Combined high leaf hydraulic safety and efficiency provides drought tolerance in Caragana species adapted to low mean annual precipitation.

New Phytol · 2021 · PMC7754512 · PMID 32749703

Europe PMC DOI

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a negative trendno p-value reported

A negative trend instead between hydraulic safety and efficiency has been reported in many studies.

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a positive trendno p-value reported

A positive trend between hydraulic safety and efficiency, such as that observed here across Caragana species, can be surprising at first glance given previous findings.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.