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The effect of plant growth regulators on recovery of wheat physiological and yield-related characteristics at booting stage following chilling stress

  • Wenjing Zhang
  • Zhenglai HuangEmail author
  • Kaifang Xu
  • Liang Liu
  • Yulan Zeng
  • Shangyu Ma
  • Yonghui Fan
Original Article
  • 36 Downloads

Abstract

Chilling stress has a strong negative impact on the growth and development of winter wheat (Triticum aestivum L.). To investigate the recovery of physiological function and yield formation by plant growth regulators following chilling stress, we performed low-temperature phytotron experiments at the booting stage, and sprayed 6-benzylamino adenine (6-BA), salicylic acid (SA), brassinolide (BR) and abscisic acid (ABA) after chilling stress. Plant growth regulators significantly enhanced SPAD value and net photosynthetic rate (Pn) in flag leaves following chilling stress (p < 0.05). Compared with the control group sprayed with distilled water, stomatal conductance (Gs) and transpiration rate (Tr) increased, while intercellular carbon dioxide concentration (Ci) decreased. In addition, the concentration of malondialdehyde (MDA) was significantly decreased, and the activities of superoxide dismutase (SOD) and peroxidase (POD) were enhanced (p < 0.05). Plant growth regulators also increased the grain filling rate during the 14 days after anthesis, thereby increasing grain weight. The grain number per spike, 1000-kernel weight, and yield per plant after harvest were also significantly enhanced (p < 0.05). Thus, spraying plant growth regulators at the booting stage relieved the adverse effects on physiological activity in wheat flag leaves caused by chilling stress, and 6-BA and SA were particularly effective.

Keywords

Wheat Plant growth regulator Chilling stress Booting stage Yield 

Abbreviations

ABA

Abscisic acid

6-BA

6-Benzylamino adenine

BR

Brassinolide

CAT

Catalase

Ci

Intercellular CO2 concentration

EBR

24-Epibrassinolide

Gs

Stomatal conductance

JA

Jasmonic acid

MDA

Malondialdehyde

NBT

Nitroblue tetrazolium

Pn

Net photosynthetic

POD

Peroxidase

ROS

Reactive oxygen species

SA

Salicylic acid

SOD

Superoxide dismutase

SPAD

Soil and plant analyzer development

Tr

Transpiration

Notes

Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant no. 2017YFD0300205, 2018YFD0300902), the National Natural Science Foundation of China (Grant no. 31801285), the University Natural Science Research Project of Anhui Province (Grant no. KJ2017A141) and the National College Students’ Innovative Entrepreneurship Training Program (Grant no. 201710364025).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2019

Authors and Affiliations

  1. 1.Department of AgronomyAnhui Agricultural UniversityHefeiPeople’s Republic of China

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