植物与斐波那契数

研究发现植物中的花瓣、叶片、果籽数大多与斐波那契数列相吻合，而斐波那契数列又与黄金数有关，植物叶序的排列使其在生长过程中一直都能最佳地利用空间，种子排列的“优化方式”，使其具有差不多的大小却又疏密得当，这些都是按照自然规律进化而来的。     

番木瓜环斑病毒株系的分子生物学方法鉴定

以PRSV株系牧民性引物对PRSV的PRSV126（PRSV日本分离物）、Ys、Vb和Sm等株系进行RT－PCR方法鉴定，引物PR21／PR22能把Ys从Vb和Sm中鉴定出来，PR300／PR301则能把Vb从Ys、Sm和PRSV126中鉴定出来；用限制性内切酶Hae Ⅱ、Sau3A I和Hinf I对PRSV的PRSV126、Ys、Vb和Sm等株系进行单酶切RT－PCR－RFLP分析，Hinf I能把PRSV126与Ys、Vb和Sm鉴别开来，Sau3A I能把Ys与Vb和Sm鉴别开来，Hae Ⅱ则能把Ys与PRSV126、Vb和Sm鉴别开来；以P1／P2为引物，对Vb、Ys和Sm株系进行RT－PCR－RFLP－SSCP分析，结果能一次把三者较好地区别开来。     

植物颗粒剂对蜗牛和蛞蝓诱杀作用初报

利用药用植物的粉碎物配合对蜗牛和蛞蝓有引诱作用的食物引诱素及成型剂等原料制成的植物颗粒剂在室内和菜地进行诱杀实验，结果表明：植物颗粒剂对蜗牛和蛞蝓都有较强的诱杀效果，防效分别达到83．4％和67．8％，显示了一定的实用性。植物颗粒杀虫剂对环境无污染，对人畜及害虫天敌无毒害，是一种新型的低毒植物源农药。     

Reproductive Biology and Prospects for Conservation of Caldesia parnassifolia (Alismataceae)——A Threatened Monocot in China

Caldesia parnassifolia (Bassi ex Linn.) Parl. in China has declined in number in recent years and is increasingly faced with the risk of extirpation arising from anthropogenic changes associated with rapid urbanization and expansion of both agriculture and infrastructure. To aid in provision of the data needed for effective conservation of the species, studies on the habitat, pollination ecology, and breeding system of C.parnassifolia were carried out on natural populations occurring in Southeastern China. Flowering in the study populations extended for more than eighty days beginning in early summer. Floral anthesis occurred in the morning hours and proceeded rapidly, lasting about 45 min. Flowers lasted ca.8h. Caldesia parnassifolia is self-compatible; however autogamy resulted in lower seed set than geitonogamy and xenogamy as well as free pollination. The data on pollen/ovule (P:O) ratio is consistent with a partially selfing and outcrossing mating system. Interpopulational crosses yielded similar seed set to within-population crosses. Agamospermy did not occur in the study populations. Propagation is achieved through seeds as well as through turions which commonly occur in the inflorescences. Flies (Insecta; Diptera) were the most frequent visitors to the flowers of C.parnassifolia; however bees (Insecta;Hymenoptera )composed a larger proportion of effective pollinators. The Syrphidae species Sphaerophoria indiana (Bigot) presents evidence of oligolectic foraging behavior. Recommendations are made on the immediate steps necessary for conservation of Caldesia species in China.     

攀枝花市苏铁植物保护与利用初探

攀枝花市有亚洲最大，株数最多，分布最集中的苏铁原生林，被列为国家级自然保护区，城区建有苏铁植物因。本文在总结攀枝花市二十多年来对苏铁保护工作的基础上，对苏铁植物就地、迁地保护与开发利用提出了研究对策及意见。