Plant & Cell Physiology
2020 vol61 (1)
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During double fertilization in angiosperms, sperm nuclear fusions take place shortly after sperm cells fuse with each of the female gametes (egg and central cell). Maruyama et al. (pp. 29-40) found that depletions of BiP1 and BiP2, two Hsp70 proteins in the endoplasmic reticulum of Arabidopsis thaliana, cause nuclear fusion defects in the egg cell and the central cell. A time-lapse confocal microscopy series revealed that nuclear fusion following chromosomal decondensation of the sperm nucleus plays pivotal roles in endosperm development, which is necessary for subsequent seed formation.
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