ORCID Profile
0000-0002-4300-3813
Current Organisation
University of Agriculture Faisalabad
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Publisher: Elsevier BV
Date: 2011
Publisher: CSIRO Publishing
Date: 2009
DOI: 10.1071/CP08427
Abstract: Maize is a C4 plant species with higher temperature optima than C3 plant species. Growth and productivity of maize are severely constrained by chilling stress. Here, we review the effects of chilling stress on growth, phenology, water and nutrient relations, anatomy, and photosynthesis in maize. Several management strategies to cope with chilling stress are also proposed. In maize, chilling stress is known to reduce leaf size, stem extension and root proliferation, disturb plant water relations, and impede nutrient uptake. Chilling stress in maize is a complex phenomenon with physiological and biochemical responses at both cellular and whole-organ level. CO2 assimilation by leaves is reduced mainly due to membrane damage, photoinhibition, and disturbed activity of various enzymes. Enhanced metabolite flux through the photorespiratory pathway increases the oxidative load on tissues as both processes generate reactive oxygen species (ROS). Injury caused by ROS to macromolecules under chilling stress is one of the major deterrents to growth. Low-molecular-weight osmolytes, including glycinebetaine, proline, and organic acids, are crucial in sustaining cellular function under chilling stress. Plant growth substances such as salicylic acid, gibberellic acid, and abscisic acid modulate the response of maize to chilling stress. Polyamines and several enzymes act as antioxidants and reduce the adverse effects of chilling stress. Chilling tolerance in maize can be managed through the development and selection of chilling-tolerant genotypes by breeding and genomic approaches. Agronomic approaches such as exogenous application of growth hormones and osmoprotectants to seeds or plants, and early vigour, can also aid in chilling tolerance.
Publisher: Springer Science and Business Media LLC
Date: 05-07-2023
Publisher: Institute of Experimental Botany
Date: 11-2018
Publisher: Informa UK Limited
Date: 20-09-2016
Publisher: Wiley
Date: 05-11-2014
DOI: 10.1111/PCE.12210
Abstract: Recent studies have identified genotypic variation in phosphorus (P) efficiency, but rarely have the underlying mechanisms been described at the molecular level. We demonstrate that the highly P-efficient wheat (Triticum aestivum L.) cultivar Chinese 80-55 maintains higher inorganic phosphate (Pi ) concentrations in all organs upon Pi withdrawal in combination with higher Pi acquisition in the presence of Pi when compared with the less-efficient cultivar Machete. These findings correlated with differential organ-specific expression of Pi transporters TaPHT1 , TaPHT1 , TaPHT1 , TaPHT2 and H(+) -ATPase TaHa1. Observed transcript level differences between the cultivars suggest that higher de novo phospholipid biosynthetic activities in Pi -limited elongating basal leaf sections are another crucial adaptation in Chinese 80-55 for sustaining growth upon Pi withdrawal. These activities may be supported through enhanced breakdown of starch in Chinese 80-55 stems as suggested by higher TaGPho1 transcript levels. Chinese 80-55 fine roots on the other hand show strong suppression of transcripts involved in glycolysis, transcriptional regulation and ribosomal activities. Our work reveals major differences in the way the two contrasting cultivars allocate Pi and organic P compounds between source and sink tissues and in the acclimation of their metabolism to changes in Pi availability.
Publisher: Public Library of Science (PLoS)
Date: 17-10-2018
Publisher: Informa UK Limited
Date: 25-09-2018
Publisher: Wiley
Date: 11-11-2014
DOI: 10.1111/PCE.12450
Abstract: Study of plants with unusual phosphorus (P) physiology may assist development of more P-efficient crops. Ptilotus polystachyus grows well at high P supply, when shoot P concentrations ([P]) may exceed 40 mg P g(-1) dry matter (DM). We explored the P physiology of P. polystachyus seedlings grown in nutrient solution with 0-5 mM P. In addition, young leaves and roots of soil-grown plants were used for cryo-scanning electron microscopy and X-ray microanalysis. No P-toxicity symptoms were observed, even at 5 mM P in solution. Shoot DM was similar at 0.1 and 1.0 mM P in solution, but was ∼14% lower at 2 and 5 mM P. At 1 mM P, [P] was 36, 18, 14 and 11 mg P g(-1) DM in mature leaves, young leaves, stems and roots, respectively. Leaf potassium, calcium and magnesium concentrations increased with increasing P supply. Leaf epidermal and palisade mesophyll cells had similar [P]. The root epidermis and most cortical cells had senesced, even in young roots. We conclude that preferential accumulation of P in mature leaves, accumulation of balancing cations and uniform distribution of P across leaf cell types allow P. polystachyus to tolerate very high leaf [P].
Publisher: Informa UK Limited
Date: 06-2006
Publisher: Springer Science and Business Media LLC
Date: 09-03-2020
DOI: 10.1038/S41598-020-61147-3
Abstract: Phosphorus (P) is a non-renewable resource which may be depleted within next few decades hence high P use efficiency is need of time. Plants have evolved an array of adaptive mechanisms to enhance external P acquisition and reprioritize internal utilization under P deficiency. Tissue specific biomass and P allocation patterns may affect the P use efficiency in plants. six rice cultivars were grown in solution culture for 20 days and then were ided into two groups to receive either adequate P or no P that were harvested at 30, 40 and 50 days. Plants were dissected into various tissues/organs. Two rice cultivars viz Super Basmati (P-inefficient) and PS-2 (P-efficient) were grown in soil with no or 50 mg P kg −1 soil till maturity. Rice cultivars PS-2 and Basmati-2000 had higher P uptake, utilization efficiency and internal remobilization than other tested cultivars after P omission. Young leaves and roots were the major sinks while stems and mature leaves were the sources of P during P omission. In conclusion, biomass allocation and P accumulation among various tissues and P remobilization were major factors responsible for P efficiency.
Publisher: Springer Berlin Heidelberg
Date: 18-09-2013
Publisher: Pakistan Journal of Agricultural Sciences
Date: 04-2016
Location: Pakistan
No related grants have been discovered for Tariq Aziz.