Chilling tolerance in maize: Agronomic and physiological approaches

Muhammad Farooq*, Tariq Aziz, Abdul Wahid, Dong Jin Lee, Kadambot H.M. Siddique

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

120 Citations (Scopus)

Abstract

Maize is a C4 plant species with higher temperature optima than C3 plant species. Growth and productivity of maize are severely constrained by chilling stress. Here, we review the effects of chilling stress on growth, phenology, water and nutrient relations, anatomy, and photosynthesis in maize. Several management strategies to cope with chilling stress are also proposed. In maize, chilling stress is known to reduce leaf size, stem extension and root proliferation, disturb plant water relations, and impede nutrient uptake. Chilling stress in maize is a complex phenomenon with physiological and biochemical responses at both cellular and whole-organ level. CO2 assimilation by leaves is reduced mainly due to membrane damage, photoinhibition, and disturbed activity of various enzymes. Enhanced metabolite flux through the photorespiratory pathway increases the oxidative load on tissues as both processes generate reactive oxygen species (ROS). Injury caused by ROS to macromolecules under chilling stress is one of the major deterrents to growth. Low-molecular-weight osmolytes, including glycinebetaine, proline, and organic acids, are crucial in sustaining cellular function under chilling stress. Plant growth substances such as salicylic acid, gibberellic acid, and abscisic acid modulate the response of maize to chilling stress. Polyamines and several enzymes act as antioxidants and reduce the adverse effects of chilling stress. Chilling tolerance in maize can be managed through the development and selection of chilling-tolerant genotypes by breeding and genomic approaches. Agronomic approaches such as exogenous application of growth hormones and osmoprotectants to seeds or plants, and early vigour, can also aid in chilling tolerance.

Original languageEnglish
Pages (from-to)501-516
Number of pages16
JournalCrop and Pasture Science
Volume60
Issue number6
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Chilling management
  • Chilling response
  • CO2
  • Hormones
  • Osmoprotectants
  • Stomatal oscillation
  • Stress proteins

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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