摘要

一个最初用于预测番茄茎直径短期和长期变化的综合植物模型在冬季用于同化光照下生长的番茄植株时无法正常工作。在冬季长时间的日照下，出现了一种非典型的昼夜模式，显示在开灯1-2小时后茎直径增加。为了解释这种特定的植物行为，在番茄（Solanum lycopersicum L.）植株上安装了树液流量传感器和线性可变位移传感器。利用自然阳光和HPS灯（169µmol m-2 s-1）的组合，在第1天对植物进行18小时的照明。提出了两个假说来解释这种不典型的植物行为，并随后进行了研究：（i）糖从叶向根的运输降低了韧皮部水势，韧皮部水势从木质部导入水分，导致茎直径增加；以及（ii）光照强度的突然增加导致木质部水势下降，导致空化导致水力传导的变化，进而影响木质部和贮藏之间的水交换，从而影响茎直径的变化。

Revised sap flow driven stem diameter model for tomatoes grown under assimilation lighting

Abstract

A comprehensive plant model that was originally developed to predict short- and long-term variations in tomato stem diameter stopped working properly when used for tomato plants grown under assimilation lighting during winter. Under these prolonged day lengths in winter, an atypical diel pattern emerged showing an increase in stem diameter 1-2 h after the lights were turned on. In order to explain this specific plant behavior, sap flow sensors and linear variable displacement transducers were installed on tomato plants (Solanum lycopersicum L. 'Foundation'). Plants were lighted for 18 h day-1 with a combination of natural sunlight and HPS lamps (169 µmol m-2 s-1). Two hypotheses to explain this atypical plant behavior were formulated, and subsequently examined: (i) transport of sugars from leaves to roots decreases phloem water potential, which imports water from the xylem and causes an increase in stem diameter; and (ii) the sudden increase in light intensity causes a drop in xylem water potential, resulting in changes in hydraulic conductance due to cavitation, which in turn affects the water exchange between xylem and storage and, hence, the variation in stem diameter.

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