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Overexpression of a NAC transcription factor delays leaf senescence and increases grain nitrogen concentration in wheat (English)

In: Plant biology   ;  17 ,  4  ;  2015
  • ISSN:
    1435-8603
  • Article (Journal)  /  Print

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Increasing the duration of leaf photosynthesis during grain filling using slow‐senescing functional stay‐green phenotypes is a possible route for increasing grain yields in wheat ( Triticum aestivum L.). However, delayed senescence may negatively affect nutrient remobilisation and hence reduce grain protein concentrations and grain quality. A novel NAC 1‐type transcription factor (hereafter Ta NAC ‐S) was identified in wheat, with gene expression located primarily in leaf/sheath tissues, which decreased during post‐anthesis leaf senescence. Expression of Ta NAC ‐S in the second leaf correlated with delayed senescence in two doubled‐haploid lines of an Avalon × Cadenza population (lines 112 and 181), which were distinct for leaf senescence. Transgenic wheat plants overexpressing Ta NAC ‐S resulted in delayed leaf senescence (stay‐green phenotype). Grain yield, aboveground biomass, harvest index and total grain N content were unaffected, but NAC over‐expressing lines had higher grain N concentrations at similar grain yields compared to non‐transgenic controls. These results indicate that Ta NAC ‐S is a negative regulator of leaf senescence, and that delayed leaf senescence may lead not only to increased grain yields but also to increased grain protein concentrations.

Table of contents – Volume 17, Issue 4

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The tables of contents are generated automatically and are based on the data records of the individual contributions available in the index of the TIB portal. The display of the Tables of Contents may therefore be incomplete.

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Overexpression of a NAC transcription factor delays leaf senescence and increases grain nitrogen concentration in wheat
Zhao, D. / Derkx, A. P. / Liu, D.‐C. / Buchner, P. / Hawkesford, M. J. et al. | 2015
914
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| 2015

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