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Volume 4, Issue 3 (Suppl) Adv Crop Sci Tech
ISSN: 2329-8863 ACST, an open access journal
Page 72
Notes:
Plant Genomics 2016
July 14-15, 2016
conferenceseries.com
July 14-15, 2016 Brisbane, Australia
4th International Conference on Plant Genomics
Maize responses to photoperiod changes under controlled conditions
You-Zhi Li
Guangxi University, China
Response of maize to photoperiods affects adaption of this crop to environments. Sensitivity towards photoperiod changes has
limited integration of tropical and temperate maize germplasm into existing breeding programs. We characterize the phenotypes
of four temperate-adapted maize foundation parents, Huangzao 4, Chang 7-2, Ye 478 and Zheng 58 and two tropically adapted maize
foundation parents, M9 and Shuang M9 throughout the growth stage under three constant photoperiod regimes in a daily cycle of
24 h at 28 ºC and analyzed expression of 48 photoperiod response associated genes. Consequently, long photoperiod (LP) repressed
development of the tassels of photoperiod sensitive maize lines at V9 stage and caused subsequent failure in flowering; failure of
photoperiod sensitive maize lines in flowering under LP was associated with lower expression of flowering related genes; photoperiod
changes could make a marked impact on spatial layout of maize inflorescence. The larger oscillation amplitude of expression of
photoperiod responsive genes occurred in LP sensitive maize lines. In conclusion, failure in development of tassels at V9 stage under
LP is an early indicator for judging photoperiod sensitivity. The adaptation of temperate adapted maize lines to LP is due to the better
coordination of expression among photoperiod sensing genes instead of the loss of the genes. High photoperiod sensitivity of maize
is due to high expression of circadian rhythm responding genes improperly early in the light.
Biography
You-Zhi Li is a Professor at the College of Life Science and Technology, Guangxi University, China. He has obtained his PhD degree in Microbiology from the
Huazhong Agriculture University and Master degree in Plant Pathology from the North West Agriculture and Forestry University (formerly named Northwestern
Agricultural University). His research interests are very broad but the focus is on maize environmental adaptability. He is presently serving as the Associate Dean
of the College of Life Science and Technology as well as a Principle Investigator of the State Key Laboratory for Conservation and Utilization of Subtropical Agro-
bioresources, Guangxi University, China.
You-Zhi Li, Adv Crop Sci Tech 2016, 4:3 (Suppl)