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mepiquat chloride priming confers the ability of cotton seed to tolerate salt by promoting ABA-operated GABA signaling control of the ascorbate–glutathione cycle

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Journal of Cotton Research 2023年第4期6卷 288-305页

作者： QI Qian WANG Ning RUAN Sijia MUHAMMAD Noor ZHANG Hengheng SHI Jianbin DONG Qiang XU Qinghua SONG Meizhen YAN Gentu ZHANG Xiling WANG Xiangru National Key Laboratory of Cotton Bio-Breeding and Integrated Utilization Institute of Cotton Research of Chinese Academy of Agricultural SciencesAnyang 455000HenanChina Institute of Western Agriculture the Chinese Academy of Agricultural sciencesChangji 831100XinjiangChina

Background Ensuring that seeds germinate and emerge normally is a prerequisite for cotton production,*** areas with salinized *** with mepiquat chloride(MC)can promote seed germination and root growth under salt stress,but its mechanism has not been fully *** this study,physiological and biochemical experiments revealed that MC-priming promotes the tolerance of cotton seeds to salt stress by increasing the ability of antioxidant enzymes related to the ascorbate-glutathione(AsA-GSH)cycle to scavenge reactive oxygen species(ROS).Results Results revealed that treatment with inhibitors of abscisic acid(ABA)and γ-aminobutyric acid(GABA)biosynthesis reduced the positive effects of ***,MC-priming increased the contents of ABA and GABA under salt stress by stimulating the expression levels of GhNCED2 and GhGAD4 and the activity of calmodulin-binding(CML)glutamate decarboxylase(GAD).Further analysis showed that an inhibitor of ABA synthesis reduced the positive impacts of MC-priming on the content of GABA under salt stress,but the content of ABA was not affected by the GABA synthesis ***,a multi-omics analysis revealed that MC-priming increased the abundance and phosphorylation levels of the proteins related to ABA signaling,CML,and Ca^(2+)channels/transporters in the MC-primed treatments,which resulted in increased oscillations in Ca^(2+)in the MC-primed cotton seeds under salt *** In summary,these results demonstrate that MC-mediated ABA signaling operates upstream of the GABA synthesis generated by GAD by activating the oscillations of Ca^(2+)and then enhancing activity of the AsA-GSH cycle,which ensures that cotton seeds are tolerant to salt stress.

关键词： Seed priming Salinity stress ABA signaling γ-aminobutyric acid ROS scavenging mepiquat chloride

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Cotton maturity and responses to harvest aids following chemical topping with mepiquat chloride during bloom period

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Journal of Integrative Agriculture 2022年第9期21卷 2577-2587页

作者： QI Hai-kun DU Ming-wei MENG Lu XIE Liu-wei AEgrinya ENEJI XU Dong-yong TIAN Xiao-li LI Zhao-hu Engineering Research Center of Plant Growth Regulator Ministry of Education/College of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193P.R.China Department of Soil Science Faculty of AgricultureForestry and Wildlife Resources ManagementUniversity of CalabarCalabar 540271Nigeria Hebei Cottonseed Engineering Technology Research Center Hejian 062450P.R.China

Early maturity, complete defoliation and boll opening are essential for the efficient machine harvesting of cotton. Chemical topping, involving one extra application of mepiquat chloride(MC) in addition to its traditional multipleapplication strategy, may be able to replace manual topping. However, it is not known whether this chemical topping technique will influence maturity or cotton responses to harvest aids. In this 2-yr field study, we determined the effects of the timing of chemical topping using various rates of MC on boll opening percentage(BOP) before application of harvest aids(50% thidiazuron··ethephon suspension concentrate, referred to as TE), and the defoliation percentage(DP) and BOP 14 days after TE application. The results indicated that late chemical topping(near the physiological cutout, when the nodes above white flower is equal to 5.0) significantly decreased BOP before TE by 5.9–11.2% compared with early(at peak bloom) or middle(seven days after peak bloom) treatments in 2019, which was a relatively normal year based on crop condition. Also, a high MC rate(270 g ha) showed a significantly lower(22.0%) BOP before TE than low(90 g ha) or medium(180 g ha) rates. In 2020, which was characterized by stronger vegetative growth in the late season, the late chemical topping reduced the number of leaves before TE application relative to early or middle treatments, but had lower DP(23.2–27.2%) 14 days after TE application. The high MC rate showed a leaf count before TE application that was similar to the low and medium rates, but it showed the most leaves after TE and much lower(15.0–21.7%) DP in 2020. These results suggest that late timing of chemical topping and a high MC rate decreased the sensitivity of leaves to harvest aids. Further analysis indicated that the late chemical topping mainly affected the leaf drop from the mainstem and fruiting branches where the late regrowth occurred, and the high MC rate reduced leaf shedding from these parts and

关键词： cotton mepiquat chloride thidiazuron ethephon defoliation maturity

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Effects of plant density and mepiquat chloride application on cotton boll setting in wheat–cotton double cropping system

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Journal of Integrative Agriculture 2021年第9期20卷 2372-2381页

作者： CHEN Yuan LIU Zhen-yu HENG Li Leila IMTAMBEL ZHANG Xiang CHEN Yuan CHEN De-hua Jiangsu Key Laboratory of Crops Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Agricultural College Yangzhou University/Jiangsu Co-Innovation Center for Modern Production Technology of Grain CropsYangzhou 225009P.R.China Agricultural Research Cooperation Biotechnology and Biosafety Research CenterKhartoum 999129Sudan

Sowing cotton directly after harvesting wheat in the Yangtze River Valley of China requires early mature of cotton without yield ***-setting period synchronisation and more yield bolls distributed at the upper and middle canopy layers are also required for *** objective of this study is to quantify the individual and interaction effects of plant density and plant growth regulator mepiquat chloride(MC)on temporal and spatial distributions of yield bolls,as well as yield and yield *** the 2013–2016 cotton growing seasons,the experiments were conducted on a shortseason cotton cultivar CRRI50 at Yangzhou University,*** combinations of plant density(12.0,13.5 and 15.0 plants m^(–2))and MC dose(180,270 and 360 g ha^(–1))were applied on cotton *** combination of 13.5 plants m^(–2)and 270 g ha^(–1)MC resulted in the greatest boll number per unit area,the highest daily boll setting number and more than 90%of bolls positioned within 45–80 cm above the *** conclusion,appropriate MC dose in combination of high plant density could synchronize boll-setting period and retain more bolls at the upper and middle canopy layers without yield reduction in the system of direct-seeded cotton after wheat harvest,and thus overcome the labor-intensive problem in current transplanting cropping system.

关键词： direct-seeded cotton after wheat harvest plant density mepiquat chloride yield and yield components boll setting boll spatial distribution

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Effects of mepiquat chloride and plant population density on leaf photosynthesis and carbohydrate metabolism in upland cotton

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Journal of Cotton Research 2023年第4期6卷 250-265页

作者： LUO Haihua ZHANG Zhengxian WU Jianfei WU Zhenjiang WEN Tianwang TANG Feiyu Key Laboratory of Crop Physiology Ecology and Genetic BreedingMinistry of EducationCollege of AgronomyJiangxi Agricultural UniversityNanchang 330045China Jiangxi Institute for Industrial Crops Research Jiujiang 332005China

Background mepiquat chloride(MC)application and plant population density(PPD)increasing are required for modern cotton ***,their interactive effects on leaf physiology and carbohydrate metabolism remain *** study aimed to examine whether and how MC and PPD affect the leaf morpho-physiological characteristics,and thus final cotton *** of three levels(D1:2.25 plants·m^(-2),D2:4.5 plants·m^(-2),and D3:6.75 plants·m^(-2))and MC dosage of two levels(MC0:0 g·ha^(-2),MC1:82.5 g·ha^(-2))were combined to create six *** dynamics of nonstructual carbohydrate concentration,carbon metabolism-related enzyme activity,and photosynthetic attributes in cotton leaves were examined during reproductive growth in 2019 and *** Among six treatments,the high PPD of 6.75 plants·m^(-2)combined with MC application(MC1D3)exhibited the greatest seed cotton yield and biological *** sucrose,hexose,starch,and total nonstructural carbohydrate(TNC)concentrations peaked at the first flowering(FF)stage and then declined to a minimum at the first boll opening(FBO)*** with other treatments,MC1D3 improved starch and TNC concentration by 5.4%~88.4%,7.8%~52.0% in 2019,and by 14.6%~55.9%,13.5%~39.7% in 2020 at the FF stage,***,MC1D3 produced higher transformation rates of starch and TNC from the FF to FBO stages,indicating greater carbon production and utilization ***1D3 displayed the maximal specific leaf weight(SLW)at the FBO stage,and the highest chlorophyll a(Chl a),Chl b,and Chl a+b concentration at the mid-late growth phase in both *** Rubisco activity with MC1D3 was 2.6%~53.2% higher at the flowering and boll setting stages in both years,and 2.4%~52.7% higher at the FBO stage in 2020 than those in other *** results provided a explanation of higher leaf senescence-resistant ability in *** Increasing PPD coupled with MC application improves cotton yield by enhancing leaf car

关键词： Gossypium hirsutum L. mepiquat chloride Plant population density Carbohydrate metabolism Photosynthesis

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Exogenous application of bio-stimulants and growth retardants improve nutrient absorption and fiber quality in upland cotton

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Journal of Cotton Research 2024年第2期7卷 137-147页

作者： Al-Khayri Jameel M. Arif Muhammad Kareem Shadia Hama Salih Anwar Adeel Dehghanisanij Hossein Emami Somayeh Yasmeen Azra Aftab Komal Negm Mohamed Department of Agricultural Biotechnology College of Agriculture and Food SciencesKing Faisal University31982 Al‑AhsaSaudi Arabia Water Resources Zone Irrigation Department PunjabD.G.KhanPakistan Department of Biotechnology and Crop Science College of Agricultural Engineering SciencesUniversity of SulaimaniSulaimaniIraq Department of Agronomy PMAS-Arid Agriculture UniversityRawalpindiPakistan Agricultural Research Education and Extension OrganizationAgricultural Engineering Research InstituteKarajAlborzIran Department of Water Engineering University of TabrizTabrizIran Department of Agronomy Bahauddin Zakariya UniversityMultanPakistan Department of Plant Breeding and Genetics Bahauddin Zakariya UniversityMultanPakistan Agricultural Research Center Cotton Research InstituteGiza 12619Egypt

Background Natural and synthetic plant growth regulators are essential for plant health,likewise these regulators also play a role in increasing organic production productivity and improving quality and yield *** the present study,we have evaluated the effects of foliar applied plant growth regulators,i.e.,moringa leaf extract(MLE)and mepiquat chloride(MC)alone and in combination MC and MLE on the conventional cotton cultivar(CIM 573)and transgenic one(CIM 598).The growth regulators were applied at the start of bloom,45 and 90 days after *** The application of MC and MLE at 90 days after blooming significantly improved the relative growth rate,net assimilation rate,the number of bolls per plant,and seed cotton ***,the combined application of MLE and MC at 90 days after blooming significantly boosted the nitrogen uptake in locules,as well as the phosphorus and potassium uptake in the leaves of both cotton *** application of MLE alone has considerably improved the nitrogen uptake in leaves,and phosphorus and potassium contents in locules of Bt and conventional cotton ***,Bt cotton treated with MLE at 90 days after blooming produced significantly higher ginning out turn and oil *** in combination(MLE+MC)at 90 days after blooming produced considerably higher micronaire value,fiber strength,and staple length in conventional *** The natural growth enhancer,MLE is a rich source of minerals and zeatin,improving the nutrient absorption and quality of cotton fiber in both conventional and Bt cotton cultivars.

关键词： Bio-stimulant Cotton Fiber quality mepiquat chloride Moringa leaf extract Potassium accumulation Oil contents

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Architecture of stem and branch affects yield formation in short season cotton

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Journal of Integrative Agriculture 2020年第3期19卷 680-689页

作者： ZHANG Xiang RUI Qiu-zhi LI Yuan CHEN Yuan CHEN Yuan ZHANG Xi-ling CHEN De-hua SONG Mei-zhen Institute of Cotton Research Chinese Academy of Agricultural Sciences/State Key Laboratory of Cotton BiologyAnyang 455000P.R.China Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops Yangzhou UniversityYangzhou 225009P.R.China

The cotton direct seeding after wheat(rape) harvested is under trial and would be the future direction at the Yangtze River Valley region of *** objective of this study was to quantify the effects of branch and stem architecture on cotton yield and identify the optimal cotton architecture to compensate the yield loss due to the reduction of individual production capacity under high planting density in the direst seeding after wheat harvested cropping *** characteristics of the stem and branch architecture and the relationships between architecture of the stem and branch with yield formation were studied on eight short season cotton cultivars during 2015 and 2016 cotton growth *** on the two years results,three cultivars with different architectures of stem and branch were selected to investigate the effect of mepiquat chloride(MC) application on the architecture of the stem and branch,boll retention,and the yield in *** differences were observed on plant height,all fruiting nodes to branches ratio(NBR) in the cotton plant,and the curvature of the fruiting branch(CFB) among the studied *** were three types of stem and fruiting branch structures: Zhong425 with stable and suitable plant height and NBR(about 90 cm and 2.5,respectively),high CFB(more than 10.0),and high boll retention speed and seed cotton yield;Siyang 822 with excessive plant height and NBR,low CFB,and low boll retention speed and seed cotton yield;and other studied cultivars with unstable structure of stem and branch,boll retention speed,and seed cotton yield across *** MC application could promote the appropriate plant height and NBR and high CFB and thus resulted in high boll retention speed and the *** results suggested that the suitable plant height and NBR(about 90 cm and 2.5 respectively),and high CFB(more than 10.0),which was related to both genotype and cultural practice,could promote the higher boll retention speed and seed cotton yie

关键词： short season cotton architecture of the stem and branch boll retention speed seed cotton yield mepiquat chloride

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