TY - EJOU
AU - Sood, Monika
AU - Sharma, Shanti S.
AU - Singh, Joginder
AU - Prasad, Ram
AU - Kapoor, Dhriti
TI - Stress Ameliorative Effects of Indole Acetic Acid on Hordeum vulgare L. Seedlings Subjected to Zinc Toxicity
T2 - Phyton-International Journal of Experimental Botany
PY - 2020
VL - 89
IS - 1
SN - 1851-5657
AB - The heavy metals present in the environment accumulate in the plants
and affect their productivity and yield. By entering the food chain, metals cause
several serious health problems in human beings as well as in other organisms.
Indole acetic acid (IAA) is known to act as a signaling molecule between symbiotic
association of metal accumulating plants and plant growth promoting rhizobacteria
(PGPR). Present study demonstrated a protective role of IAA against surplus Zinc
(Zn)-induced toxicity to Hordeum vulgare seedlings. Elevated Zn concentrations
suppressed the plant growth, caused a reduction in leaf relative water contents
(RWC) and elevated free proline and non-protein thiols (NPT) accumulation. Zinc
treatment also led to enhanced lipid peroxidation (MDA contents) as well as the
activity of ascorbate peroxidase (APX), showing the involvement of antioxidative
defense mechanism to reduce Zn induced toxicity. IAA oxidase activity was also
observed to increase due to Zn treatment. IAA pretreatment of H. vulgare caryopsis
could partly revert the Zn-induced toxicity in seedlings.
KW - Heavy metals; phytohormone; lipid peroxidation; non-protein thiols (NPT); relative water contents (RWC); free proline; ascorbate peroxidase (APX); IAA oxidase
DO - 10.32604/phyton.2020.07180