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dc.contributor.authorGe, Li Li
dc.contributor.authorTian, Hui Qiao
dc.contributor.author田惠桥
dc.contributor.authorRussell, Scott D.(Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma 73019 USA )
dc.date.accessioned2011-08-21T07:18:51Z
dc.date.available2011-08-21T07:18:51Z
dc.date.issued2007
dc.identifier.citationAmerican Journal of Botany. 2007;94:1046-1060zh_CN
dc.identifier.issn0002-9122
dc.identifier.urihttp://dx.doi.org/doi:10.3732/ajb.94.6.1046
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/10508
dc.description.abstractCalcium has an essential signaling, physiological, and regulatory role during sexual reproduction in flowering plants; elevation of calcium amounts is an accurate predictor of plant fertility. Calcium is present in three forms: (1) covalently bound calcium, (2) loosely bound calcium typically associated with fixed and mobile anions (ionic bonding); and (3) cytosolic free calcium-an important secondary messenger in cell signaling. Pollen often requires calcium for germination. Pollen tube elongation typically relies on external calcium stores in the pistil. Calcium establishes polarity of the pollen tube and forms a basis for pulsatory growth. Applying calcium on the tip may alter the axis; thus calcium may have a role in determining the directionality of tube elongation. In the ovary and ovule, an abundance of calcium signals receptivity, provides essential mineral nutrition, and guides the pollen tube in some plants. Calcium patterns in the embryo sac also correspond to synergid receptivity, reflecting programmed cell death in one synergid cell that triggers degeneration and prepares this cell to receive the pollen tube. Male gametes are released in the synergid, and fusion of the gametes requires calcium, according to in vitro fertilization studies. Fusion of plant gametes in vitro triggers calcium oscillations evident in both the zygote and primary endosperm during double fertilization that are similar to those in animals.zh_CN
dc.language.isoenzh_CN
dc.publisherBOTANICAL SOC AMER INCzh_CN
dc.subjectangiosperm sexual reproductionzh_CN
dc.subjectcalciumzh_CN
dc.subjectcell signalingzh_CN
dc.subjectdouble fertilizationzh_CN
dc.subjectgamete interactionszh_CN
dc.subjectprogrammed cell deathzh_CN
dc.titleCalcium function and distribution during fertilization in angiospermszh_CN
dc.typeArticlezh_CN


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