Morphological-and-physiochemical-changes-of-jojoba-under-water-pollution-stress-condition

Title: Morphological and Physiochemical Changes of Jojoba under Water Pollution Stress Condition.
Published By: Polish Society for Horticultural Science since 1989, in Folia Horticulturae.
DOI: 10.2478/fhort-2024-0016
Authors: M. S. Aboryia, Mohamed Saleh M. Ali, and others.
Affiliations: Various universities in Egypt and Saudi Arabia.

Context: Water security is a major challenge for agricultural sustainability in Egypt.
Solution: Reuse of wastewater (raw agricultural drainage water - RADW, treated sewage drainage water - TSDW) for irrigation.
Study Duration: Conducted over two seasons (2022 and 2023) on 8-month-old jojoba plants.
Growth Parameters Examined:
- Plant height, stem diameter, shoot numbers.
- Leaf physical measurements and visual quality (VQ).
Chemical Components Investigated:
- Heavy metals (HMs), antioxidant capacity, ion leakage (IL%), and various leaf minerals and pigments.
Results: Jojoba plants tolerated irrigation with RADW up to 100% and TSDW up to 75%.

Water Challenges: Scarcity in arid and semi-arid regions, exacerbated by the construction of the Renaissance Dam in Ethiopia affecting Egypt's Nile water share.
Water Usage: Average per capita water usage in Egypt has fallen below critical levels.

Farmers often resort to using wastewater due to water shortages.
Risks of using untreated wastewater include effects on water, soil quality, and human health due to heavy metals.

Described as "green gold", it thrives in arid climates with deep roots enabling survival in dry conditions.
Commercial Value: Jojoba seed oil is utilized in cosmetics and aviation fuel.

Plant Sourcing: Shoot tips from female jojoba trees were propagated.
Soil Composition: Plants grown in a mixture of sand, clay, and compost.
Irrigation Treatments: Different concentrations of RADW and TSDW (25%, 50%, 75%, 100%) compared to control (tap water).

Growth parameters calculated for different stages (e.g., initial and final leaf counts).
Leaf area computed based on leaf size measurements.
VQ measured based on leaf damage severity using a ranking scale.
Chemical analyses for HMs, nitrogen, phosphorus, potassium, chlorophyll, carotenoids, proline, and more.

Growth Indices: Increases in NSI%, JHI%, JSDI% with varying levels of RADW.
Comparative Performance: RADW at 100% showed the highest growth compared to control; TSDW performance declined at 100% concentration.

Heavy Metal Accumulation: Increased in jojoba plants irrigated with RADW and TSDW, particularly aluminum and nickel.
Nutrient Concentration: Higher levels of N, P, and K in plants irrigated with both RADW and TSDW.
Pigment Content: Variations in chlorophyll and carotenoid levels in response to different concentrations of wastewater.

Higher proline levels, IL%, and MDA accumulation in response to increasing concentrations of wastewater.
Reactive Oxygen Species: Notable elevation of superoxide anion and hydrogen peroxide concentrations.

Water Stress Mechanisms: Jojoba's ability to tolerate high levels of HMs and pollution.
Antioxidant Defense: Enzymatic and non-enzymatic antioxidants mitigate oxidative stress.
Osmolyte Accumulation: Proline's role in maintaining osmotic balance under heavy metal stress.

Jojoba shows robust resilience against water pollution and can tolerate irrigation with RADW and TSDW at varying concentrations.
Future Recommendations: Investigate the effects of phytohormones on water stress resilience in jojoba plants.

Extensive citations relevant to water use, waste management, and plant responses to heavy metal stress.