Anatomic Characterization and Photosynthetic Rate in Cotton Genotypes due the Mepiquat Chloride

The FMT 701 and Fibermax 966 genotypes of the herbaceous cotton plants showed distinct morphophysiological characteristics due to their unique genetics. Henceforth, they are likely to have differences both in the foliar anatomic characters and in the photosynthetic apparatus due to the application of the mepiquat chloride (MC) growth regulator. The goal of the present work was to assess two genotypes of cotton plants with unique genetic characteristics through the application of increasing doses of MC by means of anatomic analyses of the foliar limb. The experiment was led in field conditions in the region of Cerrado, and experimental delineation employed was the randomized blocks, in a 5 × 2 factorial scheme totaling 10 treatments, with 4 repetitions making up a total of 40 parcels. MC was applied through foliar route, parceled in three applications performed 50, 60 and 70 days after the emergence, and such treatments consisted of the application of fours doses of MC (500; 1,000; 1,500; 2,500 mL ha-1) and a witness. The results obtained from the FMT 701 and Fibermax 966 genotypes suggest that MC exerted distinct influence upon the thicknesses of the adaxial and abaxial epidermises, palisade and lacuna parenchyma and the total thickness of both the internervural region and the region next to the central nervure. The number of adaxial stomata was reduced due to the doses of MC, exerting influence upon the photosynthetic rate in both genotypes.

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Rainfall intensity and Mepiquat Chloride persistence in cotton

Scientia Agricola ◽

10.1590/s0103-90162007000200004 ◽

2007 ◽

Vol 64 (2) ◽

pp. 125-130 ◽

Cited By ~ 8

Author(s):

Fábio Suano de Souza ◽

Ciro Antonio Rosolem

Keyword(s):

Plant Growth ◽

Plant Height ◽

Growth Regulator ◽

Plant Growth Regulator ◽

Dry Matter ◽

Rainfall Intensity ◽

Mepiquat Chloride ◽

Reproductive Structures ◽

Cotton Plants ◽

Dry Matter Weight

In some regions where cotton is grown in Brazil rainfall amounts to about 2,000 mm per year, which imposes a great risk for Mepiquat Chloride (MP) to be washed from cotton leaves before being absorbed. The objective of this research was to evaluate the MC persistence when applied on cotton plants submitted to different rain intensities after spraying. The treatments were three MC rates: 0, 15.0 and 30.0 g a.i. ha-1 and four simulated rainfalls, applied 90 minutes after MC spraying: 5, 10, 20 and 40 mm, plus a treatment without rain. Cotton plants of the cv. Delta Opal were grown in 12 L pots filled with an Haplortox. The experimental design was consisted of complete randomized blocks, in a factorial scheme, with four replicates. The evaluated parameters were: plant height, number of reproductive branches, dry matter weight, reproductive structures, retention and leaf area. The higher the rainfall the lower the effectiveness of the plant growth regulator in controlling plant height. A simulated rainfall as low as 5 mm occurring 90 minutes after MC application was enough to wash some of the plant growth regulator from cotton leaves.

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The Effect of Pyriproxyfen as a “Population Growth Regulator” against Aedes albopictus under Semi-Field Conditions

PLoS ONE ◽

10.1371/journal.pone.0067045 ◽

2013 ◽

Vol 8 (7) ◽

pp. e67045 ◽

Cited By ~ 32

Author(s):

Shin-ya Ohba ◽

Kazunori Ohashi ◽

Endang Pujiyati ◽

Yukiko Higa ◽

Hitoshi Kawada ◽

...

Keyword(s):

Population Growth ◽

Aedes Albopictus ◽

Growth Regulator ◽

Field Conditions

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Effect of Bensulfuron-Methyl on Cotton (Gossypium hirsutumL.) Growth and Development

Weed Technology ◽

10.1017/s0890037x00040914 ◽

1996 ◽

Vol 10 (4) ◽

pp. 851-855

Author(s):

C. Dale Monks ◽

Michael G. Patterson ◽

Malcolm Pegues

Keyword(s):

Methyl Ester ◽

Plant Growth ◽

Plant Height ◽

Growth Regulator ◽

Plant Growth Regulator ◽

Growth And Development ◽

Field Experiments ◽

Mepiquat Chloride ◽

Boll Rot ◽

Effect On Yield

Field experiments were conducted in Alabama from 1992 through 1994 to evaluate the potential of the methyl ester of bensulfuron applied at sublethal rates as a plant growth regulator for reducing plant height and boll rot in cotton. Bensulfuron at 0.017 and 0.034 g ai/ha or mepiquat chloride at 10 g ai/ha was applied POST alone at the pinhead square or early-bloom stage of cotton growth or sequentially at 0.017 followed by (fb) 0.017 g/ha, 0.034 fb 0.034 g/ha of bensulfuron and 5 fb 5, 10 fb 10, 10 fb 20, or 20 fb 20 g/ha of mepiquat chloride. Mepiquat chloride had no effect on yield in 1992 and 1994 but decreased yield when applied sequentially in 1993. Bensulfuron was generally detrimental to first position fruit retention, and it delayed maturity. Treatments that reduced plant height did not reduce boll rot. Bensulfuron treatments that reduced plant height also reduced yield; therefore, the potential for its use as a growth regulator in cotton appears limited.

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Plant Growth Regulator Effects on Flowering of Poa pratensis L. under Field Conditions 1

Agronomy Journal ◽

10.2134/agronj1976.00021962006800020053x ◽

1976 ◽

Vol 68 (2) ◽

pp. 410-413 ◽

Cited By ~ 3

Author(s):

Mark R. Buettner ◽

R. D. Ensign ◽

A. A. Boe

Keyword(s):

Plant Growth ◽

Growth Regulator ◽

Plant Growth Regulator ◽

Poa Pratensis ◽

Field Conditions

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Controlled-release potassium chloride containing mepiquat chloride improved bioavailability of soil potassium and growth of cotton plants

Archives of Agronomy and Soil Science ◽

10.1080/03650340.2020.1817902 ◽

2020 ◽

pp. 1-15

Author(s):

Jianqiu Chen ◽

Xiuyi Yang ◽

Jibiao Geng ◽

Yingjian Wang ◽

Qianjin Liu ◽

...

Keyword(s):

Controlled Release ◽

Potassium Chloride ◽

Mepiquat Chloride ◽

Soil Potassium ◽

Cotton Plants

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Analysis of the effects of the spotted tentiform leafminer (Phyllonorycter blancardella) on the photosynthetic characteristics of apple leaves

Canadian Journal of Botany ◽

10.1139/b82-334 ◽

1982 ◽

Vol 60 (12) ◽

pp. 2734-2740 ◽

Cited By ~ 15

Author(s):

J. T. A. Proctor ◽

J. M. Bodnar ◽

W. J. Blackburn ◽

R. L. Watson

Keyword(s):

Photosynthetic Rate ◽

Dark Respiration ◽

Photochemical Efficiency ◽

Photosynthetic Apparatus ◽

Light Response ◽

Apple Leaves ◽

Economic Thresholds ◽

Fluorescence Reading ◽

Use Efficiency ◽

High Fluorescence

Infestation of apple leaves with the spotted tentiform leafminer (STLM) reduced their net photosynthetic rate (Pn) over a range of light intensities. At a saturating irradiance level of 1240 μE∙m−2∙s−1 and 20 mines per leaf, 32.9% of the leaf area was injured but Pn was decreased by only 23.2%. Examination of parameters in a model for leaf photosynthesis showed a reduction in maximum photosynthetic rate (asymptotic value of the light-response curve) and mesophyll conductance but not in photochemical efficiency or dark respiration. The STLM injury had no effect on transpiration, stomatal conductance, and a slight effect on internal CO2 concentration and water-use efficiency. Mining reduced chlorophyll content of the leaves and this reduced the chlorophyll fluorescence of the mined areas. Tissue around the mines had a relatively high fluorescence reading confirming the Pn measurements and suggesting that this technique was suitable for these and similar studies. Mining by the STLM disrupts the photosynthetic apparatus of the leaf and affects a number of mechanisms in the photosynthetic process. Correlating these effects with field observations will help in determining economic thresholds for this insect.

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