Germination of Stigmaphyllon blanchetii Seeds in Different Temperatures and Luminosity

ABSTRACT: The objective of the present work was to study the influence of temperature and light on germination of seeds of Stigmaphyllon blanchetii, popularly known as rat tail. The first stage of the research evaluated the effect of three constant temperatures (20 oC, 25 oC and 30 oC) and an alternating temperature (20-30 oC). In the second stage, for simulation of different types of light, four conditions of luminosity (white, red, far red and absence of light) were used. The temperatures that provided the best germination and development for S. blanchetii are the constant (30 oC) and the alternating (20-30 oC) ones. The seeds germinated both in the presence and absence of light, but there was greater germination and seedling development in the absence of light; thus they were classified as preferential negative photoblastic seeds.

摘要：本研究旨在探究温度与光照对布兰奇柱藤（Stigmaphyllon blanchetii，俗称"鼠尾"）种子萌发的影响。研究第一阶段评估了三种恒温（20℃、25℃与30℃）及一种变温（20-30℃）对种子萌发的影响。第二阶段为模拟不同光照类型，设置了四种光照条件：白光、红光、远红光及全黑暗环境。适宜布兰奇柱藤种子萌发与幼苗生长的最优温度为恒温30℃与变温20-30℃。该种子在有光与无光条件下均可萌发，但黑暗环境下的萌发率与幼苗生长表现更佳，因此被归类为偏负光性种子。