Biologia plantarum 62:561-568, 2018 | DOI: 10.1007/s10535-018-0773-8

Aerenchyma development in different root zones of maize genotypes under water limitation and different phosphorus nutrition

A. S. Díaz1, G. M. Aguiar1, M. P. Pereira1, E. Mauro de Castro1, P. C. Magalhães2, F. J. Pereira3,*
1 Departamento de Biologia, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
2 Centro Nacional de Pesquisa de Milho e Sorgo, Sete Lagoas, Minas Gerais, Brazil
3 Instituto de Ciências da Natureza, Universidade Federal de Alfenas, Alfenas, Minas Gerais, Brazil

Root cortical aerenchyma (RCA) is suggested to reduce metabolic cost for root growth, but it might lower water uptake by plants. The objective of this work was to evaluate the effects of drought and phosphorus on the RCA development along the root axis and to elucidate its role in water stress tolerance of two maize genotypes. Plants of drought-tolerant DKB390 and drought-sensitive BRS1010 genotypes were grown in Vermiculite at field capacity of 100, 75, 50, and 25 % and supplied with 0.1, 0.4, and 0.8 mM phosphorus. Growth parameters, RCA, and plant P content were evaluated for all plants. Higher RCA development was observed in DKB390 than in BRS1010. Drought reduced the percentage of RCA in the root-hair zone of both genotypes but increased its development in the root maturation zone. Phosphorus limitation enhanced RCA development only in the DKB390. Under drought stress, DKB390 showed resilient growth whereas growth was inhibited in BRS1010. Higher root P content was related to its higher supply. Therefore, RCA formation was induced either by drought or by phosphorus limitation, while no interaction was evident. The RCA development varied along the root axis in order to balance water and phosphorus uptake and the drought response was genotype dependent.

Keywords: biomass allocation; drought tolerance; relative growth rate; root development
Subjects: aerenchyma development; different root zones; water stress; phosphorus; drought tolerance; maize

Received: October 2, 2016; Revised: November 11, 2017; Accepted: November 14, 2017; Published: September 1, 2018Show citation

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Díaz, A.S., Aguiar, G.M., Pereira, M.P., de Castro, E.M., Magalhães, P.C., & Pereira, F.J. (2018). Aerenchyma development in different root zones of maize genotypes under water limitation and different phosphorus nutrition. Biologia plantarum, 62(3), 561-568. doi: 10.1007/s10535-018-0773-8.
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