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增强光下豌豆叶片叶肉原生质体的暗呼吸作用

Light-enhanced dark respiration in mesophyll protoplasts from leaves of pea.

机构信息

School of Life Sciences, University of Hyderabad, Hyderabad 500 134, India.

出版信息

Plant Physiol. 1991 Aug;96(4):1368-71. doi: 10.1104/pp.96.4.1368.

Abstract

The respiratory oxygen uptake by mesophyll protoplasts of pea (Pisum sativum cv Arkel) was stimulated up to threefold after 15 minutes of illumination at an intensity of 1250 microeinsteins per square meter per second in the presence of 5 millimolar bicarbonate at 30 degrees C. The extent of light-enhanced dark respiration (LEDR) increased progressively with duration of preillumination. The LEDR exhibited two phases. The initial high rate of respiration decreased in about 10 minutes to a lower steady value similar to that before illumination. The promotion of LEDR by the presence of bicarbonate and inhibition by glyceraldehyde or 3-(3,4-dichlorophenyl)-1,1-dimethylurea suggested that LEDR was dependent on products of photosynthetic carbon assimilation/electron transport. Thus, the photosynthetic products exert a markedly quick influence on dark respiration in mesophyll protoplasts.

摘要

在 30°C 条件下,当碳酸氢盐浓度为 5 毫摩尔/升,光强为 1250 微爱因斯坦/平方米/秒时,豌豆(Pisum sativum cv Arkel)叶肉原生质体的呼吸氧气摄取量在光照 15 分钟后增加了两倍。在预照光持续时间内,光照增强的暗呼吸(LEDR)的程度逐渐增加。LEDR 表现出两个阶段。最初的高呼吸速率在大约 10 分钟内降低到一个较低的稳定值,类似于照光前的值。碳酸氢盐的存在促进了 LEDR,甘油醛或 3-(3,4-二氯苯基)-1,1-二甲基脲的存在抑制了 LEDR,表明 LEDR 依赖于光合作用碳同化/电子传递的产物。因此,光合产物对叶肉原生质体的暗呼吸有明显的快速影响。

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