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Cereal Research Communications

, Volume 44, Issue 1, pp 89–97 | Cite as

Root System Traits and Its Relationship with Photosynthesis and Productivity in Four Maize Genotypes under Drought

  • A. O. LavinskyEmail author
  • P. C. Magalhães
  • M. M. Diniz
  • C. C. GomesJr
  • E. M. Castro
  • R. Ávila
Physiology

Abstract

The present study combined evaluations of agronomic parameters such as roots morphometry (using the WinRhizo program) and leaf gas exchange, in order to detect features in the root system which allow the maintenance of photosynthetic rates and productivity in four maize genotypes contrasting for tolerance to water deficit (WD), two tolerant (DKB 390 and BRS1055) and two sensitive (BRS 1010 and 2B710). The genotypes showed similar tolerance to dehydration of leaf tissue, but the tolerant genotypes DKB 390 and BRS1055 presented higher photosynthetic rate and yield compared to the sensitive BRS 1010 and 2B710. Nevertheless, divergent strategies of adaptation to drought among tolerant genotypes were observed. The genotype DKB 390 presented physiological mechanisms in shoots responsible for minimizing water loss, which decreases the dependence of root adjustments to increase the absorption of water. In turn, the BRS 1055 genotype showed a drought avoidance strategy by producing fine roots associated with a higher leaf area.

Keywords

WinRhizo leaf gas exchange photoassimilate root 

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Root System Traits and Its Relationship with Photosynthesis and Productivity in Four Maize Genotypes under Drought

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© Akadémiai Kiadó, Budapest 2016

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • A. O. Lavinsky
    • 1
    Email author
  • P. C. Magalhães
    • 1
  • M. M. Diniz
    • 1
    • 2
  • C. C. GomesJr
    • 1
    • 2
  • E. M. Castro
    • 3
  • R. Ávila
    • 3
  1. 1.Embrapa Milho e SorgoSete LagoasBrazil
  2. 2.Universidade Federal de São João Del ReySete LagoasBrazil
  3. 3.Universidade Federal de LavrasLavrasBrazil

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