ROOT SYSTEM IN MAIZE PLANTS CULTIVATED UNDER WATER DEFICIT AND APPLICATION OF CHITOSAN

LORENA GABRIELA ALMEIDA, EDER MARCOS DA SILVA, PAULO CÉSAR MAGALHÃES, DÉCIO KARAM, CAROLINE OLIVEIRA DOS REIS, CARLOS CÉSAR GOMES JÚNIOR, DANIELE MARIA MARQUES

Resumo


Low water availability is characterized as an abiotic stress
that limits the agricultural production. Due to the physical and chemical
characteristics of the chitosan (CHT), this substance might stimulate
physiological responses on plants to tolerate the water deficit. In this sense,
we submitted corn plants to water deficit and application of chitosan on the
leaves (140 mg/L) during pre flowering stage. It were analyzed two corn
hybrids genotypes contrasting for water deficit tolerance: DKB 390 (tolerant)
and BRS1010 (sensitive). Then, we performed evaluations on the root
system and production components. Corn plants submitted to the application
of chitosan presented a specific behavior: when compared the hybrids,
the tolerant one presented a root system that was more developed and an
expressive agronomical yield. These results highlight the fact that the chitosan
stimulates plant growth, enhancing their root system and contributing to
increase the availability and absorption of water and nutrients. The chitosan
presents a potential to reduce the negative effects of water deficit on the root
systems, without compromising the agronomical yield.


Palavras-chave


Biopolymers, Water deficit, WinRHIZO

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DOI: https://doi.org/10.18512/1980-6477/rbms.v19n1p11