Título:	Do chitosan and its derivatives have the same protective effect on drought-contrasting maize genotypes? An analysis of physiological and production processes.
Autoria:	REIS, C. O. dos MAGALHAES, P. C. AMBROSIO, A. dos S. ALMEIDA, L. G. CARVALHO, D. T. SOUZA, T. C, de
Afiliação:	CAROLINE OLIVEIRA DOS REIS, Universidade Federal de Lavras; PAULO CESAR MAGALHAES, CNPMS; ALEXANDRA DOS SANTOS AMBRÓSIO, Universidade Federal de Alfenas; LORENA GABRIELA ALMEIDA, Universidade Federal de Lavras; DIOGO TEIXEIRA CARVALHO, Universidade Federal de Alfenas; THIAGO CORREA DE SOUZA, Universidade Federal de Alfenas.
Ano de publicação:	2022
Referência:	Australian Journal of Crop Science, v. 16, n. 2, p. 208-215, 2022.
Conteúdo:	Water stress is among the most severe abiotic stress factors for maize production. The application of chitosan causes various responses in plants, as a function of its structure and concentration. Therefore, chemical modifications were proposed in this study to enhance the biological effects on plants. Hybrid maize plants with drought-contrasting characteristics, were subjected to water deficit and spraying with chitosan (CHI) and semi-synthesized chitosan derivatives, N‑Succinyl (SUC) and N,O‑Dicarboxymethyl (MCA). The obtained data show that the application of CHI and its derivatives (0.5 mg.plant-1 ) led to an increase in production for the two evaluated hybrids in comparison with the control under stress. Regarding leaf gas exchange, over the stress period, it was observed that the application of the MCA derivative yielded greater Pn than the other treatments in plants subjected to drought, in both hybrids. In the evaluation of chlorophyll content, there was an increase in this content through the application of CHI and its derivatives for both maize hybrids under study. With water recovery in plants, the water potential (Ψmd) of those treated with chitosan derivatives was greater than that of the irrigated control plants. In the quantification of proline concentration, higher values were observed in plants treated with MCA derivatives for the drought-sensitive hybrid. Chitosan derivatives, SUC and MCA, were responsible for higher starch concentrations in both maize hybrids. Evaluating the morphological characteristics of roots, the drought-tolerant hybrid showed higher means for all parameters evaluated when subjected to drought, and MCA was responsible for longer root length and greater mean root diameter. The results support the potential use of chitosan and its derivatives to increase tolerance to water deficit in maize.
Thesagro:	Milho Seca
Palavras-chave:	Quitosana
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPMS)