<i>Bacillus subtilis</i> improves maize tolerance to salinity

Ferreira, Nathalia Calhabeu; Mazzuchelli, Rita de Cassia Lima; Pacheco, Ana Claudia; Araujo, Fabio Fernando de; Antunes, Jadson Emanuel Lopes; Araujo, Ademir Sergio Ferreira de

doi:10.1590/0103-8478cr20170910

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CROP PRODUCTION • Cienc. Rural 48 (8) • 2018 • https://doi.org/10.1590/0103-8478cr20170910 copy

Bacillus subtilis improves maize tolerance to salinity

Bacillus subtilis melhora a tolerância do milho a salinidade

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ABSTRACT:

The aim of this study was to evaluate the biochemical responses of maize, under saline stress, inoculated with Bacillus subtilis. Four levels of salinity were assessed: 0mM, 50mM, 100mM, and 200mM of sodium chloride (NaCl). Saline conditions influenced negatively maize growth. However, the inoculation of B. subtilis improved the plant growth at highest level of NaCl. Chlorophyll content decreased while proline increased in inoculated plants submitted to highest salt levels. Also, B. subtilis increased the relative water content in leaves. B. subtilis improves the plant growth under salinity and ameliorates the biochemical damages in maize.

Key words:
Zea mays; PGPB; biochemical responses; enzymes

Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
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[1] E-mail: asfaruaj@yahoo.com.br. ^*Corresponding author

Salinity (NaCl)	B. subtilis	-------------------------------Dry weight (g plant^-1)--------------------------------
		Shoot	Root	Total
0mM	Without	28.2±2.5^b	37.7±4.3^b	65.9±6.7^b
	With	33.4 ±2.6^a	48.2±3.9^a	81.6±7.9^a

50mM	Without	17.2±1.9^a	9.58±1.11^a	26.8±2.7^a
	With	15.5±1.7^a	10.5±1.31^a	26.0±2.4^a

100mM	Without	15.3±2.1^a	9.62±1.33^a	24.9±2.2^a
	With	16.1±2.5^a	7.10±1.24^a	23.2±2.1^a

200mM	Without	2.65±0.98^b	1.83±0.32^a	2.65±0.88^b
	With	6.52±2.40^a	2.60±0.57^a	9.12±2.44^a