Real-time determination of photosynthesis, transpiration, water-use efficiency and gene expression of two Sorghum bicolor (Moench) genotypes subjected to dry-down

Adriano Marocco, Stefano Amaducci, Alessandra Fracasso, Eugenio Magnanini

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

10 Citazioni (Scopus)

Abstract

Plant growth and productivity are strongly affected by limited water availability in drought prone environments. The current climate change scenario, characterized by long periods without precipitations followed by short but intense rainfall, forces plants to implement different strategies to cope with drought stress. Understanding how plants use water during periods of limited water availability is of primary importance to identify and select the best adapted genotypes to a certain environment. Two sorghum genotypes IS22330 and IS20351, previously characterized as drought tolerant and drought sensitive genotypes, were subjected to progressive drought stress through a dry-down experiment. A whole-canopy multi-chamber system was used to determine the in vivo water use efficiency (WUE). This system records whole-canopy net photosynthetic and transpiration rate of 12 chambers five times per hour allowing the calculation of whole-canopy instantaneous WUE daily trends. Daily net photosynthesis and transpiration rates were coupled with gene expression dynamics of five drought related genes. Under drought stress, the tolerant genotype increased expression level for all the genes analyzed, whilst the opposite trend was highlighted by the drought sensitive genotype. Correlation between gene expression dynamics and gas exchange measurements allowed to identify three genes as valuable candidate to assess drought tolerance in sorghum.
Lingua originaleEnglish
pagine (da-a)1-12
Numero di pagine12
RivistaFrontiers in Plant Science
Volume8
DOI
Stato di pubblicazionePubblicato - 2017

Keywords

  • Drought stress tolerance
  • Gas exchange
  • Gene expression dynamics
  • Plant Science
  • Sorghum bicolor
  • Whole canopy water use efficiency

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