Ameliorating heat stressed conditions in wheat by altering its physiological and phenotypic traits associated with varying nitrogen levels

Authors

  • Muhammad SHAUKAT Allama Iqbal Open University, Faculty of Sciences, Department of Agricultural Sciences, Islamabad, 44000 (PK)
  • Asim ABBASI Kohsar University Murree, Department of Environmental Sciences, Murree 47150 (PK) https://orcid.org/0000-0003-2731-0490
  • Kashaf RAMZAN University of Agriculture, Department of Horticulture, Faisalabad 38040 (PK)
  • Aiman HINA Nanjing Agricultural University, Soybean Research Institute, Ministry of Agriculture (MOA) Key Laboratory of Biology and Genetic Improvement of Soybean (General), MOA National Centre for Soybean Improvement, State Key Laboratory for Crop Genetics and Germplasm Enhancement, Nanjing 210095 (CN)
  • Shafique Q. MEMON Allama Iqbal Open University, Faculty of Sciences, Department of Agricultural Sciences, Islamabad, 44000 (PK)
  • Zarish MAQSOOD Allama Iqbal Open University, Faculty of Sciences, Department of Biology, Islamabad 44000 (PK)
  • Abdel-Rhman Z. GAAFAR King Saud University, College of Science, Department of Botany and Microbiology, P.O. Box 11451, Riyadh (SA)
  • Mohamed S. HODHOD October University for Modern Sciences & Arts, Faculty of Biotechnology, 6th October City, 12566 (EG)
  • Sobhi F. LAMLOM Alexandria University, Faculty of Agriculture (Saba Basha), Plant Production Department, Alexandria 21531 (EG)

DOI:

https://doi.org/10.15835/nbha52113471

Keywords:

heat stress, N rates, phenotypic traits, physiological traits, wheat

Abstract

Currently, more than half of the global nations cultivating wheat crops are facing severe consequences of climate change and its associated heat stress in terms of quantitative and qualitative yield losses. Plants exposed to heat stress need a balanced and adequate amount of mineral nutrients to counter its ill effects. Therefore, the present study was designed to investigate the potential effects of heat stress applied during the vegetative growth period (Zadoks growth scale: ZGS 5-60) on physiological and phenotypic traits of wheat (Triticum aestivum) crop subjected to variable rates of nitrogen (N). In this experiment, wheat plants of cv. ‘Punjab-2011’ were exposed to two levels of temperature i.e. heat stress (HS) and control or non-heat stress (NHS), and three N rates (N50 = 50 kg ha-1, N100= 100 kg ha-1 and N150 = 150 kg ha-1). The experiment was executed under controlled conditions in a completely randomized design (CRD) with six replications. One set of eighteen pots containing wheat seedlings was placed in a compartment of the greenhouse under heat-stressed conditions, while another set was placed in another compartment under non-heated conditions. The greenhouse compartments were equipped with a heating and cooling system to maintain desired ecological conditions. Pots in heated chamber were kept for 60 days from emergence (ZGS = 5-60), and then shifted to non-heated chamber till harvesting. The temperature in heat stress treatment was almost 2 ± 0.47 °C higher than in non-heated treatment. The results indicated that HS significantly reduced the photosynthetic rate by 42.52%, leaf photosynthetic efficiency by 56.82%, chlorophyll scores by 20.11%, relative water contents (RWC) by 12.81%, tillers by 48.21%, grain weight by 21.47% and grain yield by 68.20% relative to NHS conditions. These reductions were more prominent in plants subjected to a limited N dose rate (50 kg N ha-1). Furthermore, the results also revealed higher transpiration rate, stomatal conductance, and membrane ruptures under HS with N50 treatment.  However, N150 treatment compensated for the detrimental effects of HS on wheat plants by improving the photosynthetic rate and efficiencies, higher RWC, more stability of membrane and pigments, more tillers, and higher grain weight, and grain yield of wheat. Additionally, grain yield was negatively correlated with transpiration rate, stomatal conductance, internal CO2 concentration, and membrane leakage. In conclusion, a high dose rate of N under high temperatures during vegetative growth could alleviate the magnitude of penalties to grain yield and enhance the potential of wheat crops to withstand heat-induced detrimental effects.

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Published

2024-02-14

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SHAUKAT, M., ABBASI, A., RAMZAN, K., HINA, A., MEMON, S. Q., MAQSOOD, Z., GAAFAR, A.-R. Z., HODHOD, M. S., & LAMLOM, S. F. (2024). Ameliorating heat stressed conditions in wheat by altering its physiological and phenotypic traits associated with varying nitrogen levels . Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 52(1), 13471. https://doi.org/10.15835/nbha52113471

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DOI: 10.15835/nbha52113471

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