滇藏常绿杜鹃亚属的修订

常绿杜鹃亚属Subgenus Hymenanthes是由K.Koch（1872）根据Blume（1826）建立的Genus Hymenanthes改级组合而成。但长期以来人们一直沿用了Maximowicz（1870）所建立的、后由Koehne（1893）修订过的Subgenus Eurhododendron这一亚属名称,直到最近D.F.Chamberlain（1978,1979,1982）对该亚属的名称才作了正式订正。     

LU YAN-HAO ,1 91 3- 2 0 0 0 ,IN MEMORIUM

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Possible role of jasmonic acid in the regulation of floral induction, evocation and floral differentiation in Lemna minor L.

Jasmonic acid (JA) is implicated in a wide variety of developmental and physiological processes in plants. Here, we studied the effects of JA and the combination of JA and ethylenediamine-dio-hydroxyphenyl-acetic acid (EDDHA) on flowering in Lemna minor in axenical cultures. JA (0.475-47.5 nmol l(-1)) enhanced floral induction in L. minor under long-day (LD) conditions. Under the same conditions, at a concentration of 237.5 nmol l(-1), JA inhibited floral induction, and at a concentration of 475 nmol l(-1) it prevented floral induction. Under LD conditions with LD preculture, a combination of EDDHA (20,500 nmol l(-1)) and JA (47.5 nmol l(-1)) had a synergistic effect on the promotion of floral induction. Floral induction was enhanced to the greatest extent in experiments with LD precultures. Microscopic examination of microphotographs of histological sections showed that JA and, to an even greater extent, JA+EDDHA at optimal concentrations promote apical floral induction (evocation). Furthermore, JA, and to an even greater extent JA in combination with EDDHA in an optimal concentration, also promote flower differentiation, especially the development of stamens, as is evident from the microphotographs. The experimental results show that JA promotes floral induction in other species of Lemnaceae from various groups according to their photoperiodic response. The results support our hypothesis that, in addition to previously ascribed functions, JA may regulate floral induction, evocation and floral differentiation. Our hypothesis is supported also by the results obtained by quantitative determination of endogenous JA levels in L. minor at three growth stages. The levels of endogenous JA decreased from 389 ng JA g(-1) (fresh weight) of L. minor during the vegetative stage to 217 ng JA g(-1) during the evocation stage, and to 37.5 ng JA g(-1) during the flowering stage, which proves that JA is used for flowering.     

A MENI0RIAL T0 THE FAM0US CHINESE GE0B0TANIST PROF. ZHU YAN-CHEN

The Yunnan University, Kunming Institute of Botany, Academia Sinica, on December 5, 1980, 1ost its staff member through 30 years and more,the Senior Professor of Plant Ecology and Geo- botany,Head of Geobotanical Laboratory, (Yun- nan University),President the Yunnan Botanical Society, Editor of Acta Botanica Yunnanica, etc     

Spacing behaviour of juvenile corn mice, Calomys musculinus, at the beginning of the breeding period, in absence of adult males

This research was carried out to examine the hypothesis that the absence of fathers promotes a different spacing behaviour in juveniles Calomys musculinus at the beginning of the breeding period. The study was carried out in four 0.25-ha enclosures (two control and two experimental), in a natural pasture, between November 2003 and February 2004. In this study the fathers were removed from the experimental enclosures after juveniles were born. Home-range size depended on sex of juveniles and treatment (father removal). In control and experimental enclosures, female home-range sizes were always smaller than male home-ranges. Male home-ranges were always larger in experimental enclosures than in control enclosures. Treatment and overlap type (intra- and inter-sexual) were not independent. The overlap proportions of male home-ranges were greatest in experimental enclosures than in control enclosures, in both the overlap types (male/male, males/females). The intra- (females/females) and inter-sexual (females/males) overlap proportions of female home-ranges were independent of treatment. In C. musculinus, at the beginning of the breeding period and in absence of adult males, juvenile males increase their home-range size and therefore the degree of inter- and intra-sexual home-range overlap as a mechanism for enlarging the number of receptive females that they encounter.