Data/hora: 04/06/2024 13:15:41

Biblioteca(s): | Embrapa Milho e Sorgo.
Data corrente: | 06/02/2019
Data da última atualização: | 07/02/2019
Autoria: | DÍAZ, A. S.; AGUIAR, G. M.; PEREIRA, M. P.; CASTRO, E. M. de; MAGALHAES, P. C.; PEREIRA, F. J.
Afiliação: | Universidade Federal de Lavras; Universidade Federal de Lavras; Universidade Federal de Lavras; Universidade Federal de Lavras; PAULO CESAR MAGALHAES, CNPMS; Universidade Federal de Alfenas.
Título: | Aerenchyma development in different root zones of maize genotypes under water limitation and different phosphorus nutrition.
Ano de publicação: | 2018
Fonte/Imprenta: | Biologia Plantarum, v. 62, n. 3, p. 561-568, 2018.
DOI: | 10.1007/s10535-018-0773-8
Idioma: | Inglês
Conteúdo: | 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.
Thesagro: | Biomassa; Milho; Raiz; Resistência a Seca; Taxa de Crescimento.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/192180/1/Aerenchyma-development.pdf
Registro original: | Embrapa Milho e Sorgo (CNPMS)
Exemplares: | CNPMS - (28705-1) - UPC - AP - DD -  -  -  - DIS