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Response to extended drought stress and recovery involve epigenetic control of stress adaptation and flowering regulation in Zea mays

ABSTRACT: Response to extended drought stress and recovery involve epigenetic control of stress adaptation and flowering regulation in Zea mays

PROVIDER: PRJNA526032 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8696240.fastq.gz	Fastqsanger.gz
	SRR8696250.fastq.gz	Fastqsanger.gz
	SRR8696241.fastq.gz	Fastqsanger.gz
	SRR8696251.fastq.gz	Fastqsanger.gz
	SRR8696242.fastq.gz	Fastqsanger.gz

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Response to extended drought stress and recovery involve epigenetic control of stress adaptation and flowering regulation in Zea mays

Project description:During their lifespan, plants continuously respond to a multitude of stressful factors that affects their development and reproductive fitness through a sophisticated variety of physiological, biochemical, transcriptional, and epigenetic mechanisms. Dynamic changes in chromatin structure and concomitant transcriptional variations play an important role in both stress response and adaptation. Epigenetic memory mechanisms seem to be involved because chromatin and expression patterns can be indeed stably maintained during cell division, once the triggering stimulus has been removed. In this study we performed transcriptome and genome-wide analysis of histone modifications of maize plants subjected to a mild and prolonged drought stress followed by a complete recovery phase. Results led to the identification of stress-responsive genes in which variations in transcript and/or histone modification levels persist after stress removal. Genes not showing an immediate response to stress, but perceiving and storing stress signal for a delayed response were also identified. This provides valuable information about genes and mechanisms utilized by plants to adapt to stressful environment and potentially involved in stress memory. We also report that drought stress alters flowering and inflorescences patterning, possibly by affecting expression and chromatin of flowering regulatory genes.

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Transient drought during flowering initiation modifies the grain proteome of bread winter wheat

Project description:Drought is among the most limiting factors for sustainable agricultural production. Water shortage at the onset of flowering severely affects the quality and quantity of grain yield of bread wheat (Triticum aestivum). Herein, we measured oxidative stress and photosynthesis-related parameters upon applying transient drought on contrasting wheat cultivars at the flowering initiation stage of ontogenesis. The sensitive cultivar showed ineffective water management and a more severe decline of photosynthesis. Apparently, the tolerant genotype used photorespiration to dissipate excessive light energy. The tolerant cultivar sooner induced superoxide dismutase and showed less inhibited photosynthesis. Such protective effect resulted in less affected yield and spectrum of seed proteome. The tolerant cultivar had a more stable gluten profile, which defines bread-making quality, upon drought. Drought caused the accumulation of medically relevant proteins: (i) components of gluten in the sensitive cultivar and (ii) metabolic proteins in the tolerant cultivar. We propose specific proteins as markers of drought tolerance for guiding efficient breeding: thaumatin-like protein, 14-3-3 protein, peroxiredoxins, peroxidase, FBD domain protein, and Ap2/ERF plus B3 domain protein.

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Mexican maize landraces under drought stress and recovery irrigation

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Hd3a, RFT1 and Ehd1 integrate photoperiodic and drought stress signals to delay the floral transition in rice

Project description:Plants show a high degree of developmental plasticity in response to external cues, including day length and environmental stress. Water scarcity in particular can interfere with photoperiodic flowering, resulting in the acceleration of the switch to reproductive growth in several species, a process called drought escape. However, other strategies are possible and drought stress can also delay flowering, albeit the underlying mechanisms have never been addressed at the molecular level. We investigated these interactions in rice, a short day species in which drought stress delays flowering. A protocol that allows the synchronization of drought with the floral transition was set up to profile the transcriptome of leaves subjected to stress under distinct photoperiods. We identified clusters of genes that responded to drought differently depending on day length. Exposure to drought stress under floral-inductive photoperiods strongly reduced transcription of EARLY HEADING DATE 1 (Ehd1), HEADING DATE 3a (Hd3a) and RICE FLOWERING LOCUS T 1 (RFT1), primary integrators of day length signals, providing a molecular connection between stress and the photoperiodic pathway. However, phenotypic and transcriptional analyses suggested that OsGIGANTEA (OsGI) does not integrate drought and photoperiodic signals as in Arabidopsis, highlighting molecular differences between between long and short day model species.

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