Journal of Taiwan Agricultural Research

Author:San-Tai Wanci, Chi-Hsiung Hsiao, Shing-Jy Tsao and Min-Mao Tseng

Abstract:

Extreme male, vegetative male, female and monoecious plants are four types of flower sex of spinaches. In an open pollinated cultivar, the ratio of male and female plants is in general 1 : 1, with a few monoecious plants. The advantages of a monoecious line include later bolting and higher yield as compared to male plants. Also, single plant selection can be conducted easily and increased femaleness of a good cultivar cna be achieved quickly when crossed with a monoecious line. The experiment was conducted in TARI. After selecting for elite monoecious and female as well as roguing male and early bolting ones for two generations, the average ratios of 8 spinach cultivars Oines) of female, male and monoecious plants changed from 42.5%, 43.5% and 14.0%• respectively, in 1994 to 13.9%• 15.7% and 70.3 %, respectively, in 1996. Average bolting time and coefficient of variation of these cultivars Oines) were 10.6 wks aftw sowing and 6.8%, respectively, in 1994. After 2 generations of selections, the corresponding values changed to 11.8 wks after sowing and 5.5

% in 1996. It means that spinaches bolt later and in a more concentrated periods.

Key words:Spinaches, Bolting, Monoecious plants.

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