Long-distance ABA transport can mediate distal tissue responses by affecting local ABA concentrations

Environmental stresses that perturb plant Hwater relations influence abscisic acid(ABA) concentrations, but it is unclear whether long-distance ABA transport contributes to changes in local ABA levels. To determine the physiological relevance of ABA transport, we made reciprocal-and self-grafts of ABA-deficient flacca mutant and wild-type(WT) tomato plants, in which low phosphorus(P) conditions decreased ABA concentrations while salinity increased ABA concentrations. Whereas foliar ABA concentrations in the WT scions were rootstock independent under control conditions, salinity resulted in long-distance transport of ABA: flacca scions had approximately twice as much ABA when grafted on WT rootstocks compared to flacca rootstocks. Root ABA concentrations were scion dependent: both WT and flacca rootstocks had less ABA with the flacca mutant scion than with the WT scion under control conditions. In WT scions, whereas rootstock genotype had limited effects on stomatal conductance under control conditions, a flacca rootstock decreased leaf area of stressed plants, presumably due to attenuated root-to-shoot ABA transport. In flacca scions, a WT rootstock decreased stomatal conductance but increased leaf area of stressed plants, likely due to enhanced root-to-shoot ABA transport. Thus, long-distance ABA transport can affect responses in distal tissues by changing local ABA concentrations.

Remembering,Forgetting,and Absencing Disasters in the Post-disaster Recovery Process

Sustainable post-disaster recovery implies learning from past experience in order to prevent recreating forms of vulnerability.Memory construction supports both the healing process and redevelopment plans.Hence,memory of disaster results from the balance between remembering,forgetting,and absencing elements of the disaster,and can be both a tool and an obstacle to sustainable recovery.We explore here how collective memory is built in a post-disaster context to respond to the needs of this critical period,and how it shapes recovery.This ethnographic study,conducted between 2015 and 2017,explores the recovery processes in Montserrat,a small Caribbean island affected by an extended volcanic crisis from 1995 to 2010.Although this study does not give tangible solutions for disaster risk reduction in a post-disaster context,it highlights potential obstacles for learning from a disaster and how they may be surmounted.We argue that it is crucial to acknowledge evolving collective memory in order to implement effective measures for preserving and sharing a shared understanding of disaster across generations and social groups in a way that supports disaster risk awareness.We also maintain that acknowledging the dilemma faced by authorities and disaster management agencies during a period of conflicting needs may encourage the reconsideration of risk framing,and hence reveal how to improve implementation of disaster risk reduction measures.

Evaluating indicators of human well-being for ecosystem-based management

Introduction:Interrelated social and ecological challenges demand an understanding of how environmental change and management decisions affect human well-being.This paper out-lines a framework for measuring human well-being for ecosystem-based management(EBM).We present a prototype that can be adapted and developed for various scales and contexts.Scientists and managers use indicators to assess status and trends in integrated ecosystem assessments(IEAs).To improve the social science rigor and success of EBM,we developed a systematic and transparent approach for evaluating indicators of human well-being for an IEA.Methods:Our process is based on a comprehensive conceptualization of human well-being,a scalable analysis of management priorities,and a set of indicator screening criteria tailored to the needs of EBM.We tested our approach by evaluating more than 2000 existing social indicators related to ocean and coastal management of the US West Coast.We focused on two foundational attributes of human well-being:resource access and self-determination.Outcomes and Discussion:Our results suggest that existing indicators and data are limited in their ability to reflect linkages between environmental change and human well-being,and extremely limited in their ability to assess social equity and justice.We reveal a critical need for new social indicators tailored to answer environmental questions and new data that are disaggregated by social variables to measure equity.In both,we stress the importance of collaborating with the people whose well-being is to be assessed.Conclusion:Our framework is designed to encourage governments and communities to carefully assess the complex tradeoffs inherent in environmental decision-making.