Straightening out the Palmaceae
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Straightening out the Palmaceae

Straightening out the Palmaceae
Straightening out the Palmaceae

As one of the most obvious indications of growth, you might have thought that there was little new to discover about increase in length of plant stems. Wrong! Studying growth in Iriartea deltoidea (Arecaceae), Heidi Rinninger and Nathan Phillips have uncovered an ‘efficient and novel method for height growth’. Typically, one is taught that increase in height of trees – primary growth – is the result of apical meristem activity (formation of new cells near the end of the stem that increase in length as they develop and differentiate comparatively close to the meristem). But in this palm the duo found that stems were lengthening after their tissues were differentiated and far below the apical meristem. Although such a phenomenon might be presumed to damage the non-extensible, mature conducting cells of the vascular tissues, the vascular bundles are laid down in a spiral which apparently ‘unwinds’, resulting in the observed length increase. The pair consider this so-called ‘secondary lengthening’ not only to be the most efficient method for height growth in terms of carbon investment, but also a mechanism that permits plasticity in height growth rates for more rapid growth when short-lived canopy gaps are present than they would have with apical growth alone. As they tantalisingly conclude, ‘This finding also highlights the fact that in addition to biodiversity, tropical rainforests also contain a high degree of “physiological” diversity, the depth of which is just beginning to be discovered’. Slinky!

Nigel Chaffey

I am a Botanist and former Senior Lecturer in Botany at Bath Spa University (Bath, near Bristol, UK). As News Editor for the Annals of Botany I contributed the monthly Plant Cuttings column to that international plant science journal for almost 10 years. As a freelance plant science communicator I continue to share my Cuttingsesque items - and appraisals of books with a plant focus - with a plant-curious audience at Plant Cuttings [] (and formerly at Botany One []). In that guise my main goal is to inform (hopefully, in an educational, and entertaining way) others about plants and plant-people interactions, and thereby improve humankind's botanical literacy. I'm happy to be contacted to discuss potential writing - or talking - projects and opportunities.
[ORCID: 0000-0002-4231-9082]

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