Abstract:The process of fertilization and embryogenesis of Chimonathus praecox Link. was observed. The results showed that the pollen started to germinate one day after the pollination. The pollen tube penetrated through the style canal and reached chalaza in about 6 days. The tube extended slowly along the ovule towards the micropyle and entered the embryo sac in another 2 days. Afterwards, two sperms were discharged. One fused with the egg cell and the other with the central cell. Observations on the material of 14 days after the pollination showed that the double fertilization had finished. After a short phase of dormancy, the primary endosperm nucleus underwent free nuclear division. The free nuclei of the antipodal part became cellular at first. About 37 days later, the embryo sac was filled with cellular endosperm. So it belongs to the nuclear type. Before the development of the embryo, the zygote went through a dormant period lasting about two weeks. With the embryo development, most of the endosperm degenerated, and the cells near chalaza entered the chalaza, digested it and further nourished the embryo. At maturity of the seed, the endosperm remained in a rodlike structure around the embryo. The embryogenesis belongs to Oragrad type.
全 文 :uuadmpu3 01Gqq 6uo!~~~vaj alqnq mm~d SR~ZUVUUUI?~~ sp.10~ A- pm.%q 01 &opq s!saua%o1Ggrua au -01Ggrua ay prmare aq3nqs aw B T pauv -a uadmpua ay paas ayl JO hqmu IY .o1Ggrua ay paqspnou law pm I! psa%!p wz1qq3 aq pa~ua wz1qq3 mu sna3 ay pm pa1mauafaap uadsopua aq jo I~~UI ~uaurdo~anap o1Ggrua ayl q!~ .syaafi mq Incup 91I!pq pouad IUBUUO~ B @naq Iuam aldh ay 01Gpa aq p ~uau~dolan -ap aq aro~aa .* mpnu ay 01 &opq I! CIS .~~~admpua qnp qp pang mfi ms 01Ggura ay .~aq sX~p LC Inq -~snj IB nr[nvao aumaq pd ppodym aq p !apnu aarj ayL .uo!s!nq~ ma13 -nu aag Iuamapun snapnu dsopua Lnmpd aq dx~~~~op jo amqd voqs B law .paqs!ug pq uo!Iwzg!vaj alqnop ayl ~mp a~oqs UO!IBU!J@ aq ~ayr, sX~p l jo pualmu ayl uo SUO~BAI~~~O ao pua3 aq ylp aaqo ayl pm nao ISaa ayl yly pasy aug .pa%tqsq axafi wads aml spmma~~~ d~p laylow u! ms o1Gqma ayl pajua prne alAda13p ayl 6pz~fi01 apo ayl %op ~IMOIS papual -xa aqnl au sd~p 9 In- y mpq3 paq- prne puu3 a~hs ayl @naq pa~wauad aqnl uand q, .UO!IEU!~~ aq aye Lp auo apuua% 01 pams uapd ayl ~q pfiOq6 t7qnsa.1 q puss -go SEA xmmd snyyauoiqy3 jo s!sauaSokqwa prne uo!Iqyaj jo ssxmd au pupqv
%%B%, 1990. &ae%%fSb, 18(3) :327 - 332 B@6, #%*, 1%. &a%t%rC@f% ,l2(2) :lo1 - 104 LEI!#. #a*, 1%. ++&&kt% HSt ,w(2 ) : 204-206 @a$:, 1987. #$13%t%rC83i#f .its : &+&%%&if Johri B M , 1984. Embayology of ~nej&. Berlin : Spring-Vedq Nicely K A, 1965. Castmua, 30: 38 - 89