Growth and solasodine production by Solanum aviculare and Solanum laciniatum under moisture stress at different temperatures

摘要

Abstract Cloned plants were grown in growth-chambers for 82 days under dayight temperatures of 15° 10°, 20°/10°, 20°/1 So, 2So/1So, and 2So/20°C. Dry matter yields were greatest at 25°C daytime temperatures. Solanum laciniatum also grew well in the coldest conditions, whereas growth of S. aviculare was depressed at the two lowest temperatures. Solasodine concentrations in leaves and particularly in sterns were lower at the warrnest temperatures. Total solasodine yield per plant remained approximately constant because of compensatory vegetative growth, except at the two temperature extremes. Fruiting was greatly enhanced by 20°/10°C treatment of S. laciniatum but S. aviculare did not respond. Severe moisture stress limited growth but increased solasodine concentrations in sterns and leaves; total solasodine production was reduced. A field trial showed that mild moisture stress, from withholding irrigation, lowered dry matter yields but had no effect on solasodine concentration, i.e., solasodine productio...