Plant-Genomics-2016_Scientific-Tracks-Workshop

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Volume 4, Issue 3 (Suppl) Adv Crop Sci Tech
ISSN: 2329-8863 ACST, an open access journal
Page 62
Notes:
Plant Genomics 2016
July 14-15, 2016
conferenceseries.com
July 14-15, 2016 Brisbane, Australia
4th International Conference on Plant Genomics
WSC remobilization to grain under drought in wheat
Jingjuan Zhang1, Yunji Xu2, Wei Chen 3, Bernard Dell1, Rudi Appels1, Wujun Ma 1, Rudy Vergauwen4, Ben Biddulph5, Nusrat Khan 1, Xinmin Zhang1, Hao Luo 1,
Australian wheat NVT group5 and Wim Van den Ende4
1Murdoch University, Australia
2Yangzhou University, China
3Chinese Academy of Science and Ministry of Water Resources, China
4Katholieke Universiteit Leuven, Belgium
5Department of Agriculture and Food Western Australia, Australia
Stem water soluble carbohydrate (WSC, mainly fructan), as a main storage carbon source before anthesis, can contribute up to 57%
of wheat grain yield under terminal drought stress. However, the remobilization of stem WSC varies depending on the growth
stages, conditions and genotypes. Therefore, it is worthwhile to further investigate the attributes on high remobilization efficiency of
stem WSC. In recent study, two wheat varieties: Westonia, Kauz and their derived 20 double haploid (DH) lines with large genetic
variations were used in field drought experiments. The results clearly showed that the genetic variation is involved in stem WSC
remobilization to grain under drought; a key enzyme (1-FEH w3) degrades 2-1 linkage fructan and contributes the stem WSC
remobilization; a marker generated within auxin response element (AuxRE) in the promoter region of 1- FEH w3 correlates with
high stem fructan remobilization capacity and the 1-FEH w3 Westonia allele is associated with high grain weight under drought. In
the stem segment analysis, fructan remobilization occurred earlier in lower parts of the stem and sheath under drought, which was
associated with an earlier increase of grain weight and thousand grain weight in earlier mature lines. Root WSC and fructan were one
third of the levels in stems. The significant correlation between root fructan levels and grain assimilation indicate that under terminal
drought, root WSC represents a redistributed carbon source for grain filling rather than deep rooting. Our results further confirmed
that β-(2-6) linkage predominate in wheat, which leads the future study.
Biography
Jingjuan Zhang has completed her PhD from Murdoch University in 2008 and followed by Postdoctoral studies. She has 25 years of work experience in wheat and
has published 16 papers in reputed journals and the recent seven first authored papers and one co-authored paper are relevant to water soluble carbohydrate
remobilization in wheat.
Jingjuan Zhang et al., Adv Crop Sci Tech 2016, 4:3 (Suppl)