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Biology subjects

Duarte, G. T.

Publications and source records attributed to Duarte, G. T..

2 recordsLinked to original sources

Unveiling the benefits and gaps of wild pollinators on nutrition and income

Insect pollinators play a crucial role in global crop production, enhancing fruit and seed yield, improving fruit quality, and increasing crop nutritional value. However, wild pollinator populations worldwide have been experiencing alarming declines. This study investigates the contribution of wild pollinators to nutrition and farmers income in Canada, while examining the spatial distribution of these services. Using publicly available data on crop types, yields, nutrient content, and farm gate values, alongside information on natural habitats, we estimated the benefits of wild pollinators across national agricultural landscapes. Our findings reveal that these pollinators sustain approximately 24.4 million equivalent people each year in terms of nutrition and generate an annual income of nearly CAD$2.8 billion for farmers. However, significant benefit gaps exist due to the lack of nearby pollinator habitats and insufficient pollination of dependent crops on a national scale. Addressing these gaps could provide an additional nutrition supply for nearly 30 million equivalent people and increase farmer income by CAD$3 billion. We discuss how and where efforts focused on preserving and enhancing wild pollinator habitats, promoting sustainable farming practices, and raising awareness among stakeholders are crucial for the long-term viability of wild pollinator populations and the sustainability of agricultural systems. This research underscores the urgent need for a national strategy aimed at safeguarding wild pollinators. Implementing such a strategy would not only contribute to strengthening local economies in the regions highlighted in our work but also ensure the production of nutritionally essential food.

ecology↗

Regulation of PYR/PYL/RCAR ABA receptors mRNA stability: involvement of miR5628 in decay of PYL6 mRNA

Hormone signaling fine-tuning involves feedback regulatory loops. Abscisic acid (ABA) plays key functions in development and tolerance to abiotic stress. ABA is sensed by the PYR/PYL/RCAR receptors and it also represses their gene expression. Conversely, ABA induces PP2C phosphatases expression, which are negative regulators of the ABA signaling pathway. This feedback regulatory scheme is likely important for the modulation of ABA signal transduction. Here, we provide a new insight into the mechanisms underlying the ABA-induced negative control of PYR/PYL/RCAR expression in Arabidopsis thaliana. The strong and sustained repression of PYR/PYL/RCARs revealed by ABA time course treatment defines the regulation of receptors genes as an important step in resetting the ABA signaling pathway. Transcription inhibition by cordycepin showed that destabilization of PYL1/4/5/6 mRNA is involved in ABA-induced repression of these genes. Furthermore, genetic evidence indicated that decapping may play a role in PYL4/5/6 mRNAs decay. In addition, we provide evidence that the Arabidopsis-specific microRNA5628 (miR5628), which is transiently induced by the ABA core signaling pathway, guides the cleavage of PYL6 transcript in response to ABA. After cleavage, the resulting RISC 5- and 3-cleaved fragments of PYL6 mRNA may be degraded by exoribonuclease XRN4. MiR5628 is an evolutionary novelty that may contribute, with decapping and XRN4 activities, to enhance PYL6 mRNA degradation. Thus, control of stability of PYR/PYL/RCAR transcripts is an important step in maintaining homeostasis of ABA signaling. One Sentence SummaryAttenuation of ABA signaling involves destabilization of PYL1/4/5/6 transcripts. ABA core signaling induces miR5628 expression to enhance PYL6 mRNA degradation in conjunction with decapping and XRN4 activities.

plant biology↗