Effects of Temperature and Gibberelin on the Growth and Bolting of Green Onion (Allium Fistulosum L.)

Abstract

The relationships between teperature and gibberellin to the growth and bolting of green onion were studied. The bolting percentage was increased when green onion (Allium Fistulosum L. cv. Ilan 2) were grown in day 20C and night 10C temperature with a 10 h photoperiod for a duration, then transplanted to the field. The time required for bolting shortened, the uniformity of bolting and the number of flower stalk per tillering increased with longer low temperature treatment. Plants treated with low temperature longer than 6 weeks reduced the plant growth, and decreased number of tillering per plant which caused less flower stalks produced. Green onion cv. Ilan 2, Funon and 4430 were sprayed with 0, 10, 100 or 1000 ppm GA after plants were transplanted the 30th, 60th or 90th day. The bolting percentage, flower stalk and flower stalk per tillering were not influenced by GA concentration or spraying time. Spraying greem onion with with 10-100 ppm GA increased the number of leaves, plant height and tillering per plant.