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Acta Agronomica Sinica ›› 2018, Vol. 44 ›› Issue (12): 1837-1843.doi: 10.3724/SP.J.1006.2018.01837

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Morpho-physiological Responses of Cotton Shoot Apex to the Chemical Topping with Fortified Mepiquat Chloride

Jing AN1,Fang LI1,Chun-Jiang ZHOU2,Xiao-Li TIAN1,*(),Zhao-Hu LI1   

  1. 1 College of Agronomy and Biotechnology, China Agricultural University / Engineering Research Center of Plant Growth Regulator, Ministry of Education, Beijing 100193, China
    2 Beijing Plant Protection Station, Beijing 100029, China
  • Received:2018-05-06 Accepted:2018-08-20 Online:2018-12-12 Published:2018-09-19
  • Contact: Xiao-Li TIAN E-mail:tianxl@cau.edu.cn
  • Supported by:
    This study was supported by the China Agricultural Research System(CARS-18-18);the National Natural Science Foundation of China(31571588)

Abstract:

The plant growth regulator mepiquat chloride (1,1-dimethyl piperidinium chloride, DPC) has been successfully and worldwide used in cotton production. Fortified mepiquat chloride is a type of aqueous formulation containing 25% DPC (referred to DPC + hereafter), which can slightly damage young tissues of epidermis. DPC + has shown potential in cotton chemical topping in China, and may replace the conventional manual topping in future. In order to investigate the mechanism of cotton chemical topping with DPC +, this field study was conducted in 2015. DPC + (1125 mL ha -1) was applied after peak blooming stage on 24 July, with water as a control (CK). DPC + application significantly decreased plant height and reduced the nodes above the last white flower (NAWF) as compared with CK. After three days of DPC + treatment, cotton shoot apical meristem (SAM) became flatter than CK, and the ratio of height/length of SAM was significantly less than that of CK. With respect to redox status at shoot apex, O2 -production rate, H2O2 generation and MDA content were significantly increased at six hours after DPC + application. In addition, the expression of GhSPL3 (a SPL transcription factor, which might play an important role in bud differentiation, the transition of growth phase and flower formation), GhV1 (a B3-domain containing transcription factor, which potentially involved in floral initiation), and GhREV3 (a class III homeodomain-leucine zipper transcription factors, which has key roles in meristem and organ development) were down-regulated by DPC + also at six hours after application. In conclusion, DPC + application during later flowering period can implement cotton chemical topping by inducing short-time oxidative stress at cotton apex, down-regulating genes involved in SAM development, flower bud differentiation, and reducing cotton shoot growth.

Key words: cotton, fortified mepiquat chloride, chemical topping, anatomy of shoot apical meristem, redox status, gene expression

Table 1

Primer sequences of qRT-PCR"

基因名称
Gene name
引物序列
Primer Sequences (5'-3')
基因序列来源
Gene source
GhSPL3 F: AAGGAGGGTCCAGTACGGTG; R: CAGCCTTGGCATGGAACTCA GenBank: KJ622311.1
GhV1 F: TGGGTGAGGGAGATGTCTGT; R: GGGCGGCATTTCATTGAGAC GenBank: GU929695
GhREV3 F: TATTCCGGCGCTGCGCTATG; R: TGTTGCTCAAGCTCTTGCCG Cottongen: CotAD_04603
GhACT9 F: GCCTTGGACTATGAGCAGGA; R: AAGAGATGGCTGGAAGAGGA GenBank: AY305737.1

Fig. 1

Effect of chemical topping with DPC+ on cotton plant height Scale bar: 10 cm."

Fig. 2

Effect of chemical topping with DPC+ on plant height (A) and nodes above white flower (NAWF) (B) Error bars represent standard error, n = 3 biological replicates, *P < 0.05, ***P < 0.001."

Fig. 3

Effect of chemical topping with DPC+ on anatomy of cotton shoot apical meristem (SAM) (A), illustration of height and length of cotton SAM (B), and the ratio of height/length of cotton SAM (C) Error bars represent standard error, n = 3 biological replicates, *P<0.05. Scale bar: 100 μm."

Fig. 4

Effect of chemical topping with DPC+ on content of O2- (A), hydrogen peroxide (H2O2) (B), and lipid peroxidation (MDA) (C) in cotton shoot apex Error bars represent standard error, n = 3 biological replicates, *P < 0.05."

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