TY  - JOUR
AU  - Javkar, Ruchira
AU  - Avhad, Anil
T1  - Effect of drought and salinity stress on Calcium oxalate crystals of Portulacaria afra. (L.) Jacq.
JO  - Journal of Stress Physiology & Biochemistry
Y1  - 2023/february
VL  - 19
IS  - 1
SP  - 127
EP  - 140
UR  - http://www.jspb.ru/issues/2023/N1/JSPB_2023_1_127-140.pdf
KW  - Alarm photosynthesis
KW  - Calcium oxalate crystals
KW  - Energy dispersive X-ray Spectroscopy (EDS)
KW  - Environmental Scanning Electron Microscopy (ESEM)
KW  - Portulacaria afra. (L.) Jacq
U1  - 1997-0838
N2  - Oxalic acid (C2H2O4) and Calcium (Ca2+) react to form the salt Calcium oxalate (CaOx), which crystallises into a variety of topologically diverse crystals. CaOx crystals have been found in at least 215 plant groups, which corresponds to numerous species. Crystals can be found in vascular, epidermal, ground, and other tissues in addition to roots, stems, leaves, flowers, fruits, and seeds. They develop in crystal idioblasts, specialised cells, in their vacuoles. According to recent studies, CaOx crystals are in fact useful tools that are crucial, especially in stressful conditions. As plants lack an excretory system, the Ca component regulates the cytosolic concentration levels and immobilises excess amounts of this element. Oxalates operate as a dynamic carbon store and set off an alert during photosynthesis, which results in the production of CO2. The article aims to provide readers with a greater understanding of Portulacaria afra's CaOx crystals and the projected crystal disintegration that would liberate carbon and supply the photosynthetic cycles with it as defence against salinity and drought stress.
ER  -