Ammopiptanthus nanus

???? ????? ???? ?? ?? ?? Ammopiptanthus nanus megasporogenesis female gametophyte fecundation embryo endosperm ??????;???;??? ??????? ??? ?????????1??????????????????????????????????????????????????????????????????????????????????????4???????????????????????????????????????????????????????????????????????????????? Simple ovary, the placentation is brink. The ovules are campylotropous. The ovule is bitegmic and crassinucellate. The megaspore archesporium is initiated from sub-epidermis of nucellus. The megaspore mother cell divides into linear tetrad after meiosis. The chalazal end megaspore is functional one. The embryo sac is the Polygonum type when the embryo sac is mature. More

anagyridis on Ammopiptanthus nanus and Uromyces vignae on Vigna sesquipedalis are new to Xinjiang. Halostachys caspica and Nanophyton erinaceum are new hosts of Uromyces chenopodii. All the specimens are deposited in the Mycological Herbarium of Xinjiang Agriculture University (MHAAC). ? ?,???,???.??????????.?????????????.????,2008,27(6):825~831 ???? ??/???? ??PDF??? ?????????????1??3? ???????????B401 ???100101 ??(?)??????????? ???010-64807521 ???010-64807327 ????: jwxt@im.ac. More

Ammopiptanthus nanus is an endangered evergreen shrub endemic to the deserts of central Asia and plays an important role in delaying further desertification. We examined allozyme variation and AFLP diversity in A. nanus populations and investigated the mating system of this species using progeny arrays assayed for polymorphic allozyme loci. Mating system analysis in the Keyi'eryongke'er population showed low levels of out-crossing, and strong inbreeding depression. Low levels of genetic variation were detected at both population (allozyme, Pp= 14. More