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    Adaptability and Yield Potential of Different Species of Amaranth under Semiarid Conditions
    (Friends Science Publ, 2020) Nazeer, Samreen; Basra, Shahzad M. A.; Iqbal, Shahid; Mateen, Ahmad; Hafeez, Muhammad Bilal; Akram, Muhammad Zubair; Zahra, Noreen
    Amaranth, being a nutrient-rich and climate resilient crop, can be a solution to improve nutritional quality and food security for increasing population. Aims of this study were to check the adaptability and yield potential of amaranth under semiarid climate conditions of Pakistan. This two-year field experiment was conducted at Directorate Research Area, University of Agriculture, Faisalabad. Germplasm of amaranth (ten genotypes) was imported from USDA and grown under semiarid environment to compare their phenology, leaf biochemical analysis and yield attributes in order to access its adaptability. Significant variations were observed among the genotypes for yield related attributes, leaf chlorophyll contents and phenology. Among genotypes, maximum grain yield was produced by PI 642733 followed by PI 619265, PI 636194 and Ames 15204. This was linked with stay green character (more leaf chlorophyll contents) of genotypes for longer period, as depicted by more seed setting periods of high yielder genotypes. Genotypes completed seed setting between 112 to 128 days after emergence. Furthermore, seed protein contents ranged between 11.73 to 19%. Genotypes PI 642733, PI 619265, PI 636194 and Ames 15204 were found promising and recommended to be grown in Rabi crop season in Faisalabad conditions. Huge diversity observed in the germplasm of amaranth which opened new avenues for the selection and production of suitable germplasm under different agro-ecological zones of Pakistan. (C) 2020 Friends Science Publishers
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    Gene regulation in halophytes in conferring salt tolerance
    (Elsevier, 2020) Hafeez, Muhammad Bilal; Raza, Ali; Zahra, Noreen; Shaukat, Kanval; Akram, Muhammad Zubair; Iqbal, Shahid; Basra, Shahzad Maqsood Ahmed
    Salinity is one of the significant stresses that affect all the metabolic and physiological aspects of all the plants, and on this consistency, some genes are upregulated, and some are downregulated to confer salt stress. In this aspect, halophytes are enriched with all the essential machinery to overcome salt stress by switching genetic pathways that inhibits the entry of toxic ions (Na+ ions and Cl- ions), or by compartmentalization of these ions in subcellular organelles, which not only protect the plants at germination stage but also provide protecting shield at growth and developmental level. Na+ flux entered from roots to leaves, and it enters at cellular level accomplished via KUP/HAK/KT, KT, HKT1, AKTI, and NSCCs (nonspecific cation channels) transporters. Available literature indicates that at germination stage, Cdc2-related protein, Vp1 and MIP proteins (proteins of aquaporins) related to transcripts, and DOG1, AB15, and RGL2 genes are upregulated in halophytes. Besides, at developmental stages glycine-rich RNA-binding proteins (SvGRP1 and SvGRP2), APX (ascorbate peroxidase) gene, TsApx6 is switched on to overcome salinity stress. In this content, cytoplasmic damage is controlled by the upregulation of genes involved in ionic compartmentalization such as NHX, CLC, and AQP. Furthermore, SOS, HA1, NHX, VAMP, CLC, PIP, SOS1, PIP (aquaporin involved in salt secretion), and TIP genes are upregulated for salt secretion; a specific attribute is only related to halophytes. Moreover, for intragenic recycling roots hydrophobic barriers genes cytochrome P450 (involved in the hydrophobic root barrier) SOS1 and AoCYP86B1 are switched on. The damaging effect of salt can be at least, and partially reversed by the expression of these genes in glycophytes and other halophytes. These findings have enormous implications for growing halophytes and glycophytes in the areas where salinity is a major limiting factor for plant growth and development. © 2021 Elsevier Inc. All rights reserved.
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    Physiological and molecular responses to high, chilling, and freezing temperature in plant growth and production: consequences and mitigation possibilities
    (Springer International Publishing, 2021) Zahra, Noreen; Shaukat, Kanval; Hafeez, Muhammad Bilal; Raza, Ali; Hussain, Sadam; Chaudhary, Muhammad Tanees; Akram, Muhammad Zubair
    Temperature is the main factor that determines the geographical distribution of plants both in the context of altitudinal and latitudinal gradients. Temperature is a primary physical factor affecting the rate of plant growth and development in all the species across different regimes. Prolonged extreme temperatures, either temperatures below and above certain thresholds during critical periods of developmental stages, have severe consequences on plant productivity and grain quality. In addition to flowering time, low temperature (LT) causes short hypocotyls and compact rosettes, and higher temperature causes lower viability of pollens and anthers, thereby causing severe economic losses. It alters the plant metabolism, and this short-/long-term modulation after exposure to high temperature (HT), low temperature (LT), and freezing temperature (FT) affects the important macromolecules (DNAs, protein) and super molecules (membranes, chromosomes). To combat the adversities of extreme temperature antioxidants activities, photosynthetic assimilate transport and heat shock proteins (HSPs) activation causes direct and indirect acclimation, thus protecting plants and enhancing plant growth and productivity. The responses of plants under temperature fluctuations have been widely investigated; however, in-depth studies related to adaptive responses of the plant at the molecular and physiological level are still lacking. Plants acquire resistance to every single degree increase/decrease in temperature by modulating genetic makeup and underlying key physiological processes. This chapter aims to document parallel-in-time changes during extreme temperature, and exploring new advancement in biotechnological tools to enhance plant tolerance at the genomic level, which could lead to the generation of new resistant/tolerant varieties with sustainable yield and production. Therefore, in this chapter, we underline and summarize the recent progress in the physiological, biochemical, and molecular responses as tolerance mechanisms under HT, LT, and FT. Moreover, some mitigation approaches, such as QTLs, GWAS, MAS, PGRs, and plant leaf extracts, are also discussed in detail. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2021. All rights reserved.