase transcripts accumulate mainly in embryo and At3g57520 a-galactosidase transcripts were abundant between 3 and 24 h in whole seeds (Nakabayashi et al, 2005;Penfield et al, 2006;Preston et al, 2009).…”

Section: Mannansmentioning

confidence: 99%

Regulation of Seed Germination in the Close Arabidopsis RelativeLepidium sativum: A Global Tissue-Specific Transcript Analysis

Morris

Linkies²,

Müller³

et al. 2011

Plant Physiology

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The completion of germination in Lepidium sativum and other endospermic seeds (e.g. Arabidopsis [Arabidopsis thaliana]) is regulated by two opposing forces, the growth potential of the radicle (RAD) and the resistance to this growth from the micropylar endosperm cap (CAP) surrounding it. We show by puncture force measurement that the CAP progressively weakens during germination, and we have conducted a time-course transcript analysis of RAD and CAP tissues throughout this process. We have also used specific inhibitors to investigate the importance of transcription, translation, and posttranslation levels of regulation of endosperm weakening in isolated CAPs. Although the impact of inhibiting translation is greater, both transcription and translation are required for the completion of endosperm weakening in the whole seed population. The majority of genes expressed during this process occur in both tissues, but where they are uniquely expressed, or significantly differentially expressed between tissues, this relates to the functions of the RAD as growing tissue and the CAP as a regulator of germination through weakening. More detailed analysis showed that putative orthologs of cell wallremodeling genes are expressed in a complex manner during CAP weakening, suggesting distinct roles in the RAD and CAP. Expression patterns are also consistent with the CAP being a receptor for environmental signals influencing germination. Inhibitors of the aspartic, serine, and cysteine proteases reduced the number of isolated CAPs in which weakening developed, and inhibition of the 26S proteasome resulted in its complete cessation. This indicates that targeted protein degradation is a major control point for endosperm weakening.

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Antagonistic action of low-fluence and high-irradiance modes of response of phytochrome on germination and beta-mannanase activity in Datura ferox seeds

Cited by 21 publications

References 28 publications

Gene expression analysis of light‐modulated germination in tomato seeds

Gene expression analysis of light‐modulated germination in tomato seeds

Molecular mechanisms and ecological function of far‐red light signalling

Regulation of Seed Germination in the Close Arabidopsis RelativeLepidium sativum: A Global Tissue-Specific Transcript Analysis

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