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E u r o S c i C o n J o i n t E v e n t s o n
Plant Science, Tissue Engineering
and Parasitology
December 03-04 , 2018
Amsterdam, Nether l ands
International Journal of Applied Science - Research and Review
ISSN: 2394-9988 Plant Science | Tissue Engineering | Parasitology 2018
Biography
XiaoTing Liu is a PhD scholar in The Key Laboratory of Plant-
Soil Interactions, MOE; Department of Plant Nutrition, China
Agricultural University, Beijing, China. During her Masters’
degree, she used the promoters specifically expressed in the
root surface to overexpress the mutant proteins that are free
of phosphorylation to observe whether the nitrogen efficiency
of transgenic rice can be improved. Her primary research
work during PhD is the spatiotemporal distribution of nitrogen,
hormone accumulation, and expression patterns of related
genes in the maize (Zea mays L.) ear under low nitrogen.
Nitrogen (N) is a crucial factor limiting the yield of maize, particularly by
affecting the kernel number during the silking stage. Insufficient supply
of nitrogen can lead to poor ear development and a decrease in the number of
grains per ear. Phytohormones, as information transmission substances, play
an essential regulatory role in the process of crop growth and development,
especially during grain filling (i.e. the development and enrichment of
endosperm). Therefore, studying the control mechanisms of maize cob and
kernel development under nitrogen stress has important practical significance
for improving maize yield. Field experiments were conducted using maize
inbred line B73 to study the nitrogen and hormone accumulation and related
gene expression characteristic to the maize cob development under low
nitrogen condition. We found that low nitrogen significantly inhibited the
growth of maize ears and led to baldness consistent with previous reports.
At silking stage, the dry weight and nitrogen concentration of different parts
of the maize ear followed the order as lower part> middle part> upper part,
whereby reducing N concentration significantly inmiddle part. Furthermore, low
nitrogen significantly reduced the accumulation of dry matter in the lower part
of the corn cob; decreased auxin and abscisic acid concentrations in all parts
of the corn ear without affecting cytokinins and gibberellin concentrations.
Importantly, the expression patterns of hormone synthesis/signal transduction
genes in the upper, middle and lower parts of the maize ear showed complex
variations in rapidly developing maize ear under low nitrogen stress.
Investigation of spatiotemporal distribution of
nitrogen, hormone accumulation, and expression
patterns of related genes in the maize (Zea mays L.)
ear under low nitrogen
Xiaoting Liu, Yaoru Xie and Xuexian Li
MOE Key Laboratory of Plant-Soil Interactions-China Agricultural University, China
Xiaoting Liu et al., Int J Appl Sci Res Rev 2018, Volume: 5
DOI: 10.21767/2394-9988-C2-006