Modulation of chlorophyll biosynthesis by water stress in rice seedlings during chloroplast biogenesis*

Abstract

To understand the impact of water stress on the greening process, water stress was applied to 6-day-old etiolated seedlings of a drought-sensitive cultivar of rice (

Proliferating effect of radiolytically depolymerized carrageenan on physiological attributes, plant water relation parameters, essential oil production and active constituents of Cymbopogon flexuosus Steud. under drought stress

“…Water stress is well known to enhance the activity of chlorophyllase, thereby, promoting degradation of the chlorophyll molecules rather than synthesis [39]. It also decreases the biosynthesis of δ-aminolavulinic acid and protochlorophyllide reductase complex [40], involved in chlorophyll biosynthesis. The cumulative suppressive effect of these two reactions, therefore, resulted in the loss of leaf chlorophyll content.…”

Perturbed porphyrin biosynthesis contributes to differential herbicidal symptoms in photodynamically stressed rice (Oryza sativa) treated with 5-aminolevulinic acid and oxyfluorfen

“…Porphyrin biosynthesis and degradation are carefully adjusted to the cellular requirements, reflecting the different needs under varying stress conditions [20][21][22][23]. Water stress controls metabolites of the porphyrin biosynthetic pathway through their scavenging to cope with excited-state dynamics of porphyrins in the cell, consequently attenuating the photodynamic stress imposed by drought [24].…”

Morpho-Physiological and Genetic Responses of Bali Local Rice Cultivars to Drought Stress at Seedling Stage

“…Chlorophyll content decreased significantly under drought stress induced by PEG. Reduced chlorophyll content in drought stress rice seedling has been reported earlier (Dalal and Tripathy, 2012;Kadhimi et al, 2016). The decrease was caused by lack of chlorophyll biosynthetic intermediates, due to down-regulation of gene expression of enzymes for chlorophyll biosynthesis (Dalal and Tripathy, 2012).…”

“…Reduced chlorophyll content in drought stress rice seedling has been reported earlier (Dalal and Tripathy, 2012;Kadhimi et al, 2016). The decrease was caused by lack of chlorophyll biosynthetic intermediates, due to down-regulation of gene expression of enzymes for chlorophyll biosynthesis (Dalal and Tripathy, 2012). Another explanation for reduced chlorophyll content was chlorophyll degradation which leads to senescence (Chen et al, 2015).…”