Delayed development of basal spikelets in wheat explains their increased floret abortion and rudimentary nature.

Autor:	Backhaus AE; John Innes Centre, Norwich Research Park, Norwich, Norfolk NR4 7UH, UK., Griffiths C; Plant Science, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK., Vergara-Cruces A; John Innes Centre, Norwich Research Park, Norwich, Norfolk NR4 7UH, UK., Simmonds J; John Innes Centre, Norwich Research Park, Norwich, Norfolk NR4 7UH, UK., Lee R; John Innes Centre, Norwich Research Park, Norwich, Norfolk NR4 7UH, UK., Morris RJ; John Innes Centre, Norwich Research Park, Norwich, Norfolk NR4 7UH, UK., Uauy C; John Innes Centre, Norwich Research Park, Norwich, Norfolk NR4 7UH, UK.
Jazyk:	angličtina
Zdroj:	Journal of experimental botany [J Exp Bot] 2023 Sep 13; Vol. 74 (17), pp. 5088-5103.
DOI:	10.1093/jxb/erad233
Abstrakt:	Large differences exist in the number of grains per spikelet across an individual wheat (Triticum aestivum L.) spike. The central spikelets produce the highest number of grains, while apical and basal spikelets are less productive, and the most basal spikelets are commonly only developed in rudimentary form. Basal spikelets are delayed in initiation, yet they continue to develop and produce florets. The precise timing or the cause of their abortion remains largely unknown. Here, we investigated the underlying causes of basal spikelet abortion using shading applications in the field. We found that basal spikelet abortion is likely to be the consequence of complete floret abortion, as both occur concurrently and have the same response to shading treatments. We detected no differences in assimilate availability across the spike. Instead, we show that the reduced developmental age of basal florets pre-anthesis is strongly associated with their increased abortion. Using the developmental age pre-abortion, we were able to predict final grain set per spikelet across the spike, alongside the characteristic gradient in the number of grains from basal to central spikelets. Future efforts to improve spikelet homogeneity across the spike could thus focus on improving basal spikelet establishment and increasing floret development rates pre-abortion. (© The Author(s) 2023. Published by Oxford University Press on behalf of the Society for Experimental Biology.)
Databáze:	MEDLINE
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