scholarly journals ​Impact of Foliar Spray of Plant Growth Retardants with Potassium on Growth Traits, Gas Exchange Parameters and Grain Yield in Foxtail Millet (Panicum italicum L.)

2021 ◽  
Author(s):  
R. Sivakumar ◽  
P. Parasuraman ◽  
M. Vijayakumar
Keyword(s):  
Plant Growth ◽  
Grain Yield ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Foxtail Millet ◽  
Foliar Spray ◽  
Growth Retardants ◽  
Gas Exchange Parameters ◽  
Plant Growth Retardants ◽  
Source Sink

Background: Foxtail millet is one of the nutri-cereal foods for the people of semi arid regions. Proper nutrient management and source-sink alteration are major keys for achieving higher productivity in millets. However, potassium is not recommended to foxtail millet and the potential yield is not exploited. And also the study of source-sink alteration in foxtail millet by using plant growth regulators is meager. Methods: An experiment was conducted to study the impact of plant growth retardants viz., chlormequat chloride (CCC) and mepiquat chloride (MC) with the nutrient potassium (K2SO4 - 1%) on growth, gas exchange parameters and grain yield of foxtail millet under rainfed condition. Plant growth retardants with potassium consortium were used as foliar spray at flower initiation stage under field condition. Standard methods were used to measure the plant height, root length, number of leaves, LAD, CGR and grain yield. The photosynthetic rate, transpiration rate and leaf temperature were measured by using the instrument PPS. Result: Foliar spray of CCC (250 ppm) with 1% K2SO4 showed supremacy to enhance crop growth rate, leaf area duration, photosynthetic rate, transpiration rate and grain yield compared to other treatments. However, lowest plant height (100.7 cm) and number of leaves were observed by CCC (250 ppm) alone. Highest photosynthetic rate (26.84) and transpiration rate (17.94) were registered by CCC + K2SO4. Lowest leaf temperature of 34.1ºC was registered by 1% K2SO4 compared to control (35.6°C). CCC with K2SO4 recorded highest LAD value of 46.1 which is on par with K2SO4 alone (45.9). CCC with K2SO4 registered highest grain yield of 2.13 t ha-1 with increased yield of 18.3% over control. However, highest benefit cost ratio of ratio of 2.75 was recorded by 1% K2SO4 alone.

scholarly journals Paclobutrazol or Ancymidol Effects on Postharvest Performance of Potted Ornamental Plants and Plugs

HortScience ◽  
2015 ◽  
Vol 50 (9) ◽  
pp. 1370-1374 ◽  
Author(s):  
Iftikhar Ahmad ◽  
Brian E. Whipker ◽  
John M. Dole
Keyword(s):  
Plant Growth ◽  
Shelf Life ◽  
Stem Elongation ◽  
Ornamental Plants ◽  
Growth Control ◽  
Foliar Spray ◽  
Dry Weight ◽  
Growth Retardants ◽  
Potted Plants ◽  
Plant Growth Retardants

Effects of paclobutrazol and ancymidol on postharvest performance and growth control of potted sunflower (Helianthus annuus L.), zinnia (Zinnia elegans Jacq.) and marigold (Tagetes erecta L.), petunia (Petunia ×hybrida Vilm.) plugs, respectively, were studied. Paclobutrazol was applied as a drench at 0, 1.0, 2.0, or 4.0 mg of a.i. per 15.2-cm pot for sunflower and 0, 0.5, 1.0, or 2.0 mg per 12.5-cm pot for zinnia, while ancymidol was applied at 0, 40, 80, and 160 mg·L−1 with a volume of 0.21 L·m−2 as a foliar spray for marigolds or petunia plug crops. With an increase in paclobutrazol dose or ancymidol concentration, plant growth (plant height and diameter, shoot fresh or dry weight) was controlled for all species tested. Use of 1.0–2.0 mg paclobutrazol per pot produced 21% to 28% shorter plants with 12% to 15% smaller plant diameter, 13% to 19% less shoot fresh weight, 15% to 21% less dry weight, and darker green foliage color for potted sunflower than nontreated plants. Treatment with 1.0–4.0 mg paclobutrazol per pot delayed first wilting by 0.7–1.4 days compared with nontreated plants. For zinnia, 0.5–1.0 mg paclobutrazol controlled plant growth, produced dark green foliage, and extended shelf life by delaying first wilting by 2.6–3.9 days and second wilting by 1.4–2.0 days than nontreated plants. For marigold and petunia plugs, 40–80 mg·L−1 ancymidol provided ample growth control with darker green foliage; however, postharvest longevity was extended only when plugs were sprayed with 160 mg·L−1 ancymidol. During simulated storage and shipping, plant growth retardants maintained darker green foliage for potted sunflower, zinnia, and marigold plugs and prevented postharvest stem elongation of petunia plugs. In summary, use of plant growth retardants effectively controlled excessive plant growth and extended shelf life of potted plants and plugs.

scholarly journals The Dwarfing Effects of Different Plant Growth Retardants on Magnolia wufengensis L.Y. Ma et L. R. Wang

Forests ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 19
Author(s):  
Xiaodeng Shi ◽  
Siyu Chen ◽  
Zhongkui Jia
Keyword(s):  
Plant Growth ◽  
Soluble Sugar ◽  
Control Group ◽  
Growth Retardants ◽  
Sod Activity ◽  
Node Number ◽  
Plant Growth Retardants ◽  
One Year ◽  
Prohexadione Calcium ◽  
Magnolia Wufengensis

The effects of varieties, concentrations, and number of applications of plant growth retardants (PGRs) on the morphological, physiological, and endogenous hormones of Magnolia wufengensis L.Y. Ma et L. R. Wang were assessed to obtain the most suitable dwarfing protocol for M. wufengensis and to provide theoretical support and technical guidance for the cultivation and promotion of this species. One-year-old M. wufengensis ‘Jiaohong No. 2’ grafted seedlings served as the experimental materials. In the first part of the experiment, three PGRs (uniconazole, paclobutrazol, prohexadione calcium), three concentrations (500, 1000, 1500 ppm), and three applications (one, three, and five applications) were applied in dwarfing experiments to perform L9 (34) orthogonal tests. In the second part of the study, dwarfing experiments were supplemented with different high uniconazole concentrations (0, 1500, 2000, 2500 ppm). Spraying 1500 ppm uniconazole five times achieved the best M. wufengensis dwarfing effect, related indicators of M. wufengensis under this treatment were better than other treatment combinations. Here, M. wufengensis plant height, internode length, scion diameter, and node number were significantly reduced by 56.9%, 62.6%, 72.8%, and 74.4%, respectively, compared with the control group. This treatment increased superoxide dismutase (SOD) activity by 66.0%, peroxidase (POD) activity by 85.0%, soluble protein contents by 43.3%, and soluble sugar contents by 27.6%, and reduced malondialdehyde (MDA) contents by 32.1% in leaves of M. wufengensis compared with the control. The stress resistance of M. wufengensis was enhanced. The treatment also reduced gibberellin (GA3) levels by 73.0%, auxin (IAA) by 58.0%, and zeatin (ZT) by 70.6%, and increased (abscisic acid) ABA by 98.1% in the leaves of M. wufengensis. The uniconazole supplementation experiment also showed that 1500 ppm was the optimal uniconazole concentration. The leaves exhibited abnormalities such as crinkling or adhesion when 2000 or 2500 ppm was applied. Given the importance of morphological indicators and dwarfing for the ornamental value of M. wufengensis, the optimal dwarfing treatment for M. wufengensis was spraying 1500 ppm uniconazole five times.

scholarly journals Sites of Action of Plant Growth Retardants on Cholesterol Biosynthesis by Cell-Free Rat Liver .Preparations

1970 ◽  
Vol 23 (5) ◽  
pp. 1115 ◽  
Author(s):  
LG Paleg
Keyword(s):  
Plant Growth ◽  
Rat Liver ◽  
Cholesterol Biosynthesis ◽  
Growth Retardants ◽  
One Step ◽  
Plant Growth Retardants ◽  
Sites Of Action ◽  
Amo 1618

Experiments with cell-free preparations of rat liver indicate that of the plant growth retardants Phosfon B, Phosfon D, B995, COlI, and Amo 1618 all but B995 inhibit at least one step between acetate and mevalonate in cholesterol biosynthesis. The results also demonstrate that all of the retardants, including B995, inhibit at least one step between mevalonate and cholesterol, and that several of them act at different points along this part of the biosynthetic sequence.

Computational-Aided Discovery of Novel 1,3-Benzodioxole Plant Growth Retardants

2019 ◽  
Vol 39 (2) ◽  
pp. 888-896
Author(s):  
Jine Wang ◽  
Zhikun Yang ◽  
Hongxia Duan ◽  
Liusheng Duan ◽  
Weiming Tan
Keyword(s):  
Plant Growth ◽  
Growth Retardants ◽  
Plant Growth Retardants
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