Exogenous application of plant growth regulators (PGRs) induces chilling tolerance in short-duration hybrid maize

Waqas, Muhammad; Khan, Imran; Akhter, Muhammad Javaid; Noor, Mehmood Ali; Ashraf, Umair

doi:10.1007/s11356-017-8768-0

Cited by 75 publications

(42 citation statements)

References 61 publications

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“…Exogenous application of natural and synthetic plant growth regulators [104] is an important and quick agronomic approach to reduce the negative impact of temperature stress [104]. PGRs (Hydrogen peroxide, ascorbic acid, salicylic acid, Moringa leaf extract) significantly enhanced the cotton yield under heat stress by potentiating the cell membranes and enhancing the antioxidant defense [41].…”

Section: Agronomic Practicesmentioning

confidence: 99%

Temperature Extremes in Cotton Production and Mitigation Strategies

Zafar¹,

Noor²,

Waqas³

et al. 2018

Past, Present and Future Trends in Cotton Breeding

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Cotton is an important cash crop, providing raw material for different industries and plays crucial role in the economy of several countries. It requires optimum temperature for economic production and causes reduced yield otherwise. Extreme temperature, more importantly, high temperature causes serious yield reduction in cotton by affecting its physiology, biochemistry and quality leading to poor agronomic produce. Freezing temperature also affect the germination percentage and seedling establishment. Several breeding and genomics based studies were conducted to improve the cotton production under high and low temperature stress in cotton. Here we overviewed several agronomic practices to mitigate the effect of extreme temperature, and multiple breeding and molecular approaches to enhance the genetic potential of cotton for temperature tolerance by Marker assisted selection or transgenic approach.

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Section: Agronomic Practicesmentioning

confidence: 99%

Temperature Extremes in Cotton Production and Mitigation Strategies

Zafar¹,

Noor²,

Waqas³

et al. 2018

Past, Present and Future Trends in Cotton Breeding

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“…Maize is one of the world's most important summer crops, which is used not only as a staple food crop but also as animal feed, bioenergy, and industrial crop [1]. In recent years, it is rapidly transforming into an economically vital industrial commodity in Asia [2], and with the rapid expansion of the global population, the demand for maize is further rising [1]. In China, the majority of the maize-cultivated areas are dominated in the arid and semiarid region of the northwestern Loess Plateau, characterized by low rainfall and water scarcity, and drought span often prevails during the maize growing periods [3].…”

Section: Introductionmentioning

confidence: 99%

Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage

Kamran

Ahmad

et al. 2020

Agronomy

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In the present study, we examined the potential role of paclobutrazol in delaying leaf senescence, in causing changes in the activities of antioxidants, and in the maintenance of photosynthetic activity during the senescence process, and, therefore, on the grain yield of maize under semiarid field conditions. Maize seeds were pretreated with 0 (CK), 200 (PS1), 300 (PS2), and 400 (PS3) mg paclobutrazol L−1. Our results indicated that elevated levels of reactive oxygen species (ROS) and higher accumulation of malondialdehyde (MDA) contents were positively associated with accelerated leaf senescence during the grain-filling periods. The leaf senescence resulted in the disintegration of the photosynthetic pigments and reduced the net photosynthetic rate after silking. However, the resultant ROS burst (O2− and H2O2) was lessened and the leaf senescence and chlorophyll degradation were evidently inhibited in leaves of paclobutrazol-treated maize plants, which was strongly linked with upregulated activities of antioxidant enzymes in treated plants. The enhanced chlorophyll contents and availability of a greater photosynthetic active green leaf area during the grain filling period facilitated the maintenance of higher photosynthetic rate, and light-harvesting efficiency of photosynthesis associated with photosystem II (PSII) resulted in higher kernel number ear−1 and thousand kernel weights, and thus increased the final grain yield. The average maize grain yield was increased by 18.8% to 55.6% in paclobutrazol treatments, compared to untreated control. Among the various paclobutrazol treatments, PS2 (300 mg L−1) treatment showed the most promising effects on enhancing the activities of antioxidative enzymes, delaying leaf senescence and improving the yield of maize. Thus, understanding this effect of paclobutrazol on delaying leaf senescence introduces new possibilities for facilitating yield improvement of maize under semiarid conditions.

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“…Inbred maize lines showed different responses to LT (Guan et al 2009): LT-tolerant genotypes were highly resistant to LT stress and recovered faster from LT damage (Aguilera et al 1999). In addition to innate cold tolerance, many chemicals have been used to reduce LT effects in maize (Waqas et al 2017). Salicylic acid (SA 0.5 mmol L -1 ) applied to the radicles increased LT tolerance of the aerial portion of maize (Kang and Saltveit 2002).…”

Section: Introductionmentioning

confidence: 99%

Effects of variety and chemical regulators on cold tolerance during maize germination

Wang

Zhang

Wang

et al. 2018

Journal of Integrative Agriculture

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Maize growth and development is affected by low temperature (LT) especially at the early stages of development. To describe the response of different varieties to LT stress and determine an effective method to cope with LT stress, maize hybrids Zhengdan 958 (ZD 958) and Danyu 39 (DY 39) were planted and grown at 10 and 25°C, respectively. Effects of the chemicals potassium chloride (KCl), gibberellin (GA 3), 2-diethylaminoethyl-3, 4-dichlorophenylether (DCPTA), and all three combined chemicals (KGD) on coping with LT stress were tested by seed priming. The varieties performed significantly differently at 10°C. Compared to leaf, root growth was more severely affected by LT stress. Root/leaf ratio is likely a more reliable parameter to evaluate cold tolerance based on its close correlation with leaf malondialdehyde (MDA) content (R=-0.8). GA 3 advanced seed germination by about 2 days compared with control treatment of water. GA 3 and DCPTA both resulted in lower leaf MDA content and higher leaf and root area and root/leaf ratio. KCl resulted in the highest evenness of plant height. KGD performed the best in increasing cold tolerance of maize morphologically and physiologically. Strategies to increase maize tolerance of cold stress, such as variety breeding or chemical selection, would increase maize yield especially at high-latitude regions and have great implications for food security.

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Exogenous application of plant growth regulators (PGRs) induces chilling tolerance in short-duration hybrid maize

Cited by 75 publications

References 61 publications

Temperature Extremes in Cotton Production and Mitigation Strategies

Temperature Extremes in Cotton Production and Mitigation Strategies

Paclobutrazol Application Favors Yield Improvement of Maize Under Semiarid Regions by Delaying Leaf Senescence and Regulating Photosynthetic Capacity and Antioxidant System During Grain-Filling Stage

Effects of variety and chemical regulators on cold tolerance during maize germination

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