关键词: 银杏, 超微结构

Abstract: Ginkgo pollen iS scanned and transmitted under electronics microscope an d something iS foun d：
(1)The ginkgo pollen grain form，for the boat shape under the dry condition，it is back for the oval to inhale water，
and it is compose of two parts，the sprouting thin-wall construction (occupying about 40％ of total area)and
the ectotheca with overburden(occupying about 60％ of total area)， and both border land have clear warty evection．
The form is NoP1C1 type in NPC system on the classification． (2)The warty ornamentation polen has the
three kinds，Smooth type，rough type and I-type． (3)The uhrastmcture of polen under the electronics microscope
shows：The ectotheca ofginkgo polen is composed oftwo part，the sprouting thin-wall construction(0．23—
0．28／an in thickness)and overburden(0．75—0．82 pan in thickness)．The overburden in border land of them iseleadv
．
thicken to warty eveetion． The lacuna among the baculums is linked together with milipore． Th e sclerench~
．
ana of overburden， spreads when inhaling water and uncovers sprouting part， an d systoles when losing water
and covers sprouting part partly，which preserves the sprouting part． (4)Th e only reproduction cell， famess，
l0．32一l1．28 lan in length，is 2-cellular type． It is nearby situated the equatorial axis， an d parallel th it in
align． (5)Th ere are polycyclic pores on the pollen，which is sprouting organ inside the polen．Th en sprouting
orgall with overburden is folded．

Key words: Ginkgo, Ultrastructure