Journal of Taiwan Agricultural Research

Author:Hui-Ling Lo, Chen-Yu Lin, and San-Tai Wang*

Abstract:

    This research is to evaluate heat tolerance in Chinese kale for the purpose of new variety selection. The physiological indices under high temperature conditions, such as soil and plant analyzer development (SPAD), maximal quantum efficiency of PSII (Fv/Fm) and electrical conductivity (EC) value, were investigated for heat tolerance selection in addition to high quality and high yield. In the growth chamber of day/night temperature 35℃/30℃, thirty-two Chinese kale lines were screened. Two lines, numbers 16-1219 and 16-1223, were selected with SPAD value above 30, EC value lower than 50%, and withering index lower than 65%. In field trials, numbers 16-1214 and 16-1221 were screened out from twenty lines with erect plant type, leaf tip leaves, stronger branches and leaves and sparse leaf at the base. They expressed heat tolerant traits and can be used as hybrid parent in future breeding program. The results of three heat-resistance indices, SPAD, Fv/Fm and EC value, were tested for six varieties of Chinese kale in growth chamber. Varieties ‘Fengshan No. 1’, ‘Lan Xing’ and ‘Hei Ma’ were found more superior in heat tolerance performance than other cultivars/lines.

Key words:Chinese kale, Heat tolerant, Selection

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