Environmental factors affecting flowering of rice flower (Ozothamnus diosmifolius, Vent.)

Halevy, A. H.; Shlomo, Eitan; Shvartz, Michal

doi:10.1016/s0304-4238(00)00182-5

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…These observations are consistent with other studies, where it has been shown in wheat and barley that increased temperature in SD conditions does not promote floral initiation, but in fact delays the onset of reproductive development [46,47]. Similarly, in strawberry, olive, rice flowers, perennial grasses and orchids moderately high temperatures delay or completely inhibit floral induction [44,45,48-50]. Taken together, these observations suggest that some plants, including annual temperate grasses such as Brachypodium , have adopted different strategies to respond to increased ambient temperature compared to Arabidopsis , where flowering is accelerated by high temperature.…”

Section: Discussionsupporting

confidence: 90%

Thermal stress effects on grain yield in Brachypodium distachyon occur via H2A.Z-nucleosomes

et al. 2013

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BackgroundCrop plants are highly sensitive to ambient temperature, with a 1 ºC difference in temperature sufficient to affect development and yield. Monocot crop plants are particularly vulnerable to higher temperatures during the reproductive and grain-filling phases. The molecular mechanisms by which temperature influences grain development are, however, unknown. In Arabidopsis thaliana, H2A.Z-nucleosomes coordinate transcriptional responses to higher temperature. We therefore investigated whether the effects of high temperature on grain development are mediated by H2A.Z-nucleosomes.ResultsWe have analyzed the thermal responses of the Pooid grass, Brachypodium distachyon, a model system for crops. We find that H2A.Z-nucleosome occupancy is more responsive to increases in ambient temperature in the reproductive tissue of developing grains compared withvegetative seedlings. This difference correlates with strong phenotypic responses of developing grain to increased temperature, including early maturity and reduced yield. Conversely, temperature has limited impact on the timing of transition from the vegetative to generative stage, with increased temperature unable to substitute for long photoperiod induction of flowering. RNAi silencing of components necessary for H2A.Z-nucleosome deposition is sufficient to phenocopythe effects of warmer temperature on grain development.ConclusionsH2A.Z-nucleosomes are important in coordinating the sensitivity of temperate grasses to increased temperature during grain development. Perturbing H2A.Z occupancy, through higher temperature or genetically, strongly reduces yield. Thus, we provide a molecular understanding of the pathways through which high temperature impacts on yield. These findings may be useful for breeding crops resilient to thermal stress.

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Section: Discussionsupporting

confidence: 90%

Thermal stress effects on grain yield in Brachypodium distachyon occur via H2A.Z-nucleosomes

et al. 2013

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“…Consequently, daily and accumulated sunlight hours are directly related to photoperiod. Significant correlations between photoperiod and temperature have been described by several authors for different species (Roche et al 1999;Halevy et al 2001). The rice flower (Ozothamnus diosmifolius Vent.)…”

Section: Discussionmentioning

confidence: 95%

“…The rice flower (Ozothamnus diosmifolius Vent.) and the pea (Pisum sativum L.) were studied by Halevy et al (2001) and Roche et al (1999), respectively, in Mediterranean conditions. In both studies, when high temperatures were reached, the photoperiod had a significant effect on floral initiation and flowering (i.e.…”

Section: Discussionmentioning

confidence: 99%

Influence of meteorological parameters on olea pollen concentrations in C�rdoba (South-western Spain)

Vázquez¹,

Galán²,

Domínguez-Vilches³

2003

International Journal of Biometeorology

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The influence of meteorological parameters on the dispersion of airborne pollen has been studied by several authors. Olive pollen is the major cause of allergy in southern Spain, where a large part of the arable surface area is given over to olive cultivation. Daily pollen forecasts provide important information both for pollen-allergy sufferers and for agronomists trying to achieve a better biological understanding of variations in airborne olive pollen levels. The main purpose of this paper is to study, by means of short-term statistical analysis, the effect of meteorological parameters on airborne olive pollen concentrations in the city of Cordoba (south-western Spain). Twenty-one-year (1982-2002) aerobiological and meteorological databases were used. Correlation and multiple regression analyses were used to study the relationships between olive pollen levels and several meteorological parameters. Statistical analysis was applied both to the whole pollen season and to the pre-peak period. Daily meteorological parameters, such as accumulated mean temperature, accumulated sunlight hours, and accumulated rainfall were used as independent variables in both statistical analyses. Accumulated meteorological variables were of the greatest value in most regression analysis equations, heat-related variables being the most important.

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“…There are also examples such as Arabidopsis Gy‐0 accession that reacts similarly to Arabidopsis Col , the main laboratory accession, regarding hypocotyl elongation, but shows a delay in flowering time when grown at 28°C (Verhage et al ., ). High temperature also delays flowering in cauliflower ( Brassica oleraceae ) (Verhage et al ., ), rice flower bush (Halevy et al ., ), olive trees (Haberman et al ., ) and some orchids (Newton and Runkle, ). Flowering time retardation by warm ambient temperature, as well as low temperature induction of FT‐ like genes, have been also described in mandarin (Nishikawa et al ., ), chrysanthemum (Nakano et al ., ) and litchi (Ding et al ., ).…”

Section: Discussionmentioning

confidence: 99%

High ambient temperature leads to reduced FT expression and delayed flowering in Brassica rapa via a mechanism associated with H2A.Z dynamics

et al. 2019

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Flowering time is a relevant agronomic trait because is crucial for the optimal formation of seeds and fruits. The genetic pathways controlling this developmental phase transition have been studied extensively in Arabidopsis thaliana. These pathways converge in a small number of genes including FT, the so-called florigen, which integrates environmental cues like ambient temperature. Nevertheless, detailed and functional studies about flowering time in Brassica crops are scarce. Here we study the role of the FT Brassica rapa homologues and the effect of high ambient temperature on flowering time in this crop. Phenotypic characterization and gene-expression analyses suggest that BraA.FT.a (BraA02g016700.3C) is decisive for initiating floral transition; consequently, braA.ft.a loss-of-function and hypomorphic mutations result in late flowering phenotypes. We also show that high ambient temperature delays B. rapa floral transition by reducing BraA.FT.a expression. Strikingly, these expression changes are associated with increased histone H2A.Z levels and less accessible chromatin configuration of the BraA.FT.a locus at high ambient temperature. Interestingly, increased H2A.Z levels at high ambient temperature were also observed for other B. rapa temperature-responsive genes. Previous reports delimited that Arabidopsis flowers earlier at high ambient temperature due to reduced H2A.Z incorporation in the FT locus. Our data reveal a conserved chromatin-mediated mechanism in B. rapa and Arabidopsis in which the incorporation of H2A.Z at FT chromatin in response to warm ambient temperature results in different flowering time responses. This work will help to develop improved Brassica crop varieties with flowering time requirements to cope with global warming.

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Environmental factors affecting flowering of rice flower (Ozothamnus diosmifolius, Vent.)

Cited by 8 publications

References 5 publications

Thermal stress effects on grain yield in Brachypodium distachyon occur via H2A.Z-nucleosomes

Thermal stress effects on grain yield in Brachypodium distachyon occur via H2A.Z-nucleosomes

Influence of meteorological parameters on olea pollen concentrations in C�rdoba (South-western Spain)

High ambient temperature leads to reduced FT expression and delayed flowering in Brassica rapa via a mechanism associated with H2A.Z dynamics

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