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Gilley, Angela; Fletcher, R. A.

doi:10.1023/a:1005804717016

Cited by 39 publications

(4 citation statements)

References 13 publications

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“…Measurement of chlorophyll fluorescence has become one of the most powerful and widely used means for obtaining information about the state of PSII and provides insight into the plant's ability to tolerate environmental conditions that can damage photosynthetic apparatus and decrease yield [7,16]. Gilley and Fletcher [51] have reported that chlorophyll fluorescence ratio (Fv/Fm) is strongly correlated with photosynthetic efficiency and a decline in this rate is a remarkable characteristic of photosynthesis inhibition. Chlorophyll fluorescence transiently increases in the newly expanding leaves and decrease significantly with leaf senescence [52].…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…These changes lead to more rapid cell growth and division and, as a result, the number of roots increases (Husen and Pal, 2007). PBZ belongs to the triazole family which includes hormones that act as plant multiprotectants against stresses (Gilley and Fletcher, 1997). The role of PBZ in root initiation is still unknown, but it acts as an antigibberellin in plants (Kefford, 1973).…”

Section: Number Of Rootsmentioning

confidence: 99%

Assessing the response of indigenous loquat cultivar Mardan to phytohormones for in vitro shoot proliferation and rooting

Abbasi

Pervaiz

Hafiz

et al. 2013

J. Zhejiang Univ. Sci. B

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Abstract:In vitro cultures of loquat cultivar Mardan were established using shoot apices after treating with NaOCl (5%, 7%, 10%, 12%, 14% (v/v)) for 12 min and HgCl 2 (0.01%, 0.05%, 0.10%, 0.20%, 0.25% (w/v)) for 2 min. A maximum survival rate of 70% was recorded after surface sterilization with 10% NaOCl. Caulogenic response was assessed on Murashige and Skoog (MS) medium fortified with assorted combinations of the cytokinins, benzylaminopurine (BAP), kinetin, and N6-(2-isopentyl)adenine (2iP). Treatment of BAP 1.5 mg/L combined with 2iP 9.0 mg/L and kinetin 1.5 mg/L was found to be optimum for shoot morphogenesis in terms of the number and subsequent growth of shoots, while the highest shoot length was yielded by the combination of BAP 0.5 mg/L, kinetin 0.5 mg/L, and 2iP 3 mg/L. Higher levels of cytokinins induced callogenesis, vitrification and stunted growth to some extent. For rhizogenesis, uniform sized micro-shoots were excised and transferred to half-strength MS medium containing auxins. The best rooting expression was observed with naphthaleneacetic acid (NAA) 1 mg/L combined with indole-3-butyric acid (IBA) 2 mg/L and paclobutrazol (PBZ) 1 mg/L.

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“…____________________________________________________________________________________________________________________ Moreover, it can also decrease the decline in panicle weight and grain weight. PAC application can reduce the size of plants and increase the ability to resist both abiotic and biotic stresses, such as drought, salinity, flooding, cold, heat, and herbicides stress (Mohammadi et al 2017;Rademacher 1995;Fletcher et al 2000;Gilley & Fletcher 1997;Baninasab 2009;Hunter & Proctor 1994). Some studies showed that PAC could protect plants exposing to environmental stress by improving tissue compactness and physiological and biochemical activities (Baninasab 2009;Navarro et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Influence of Paclobutrazol on the Growth and Photosynthesis of Sequoia sempervirens Seedlings

Zhan

et al. 2019

Journal of Horticultural Research

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Paclobutrazol (PAC), as a commonly used plant regulator, has the important function of improving the plant’s stress resistance. Sequoia sempervirens Endl. is a large caliber, fast-growing timber species and one of the world’s five major landscaping tree species. This study researched the effects of spraying PAC on the growth and photosynthetic activity of S. sempervirens seedlings. The results showed the plant height and the plant crown diameter were decreased significantly with the increase in PAC concentration (500 – 3,000 mg·dm−3). However, the ground shoot diameter, net photosynthetic rate, stomatal conductance, inter-cellular CO2 concentration, transpiration rate, actual photochemical quantum yield, and photosynthetic electron transport rate all showed the trend of increasing first reaching the maximum at 2,000 mg·dm−3 and then decreased. Water use efficiency showed the opposite trend. Spraying 2 times was better than once. The conclusion suggests that PAC can protect the photosynthetic activity and improve the resistance of S. sempervirens seedlings under natural cooling and draught in autumn and winter.

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Untitled

Cited by 39 publications

References 13 publications

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

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

Assessing the response of indigenous loquat cultivar Mardan to phytohormones for in vitro shoot proliferation and rooting

Influence of Paclobutrazol on the Growth and Photosynthesis of Sequoia sempervirens Seedlings

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