ZmCCA1a on Chromosome 10 of Maize Delays Flowering of Arabidopsis thaliana

Frontiers in Plant Science
Yong ShiYanhui Chen

Abstract

Maize (Zea mays) is a major cereal crop that originated at low latitudes, and thus photoperiod sensitivity is an important barrier to the use of tropical/subtropical germplasm in temperate regions. However, studies of the mechanisms underlying circadian regulation in maize are at an early stage. In this study we cloned ZmCCA1a on chromosome 10 of maize by map-based cloning. The gene is homologous to the Myb transcription factor genes AtCCA1/AtLHY in Arabidopsis thaliana; the deduced Myb domain of ZmCCA1a showed high similarity with that of AtCCA1/AtLHY and ZmCCA1b. Transiently or constitutively expressed ZmCCA1a-YFPs were localized to nuclei of Arabidopsis mesophyll protoplasts, agroinfiltrated tobacco leaves, and leaf and root cells of transgenic seedlings of Arabidopsis thaliana. Unlike AtCCA1/AtLHY, ZmCCA1a did not form homodimers nor interact with ZmCCA1b. Transcripts of ZmCCA1a showed circadian rhythm with peak expression around sunrise in maize inbred lines CML288 (photoperiod sensitive) and Huangzao 4 (HZ4; photoperiod insensitive). Under short days, transcription of ZmCCA1a in CML288 and HZ4 was repressed compared with that under long days, whereas the effect of photoperiod on ZmCCA1a expression was moderate in HZ4. In ...Continue Reading

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Citations

Jun 24, 2020·Biochemical Society Transactions·Francesca CaselliVeronica Gregis

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Datasets Mentioned

BETA
AC215881
EU954568.1
EU955544.1

Methods Mentioned

BETA
immunoprecipitation
PCR
confocal microscopy
transgenic
two-hybrid
Y2H

Software Mentioned

Primer Premier
ClustalW
Matchmaker
MEGA X

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