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《Acta Scicentiarum Naturalum Universitis Pekinesis》 1995-02
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Initiating Effects of Calcium on Pollen Germination and Its Regulative Role in Pollen Tube GroWth

GONG Ming YANG Zhonghan CAO Zongxun(T H Tsao)(Life Science College,Peking University,Beijing 10087)  
The initiating effects of Ca ̄(2+)on pollen germination and its regulative role in pollen tube growth were investigated in Pinus yunnanensis and Nicotiana tabacum. High concentration of Ca ̄(2-)(10 ̄(-1)~IO ̄(-2)mol/L)in the medium caused severe inhibition of pollen germination and tube growth,but lower concentration of Ca ̄(2+)or Ca ̄(2+)-deficiency(10 ̄(-3~0mol/L)had little effect on pollen ger-mination and tube growth. Measurement of Ca content in germinating pollen showed that there was a significant Ca ̄(+2) release from pollen during the hydration and early germination phase. How-ever,Ca ̄(2+)specific chelating agent EGTA led to the inhibition of pollen germination,and this inhibi-tion could be eliminated by re-adding excess Ca ̄(2+)to the medium containing EGTA. Ca ̄(2+)channel blockers verapamil and Co ̄(2+)also caused the inhibition or failure of pollen germination, In addition,Ca ̄(2+)ionophore A23187 impeded pollen germination and tube growth. Unlike veraparmil and Co ̄(2+)treatments,pollen tube growth was more sensitive to A23187 than pollen germination. These results suggested that Ca ̄(2+)is indispensible for pollen germination and tube growth although exogenous addition of Ca ̄(2+)to the medium is not necessary. The uptake of Ca ̄(2+)occurred mainly in early germi-nation phase, and Ca ̄(2+)could act as an initiator of pollen germination and also as a regulator of pollen tube growth.
【CateGory Index】: Q945
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