Low pH stress activates several genes for lateral root formation and detoxification of aluminum ions in Cotton plants
Year: 2023
Type: article
Abstract: In highly acidic soils (pH<5), Al is solubilized into a phytotoxic form Al(H2O)63+ and inhibits the plant root growth and development. Under Al toxic conditions, the organic acid transporters in plasma membrane are involved in organic acid release and form non phytotoxic stable complexes with Al3+ in the rhizosphere. The study showed that, under hydroponics conditions; the Cotton seedlings exhibited very sensitive phenotypes to acid soil stress conditions [pH and Al stress], the seedlings displayed retarded primary, secondary root growth and small cotyledons. These results indicated that Cotton plants are sensitive to acid soil. Consequently, Al3+ toxicity is considered as a primary constraint factor for crop production under acid soil environment. As a whole without fine divisions the root system becomes corraloid in structure which will be having squat secondary roots. Plant has developed a natural defence mechanism in order to combat this venomous environment. Expression profile and organic acid exudates studies clearly revealed that GhALMT1 and GhALS3 both the genes are involved in Al3+ detoxification mechanisms. The remarkable expression was detected for GhALS3 under both low pH stress and aluminium stress condition in comparison to wild type untreated control whereas GhALMT1 expression was only activated under Al3+ stress conditions. Our study, displayed enhanced citrate and malate excretion values in the wild type plants which are treated with Al and H+ stress. Thus, it can be clearly mentioned that GhALMT1 and GhALS3 is playing a significant role in acid soil stress tolerance of cotton plant.
Source: Plant Stress
Authors: Atreyee Kundu, Markkandan Ganesan
Institution: Techno India University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: gold
Estimated APC paid: $1,400
OpenAlex ID: W4385163336