Physiological Characterization of Six Wheat Genotypes for Drought Tolerance

Abstract

Pakistan is one of the most severely affected countries by Global climate change, it is an agriculture based country and its economy (21%) mainly depend on agriculture production. Wheat is the major staple food crop in Pakistan and takes key position in the national economy. It contribute 12.5% share in agriculture and 2.9% in the country’s GDP. Frequent droughts and scarcity of the water severely affecting the wheat production. To fulfill the feed requirements of rapidly growing population, it is necessary to explore the advanced genetic resource that can be able to perform better in changing climate. Six wheat genotypes were tested for their early seedling and physiological performance under different water stress environments. The seeds of six wheat genotypes (Khirman, Chakwal-86, MSH-36, DH-3/48, NIA Amber and NIA-10 10/8) were tested for physiological characterization under pot house experiment for individual genotypic response to water stress. The variance of analysis shows two-way interaction water stress [Control (normal four irrigations) and terminal drought (Soaking dose) and wheat genotypes (P≤ 0.05). Seven physiological indices, including Proline content, Glycine-betaine, Total sugars, Total chlorophyll, Nitrate Reductase Activity ((NRA), Potassium (K+) content, and Osmotic potential (OP) were used to evaluate the drought tolerance of six wheat genotypes. From the current data it was illustrated that, MSH-36 and DH-3/48 exhibited the tolerance followed by, Khirman and Chakwal-86 by maintaining their osmotic potential and accumulation of higher proline and glycine-betaine content that helpful for plant to enhancing their tolerance under water stress and to maintain their growth and development, whereas NIA Amber and NIA-10 10/8 are the drought sensitive genotypes as they could not maintain their osmotic potential under drought stress environment.

Responses of Mungbean to Water Deficit, Water use Efficiency and Drought Resistance

“…NRA activity varied from 11.40 µmol g -1 h -1 NO 2 (CO8) to 24.85 µmol g -1 h -1 NO 2 (VBN2) in control while in stressed plant it varied from 23.32 µmol g -1 h -1 NO 2 (CO6) to 47.42 µmol g -1 h -1 NO 2 (VBN2) (Fig 8). Muhammad et al, (2016) reported that NRA decreased with increasing water stress, maximum NRA were recorded at control level as compared to terminal drought in wheat genotypes.…”

Arbuscular mycorrhizal fungi and potassium fertilizer as plant biostimulants and alternative research for enhancing plants adaptation to drought stress: Opportunities for enhancing drought tolerance in cocoa (Theobroma cacao L.)

“…Potassium is also responsible in activating nitrate reductase; an enzyme critical for the production of protein in plants, regulating photosynthesis, water use efficiency, nitrogen uptake and protein building (Mandi et al, 2018;Nguyen et al, 2002). However, nitrate reductase is known to be sensitive to water stress because its metabolic pathway is regulated by water (Chachar et al, 2016;Lisar et al, 2012;Mujtaba et al, 2016;Zakariyya & Indradewa, 2018). Cakmak (2005) further provided an explanation for the increased need for K by plants suffering from drought stress.…”

Polyethylene Glycol Mediated Osmotic Stress on Germination, Seedling Traits and Seed Metabolic Efficiency of Wheat

“…Drought stress is responsible for either inhibition or delayed seed germination or seedling establishment (Balkan and Gençtan, 2013). It has negative effects on the morphological, physiological, and biochemical attributes of the wheat crop (Chachar et al, 2016) and it results in a significant reduction in overall production (Bilal et al, 2015 andAbid et al, 2018).…”