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At 10 DAP, DNA endoreduplication was already occurring in the control endosperm; 15% of the nuclei had an endoreduplicating DNA content (12 C or higher).
To elucidate when DNA endoreduplication is most vulnerable to high temperature, both the 4- and 6-d HTTs were imposed at the time of high mitotic activity (4 to 10 DAP) and when DNA endoreduplication had been initiated (10 DAP).
The results from the 4-d HTT applied when DNA endoreduplication was in progress were considerably different from the results obtained when these HTTs were applied during the mitotic phase of endosperm development.
The objective of our study was to determine when during early maize kernel development DNA endoreduplication in the endosperm was most sensitive to high temperature.
In contrast, the HTTs given during the endoreduplication phase of the endosperm cell cycle (10 to 16 DAP) resulted in a FW reduction that was less severe.
The magnitude of DNA endoreduplication is significantly affected when 4-d HTTs are imposed during the mitotic phase of kernel development; this may further contribute to the decrease in sink potential.
From this study, it was clear that HTTs did not have a direct effect on DNA endoreduplication, since the 4-d HTT starting at 8, 10, or 12 DAP did not affect the magnitude of DNA endoreduplication and resulted in an average DNA content at 18 DAP that was similar to that of the control (Fig.
The present findings are in concert with the water deficit studies on maize endosperm DNA endoreduplication by Artlip et al.
DNA endoreduplication in maize endosperm cells: the effect of exposure to short-term elevated temperature.
Cell cycle regulation of DNA replication: the endoreduplication perspective.
Endoreduplication in maize endosperm: involvement of M phase-promoting factor inhibition and induction of S phase-related kinases.
Maternal effects influencing DNA endoreduplication in developing endosperm of Zea mays.