In plants, recent studies have demonstrated links between the regulation of developmental processes and chromatin dynamics organisation. Analysis new mutations affecting overall plant architecture, leaf development flowering time in Arabidopsis has allowed us to clone characterise LHP1, Drosophila heterochromatin protein 1 (HP1) homologue. LHP1 chromo shadow domains central function animal proteins. Yeast two hybrid planta deletion experiments suggest similar modes action plants animals via...

The Tntl retrotransposon was isolated from tobacco after transposition.Tntl expression is very low at the plant level and under most stress condlUons but strongly induced during protoplast Isolation.It shown here that tranecription of ratrotreneposon can be activated by several microbial factors having common ability to elicit a hypersensitive response in tobacco.These elicitore Include Onozuka crude extracts fungus Trlchoderma v/ride, ellcitins purified Phytophthora fungsl species culture...

Light and substrate regulation of nitrate reductase (NR) expression were compared in wild type mutant lines Nicotiana plumbaginifolia. Mutants affected the NR structural gene (nia) or biosynthesis molybdenum cofactor (cnx) examined. nia mutants expressing a defective apoenzyme, as well cnx mutants, overexpressed mRNA, whereas devoid detectable protein had reduced undetectable mRNA levels. Diurnal fluctuations specifically abolished suggesting that integrity catalytic activity is required for...

ABSTRACT The mechanisms that establish the floral meristem are now becoming clearer, but way in which flowering is maintained less well understood. Impatiens balsamina provides a unique opportunity to address this question because reversion vegetative growth can be obtained predictable by transferring plants from inductive non-inductive conditions. Following increasing amounts of induction, takes place at progressively later stages flower development. Partial induction and defoliation...

Reproductive phase change in Arabidopsis thaliana is characterized by the floral transition (initiation of first flower) and bolting (elongation internode). Here, relationship between these transitions examined comparing variation cauline total leaf numbers wild-type plants 49 early-flowering mutants under a wide range photoperiods. The timing was also evaluated subjecting to photoperiodic perturbations at different developmental stages. Coupling altered wild type non-optimal flowering...

Abstract Flowering time, the major regulatory transition of plant sequential development, is modulated by multiple endogenous and environmental factors. By phenotypic profiling 80 early flowering mutants Arabidopsis, we examine how mutational reduction floral repression associated with changes in plasticity stability. time measurements reveal deviations from linear relationship between number leaves days to bolting described for natural accessions late mutants. The correspond relative...

Light and substrate regulation of nitrate reductase (NR) expression were compared in wild type mutant lines Nicotiana plumbaginifolia.Mutants affected the NR structural gene (nia) or biosynthesis molybdenum cofactor (cnx) examined.nia mutants expressing a defective apoenzyme, as well cnx mutants, overexpressed mRNA, whereas nia devoid detectable protein had reduced undetectable mRNA levels.Diurna1 fluctuations specifically abolished suggesting that integrity catalytic activity is required...

Many plant species exhibit seasonal variation of flowering time in response to daylength. Arabidopsis (Arabidopsis thaliana) flowers earlier under long days (LDs) than short (SDs). This quantitative photoperiod is characterized by two parameters, the critical (Pc), below which there a delay flowering, and ceiling (Pce), no further delay. Thus Pc Pce define thresholds beyond maximum LD SD responses are observed, respectively. We studied 49 mutants selected for early SDs. Nine these exhibited...

Background and AimsReproductive phase change in Arabidopsis thaliana is characterized by two transitions phytomer identity, the differentiation of first elongate internode (bolting transition) flower (floral transition). An evaluation dynamics these was sought examining precision corresponding identity changes.

Abstract We analyzed the process of inflorescence formation in Impatiens balsamina by studying architecture plant under different photoperiod treatments. Floral reversion noninductive conditions this species is caused lack persistence induced state leaf. This can be used to control amount inductive signal and examine its quantitative influence on morphological changes plant. The floral transition was characterized a continuum variation at level meristem identity, primordium initiation, organ...

• Floral meristems are generally determinate. Termination of their activity varies with species, occurring after carpel or ovule development, depending on the placentation type. In terminal flowering Impatiens balsamina (cv. Dwarf Bush Flowered) some flowers exhibit meristem indeterminacy; they produce organs from placenta development. Here we provide a detailed description gynoecium development in this line and explore basis indeterminate nature its floral meristems. We find that is...

Developmental dynamics can be influenced by external and endogenous factors in a more or less analogous manner. To compare the phenotypic effects of (i) environmental [i.e. standard (stPhP) extended (exPhP) photoperiods] changes Arabidopsis wild types (ii) genetic variation eav1–eav61 early flowering mutants, two temporal indicators were analysed, time to bolting (DtB) number leaves (TLN). It was found that DtB TLN are differentially affected different contexts, some dynamic convergence...

Summary Flowering and reversion in Impatiens are characterised by gradual transitions of organ identity constitute a unique system for the molecular physiological study floral organogenesis. The authors have isolated an homologue FIM gene Antirrhinum ( UFO Arabidopsis ), Imp‐FIM , analysed its expression three states terminal meristem: vegetative, floral, reverted. In meristems, transcription is associated with petal identity, as but this achieved through novel pattern, high level transcript...

Purple-flowered plants of Impatiens balsamina maintained floral development on transfer from inductive short days (SD) to long (LD), a treatment in which red-flowered are known revert leaf production. An investigation into the nonreverting nature purple-flowered was carried out establish whether these achieved meristem commitment or their non-reverting state controlled by leaves. When leaves that had unfolded during SD were removed at time LD, purpleflowered did revert. This result suggests...

The claim that environmental virtue ethics (EVE) is anthropocentric appears inherently aporetic since it implies either anthropocentrism virtuous or the whole issue anthropocentric, thus translating vices into virtues vice versa. Another interpretation both environment and humanity are thought with a vicious conception of centeredness. Conversely, if centeredness rightly addressed its considered as one same issue, focus on should also be different. By drawing Felix Guatttari’s ecosophy, this...