译 名：
EFFECT OF PHOTOPERIOD DAy/NIGHT AND ROOT TEMPERATURE COMBINATION ON GROWTH AND DEVELOPMENT OF LOCAL CULTIVARS OF LEAF AMARANTH
作 者：
Ren Haiyun Guan Hanping Lou Chenghou, Plant Physiology Laboratory, Beijing Agricultural University, Beijing
关键词：
Amaranth;;Photoperiod;;Temperature effects
摘 要：
To ascertain optimum light and temperature conditions for rapid, high-yield cultivation of leaf amaranth under controlled environment, six local common cultivars are chosen and subjected to treatments with various photoper- iod, day/night and root/shoot temperature combinations. Plants are raised in solution culture under artificial illumination in programme-controlled growth chambers (Conviron SIOH). Root temperature is seperately controlled in large thermo-bottles. Five of the six cultivars show short day behavior in blooming and gradations in sensitivity, the early green cultivar being the most sensitive; The rest four cultivars, at the age of 15-22 days, respond to eight hour exposu- re for 2-4 days. 30℃ day temperature and 25℃ night temperature are most favourable to vegetative growth. Relatively higher root temperature seems desirable in early vegetative growth.
