Cucumber carbohydrate metabolism and translocation under chilling night temperature

Journal of Plant Physiology
Minmin MiaoBeisheng Cao

Abstract

A cold-tolerant line (NY-1) and a cold-sensitive cultivar (Jinyan 4) of cucumber (Cucumis sativus) were treated with temperatures of 28 degrees C/22 degrees C or 28 degrees C/12 degrees C (day/night) in a 10-h photoperiod. Carbohydrates and related enzymes were assayed from 0 to 4 h after the start of the dark period. Compared to the normal night temperature (22 degrees C, control), sucrose, stachyose and galactinol increased in mature leaves under cold-night treatment (12 degrees C) while sucrose, glucose and fructose in fruits remained unchanged. In peduncles, where stachyose is catabolized to sucrose after long-distance transport, cold nights simultaneously induced a significant increase of stachyose (substrate) and a decrease of sucrose (product), indicating that the metabolic step from stachyose to sucrose in peduncles is crucial to translocation inhibition in cold nights. This decrease was more pronounced in the cold-sensitive cultivar. Similar growth rates of fruits on one-fruit and two-fruit plants under cold-night treatment further confirmed that it is sink activity rather than source supply that is limiting the source-sink translocation. No significant genotypic differences in enzyme activities involved in the stachyo...Continue Reading

Citations

Oct 13, 2010·Journal of Experimental Botany·Minmin MiaoKuishan Wang
Nov 6, 2013·Journal of Plant Research·Jie ZhouQiang Zhuge
Apr 1, 2021·Scientific Reports·Matej VosnjakValentina Usenik
Jun 3, 2021·International Journal of Molecular Sciences·Xiao LiuChun-Lei Wang

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