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

ＩｔｉｓｗｉｔｈｄｅｅｐｒｅｇｒｅｔｔｈａｔｗｅｒｅｐｏｒｔｔｈｅｄｅａｔｈｏｆＰｒｏｆｅｓｓｏｒＬｕＹａｎｈａｏ ,ＦｅｌｌｏｗｏｆｔｈｅＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ,ｏｎＦｅｂｒｕａｒｙ 2 0 ,2 0 0 0ａｔｈｉｓａｇｅｏｆ88.Ｈｅｗａｓａｐａｌａｅｏｎｔｏｌｏｇｉｓｔａｎｄｓｔｒａｉｇｒａｐｈｅｒｏｆｈｉｇｈｅｓｔｎａｔｉｏｎａｌａｎｄｉｎｔｅｒｎａｔｉｏｎａｌｒｅｐ ｕｔａｔｉｏｎ .ＢｏｒｎａｔＹｏｎｇｄｉｎｇ ,Ｆｕｊｉａｎ ,ＬｕＹａｎｈａｏｇｒａｄｕａｔｅｄｉｎ 1937ｗｉｔｈ…     

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.     

Habitat use and growth of age-0 whitefish,Coregonus lavaretus,and cisco,C. albula

Synopsis Local American eel stocks were studied by mark-recapture methods along 600m of tidal creeks in Great Sippewisset Marsh, Falmouth, Massachusetts, during summer 1979. The estimated stock density was 350 eels, equivalent to 875 fish ha^-1, and movement of individual American eels over the five week study was usually less than 100 m. Large American eels were found to predominate in the wide marsh creeks whereas smaller American eels predominated in narrower creeks at the landward side of the marsh. Territoriality is suggested as a mechanism for maintaining differences in distribution of size classes and a limited home range.Senior author